JP6656556B1 - Systems, programs and detectors - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for informing a user of the existence of a light emitting device which emits light of a specific wavelength. An electronic device detects a speed measuring device that emits pulsed light Lout having a specific wavelength. The electronic device 10 includes a light receiving unit that receives light of a selected wavelength among the incident light, a first light receiving amount when the light receiving unit selects and receives a specific wavelength, and a wavelength at which the light receiving unit is different from the specific wavelength. And a control unit that performs control for notifying the presence of the speed measuring device 30 based on the second received light amount when the selected light is received. [Selection diagram] Fig. 1

Description

  The present invention relates to a system, a program, and the like.

  There are various systems for measuring the speed of a vehicle traveling on a road. In the case of the radar system, a speed measuring device installed along a road emits a microwave in a predetermined frequency band toward a vehicle, receives a reflected wave from the vehicle, and measures a running speed of the vehicle.

  It is sometimes useful for a user such as a driver of a vehicle to be able to grasp the existence of the speed measurement device in advance. Patent Documents 1 and 2 disclose electronic devices that receive microwaves emitted from a vehicle speed measurement device and output an alarm when the presence of the vehicle speed measurement device is detected.

JP 2008-64588 A JP 2017-96828 A

  The measurement of the moving speed of the object can be performed using light. In the case of this optical system, the light emitting device emits light toward an object, receives a reflected wave from the object, and measures the moving speed. Even when such an optical speed measurement device is installed, it is desirable that the user can be notified of the existence thereof. An object of the present invention is to provide a technique for notifying a user of the existence of a light emitting device that emits light of a specific wavelength.

  The purpose of the invention of the present application is not limited to this, and the intention is to acquire rights by divisional application, amendment, etc., even for a configuration aiming to obtain the effect obtained from the configuration disclosed in this specification and the drawings. . For example, in the present specification, a problem in which a part described as “can be” is replaced with “is a problem” is disclosed in the present specification. The tasks are described as being independent of each other, and the intention to acquire rights by divisional application, amendment, etc., alone for the configuration for solving each of the issues is also given. Even if the problem is implied from the description of the specification, the present applicant intends to claim a part of the configuration described in the specification in the amendment or the divisional application. It also discloses a configuration that solves the problem that combines these independent problems, and intends to acquire rights.

(1) A system for detecting a light emitting device that emits light of a specific wavelength, wherein a light receiving unit that receives light of a selected wavelength out of incident light, and the light receiving unit selects and receives the specific wavelength A control unit that performs control to notify the presence of the light emitting device based on the first light receiving amount at the time and the second light receiving amount when the light receiving unit selects and receives light having a wavelength different from the specific wavelength. And a system comprising:

  The light receiving unit may receive not only light intended for light reception but also light other than this light (hereinafter referred to as “disturbance light”). This disturbance light may be erroneously recognized as light intended for light reception. Therefore, simply selecting and receiving light of a specific wavelength may not sufficiently eliminate the influence of disturbance light. A light emitting device emits light having energy concentrated on a specific wavelength, but disturbance light often has energy distributed over a wider wavelength region. Therefore, according to the above-described system, a light emitting device that emits light of a specific wavelength is reduced while reducing the notification that the disturbance light is erroneously recognized as light from the light emitting device as compared with a case where light of a specific wavelength is simply selected and received. The presence can be reported to the user.

  The light emitting device may be a device that emits light in which energy is distributed at least in a wavelength region narrower than disturbance light. The specific wavelength may be a wavelength at which the energy of light emitted from the light emitting device reaches a peak. The specific wavelength may be a wavelength that is not perceived by humans, and for example, may have energy at a specific wavelength outside the visible light region. The specific wavelength belongs to, for example, an infrared light region, and may be 850 nm. The specific wavelength is not limited to this, and may be 950 nm, 1900 nm, or another wavelength. The wavelength different from the specific wavelength may be different from the wavelength at which the energy of light emitted from the light emitting device reaches a peak. The wavelength different from the specific wavelength may be a wavelength included in the visible light region. The first light reception amount may indicate the light amount of a specific wavelength selected and received by the light receiving unit. Selecting a wavelength means selecting some wavelengths from a certain wavelength region and not selecting at least some other wavelengths. The second light receiving amount may indicate a light amount of a wavelength different from the specific wavelength selected and received by the light receiving unit. Although the first light receiving element is used to obtain the first light receiving amount and the second light receiving element is used to obtain the second light receiving amount, there are cases where the single light receiving element is used to obtain the first light receiving amount and the second light receiving amount. You may.

(2) The light emitting device may emit pulse light of the specific wavelength, and the control unit may perform the control to perform the notification in accordance with at least the number of pulses specified based on the first light reception amount. .

  The number of pulses received by the light receiving unit may change depending on the positional relationship between the light receiving unit and the light emitting device. With this configuration, the user can be notified according to the positional relationship between the light receiving unit and the light emitting device.

(3) In the light emitting device, when the light receiving unit is provided in a vehicle, and the control unit stops the notification control according to the number of pulses when another vehicle exists within a predetermined range from the vehicle. It is good to make a system that does it. Stopping the notification control according to the number of pulses may mean not changing the content of the control related to notification according to the number of pulses.

  When there is another vehicle within a predetermined range from the position of the own vehicle, part or all of the light from the light emitting device may be blocked by the other vehicle, and the number of light pulses received by the light receiving unit may decrease. is there. By doing so, it is possible to reduce the notification that is erroneously recognized due to the presence of another vehicle.

(4) a system in which the light emitting device emits the pulse light of the specific wavelength, and wherein the control unit performs the notification control in accordance with at least a pulse width or a pulse interval specified based on the first received light amount. Good to do.

  Referencing the pulse width or pulse interval of the received light may be useful in detecting a light emitting device that emits a specific pulse light. By doing so, it is possible to reduce the notification that the disturbance light is erroneously recognized as the light from the light emitting device.

(5) The control unit may be a system that performs the control for notifying according to the magnitude of the first light reception amount.

  The light receiving amount of the specific wavelength in the light receiving unit increases as the light receiving unit approaches. By doing so, it is possible to reduce the notification that the disturbance light is erroneously recognized as the light from the light emitting device.

(6) When the position information of the current position satisfies a predetermined condition, the control unit may perform the control for notifying.

  With this configuration, the presence of the light emitting device specified based on the current position can be notified without receiving light from the light emitting device.

(7) When the current position is on a predetermined type of road, the control unit may be a system that performs the control for notifying.

  With this configuration, it is possible to notify the presence of the light emitting device on a type of road on which the light emitting device may be present without receiving light from the light emitting device.

(8) The control unit notifies the presence of the light emitting device by a first method according to the first light reception amount and the second light reception amount, and differs from the first method according to the current position. The system may be configured to perform the control to notify the presence of the light emitting device by the method of 2.

  With this configuration, the method of notifying is different depending on whether the presence of the light emitting device is notified based on the amount of received light or based on the current position, so that the user can grasp the event that caused the notification. It will be easier.

(9) a radio wave receiving unit that receives a predetermined radio wave, wherein the control unit notifies the presence of the light emitting device by a first method according to the first light reception amount and the second light reception amount; The system may be configured to perform the control for notifying that the presence of the radio wave generator is notified by a third method different from the first method in response to the reception of the radio wave.

  In this way, the method of notification differs depending on whether the presence of the predetermined radio wave generator is reported or the presence of the radio wave generator is reported, so that the user can grasp the event that caused the report. Easier to do. The predetermined radio wave may be a microwave.

(10) The control unit, after performing the control for notifying, performs control for notifying that an image has been captured or not, depending on whether or not predetermined light has been received by the light receiving unit. It is good to make the system which performs.

  With this configuration, when the presence of the light emitting device is notified, it is possible to further notify the user whether or not the user has been imaged.

(11) The light receiving unit is configured to select and transmit a light of a specific wavelength from the incident light, and to receive the light transmitted by the first wavelength selecting unit, and receive the first light. A first light receiving element that outputs a first signal corresponding to the amount of received light, a second wavelength selection unit that selects light having a wavelength different from the specific wavelength out of the incident light and transmits the light, The system may include a second light receiving element that receives the light transmitted by the selection unit and outputs a second signal according to the second light reception amount.

  With this configuration, the presence of the light emitting device can be notified by the configuration using at least two sets of the wavelength selection unit and the light receiving element.

(12) The system may include a differential amplifier that amplifies a voltage difference between the first signal and the second signal.

  With this configuration, the presence of the light emitting device can be accurately notified based on the difference between the first light reception amount and the second light reception amount.

(13) The system may be a system that houses the light receiving unit and includes a housing having a first window corresponding to the first light receiving element and a second window corresponding to the second light receiving element.

  With this configuration, the presence of the light emitting device can be notified by a configuration using at least two sets of light receiving elements housed in the housing.

(14) The system may be provided with a visible light cut filter provided in the first window and the second window to block visible light. To block the visible light, it is preferable to at least attenuate the visible light.

  With this configuration, since the filters that block visible light are provided in the first window and the second window, it is difficult for a user to visually recognize the wavelength selection unit and the light receiving element housed in the housing.

