JP2012028224A - Lighting device - Google Patents

Abstract

Provided is an illuminating device capable of irradiating light suitable for human visibility over the entire irradiation range of a light source and improving the visibility after the light source is turned on.
The illumination unit includes a plurality of light source units that irradiate light to each of the areas 51 in which the irradiation range is divided and the wavelength configuration of the light is variable, and the light source unit is irradiated in each area. The calculation unit 3 that calculates the ratio of the long wavelength component and the short wavelength component of the light that the light source unit 11 irradiates to the area 51 based on the sum of the brightness by the light to be emitted and the brightness by the ambient light 6; The light source unit 11 includes a control unit 4 that controls the wavelength configuration of light emitted to the area 51 based on the calculation result for each area 51.
[Selection] Figure 1

Description

  The present invention relates to a lighting device.

  Conventionally, as a device that realizes energy saving and improved visibility, there has been proposed a lighting device that includes a sensor that detects the brightness of the irradiation range of the light source and feedback-controls the output level of the light source using the detection result of the sensor. (For example, refer to Patent Document 1).

  In Patent Document 1, the brightness of the floor surface is constantly monitored by a luminance detector that can be installed at an arbitrary location. Then, an area where the necessary brightness is obtained by natural lighting and an area where the necessary brightness is not obtained are discriminated, and lighting on / off is automatically controlled.

  Further, it is known that human visibility changes depending on the brightness of the surroundings. There are two types of optical sensors in the human retina: cones and rods. In a bright environment (hereinafter referred to as photopic vision), a cone works, and in a dark environment (hereinafter referred to as dark vision), a rod works so that brightness can be perceived. Furthermore, it is known that both cones and rods work in a dim environment (hereinafter referred to as twilight).

  In photopic, scotopic, and dimmed vision, the luminous sensitivity characteristics (spectral luminous efficiency) differ depending on the wavelength of light due to the difference in optical sensors (cone and rod) that work on the human retina. FIG. 16 shows spectral luminous efficiency in photopic and scotopic visions. As shown in FIG. 16, the peak wavelength of the spectral luminous efficiency R1 in photopic vision is 555 nm, and the peak wavelength of the spectral luminous efficiency R2 in dark vision is 507 nm.

  For example, the color of light that feels bright (the color that is easy to see) differs between daytime (light vision) and nighttime (dark vision). As it changes from daytime to evening and nighttime, it changes from photopic vision to twilight vision and scotopic vision, so the light that feels bright also changes to the short wavelength side.

  Therefore, a headlamp device has been proposed that changes the color of light emitted by a vehicle headlamp based on human visibility characteristics (see, for example, Patent Document 2). The headlamp device of Patent Document 2 detects the brightness around the vehicle, and increases the blue component (short wavelength component) in the case of a predetermined low illuminance state. Thereby, the visibility of the light from the headlamp is improved from other vehicles.

JP 7-21814 A JP 2007-10634 A

  In the headlamp device of Patent Document 2, the visibility of the headlamp from another vehicle is improved, but the visibility of the irradiation range by the headlamp is not considered. That is, since the brightness of the irradiation range changes before and after the headlamp is turned on, the visibility characteristics (adaptation state) of the eye change.

  In addition, the brightness varies within the irradiation range of the headlamp depending on the distance from the headlamp or ambient light, and the brightness of the range irradiated with one light source is not uniform. Therefore, the adaptation state of the eyes is different even within the irradiation range, and it is not sufficient to realize a good visual environment simply by detecting the brightness at one location and determining the light output level.

  In Patent Document 1, energy saving is achieved by detecting the brightness of natural light or the like for each area and adjusting the light output level, but the wavelength configuration of the light is not changed. That is, the illumination device of Patent Document 1 does not consider the visibility.

  This invention is made | formed in view of the said reason, The objective can irradiate the light suitable for human visual sensitivity over the whole irradiation range of a light source, and can improve the visibility after light source lighting. The object is to provide a lighting device.

  The illumination device of the present invention irradiates light to each area obtained by dividing a predetermined range into a plurality of areas, and includes an illumination unit including a plurality of light source units that make the wavelength configuration of the light variable, and the light source unit irradiates each area. A calculation unit that calculates a ratio of the long wavelength component and the short wavelength component of the light that the light source unit irradiates to the area based on the sum of the first brightness by the light to be emitted and the second brightness by the ambient light; And a control unit that controls the wavelength configuration of light that the light source unit irradiates to the area based on the calculation result for each area.

  This lighting device includes a detection unit that detects the brightness of each area, and the detection unit calculates, for each area, the sum of the first brightness by the light emitted from the light source unit and the second brightness by the ambient light. It is preferable to detect and output the detection result to the calculation unit.

  The illumination device includes a detection unit that detects the brightness of each area, and a storage unit that stores data of the first brightness for each area based only on light emitted from the light source unit, and the detection unit includes ambient light. The second brightness for each area is detected and output to the calculation unit, and the calculation unit is configured to output the light source unit for each area based on the detection result of the detection unit and the data stored in the storage unit. It is preferable to derive the sum of the first brightness due to the irradiation light and the second brightness due to the ambient light.

  In this lighting device, the light source unit is composed of a high color temperature light source having a high color temperature and a low color temperature light source having a low color temperature relative to the high color temperature light source. Based on the above, it is preferable to control the wavelength configuration of light emitted from the light source unit by dimming control of the high color temperature light source and the low color temperature light source.

  In this lighting device, the light source unit is composed of a high color temperature light source having a high color temperature and a low color temperature light source having a low color temperature relative to the high color temperature light source. Based on the above, it is preferable to control the wavelength configuration of the light emitted from the light source unit by turning on only one of the high color temperature light source and the low color temperature light source.

  In this illuminating device, the light source section is composed of a plurality of high color temperature light sources and a plurality of low color temperature light sources, and the high color temperature light sources and the low color temperature light sources are preferably mounted alternately.

  In this illumination device, the illumination unit preferably has a mounting surface on which the light source unit is mounted, and the mounting surface is preferably formed in a curved surface.

  As described above, the present invention has an effect of improving the visibility after the light source is turned on by irradiating light suitable for human visibility over the entire irradiation range of the light source.

It is a figure which shows the block block diagram of the illuminating device of Embodiment 1 of this invention. It is a graph which shows the spectral intensity of the light which LED of the light source part same as the above irradiates. (A) It is the schematic which shows the irradiation range of the illumination part same as the above. (B) It is a graph which shows the detection result of the detection part in each area. It is a graph which shows the adaptation brightness | luminance of each area. It is a flowchart which shows control same as the above. It is a graph which shows the spectral intensity of the light which the light source part same as the above irradiates. (A) It is a graph which shows the spectral intensity of the light which high color temperature LED and low color temperature LED irradiate. (B) It is a table | surface which shows the characteristic of the light which a high color temperature LED and low color temperature LED irradiate. It is the schematic which shows the external appearance of high color temperature LED and low color temperature LED. (A) It is the schematic which shows the external appearance of the instrument main body by which the mounting surface was formed in the spherical surface. (B) It is the schematic which shows the external appearance of the instrument main body by which the mounting surface was formed in the plane. (A) It is the schematic which shows mounting arrangement | positioning of high color temperature LED and low color temperature LED. (B) It is the schematic which shows distribution of the light irradiated to each area. (A) It is the schematic which shows mounting arrangement | positioning of high color temperature LED and low color temperature LED. (B) It is the schematic which shows distribution of the light irradiated to each area. It is a schematic block diagram of a street light. (A) It is a schematic block diagram of an instrument main body. (B) It is the schematic which shows arrangement | positioning of a photodiode. It is a figure which shows schematic structure of a detection part. It is a figure which shows schematic structure of a detection part. It is a graph which shows a visibility characteristic.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 shows a block diagram of the illumination device of the present embodiment. The illumination device according to the present embodiment includes an illumination unit 1, a detection unit 2, a calculation unit 3, and a control unit 4.

  The illumination unit 1 includes a plurality of light source units 11. The light source unit 11 of this embodiment includes a blue LED 12a, a green LED 12b, and a red LED 12c. FIG. 2 shows the relative spectral intensities of the LEDs 12a to 12c. 2, G1 indicates the spectral intensity of the blue LED 12a, G2 indicates the spectral intensity of the green LED 12b, and G3 indicates the spectral intensity of the red LED 12c. The light source unit 11 includes a lighting circuit (not shown), and the lighting circuit controls the lighting power supplied to the LEDs 12a to 12c, so that the output levels of the LEDs 12a to 12c are configured to be variable. . And the wavelength structure (spectral intensity) of the color mixing light of each LED12a-12c can be changed for every light source part 11 by changing the output level of each LED12a-12c. In addition, although the light source part 11 of this embodiment is comprised by LED, it is not limited to LED, A discharge lamp or organic EL etc., such as a fluorescent lamp, may be sufficient.