(15) The first light receiving element and the second light receiving element may be a system without a lens.

  With this configuration, the light receiving angle of the light receiving unit can be increased as compared with the case where the lens is provided.

(16) The housing may be a system having a partition for blocking light between the first light receiving element and the second light receiving element.

  With this configuration, the light transmitted through the first light receiving element is received by the second light receiving element, or the second light receiving element is compared with the case where no partition is provided between the first light receiving element and the second light receiving element. Light transmitted through the element is less likely to be received by the first light receiving element.

(17) The light receiving section may be a system that is shielded with a conductive material.

  In this case, the signal output from the light receiving element is less affected by electromagnetic noise than when the housing is not formed of a conductive material.

(18) The system may include a plurality of light receiving units.

  With this configuration, the presence of the light emitting device can be notified using the plurality of light receiving units.

(19) A system including: a plurality of the light receiving units, the first light receiving unit having the specific wavelength of the first wavelength; and the second light receiving unit having the second wavelength of the specific wavelength different from the first wavelength. Good to do.

  In this way, even when there are a plurality of light emitting devices that emit light of different wavelengths or when the wavelength of light emitted by the light emitting device is changed, the presence of the light emitting device can be notified.

(20) A program for causing a computer to realize the function of the control unit of any of the above systems is provided.

  By doing so, it is possible to reduce the notification that the disturbance light is erroneously recognized as the light from the light emitting device.

  The inventions described in the above (1) to (20) can be arbitrarily combined. For example, a configuration in which at least a part of the configuration of at least one invention after (2) is added to all or a part of the configuration of the invention shown in (1). In particular, the invention described in (1) may be obtained by adding at least a part of the configuration of at least one invention after (2). Further, an arbitrary configuration may be extracted from the inventions described in (1) to (20), and the extracted configurations may be combined. The applicant of the present application intends to acquire rights in the invention including these configurations. Further, even if there is a description such as “in the case of” or “in the case of”, it is not described as a configuration limited to such a case or at that time. These are examples of better configurations, and we have an intention to acquire rights in these and other configurations. In addition, places described with the order are not limited to this order. It also discloses a configuration in which some parts are deleted or the order is changed, and the intent is to acquire rights.

  In the systems of (1) to (20), the presence of the light emitting device is notified based on a third light reception amount when the light receiving unit selects and receives a specific wavelength instead of the second light reception amount. It is good to control. In this case, it is preferable that each of the two or more light receiving elements receives light of the same specific wavelength. With this configuration, the user can be notified of the existence of the light emitting device that emits light of a specific wavelength.

  A light receiving unit that receives the incident light; and a control unit that performs control to notify the presence of the light emitting device based on a pulse width or a pulse interval specified based on the amount of light received by the light receiving unit. A system may be provided. With this configuration, the user can be notified of the existence of the light emitting device that emits light of a specific wavelength.

  According to the present invention, it is possible to notify a user of the existence of a light emitting device that emits light of a specific wavelength.

  The effects of the invention of the present application are not limited to the above, and the effects obtained from the components disclosed in the present specification and the drawings are also disclosed. Have the will to do. For example, in the present specification, the portion described as “can be” is a description that clearly shows the effect to be achieved, and there is a portion that shows the effect even if not described as “can be”. Further, even without such a description, there is an effect that can be grasped by the configuration.

FIG. 2 is a diagram illustrating a configuration of the electronic device according to the first embodiment. It is a figure showing an example of the waveform of the pulse light which the velocity measuring device concerning a 1st embodiment emits. FIG. 2 is a rear view of the electronic device according to the first embodiment. FIG. 2 is a cross-sectional view of the electronic device according to the first embodiment. FIG. 2 is a cross-sectional view of the electronic device according to the first embodiment. FIG. 3 is a diagram illustrating an example of schematic characteristics of a first wavelength selection unit and a second wavelength selection unit according to the first embodiment. FIG. 2 is a block diagram illustrating an electrical configuration of the electronic device according to the first embodiment. 6 is a flowchart illustrating an operation of the electronic device according to the first embodiment. FIG. 4 is a diagram illustrating an example of a display screen of the electronic device according to the first embodiment. FIG. 4 is a diagram illustrating an example of a display screen of the electronic device according to the first embodiment. FIG. 4 is a diagram illustrating an example of a display screen of the electronic device according to the first embodiment. FIG. 4 is a diagram illustrating an example of a display screen of the electronic device according to the first embodiment. 6 is a flowchart illustrating an operation of the electronic device according to the first embodiment. FIG. 4 is a diagram illustrating an example of a display screen of the electronic device according to the first embodiment. FIG. 9 is a diagram illustrating an example of a waveform of pulse light received by an electronic device according to a modification of the first embodiment. FIG. 9 is a diagram illustrating an example of a display screen of an electronic device according to a modification of the first embodiment. FIG. 9 is a diagram illustrating the reason why the number of pulses of pulse light received by the electronic device according to the modification of the first embodiment is reduced. 9 is a flowchart illustrating an operation of the electronic device according to a modification of the first embodiment. It is a figure explaining the outline of the system concerning a 2nd embodiment. 9 is a flowchart illustrating an operation of the electronic device according to the second embodiment. It is a figure showing an example of a display screen of an electronic device concerning a 2nd embodiment. It is a block diagram showing the composition of the system concerning a 3rd embodiment. It is a figure explaining an example of an outline characteristic of the 1st wavelength selection part and the 2nd wavelength selection part concerning a 3rd embodiment. It is a block diagram showing an example of arrangement of a light sensing portion in a system concerning a 3rd embodiment. FIG. 11 is a diagram illustrating a circuit configuration example of a light receiving unit according to a modification. FIG. 6 is a six-view drawing illustrating an example of an external configuration of the electronic device. FIG. 11 is a diagram illustrating an example of characteristics of a first wavelength selection unit and a second wavelength selection unit according to a modification. FIG. 9 is a diagram illustrating a configuration of a light receiving unit according to a modification. FIG. 11 is a diagram illustrating control performed by a control unit according to a modification.

  Hereinafter, embodiments will be described in detail with reference to the drawings. The embodiments described below are examples of embodiments of the present disclosure, and the present disclosure is not limited to these embodiments. In the drawings referred to in the present embodiment, the same portions or portions having the same functions are denoted by the same reference numerals or similar reference numerals (reference numerals in which A, B, etc. are added after numerals). May be omitted. In each of the drawings referred to in the following description, the scale may be different from the actual scale in order to make each member, each region, and the like recognizable. Hereinafter, a case will be described in which the system of the present disclosure is applied to a system that is mounted on a vehicle and that detects a speed measurement device that emits light of a specific wavelength.

[1. First Embodiment]
<1-1. Configuration of First Embodiment>
FIG. 1 is a diagram illustrating a configuration of a system according to the first embodiment. The electronic device 10 is an electronic device to which the system according to the present disclosure is applied. The electronic device 10 is a detector compatible with an optical system and a radar system. The electronic device 10 targets the speed measurement device 30 for detection. The optical system is a system that detects light emitted from the speed measuring device 30. The light emitted from the speed measuring device 30 is pulse light in the present embodiment. More specifically, the light emitted from the speed measuring device 30 is a pulse laser having a constant pulse width. In this case, the optical system can also be called a laser system. The radar system is a system for receiving a predetermined radio wave emitted from a speed measuring device (not shown). The predetermined radio wave is a microwave in the present embodiment.

  The electronic device 10 is an approximately rectangular parallelepiped monitor-type device. The electronic device 10 is installed inside a vehicle 40. The electronic device 10 is installed on the dashboard 41 using, for example, a double-sided tape. The housing of the electronic device 10 is a housing 100. An opening is provided on the front surface of the housing 100. The electronic device 10 has a display unit 13 for displaying an image at the position of the opening. The housing 100 is formed of a resin or another material.

  The speed measuring device 30 is installed at a speed control point of the vehicle. The speed measuring device 30 may be, for example, either a fixed type or a mobile type, but may be a mobile type. The mobile type includes, for example, a portable type and a type mounted on a vehicle. In the case of the mobile type, the electronic device 10 can detect the speed measuring device 30 by an optical method even if the position information of the speed control point is not known. In the example of FIG. 1, the speed measurement device 30 is installed on a sidewalk adjacent to a roadway, and measures the speed of a vehicle traveling on the roadway. The speed measuring device 30 measures a distance to a vehicle within a predetermined distance (for example, 70 m), and further measures a speed of the vehicle at a predetermined distance (for example, 20 m) closer to the own device.

  The speed measurement device 30 includes a speed measurement unit 31, an imaging unit 32, and a strobe 33. The speed measuring unit 31 measures the speed of the vehicle by a laser scan method. Specifically, when the pulse light Lout reaches the vehicle 40 and is reflected, the speed measuring unit 31 receives the reflected light Lref. The speed measuring unit 31 measures the distance to the vehicle 40 based on the time required from when the pulse light Lout is emitted to when the reflected light Lref is received. The measurement is repeated, and the speed of the vehicle 40 is measured based on the moving distance of the vehicle 40 per unit time.