  FIG. 3A shows a schematic diagram of the irradiation range of the illumination unit 1. The illumination unit 1 irradiates light toward the road surface 5. Specifically, the illumination range of the illumination unit 1 is divided into a plurality of areas 51, and each light source unit 11 irradiates light to the area 51 corresponding to each. In this embodiment, the area immediately below the illumination unit 1 is 51a, the area away from the illumination unit 1 on one side is 51b, and the area away from the illumination unit 1 on the other side and irradiated with the ambient light 6 is 51c. The light source unit that irradiates the area 51a with light is 11a, the light source unit that irradiates the area 51b with light 11b, and the light source unit that irradiates the area 51c with light 11c. FIG. 4 shows a distribution diagram of brightness (adaptation luminance) in the irradiation range of the illumination unit 1. 4, L1 is the adaptation luminance (second brightness) due to only the ambient light 6, L2 is the adaptation luminance (first brightness) due to only the illumination unit 1, and L3 is the adaptation between the ambient light 6 and the illumination unit 1. The sum of luminance is shown. The ambient light 6 is sunlight or light from other lighting fixtures, and indicates light other than the light irradiated by the lighting unit 1.

  The detection unit 2 detects the brightness of each area 51. The detection unit 2 includes a photodiode, an image sensor that detects the luminance of the road surface 5, or an illuminance sensor installed on the road surface 5. The detection unit 2 detects the adaptation luminance (background luminance) or illuminance of each area 51. The detection result is output to the calculation unit 3. The detection unit 2 of the present embodiment is a sum of the adaptation luminance (see L2 in FIG. 4) due to the light emitted by the illumination unit 1 in each area 51 and the adaptation luminance (see L1 in FIG. 4) due to the ambient light 6 (see FIG. 4). 4 (see L3 in FIG. 4).

FIG. 3B shows a detection result of the detection unit 2 for each area 51. The area 51a is directly below the illumination unit 1 and has the highest adaptation luminance, which is 20 cd / m ² . Since the area 51b is away from the illumination unit 1, the adaptation brightness is low and is 0.5 cd / m ² . The area 51c is away from the illumination unit 1, but has a high adaptation luminance because the ambient light 6 is irradiated, and is 13 cd / m ² .

The calculation unit 3 is composed of a microcomputer or the like, and determines the adaptation state of the human eye existing in each area 51 (hereinafter referred to as the adaptation state of the area 51) from the detection result of the detection unit 2. The computing unit 3 of the present embodiment uses an adaptation threshold value to determine the adaptation state (photopic vision, faint vision) of each area 51. The adaptation threshold is set to 10 cd / m ² , and the calculation unit 3 determines that 10 cd / m ² or more is photopic vision and less than 10 cd / m ^{2 is} dim vision.

  Then, the calculation unit 3 calculates the wavelength configuration of the light according to the visibility of each area 51 from the adaptation state of each area 51. The calculation unit 3 keeps the intensity of the light emitted from the light source unit 11 (the sum of the output levels of the LEDs 12a to 12c) and varies the output ratio of the LEDs 12a to 12c, thereby changing the light emitted from the light source unit 11. Change the wavelength configuration. Therefore, the calculation unit 3 derives the output ratio of the LEDs 12 a to 12 c for each light source unit 11 corresponding to each area 51 from the adaptation state of each area 51. Then, the calculation unit 3 outputs the derived output ratio (wavelength configuration) of the LEDs 12 a to 12 c of each light source unit 11 to the control unit 4. In this embodiment, when the calculating part 3 judges that it is photopic vision, the calculating part 3 sets the output ratio of each LED12a-12c as blue: green: red = 1.0: 1.0: 1.0. Hereinafter, when the output ratio of each of the LEDs 12a to 12c is blue: green: red = 1.0: 1.0: 1.0, it is referred to as a photopic mode. On the other hand, when the calculating part 3 judges that it is dimmed, the calculating part 3 sets the output ratio of each LED12a-12c as blue: green: red = 1.0: 1.4: 0.6. Hereinafter, when the output ratio of each of the LEDs 12a to 12c is blue: green: red = 1.0: 1.4: 0.6, it is referred to as the twilight mode.

  The control unit 4 includes a power supply unit that drives the lighting device and an output control unit that controls the output levels of the LEDs 12 a to 12 c of the light source units 11. And the control part 4 controls the wavelength structure of the light which the light source part 11 irradiates by controlling the output level of each LED12a-12c of the light source part 11 based on the wavelength structure which the calculating part 3 set.