  The speed measuring unit 31 emits the pulse light Lout while changing the direction within a sector T having a central angle of the angle θ. θ is, for example, 110 degrees. The range T includes a range on the upstream side in the traveling direction of the vehicle 40 wider than the position on the speed measurement device 30 than the range on the downstream side. The speed measuring unit 31 changes the emission direction of the pulse light Lout in the counterclockwise direction. For example, after emitting the pulse light Lout in the direction of the arrow D1, the speed measuring unit 31 emits the pulse light Lout in the direction of the arrow D2. The emission direction of the pulse light Lout is, for example, substantially horizontal. The speed measuring unit 31 emits pulse light to a mirror that rotates at a constant speed, for example. The pulse light reflected by the mirror and emitted from the light emitting window is the pulse light Lout.

  The pulse light Lout has energy concentrated on a specific wavelength. The specific wavelength may be a wavelength at which the energy of light emitted from the light emitting device reaches a peak. The pulse light Lout desirably has energy at a specific wavelength outside the visible light region, for example. The specific wavelength may be a wavelength that is not perceived by humans, and for example, may have energy at a specific wavelength outside the visible light region. The specific wavelength belongs to, for example, an infrared light region and is 850 nm. However, the specific wavelength is not limited to this, and may be 950 nm, 1900 nm, or another wavelength.

  FIG. 2 is a diagram illustrating an example of a waveform of the pulse light Lout emitted from the speed measuring device 30. The pulse light Lout is a rectangular wave here. However, the pulse light Lout may be a sine wave, a triangular wave, a sawtooth wave, or another waveform. The pulse light Lout is light in which a period T1 and a period T2 appear alternately. The period T1 is a period during which the pulse light of the specific wavelength λout is emitted. In the period T1, the pulse light Lout alternates between a high level (H) and a low level (L). The period T2 is a period during which light having this pulse waveform is not emitted. As described above, the speed measuring device 30 emits the pulse light to the mirror rotating at a constant speed, and emits the pulse light Lout reflected by the mirror. Therefore, a period during which the pulse light from the mirror is not directed toward the light emitting window of the speed measuring device 30 is a period T2.

  The imaging unit 32 captures an image of the target vehicle when the speed measured by the speed measurement unit 31 is equal to or higher than the threshold. The imaging unit 32 is used to capture an image of a vehicle that has violated the speed. The strobe 33 emits light when the image is captured by the imaging unit 32. The image capturing section 32 may capture an image based on light in an infrared light region so that an image can be captured even at night. In this case, the strobe 33 preferably emits light having energy in the infrared light region. The speed measurement device 30 transmits data such as a measured speed and a captured image to an external computer.

  FIG. 3 is a rear view of the electronic device 10. As shown in FIG. 3, a first window 101 and a second window 102 are formed on the rear surface of the housing 100. The first window 101 and the second window 102 are openings for guiding external light to the inside of the housing 100. The first window 101 and the second window 102 are arranged at a predetermined interval in the left-right direction. The first window 101 and the second window 102 are, for example, rectangular, but may have other shapes. The light receiving unit 12 is provided inside the housing 100. The light receiving unit 12 receives light that has entered through the first window 101 and the second window 102.

  4 and 5 are cross-sectional views of the electronic device 10. FIG. FIG. 4A is a cross-sectional view (II cross-sectional view of FIG. 3) when the electronic device 10 is cut along the vertical direction at a position including the first window 101. FIG. 4B is a cross-sectional view (a cross-sectional view taken along the line II-II of FIG. 3) when the electronic device 10 is cut along a vertical direction at a position including the second window 102. FIG. 5 is a cross-sectional view (a cross-sectional view taken along the line III-III of FIG. 3) when the electronic device 10 is cut along the left-right direction at a position including the first window 101 and the second window 102. 6 is a graph illustrating an example of a schematic characteristic of a wavelength selection unit, which will be described later, of the light receiving unit 12. In FIG. 6, the horizontal axis corresponds to the wavelength, and the vertical axis corresponds to the transmittance.

  As shown in FIGS. 4A and 4B, the first window 101 is provided with a visible light cut filter 126. A visible light cut filter 127 is provided in the second window 102. The visible light cut filters 126 and 127 block at least a part of the visible light. The visible light cut filters 126 and 127 transmit light having a specific wavelength λout. To block the visible light, it is preferable to at least attenuate the visible light. The visible light region is, for example, 400 to 700 nm. The presence of the visible light cut filters 126 and 127 makes it difficult for components housed inside the housing 100 to be visually recognized from the outside. In addition, the presence of the visible light cut filters 126 and 127 can reduce adverse effects caused by the light receiving unit 12 receiving strong visible light such as direct sunlight.

  As shown in FIG. 4A, a first wavelength selection unit 121 and a first light receiving element 122 are provided facing the first window 101. The first wavelength selection unit 121 selects and transmits light having the specific wavelength λout from the incident light. Selecting a wavelength may mean selecting some wavelengths from a certain wavelength region and not selecting at least some other wavelengths. The first wavelength selector 121 is, here, a band-pass filter. As shown by the solid line in FIG. 6, light in a wavelength region including the specific wavelength λout, here, light in a wavelength region from the wavelength λ1a to λ1b is transmitted, and light in other wavelength regions is blocked. Blocking light means at least attenuating the light, and the amount of attenuation is greater at a wavelength that blocks light than at a wavelength that transmits light. The characteristics of the first wavelength selection unit 121 are determined from the viewpoint of transmitting only light having the same wavelength as the pulse light from the speed measurement device 30 as much as possible. The width of the wavelength region from the wavelength λ1a to the wavelength λ1b is, for example, 20 nm, but is more preferably narrower.

  In FIG. 6, the transmittance in a frequency region where light is transmitted is represented as 100%, and the frequency region in which light is blocked is represented as approximately 0%. Although it is desirable that the wavelength selector has a steep characteristic as illustrated in FIG. 6, it may have a broader characteristic. For example, there may be a wavelength in which the transmittance of each of the first wavelength selector 121 and the second wavelength selector 123 is not 0%.

  The first light receiving element 122 receives the light transmitted by the first wavelength selection unit 121, and outputs a first signal corresponding to the first received light amount, which is the amount of received light. The first light receiving element 122 is preferably, for example, a photodiode, but may be a phototransistor or another light receiving element. The first light receiving element 122 has sensitivity at least in an infrared light region. The first light receiving element 122 includes, for example, a resin mold that transmits infrared light. It is preferable that the first light receiving element 122 does not receive light in a wavelength region of 700 nm or less. The first light receiving element 122 is a so-called lensless type light receiving element having no lens. Accordingly, the light receiving angle of the first light receiving element 122 is increased (for example, 120 to 180 degrees), and light in multiple directions can be received. Instead, the angle of acceptance of the light of the first light receiving element 122 may be widened by combining lenses and mirrors.

  As shown in FIG. 4B, a second wavelength selection unit 123 and a second light receiving element 124 are provided facing the second window 102. The second wavelength selection unit 123 is a filter that selects and transmits light in a wavelength region different from the specific wavelength λout from the incident light. The wavelength different from the specific wavelength may be different from the wavelength at which the energy of light emitted from the light emitting device reaches a peak. The wavelength different from the specific wavelength may be a wavelength included in the visible light region. The second wavelength selection unit 123 is, for example, a band elimination filter. As shown by the broken line in FIG. 6, the second wavelength selector 123 blocks light in a wavelength region including the specific wavelength λout, here, light in the wavelength region from the wavelength λ2a to wavelength λ2b, and emits light in the other wavelength regions. Through. It is desirable that the wavelength region from the wavelength λ2a to the wavelength λ2b does not include the specific wavelength λout, but includes a wavelength region other than the specific wavelength λout as widely as possible. The characteristics of the second wavelength selection unit 123 are determined from the viewpoint that only light having a wavelength different from the pulse light Lout from the speed measurement device 30 is transmitted as much as possible.

  The second light receiving element 124 receives the light that has passed through the second wavelength selection unit 123, and outputs a second signal corresponding to the second received light amount, which is the amount of received light. The second light receiving element 124 is, for example, a photodiode, but may be a phototransistor or another light receiving element. The second light receiving element 124 preferably has the same characteristics as the first light receiving element 122, for example, the same product (for example, model number). This is because when the second light receiving element 124 and the first light receiving element 122 receive the same light, the first signal Sig1 and the second signal Sig2 become the same signal. Like the first light receiving element 122, the second light receiving element 124 is a sensor without a lens, that is, a sensor without a lens.

  As shown in FIG. 5, the housing 100 includes a partition 103 that blocks light between the first light receiving element 122 and the second light receiving element 124. It is desirable that the distance between the first light receiving element 122 and the second light receiving element 124 be as small as possible. This is to prevent a shift in light incidence timing between the first light receiving element 122 and the second light receiving element 124. Even in this case, the light transmitted through the first wavelength selection unit 121 is received by the second light receiving element 124 and the light transmitted through the second wavelength selection unit 123 is transmitted to the first light receiving element 122 Is less likely to be received.

  It is preferable that the light receiving unit 12 is shielded using a conductive material. This shield is formed of, for example, a metal case. Thereby, the influence of electromagnetic noise on the electronic components in the housing 100 is reduced.

  The first window 101, the second window 102, and the light receiving unit 12, when the display unit 13 of the electronic device 10 is turned to the driver's seat of the vehicle 40, is obliquely forward (for example, left front) with respect to the traveling direction of the vehicle 40. May be provided. Thereby, the light receiving unit 12 may easily receive the pulse light Lout from the speed measuring device 30.

  FIG. 7 is a block diagram illustrating an electrical configuration of the electronic device 10. The control unit 11 controls each unit of the electronic device 10. The control unit 11 is, for example, a computer including an arithmetic processing circuit and a memory. The arithmetic processing circuit includes, for example, a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or another arithmetic processing circuit. The memory includes, for example, a RAM (Random Access Memory) or other volatile memory. The arithmetic processing circuit performs various controls by temporarily reading data into a memory and performing arithmetic processing.

  The light receiving section 12 includes a first wavelength selecting section 121, a first light receiving element 122, a second wavelength selecting section 123, a second light receiving element 124, and an interface 125. The first wavelength selection unit 121 selects, for example, a wavelength region from the wavelength λ1a to the wavelength λ1b from the incident light and transmits the light as the light Lin1. The first light receiving element 122 receives the light Lin1, and outputs a first signal Sig1 corresponding to the first received light amount. The first light reception amount may indicate a light amount of a specific wavelength selected and received by the light receiving unit 12. The first signal Sig1 indicates the amount of light Lin1 received. The second wavelength selection unit 123 selects a wavelength region different from the wavelength region from the wavelength λ2a to the wavelength λ2b and transmits the selected wavelength region as the light Lin2. The second light receiving element 124 receives the light Lin2 and outputs a second signal Sig2 according to the second light reception amount. The second received light amount may indicate a light amount of a wavelength different from the specific wavelength selected and received by the light receiving unit 12. The second signal Sig2 indicates the amount of light Lin2 received. The interface 125 processes the first signal Sig1 and the second signal Sig2, and outputs the processed signal to the control unit 11. The interface 125 converts, for example, the first signal Sig1 and the second signal Sig2 into a digital format and outputs the digital format.

  The display unit 13 displays an image. The display unit 13 is, for example, a 3.2-inch color TFT liquid crystal display. However, the display unit 13 may be an organic EL display or another type of display device. The speaker 14 outputs sound. Microwave receiving section 15 includes an antenna and a receiving circuit, and receives microwaves. The GPS (Global Positioning System) receiving unit 16 includes an antenna and a receiving circuit, and receives a signal from a GPS satellite. The GPS receiver 16 processes the received signal and outputs position information. The position information includes, for example, latitude information and longitude information, and may further include altitude information. The communication unit 17 communicates with an external device. The communication unit 17 performs wireless communication of, for example, Wi-Fi (registered trademark), Bluetooth (registered trademark), or another method.

  The storage unit 18 stores data. The storage unit 18 stores, for example, a program for the control unit 11 to perform various controls. The control unit 11 reads a program from the storage unit 18 to a memory and executes the program. The storage unit 18 also stores map data indicating a map, data indicating types of various facilities and their locations, data for notifying the presence of a notification target, data for implementing a route guidance function, and the like. The notification target is, for example, a drowsy driving accident point, a speed measurement device (radar system, loop coil system, H system, LH system, photoelectric tube system, mobile system, etc.), speed limit switching point, enforcement area, check area, ban Monitoring area, N system, traffic monitoring system, intersection monitoring point, signal ignoring deterrence system, police station, accident-prone area, on-vehicle frequent occurrence area, steep / continuous curve (highway), branching / merging point (highway), ETC lane advance guidance (highway), service area (highway), parking area (highway), highway oasis (highway), smart interchange (highway), PA / SA gas station (highway), tunnel ( Expressway), highway radio reception area (expressway), prefectural border announcement, roadside station, viewpoint parking, etc. is there. The storage unit 18 stores the type information of the notification target object, position information indicating the position, data of an image (for example, a schematic diagram or a photograph) displayed on the display unit 13, and audio data in association with each other. I do.

  The storage unit 18 may include a storage medium that stores data permanently. The storage unit 18 may include, for example, an optical recording medium, a magnetic recording medium, a semiconductor recording medium, or another recording medium.

  The operation unit 19 receives a user operation. The operation unit 19 includes, for example, a touch sensor, a volume adjustment button, and a work button. The touch sensor is provided on the surface of the display unit 13 and detects a position touched by the user. The volume operation button is operated to adjust the volume of the sound output from the speaker 14. The operation buttons are buttons for performing various operations.

  The sensor unit 20 includes various sensors. The sensor unit 20 includes, for example, a geomagnetic sensor, an acceleration sensor, and an illuminance sensor. The terrestrial magnetism sensor is a sensor that detects terrestrial magnetism to detect which direction the north direction is with respect to the traveling direction. The acceleration sensor is a sensor that detects front-rear, left-right, up-down acceleration of the vehicle. The illuminance sensor is a sensor that detects illuminance indicating the brightness of the vehicle interior.

  The mounting section 21 is a mounting section to which an external storage medium is mounted. The external storage medium is, for example, a memory card. In this case, the mounting section 21 is a memory card slot. The data stored in the storage unit 18 may be imported via an external storage medium. As this data, there is update information of information (position information such as longitude and latitude, type information, etc.) of a new notification target (target).

  The power supply unit 22 supplies power supplied from a power supply to each unit in the electronic device 10. The power supply unit 22 includes, for example, a power switch and a DC jack. The DC jack is for connecting a cigar plug cord, and is connected to a cigar socket of the vehicle via the cigar plug cord to receive power supply. The power switch is a switch for turning on or off the power of the electronic device 10.

  The light emitting section 23 emits light in various colors. The light emitting unit 23 includes, for example, a light emitting diode.

  The cable terminal 24 is a terminal to which an external connection cable is connected. For example, the connection cable is a cable that connects the electronic device 10 to an OBD-II connector mounted on a vehicle. The OBD-II connector is also called a failure diagnosis connector, and is connected to the ECU of the vehicle to output various types of vehicle information.

  The electronic device 10 may have a function provided in a known radar detector in addition to the above.

<1-2. Operation of First Embodiment>
Next, the operation of the present embodiment will be described.
<1-2-1. Notification by optical method>
FIG. 8 is a flowchart illustrating an operation of the control unit 11 of the electronic device 10. FIG. 8 shows an operation when the speed measurement device 30 is detected by an optical method. When the electronic device 10 starts operating, the control unit 11 executes a process described below. The timing of the start of the operation of the electronic device 10 is not particularly limited. For example, the timing may be that the power of the electronic device 10 is turned on or that the execution of the route guidance function is started.

  The control unit 11 first starts displaying a map screen on the display unit 13 (step S1). The map screen is a screen showing the position of the vehicle on the map. The map displayed on the display unit 13 is specified based on the map data and the position information from the GPS receiving unit 16. The own vehicle position is specified based on position information from the GPS receiving unit 16. FIG. 9 is a diagram illustrating an example of the map screen. In the map screen shown in FIG. 9, an icon I1 indicating the position of the own vehicle is arranged on the map M. The map screen displays an address at the current position, a distance to a predetermined notification target (here, "1960 m to the H system"), a speed limit, and a photograph around the speed control point. FIG. 10 is a diagram showing another example of the map screen. On the map screen shown in FIG. 10, an icon I <b> 1 indicating the own vehicle position is arranged on the map M. Hereinafter, an example of control when the map screen shown in FIG. 10 is displayed will be described. Note that the icons of the present embodiment may be replaced with characters, symbols, figures, and other objects.

  Next, the control unit 11 acquires the first signal Sig1 and the second signal Sig2 from the light receiving unit 12 (Step S2). Next, the control unit 11 calculates a difference between the first light reception amount according to the first signal Sig1 and the second light reception amount according to the second signal Sig2 (step S3). Next, the control unit 11 determines whether the calculated difference is equal to or greater than a threshold (Step S4). When the difference is smaller than the threshold, the control unit 11 determines “NO” in step S4 and returns to the process of step S2. In this case, the control unit 11 determines that the speed measuring device 30 has not been detected, and does not notify that the speed measuring device 30 exists.

  On the other hand, when the calculated difference is equal to or larger than the threshold, the control unit 11 determines “YES” in step S4 and performs the notification control (step S5). The notification control is control for notifying the presence of the speed measurement device 30. The notification control can be said to be a control for issuing an alarm for causing the user to recognize what the speed measurement device does. Here, the notification control is control for notifying the user of the presence of the speed measurement device 30 by the first method. The notification control includes, for example, control for displaying a notification screen on the display unit 13.

  FIG. 11 is a diagram illustrating an example of the notification screen. The notification screen illustrated in FIG. 11 is a screen in which the window W1 is arranged so as to overlap the above-described map screen. In the window W1, an icon M1 indicating the presence of the speed measuring device 30 and a message indicating that the speed measuring device 30 is approaching. Be careful. The icon M1 is an icon that allows the user to recognize that the speed measurement device 30 is compatible with the optical system. The notification control may include a control of outputting a notification sound from the speaker 14. In this case, the control unit 11 may output a voice from the speaker 14 saying, "You are approaching the speed control point by the laser. Be careful." The notification control may include control other than these, and may include, for example, control for causing the light emitting unit 23 to emit light. The notification control may be any control that notifies the presence of the speed measurement device 30 by a method that allows the user to recognize the speed measurement device 30.

  Next, the control unit 11 determines whether to end the processing in FIG. 8 (Step S6). There is no particular limitation on the end of the process. For example, the end of the process may be triggered by turning off the power of the electronic device 10 by operating the operation unit 19 or stopping the route guidance function. When determining “NO” in the step S6, the control unit 11 returns to the process of the step S2 and repeats the above process. (Step S4). For example, when the difference changes from the threshold value to the threshold value, the control unit 11 determines “NO” in step S4 and stops the notification control. In this case, the control unit 11 causes the display unit 13 to display the map screen shown in FIG. This means that the vehicle passed the speed control point. If “YES” is determined in the step S6, the control unit 11 ends the processing in FIG. 8 (step S7).

  Here, the reason why the speed measurement device 30 can be detected by the above-described method will be described. As described with reference to FIG. 6, the first wavelength selection unit 121 selects light having a specific wavelength λout (more specifically, a wavelength region from the wavelength λ1a to the wavelength λ1b) in which the pulsed light Lout has energy, Let through. Therefore, the first signal Sig1 should show a large amount of received light during the period when the pulsed light Lout is being received, and show a small amount of received light during the other periods. However, the light receiving unit 12 may receive not only the pulse light Lout intended for light reception but also disturbance light. This disturbance light may be mistaken for pulse light. As the disturbance light, for example, there is light that arrives as sunlight is periodically interrupted by the branches and leaves of a tree shaken by the wind. Other types of disturbance light include light that periodically turns on and off from a traffic light, an advertisement, and the like, and light from a rotation warning light that rotates at a constant speed. Also, the light received by the light receiving unit changes due to the vibration of the light receiving unit. For example, when the vehicle 40 travels in a place where periodic vibrations are generated, such as on a pier, the direction of the light receiving unit 12 (for example, the first light receiving element 122) changes, and light such as sunlight is In some cases, the light is received as light that is repeatedly turned on and off periodically. Also in such a case, the first signal Sig1 indicates a relatively large amount of received light.

  On the other hand, the second wavelength selection unit 123 blocks the light of the specific wavelength λout (in this embodiment, the wavelength region from the wavelength λ2a to the wavelength λ2b) in which the pulse light Lout has energy, and blocks the light of the other wavelength region. Transmit light. Therefore, the amount of the second signal Sig2 received is small during the period in which the pulse light Lout is received. The second light receiving element 124 receives the disturbance light, and such disturbance light generally has a wide wavelength region in which energy is distributed. Therefore, even when the light receiving unit 12 receives disturbance light that is repeatedly turned on and off periodically, the amount of light received by the second light receiving element 124 is considered to be large. For this reason, when the light reception amount of the first signal Sig1 is large and the light reception amount of the second signal Sig2 is small, that is, when the difference between the light reception amounts is equal to or larger than the threshold, it can be estimated that the pulse light Lout has been received. On the other hand, if the amount of received light of the first signal Sig1 is large and the amount of received light of the second signal Sig2 is large, that is, if the difference between the amounts of received light is less than the threshold, it is unlikely that the pulse light Lout has been received. Can be estimated. Therefore, according to the electronic device 10, by using the first light receiving element 122 and the second light receiving element 124 to receive light, it is expected that the detection accuracy of the speed measuring device 30 is improved.

<1-2-2. Radar notification>
The control unit 11 may further execute the processing in FIG. 13 in parallel with the processing in FIG. 8 based on the microwave received by the microwave receiving unit 15.

  First, the control unit 11 acquires a microwave reception signal from the microwave reception unit 15 (Step S11). Next, the control unit 11 performs a determination process of determining the presence or absence of a radar type speed measurement device based on the received microwave signal (step S12). In step S12, the control unit 11 may determine whether or not a speed control point exists based on the received microwave frequency band. The algorithm for this determination may be, for example, the method described in Patent Document 1 or 2, and description thereof will be omitted.

  Next, the control unit 11 determines whether or not the speed measurement device has been detected based on the result of the determination process (Step S13). When determining “YES” in Step S13, the control unit 11 performs notification control (Step S14). Here, the notification control is control for notifying the user of the presence of the speed measurement device by the third method. The notification control includes, for example, control for displaying a notification screen on the display unit 13. FIG. 14 is a diagram illustrating an example of the notification screen. The notification screen shown in FIG. 14 is a screen in which the window W2 is arranged on the map screen described above. In the window W2, an icon M2 indicating the presence of the speed measurement device 30 and a message indicating that the speed measurement device 30 is approaching. Please be careful. The icon M2 is an icon that allows the user to recognize that the speed control device is compatible with the radar system. That is, the icon M2 is different from the icon M1. The notification control may include a control of outputting a notification sound from the speaker 14. In this case, the control unit 11 may output a voice from the speaker 14 saying, "You are approaching the speed control point by radar. Please be careful." The information control information may be control other than these, and may include, for example, control for causing the light emitting unit 23 to emit light. Also in this case, the notification control may be any control that notifies the presence of the speed measurement device by a method that allows the user to recognize the speed measurement device.

<1-3. Modification of First Embodiment>
The control unit 11 may further perform the following control.
<1-3-1. Notification according to the number of pulses>
When the speed measuring device 30 emits light having a pulse waveform, referring to the number of pulses is also useful for detecting the speed measuring device 30. FIG. 15 is a diagram illustrating an example of a waveform of the pulse light Lout received by the electronic device 10. FIG. 15A shows a case where the distance between the electronic device 10 and the speed measuring device 30 is relatively large, and FIG. 15B shows a case where the distance between the electronic device 10 and the speed measuring device 30 is relatively small. As shown in FIG. 15A, when the distance between the speed measurement device 30 and the electronic device 10 is relatively large, the pulse light Lout traveling in the direction of the electronic device 10 can be received, but the speed measurement device 30 on the road is Pulse light in a direction propagating only at a close position (for example, right beside the speed measuring device 30) is not received. Therefore, the light receiving period Rx1 of the pulse light Lout is relatively shorter than the non-light receiving period Rx2. As shown in FIG. 15B, when the distance between the speed measurement device 30 and the electronic device 10 is relatively small, the pulse light Lout traveling in the direction of the electronic device 10 can be received, and the speed measurement device 30 of the road can be received. Can also receive pulsed light in a direction propagating only at a position close to. Therefore, the light receiving period Rx1 of the pulse light Lout is relatively longer than the non-light receiving period Rx2. Immediately after the vehicle 40 has passed the position of the speed measurement device 30, the number of pulses is considered to decrease.

  Therefore, the control unit 11 may perform notification control according to the number of pulses. For example, the control unit 11 may change the notification level according to the number of pulses included in the reception period of the pulse light. The notification level is an index indicating how important the content of the notification is to the user, and may be referred to as an alarm level in the present embodiment. The control unit 11 specifies the number of pulses based on at least the amount of light received by the first light receiving element 122. For example, the control unit 11 increases the notification level during a period in which the number of pulses is equal to or larger than the threshold value or a period in which the number of pulses is increasing, because the control unit 11 is approaching the speed measurement device 30. The control unit 11 lowers the notification level during a period in which the number of pulses is less than the threshold value or a period in which the number of pulse widths is decreasing, because the distance is far or away from the speed measurement device 30. The control unit 11 changes the notification method according to the notification level. The control unit 11 may change the message displayed on the display unit 13, change the notification sound output from the speaker 14, or change the emission color of the light emitting unit 23, for example, according to the notification level.

  In addition, the control unit 11 may estimate the distance from the number of pulse widths, and notify according to the distance. For example, as shown in FIG. 16, the control unit 11 may estimate the position of the speed measuring device 30 from the number of pulse widths and display the position on the map. In this example, the icon P indicates the position of the speed measurement device 30. As described above, the control unit 11 can notify the user according to the positional relationship between the light receiving unit 12 and the speed measurement device 30.

  By the way, as shown in FIG. 17, when another vehicle is present in front of the vehicle 40, there is a possibility that all or part of the pulse light Lout may be obstructed by the vehicle C traveling ahead. In this case, even if the number of pulses is referred to, the positional relationship may not be accurately specified. Therefore, the control unit 11 detects the presence or absence of another vehicle C in a predetermined range from the vehicle 40, here, in front of the vehicle 40. The control unit 11 may perform notification control according to the number of pulses when another vehicle C does not exist, and stop the notification control when the vehicle C exists. Stopping the notification control according to the number of pulses may mean not changing the content of the control related to notification according to the number of pulses. In addition, the electronic device 10 may stop the notification control according to the number of pulses when the inter-vehicle distance is less than the threshold, and may perform the notification control when the inter-vehicle distance is not less than the threshold. The method of detecting the vehicle C is not particularly limited, but there is a method using the on-vehicle camera 50. The on-vehicle camera 50 is, for example, a camera used in a drive recorder, and captures an image in front of the vehicle 40 here.

  FIG. 18 is a flowchart illustrating the operation of the control unit 11 of the electronic device 10 in this case. The control unit 11 acquires a captured image from the in-vehicle camera 50 via the communication unit 17 (Step S21). Next, the control unit 11 analyzes the captured image (Step S22). Although the algorithm for analyzing the captured image is not limited, there is, for example, a pattern matching method. And the control part 11 determines whether there is a vehicle ahead (step S23). If “NO” is determined in step S23, the control unit 11 determines to perform the notification control according to the number of pulses (step S24). In this case, the control unit 11 performs processing such as rewriting the flag to a value for performing control according to the number of pulses. If “YES” is determined in step S23, the control unit 11 determines to stop the notification control according to the number of pulses (step S25). In this case, the control unit 11 performs processing such as rewriting a predetermined flag to a value indicating that control according to the number of pulses is not performed. Here, the vehicle in front of the vehicle 40 is detected, but may be behind the vehicle 40 or the like. In addition, the electronic device 10 may include the in-vehicle camera 50. As described above, the possibility of misidentifying the positional relationship between the light receiving unit 12 and the speed measurement device 30 due to the presence of another vehicle C is reduced.

<1-3-2. Control according to pulse width or pulse interval>
When the speed measuring device 30 emits pulsed light, referring to the pulse width or the pulse interval is also useful for detecting the speed measuring device 30. The speed measuring device 30 emits pulse light of a specific wavelength at a predetermined duty ratio. From the viewpoint of safety, the duty ratio of the pulse light is set to a predetermined value or less. Therefore, the control unit 11 may determine whether or not the speed measuring device 30 exists based on a predetermined pulse width or pulse interval and the pulse width or pulse interval of the received light. For example, the control unit 11 determines that the speed measurement device 30 is present when the speed measurement device 30 is within a certain range from the reference pulse width or pulse interval, but otherwise determines that it is not present. The control unit 11 specifies a pulse width or a pulse interval based on at least the amount of light received by the first light receiving element 122. As described above, the control unit 11 can reduce the notification that the disturbance light is erroneously recognized as the light from the light emitting device.

<1-3-3. Control according to pulsed light intensity>
Referencing the intensity of the pulse light of the received light is also useful for detecting the light emitting device. The intensity of the pulse light increases as the vehicle 40 approaches the speed measuring device 30, and the distance decreases as the vehicle 40 moves away. Therefore, the control unit 11 may change the notification level according to the amount of pulse light received by the first light receiving element 122. For example, when the intensity of the pulse light is increasing, the control unit 11 may increase the notification level, and when decreasing, may decrease the notification level to notify. When the amount of received pulsed light is equal to or less than the threshold, the control unit 11 may determine that the speed measurement device 30 does not exist. As described above, the control unit 11 can notify the user according to the positional relationship between the light receiving unit 12 and the speed measurement device 30.

<1-3-4. Notification of the presence or absence of imaging>
After performing the notification control, the control unit 11 may perform control for notifying that an image has been captured or not, depending on whether a predetermined light is detected. When imaging is performed by the imaging unit 32, the strobe 33 emits light. Therefore, after performing the notification control, when detecting the light of the strobe 33, the control unit 11 may further notify that the image has been captured. Alternatively, if the control unit 11 does not detect the light of the strobe 33 after performing the notification control, the control unit 11 may notify that the image is not captured. This allows the user to know whether or not the vehicle 40 has been imaged. The light from the strobe 33 may be received using the light receiving unit 12 or another light receiving unit.

[2. Second Embodiment]
In this embodiment, the electronic device 10 has a function of notifying the presence of the speed measurement device 30 even when the electronic device 10 does not receive the pulse light and the microwave. The electronic device of this embodiment may or may not have some or all of the functions of the above-described first embodiment.

<2-1. Configuration of Second Embodiment>
FIG. 19 is a diagram illustrating an overview of the system according to the present embodiment. As shown in FIG. 19, there are various types of roads. For example, on the road Ar1 which is also used on a school road called a green belt, it is particularly important to observe the speed limit of the vehicle 40, and the possibility that the speed measuring device 30 is installed is different from other types of roads. It is considered higher than Ar2. Therefore, the control unit 11 may notify the presence of the speed measurement device 30 when the electronic device 10 is located on a predetermined type of road.

<2-2. Operation of Second Embodiment>
FIG. 20 is a flowchart illustrating the operation of the control unit 11 of the electronic device 10. The control unit 11 acquires position information from the GPS receiving unit 16 (Step S31). Next, the control unit 11 determines whether the current position indicated by the position information is within a predetermined area (Step S32). Here, the control unit 11 determines whether the vehicle 40 is on the green belt based on the current position and the data stored in the storage unit 18. When determining “YES” in step S32, the control unit 11 performs the notification control (step S33). The notification control includes, for example, control for displaying a notification screen on the display unit 13.

  FIG. 21 is a diagram illustrating an example of the notification screen. The notification screen illustrated in FIG. 21 is a screen in which the window W3 is arranged so as to overlap the map screen described above. In the window W3, an icon M3 indicating the presence of the speed measuring device 30 and a message indicating "the speed is within the caution area for speed control" indicating the presence of the speed measuring device 30 are arranged. The icon M3 is an icon that allows the user to recognize that the speed control point is performed based on the position information. That is, for example, the icon M3 is different from the icons M1 and M2. The notification control may include a control of outputting a notification sound from the speaker 14. In this case, the control unit 11 may output a voice saying “It is within the speed control caution area” from the speaker 14. The notification control may include control other than these, and may include, for example, control for causing the light emitting unit 23 to emit light. Note that the predetermined area is not limited to the green belt, and may be a one-way road or another type of road.

  With this configuration, the presence of the light emitting device can be notified based on the position information, so that the presence of the light emitting device can be notified without receiving the pulse light from the speed measuring device 30.

[3. Third Embodiment]
In this embodiment, the electronic device 10 has a plurality of light receiving units that receive pulsed light.

  FIG. 22 is a block diagram illustrating an electrical configuration of the electronic device 10. In this example, the electronic device 10 includes three light receiving units 12A, 12B, and 12C. Each configuration of the light receiving units 12A, 12B, and 12C may be the same as the light receiving unit 12 except for the characteristics of the wavelength selection unit. In FIG. 22, illustration of the display unit 13 to the cable terminal unit 24 described in FIG. 6 is omitted.

  FIG. 23 is a diagram illustrating characteristics of the first wavelength selection unit 121 and the second wavelength selection unit 123 of the light receiving units 12A, 12B, and 12C of this embodiment. 23A corresponds to the light receiving section 12A, FIG. 23B corresponds to the light receiving section 12B, and FIG. 23C corresponds to the light receiving section 12C. As shown in FIGS. 23 (a) to 23 (c), the light receiving sections 12A, 12B, and 12C have different wavelengths of pulse light to be received. As shown by a solid line in FIG. 23A, the first wavelength selection unit 121 of the light receiving unit 12A transmits light in a wavelength region including the specific wavelength λout1, here, a wavelength region from the wavelength λ11a to the wavelength λ11b. And blocks light in a different wavelength region. The second wavelength selection unit 123 blocks light in a wavelength region including the specific wavelength λout1, here, a wavelength region from the wavelength λ21a to the wavelength λ21b, as indicated by a broken line in FIG. Transmit light in the area. As shown by a solid line in FIG. 23B, the first wavelength selection unit 121 of the light receiving unit 12B transmits light in a wavelength region including the specific wavelength λout2, here, a wavelength region from the wavelength λ12a to the wavelength λ12b. And blocks light in a different wavelength region. The second wavelength selection unit 123 blocks light in a wavelength region including the specific wavelength λout2, here, a wavelength region from the wavelength λ22a to the wavelength λ22b, as indicated by a broken line in FIG. Transmit light in the area. As shown by the solid line in FIG. 23C, the first wavelength selection unit 121 of the light receiving unit 12C transmits light in a wavelength region including the specific wavelength λout3, here, a wavelength region from the wavelength λ13a to the wavelength λ13b. And blocks light in a different wavelength region. The second wavelength selection unit 123 blocks light in a wavelength region including the specific wavelength λout3, here, a wavelength region from the wavelength λ23a to the wavelength λ23b, as indicated by a broken line in FIG. Transmit light in the area. λout1, out2, and out3 are, for example, 850 nm, 950 nm, and 1900 nm, but are not limited thereto.

  When detecting the speed measurement device 30 based on the first signal Sig1 and the second signal Sig2 from any of the light receiving units 12A, 12B, and 12C, the control unit 11 notifies that the speed measurement device 30 is present. . According to this embodiment, even when a plurality of speed measuring devices 30 having different wavelengths of light emitted from the electronic device 10 exist or the wavelength of light emitted from the speed measuring device 30 is changed, the speed measuring device 30 is Can be reported.

  The characteristics of the plurality of light receiving units 12 may be the same. In this case, as shown in FIG. 24, light receiving units 12A, 12B, and 12C may be provided at different positions on vehicle 40. Here, the light receiving unit 12A is provided at the left front part, the light receiving unit 12B is provided at the center front part, and the light receiving unit 12C is provided at the right front part. This makes it possible to estimate the arrival direction of the laser based on the laser reception timings of the light receiving units 12A, 12B, and 12C. For example, when the light arrives from the front left, the light receiving timing of the light receiving unit 12A is relatively advanced, and when the light arrives from the front right, the light receiving timing of the light receiving unit 12C is relatively advanced. Furthermore, the control unit 11 may notify the user of the direction in which the pulse light has arrived.

  The speed measuring unit 31 emits pulse light to a mirror rotating at a constant speed, and emits pulse light Lout reflected by the mirror. Therefore, the light receiving timing of the pulse light Lout in each of the light receiving units 12A, 12B, and 12C includes, for example, the rotation speed of the mirror, the positions of the light receiving units 12A, 12B, and 12C, and the speed measurement with the light receiving units 12A, 12B, and 12C. A difference corresponding to the distance from the device 30 appears. Therefore, the control unit 11 may detect the speed measuring device 30 based on the light receiving timing of the pulse light Lout in the light receiving units 12A, 12B, and 12C.

  The light receiving portions 12A, 12B, and 12C may have different directions of light to be received. For example, the directions of the light receiving elements may be different by 20 degrees between the light receiving units 12A, 12B, and 12C. Thereby, there is a possibility that a decrease in detection accuracy due to the installation position of the speed measurement device 30 can be suppressed. In this embodiment, the number of light receiving units may be two or four or more.

[4. Configuration of light receiving unit 12]
Next, a configuration example of the light receiving unit 12 applicable to each of the above-described embodiments will be described.
FIG. 25 is a diagram illustrating a circuit configuration example of the light receiving unit 12. Here, the first light receiving element 122 is the photodiode PD1. Light passing through the first wavelength selector 121 enters the light receiving surface of the photodiode PD1. The cathode of PD1 is connected to the power supply line on the high potential side, and the anode is connected to one end of the resistor R1. The other end of the resistor R1 is grounded. The input terminal of the inverter INV1 is commonly connected to the anode of the photodiode PD1 and one end of the resistor R1. The output terminal of the inverter INV1 is connected to the negative input terminal of the differential amplifier AMP. The second light receiving element 124 is here a photodiode PD2. Light that has passed through the second wavelength selector 123 enters the light receiving surface of the photodiode PD2. The cathode of the photodiode PD2 is connected to a power supply line on the high potential side, and the anode is connected to one end of the resistor R2. The other end of the resistor R2 is grounded. The input terminal of the inverter INV2 is commonly connected to the anode of the photodiode PD2 and one end of the resistor R2. The output terminal of the inverter INV2 is connected to the positive input terminal of the differential amplifier AMP. As a result, a signal corresponding to the difference between the amounts of light received by the photodiodes PD1 and PD2 is output from the output terminal of the differential amplifier AMP. The control unit 11 detects the speed measuring device 30 based on the difference. The control unit 11 may detect the speed measuring device 30 based on the signal amplified by the differential amplifier AMP.

[5. External configuration of electronic device 10]
FIG. 26 is a six-view drawing illustrating an example of an external configuration of the electronic device 10. In this example, the display unit 13, the light emitting unit 23, and the illuminance sensor 201 of the sensor unit 20 are provided on the front surface of the housing of the electronic device 10. The speaker 14 is provided so as to output sound from the upper end surface of the housing 100. On the right end surface of the housing 100, a mounting portion 21 (that is, an SD card slot) for mounting an SD card (registered trademark) is provided. A light receiving unit 12 is provided in the upper right part on the rear surface of the housing 100. A power switch 221 of the power supply unit 22 and a DC jack 222 are provided at a lower left portion of the rear surface of the housing 100. An area 104 is an area in which a model name and a serial number are written.

[6. Modification]
The present disclosure is not limited to the above embodiments, and can be appropriately modified without departing from the gist.

(Modification 1)
The first wavelength selection unit 121 and the second wavelength selection unit 123 need not be band pass filters. The first wavelength selection unit 121 and the second wavelength selection unit 123 may be configured by, for example, a combination of a low-pass filter and a high-pass filter. Further, the second wavelength selection unit 123 may be a low-pass filter as shown by the characteristics in FIG. In this example, the second wavelength selection unit 123 transmits light in a wavelength range lower than the wavelength λ2a and blocks light in a wavelength range higher than the wavelength λ2a. The second wavelength selection unit 123 may be a high-pass filter as shown by the characteristics in FIG. In this example, the second wavelength selector 123 transmits light in a wavelength region higher than the wavelength λ2b and blocks light in a wavelength region lower than the wavelength λ2b. Even in this case, the amount of the second signal Sig2 received is extremely small during the period in which the pulse light Lout is received. The light receiving unit 12 receives not only the pulse light Lout intended for light reception but also disturbance light, and such disturbance light generally has a wide wavelength region in which energy is distributed. Therefore, even when the light receiving unit 12 receives disturbance light that is repeatedly turned on and off periodically, the amount of received light is considered to be large. Therefore, when the amount of received light of the first signal Sig1 is large and the amount of received light of the second signal Sig2 is small, that is, when the difference is equal to or larger than the threshold, it can be estimated that the pulse light Lout has been received. On the other hand, when the amount of received light of the first signal Sig1 is large and the amount of received light of the second signal Sig2 is large, that is, when the difference is smaller than the threshold, it can be estimated that the possibility that the pulse light Lout has been received is low. . Therefore, according to the electronic device 10, by using the first light receiving element 122 and the second light receiving element 124 to receive light, it is expected that the detection accuracy of the speed measuring device 30 is improved. In addition, the first wavelength selection unit 121 and the second wavelength selection unit 123 may be configured using an optical element other than a filter, such as a prism.

(Modification 2)
In the above-described embodiment, the light receiving section 12 has the first light receiving element 122 and the second light receiving element 124. However, the light receiving section 12 may have only one light receiving element. FIG. 28 is a diagram illustrating a configuration of an electronic device 10 according to this modification. In this example, the light receiving section 12 does not have the first light receiving element 122 and the second light receiving element 124 but has the light receiving element 128. The light receiving element 128 may have the same configuration as the first light receiving element 122 or the second light receiving element 124. Further, the electronic device 10 of this modification has a drive unit 60. The drive unit 60 moves the first wavelength selection unit 121 and the second wavelength selection unit 123 under the control of the control unit 11. The drive unit 60 has, for example, a motor and a gear. The control unit 11 moves the first wavelength selection unit 121 and the second wavelength selection unit 123 so as to alternately cover the light receiving surfaces of the light receiving elements 128 while the electronic device 10 is operating. That is, as shown in FIG. 29A, the control unit 11 first provides the first wavelength selection unit 121 on the light receiving surface of the light receiving element 128. Then, the control unit 11 acquires the signal acquired from the light receiving element 128 at this time as the first signal Sig1. Next, as illustrated in FIG. 29B, the control unit 11 first separates the first wavelength selection unit 121 from the light receiving surface of the light receiving element 128 and provides the second wavelength selection unit 123 on the light receiving surface. Then, the control unit 11 acquires the signal acquired from the light receiving element 128 at this time as the second signal Sig2. Then, the control unit 11 detects the speed measuring device 30 based on the first signal Sig1 and the second signal Sig2.

(Modification 3)
In the above-described embodiment, the light receiving unit 12 has the two first light receiving elements 122 and the second light receiving elements 124. However, the light receiving unit 12 may have three or more light receiving elements. Also in this case, the control unit 11 can expect improvement in the detection accuracy of the speed measuring device 30 by making the wavelength region of the light to be selected different for each of the three or more light receiving elements.

(Modification 4)
In the above description, the light receiving section 12 has at least one set of the wavelength selecting section and the light receiving element. Alternatively, the light receiving unit 12 may have a configuration having at least one light receiving element without having the wavelength selecting unit. For example, the light receiving unit 12 may receive a third light reception amount when a specific wavelength is selected and received instead of the second light reception amount which is a light reception amount of light having a wavelength different from the specific wavelength. In this case, the control unit 11 may perform control for notifying the presence of the speed measurement device 30 based on the second light reception amount and the third light reception amount.

  Further, the light receiving section 12 may receive the incident light by a single light receiving element. Then, the control unit 11 may perform control for notifying the presence of the speed measurement device 30 based on a pulse width or a pulse interval specified based on the amount of light received by the light receiving unit 12. The method using the pulse width or the pulse interval may be the same as the modification of the above-described first embodiment.

(Modification 5)
The light receiving element may be an imaging element included in a camera such as a drive recorder. For example, the control unit 11 acquires a captured image of the vehicle-mounted camera 50 and performs image analysis. It is desirable that the in-vehicle camera does not have an infrared cut filter. This is to prevent the pulse light Lout from being interrupted. Then, when light of a specific pattern is received as a result of the image analysis, the control unit 11 performs control to notify the presence of the speed measurement device 30. The control unit 11 may detect a specific pattern of light based on a change in brightness indicating that the light has a specific wavelength. When a specific pattern of light is received, the control unit 11 may record a captured image in a period corresponding to the light receiving period. The period is, for example, a period of one minute before and after the timing at which the light of the specific pattern is received, but is not limited thereto.

(Modification 6)
The electronic device 10 may detect the speed measuring device 30 behind the vehicle 40. In this case, the light receiving section 12 may be arranged so as to be able to receive the pulse light from the vehicle 40.

(Modification 7)
When detecting the speed measuring device 30, the electronic device 10 may upload information such as position information indicating the position of the speed measuring device 30 to the server. The server may be a server that provides a social networking service, or may be a server that manages and distributes update information on a notification target.

  Further, the system according to the present disclosure can be applied to detection of a light emitting device that emits light of a specific wavelength, in addition to detection of a speed measurement device.

(Modification 8)
Some of the configurations and operations described in the above embodiments may be omitted or changed. For example, the electronic device 10 may be a device that supports the optical system and does not support the radar system. Further, for example, the position, shape, and size of each member in the electronic device 10 are merely examples. Further, the light receiving unit 12 may be provided outside the electronic device 10. For example, the light receiving unit 12 may be provided at a predetermined position in the vehicle 40 such as the position of a license plate. In this case, the control unit 11 may acquire a signal from the light receiving unit 12 via the communication unit 17.

(Modification 9)
In addition, the control unit 11 determines whether or not the speed measurement device 30 is present, and when determining that at least the speed measurement device 30 is present, the control unit 11 may output a signal indicating the determination result to an external device. . This external device may notify that the speed measurement device 30 exists. Further, the present invention can be specified by a control device (for example, a control module) incorporated in the electronic device 10 and having the same function as the control unit 11.

  The scope of the present invention is not limited to the configuration explicitly described in the specification or the scope of the present invention, but includes the combination of various aspects of the present invention disclosed in the specification. Of the present invention, the configuration for which a patent is sought is specified in the appended claims. However, even if the present invention is not specified in the claims, it is disclosed in the present specification. The intention is to make such a configuration a claim in the future.

  The present invention is not limited to the configuration described in the above embodiment. The components of each of the above-described embodiments and modifications may be arbitrarily selected and combined. In addition, any constituent element of each embodiment or modification and any constituent element described in Means for Solving the Invention or a constituent element of any constituent element described in Means for Solving the Invention May be arbitrarily combined. We also intend to acquire rights in these amendments or divisional applications. Even if there is a description of "in the case of" or "in the case of", it is not described as a case or a configuration limited to that case. These cases and configurations that are not timely are also disclosed, and there is an intention to acquire rights. In addition, places described with the order are not limited to this order. It also discloses a configuration in which some parts have been deleted or the order has been changed, and the intent is to acquire rights.

  In addition, he has the intention to obtain rights for a whole design or a partial design by applying for a change to a design application. Although the drawings depict the entire device with solid lines, the drawings include not only the entire design but also a partial design claimed for a part of the device. For example, it is a drawing that includes a part of the device as a partial design irrespective of the members as well as a part of the device as a partial design. A part of the device may be a part of the device or a part of the member. I am willing to grant rights not only to the entire design but also to partial designs in which any part of the solid lines in the drawing is broken.

10: Electronic device 11: Control unit 12: Light receiving unit 12A: Light receiving unit 12B: Light receiving unit 12C: Light receiving unit 13: Display unit 14: Speaker 15: Microwave receiving unit 16: GPS receiving unit 17: Communication unit 18: Storage unit 19: operation unit 20: sensor unit 21: mounting unit 22: power supply unit 23: light emitting unit 24: cable terminal unit 30: speed measurement device 31: speed measurement unit 32: imaging unit 33: flash unit 40: vehicle 41: dashboard 50 : On-vehicle camera 60: drive unit 100: housing 101: first window 102: second window 103: partition 104: region 121: first wavelength selection unit 122: first light receiving element 123: second wavelength selection unit 124: second 2 light receiving element 125: interface 126: visible light cut filter 127: visible light cut filter 128: light receiving element 201: illuminance sensor 221: power switch 222: DC switch Click

Claims (22)

A system that emits light of a specific wavelength to notify the presence of a first device that detects the presence of a vehicle,
A housing arranged in the vehicle,
A display unit including a display area provided on the front surface of the housing,
A window located on the back of the housing;
A light receiving unit that receives light incident on the window,
A control unit that performs control for notifying the presence of the first device according to the light of the specific wavelength received by the light receiving unit,
With
Wherein the control unit as a control for notifying the presence of the first device, have row control to display on the display area of the image for informing the presence of at least the first device,
The system, wherein the window is located at least above a center in a vertical direction on a rear surface of the housing and at least on a left side with respect to a traveling direction of the vehicle when viewed from a driver seat side of the vehicle. The system according to claim 1, wherein the light receiving unit receives light from the first device via a lens. The system of claim 1 or 2 comprising a mirror for expanding the acceptance angle of the light from the first device of the light receiving portion. The system according to any one of claims 1 to 3 , wherein a member that cuts visible light is present in the window. The system according to any one of claims 1 to 4 , wherein the control unit performs control for notifying the presence of the first device based on a pulse width of light received by the light receiving unit. The system according to any one of claims 1 to 5 , wherein the control unit performs control to notify the presence of the first device based on a pulse interval of light received by the light receiving unit. Wherein, the system according to any one of claims 1 to 6, wherein the light receiving portion changes the level of the notification in accordance with the intensity of the light of the specific wavelength of light received. The system according to claim 7 , wherein the control unit increases the notification level when the intensity of the light of the specific wavelength received by the light receiving unit is increasing. Wherein the control unit The system of claim 7 or claim 8 intensity of the light of the specific wavelength which the light receiving section has received is if you are reduced to lower the notification level. The system according to any one of claims 1 to 9 , wherein the control unit changes the level of the notification according to the number of pulses of light received by the light receiving unit. A system that emits light of a specific wavelength to notify the presence of a first device that detects the presence of a vehicle,
A housing arranged in the vehicle,
A display unit including a display area provided on the front surface of the housing,
A window located on the back of the housing;
A light receiving unit that receives light incident on the window,
A control unit that performs control for notifying the presence of the first device according to the light of the specific wavelength received by the light receiving unit,
With
The control unit performs control to display at least an image for notifying the presence of the first device in the display area, as control for notifying the presence of the first device,
The control unit changes a level of the notification according to a number of light pulses received by the light receiving unit.
system. The control unit acquires position information of a current position, and when a position indicated by the acquired position information satisfies a predetermined condition, the presence of a second device that emits light of the specific wavelength to detect the presence of a vehicle. The system according to any one of claims 1 to 11, wherein control for notifying is performed. The system according to claim 12, wherein the control unit performs control to notify the presence of the second device when the current position indicated by the acquired position information is within a predetermined area as the condition. The control unit notifies the presence of the first device according to a first method according to the light received by the light receiving unit, and the second method according to a second method different from the first method according to the current position. The system according to claim 12, wherein the control is performed so as to notify the presence of the two devices. Equipped with a radio wave receiver that receives a predetermined radio wave,
The system according to any one of claims 1 to 14, wherein the control unit performs control for notifying the presence of the radio wave generator in response to receiving the predetermined radio wave. The control unit notifies the presence of the first device by a first method according to the light received by the light receiving unit, and changes the third method different from the first method by receiving the predetermined radio wave. The system according to claim 15, wherein the control is performed so as to notify the presence of the radio wave generating device by the method of (1). The system according to claim 1, wherein the light receiving unit is shielded with a conductive material. Wherein the control unit acquires the image captured by the vehicle-mounted camera, claim 1 having the function of recording the captured image of the period corresponding to the light receiving period of the light of the specific wavelength to any one of claims 17 The described system. A system that emits light of a specific wavelength to notify the presence of a first device that detects the presence of a vehicle,
A housing arranged in the vehicle,
A display unit including a display area provided on the front surface of the housing,
A window located on the back of the housing;
A light receiving unit that receives light incident on the window,
A control unit that performs control for notifying the presence of the first device according to the light of the specific wavelength received by the light receiving unit,
With
The control unit performs control to display at least an image for notifying the presence of the first device in the display area, as control for notifying the presence of the first device,
The control unit has a function of acquiring a captured image of a vehicle-mounted camera and recording the captured image in a period corresponding to a light receiving period of the light of the specific wavelength.
system. The system according to any one of claims 1 to 19, wherein, when the control unit detects the first device, the control unit has a function of uploading information indicating a position of the first device to a server. A housing,
A light receiving unit provided on the housing and capable of receiving a laser beam for measuring the speed of the vehicle,
A display unit provided on the housing, the display unit including a display area for performing an alarm according to a light receiving state of the light receiving unit;
Have,
The light receiving unit is provided so as to introduce the laser light from a rear surface that is a surface opposite to the display region of the housing,
Of the rear surface of the housing, at least above the center in the vertical direction, and at least has a circular window located on the left side with respect to the traveling direction of the vehicle when viewed from the driver's seat side of the own vehicle,
The laser light is introduced into the light receiving unit through the circular window and the lens so as to pass through a visible light cut filter,
A detector wherein the light receiving unit is shielded by using a conductive material. A program for causing a computer to realize the function of the control unit of the system according to any one of claims 1 to 20.