  FIG. 6 shows the spectral intensity of the light irradiated by the light source unit 11 (mixed light of the LEDs 12a to 12c). G4 in FIG. 6 indicates the spectral intensity when the light source unit 11 is turned on in the photopic vision mode, and G5 indicates the spectral intensity when the light source unit 11 is turned on in the low vision mode. As shown in FIG. 6, the light (G5) emitted from the light source unit 11 in the thin vision mode has fewer long wavelength components and the short wavelength component compared to the light (G4) emitted from the light source unit 11 in the photopic mode. There are many. Accordingly, when the light source unit 11 irradiates light in the photopic vision mode to the photopic vision area 51, the adaptation state becomes light suitable for the visual sensitivity of the human eye, and the visibility is improved. On the other hand, when the light source unit 11 irradiates light to the area 51 in which the adaptation state is dim vision, the light is adapted to the visibility of the human eye, and the visibility is improved.

  Next, the flow of processing performed by the lighting device of the present embodiment will be described using the flowchart shown in FIG.

  In the illumination device of the present embodiment, first, the control unit 4 turns on each light source unit 11 of the illumination unit 1 in the photopic mode and irradiates each area 51 (S1).

  Next, the detection unit 2 detects the adaptation luminance of each area 51 (S2). In a state where each light source unit 11 irradiates each area 51, the detection unit 2 detects the adaptation luminance of each area 51, and outputs the detection result to the calculation unit 3 (see FIG. 4B).

Next, the calculating part 3 judges the adaptation state of each area 51 from the detection result of the detection part 2 (S3). As shown in FIG. 4B, the detection result of the detection unit 2 is that the adaptation brightness of the area 51a is 20 cd / m ² , the adaptation brightness of the area 51b is 0.5 cd / m ² , and the adaptation brightness of the area 51c is 13 cd / m. ² The adaptation threshold is set to 10 cd / m ² . Accordingly, the calculation unit 3 determines that the areas 51a and 51c are photopic and the area 51b is dim.

  And the calculating part 3 calculates the wavelength structure of the light which the light source part 11 corresponding to the area 51 irradiates from the adaptation state of each area 51. The calculation unit 3 sets the wavelength configuration of the light source units 11a and 11c that irradiate light to the areas 51a and 51c determined to be photopic as the photopic mode (S4a). In addition, the wavelength configuration of the light source unit 11b that irradiates light to the area 51b that has been determined to be twilight is set to twilight mode (S4b).

  Next, the control unit 4 controls the wavelength configuration of light emitted from the light source unit 11 based on the wavelength configuration derived by the calculation unit 3 (S5a, S5b). The control unit 4 changes the wavelength configuration of the light source unit 11. The light source unit 11 is varied based on the wavelength configuration derived by the calculation unit 3 corresponding to the area 51 irradiated by the light source unit 11.

  In the present embodiment, since the light source units 11a and 11c corresponding to the photopic areas 51a and 51c have already emitted light in the photopic mode, the control unit 4 performs photopic vision of the light sources 11a and 11c. Maintain mode. Further, in the light source unit 11b corresponding to the faint vision area 51b, the control unit 4 switches the wavelength configuration from the photopic mode to the faint vision mode.

  As described above, in the illumination device of the present embodiment, the detection unit 2 detects the adaptation luminance of each area 51 in a state where the light source unit 11 is turned on, and matches the visibility of each area 51 when the light source unit 11 is turned on. The operation unit 3 derives the wavelength configuration. And based on this derivation | leading-out result, the control part 4 switches the wavelength structure of the light source part 11 irradiated to this area 51. FIG. Therefore, in each area 51, the light source 11 emits light that matches the visibility in the lighting state of the light source unit 11, so that the visibility when the light source unit 11 is in the lighting state can be improved. Furthermore, since the adaptive luminance is detected for each of the plurality of areas 51 and the wavelength configuration of the light irradiated for each area 51 is switched, the visibility can be improved over the entire irradiation range.

  In the present embodiment, the areas 51a to 51c are selected from the plurality of areas 51, but the same control as described above is performed for the other areas 51.

  In the present embodiment, the adaptive luminance of each area 51 is detected in a state where the light source unit 11 is turned on in the photopic mode. However, each area is detected in a state where the light source unit 11 is turned on in the thin vision mode. 51 adaptation luminances may be detected. Moreover, if it is a wavelength structure match | combined with the visibility based on the adaptation brightness | luminance of each area 51, it will not be limited to output ratio of said each LED12a-12c.

In this embodiment, the adaptation state of each area 51 is determined using one adaptation threshold. However, a plurality of adaptation thresholds may be set to switch the wavelength configuration of light step by step. For example, when the adaptation luminance is smaller than the adaptation luminance 0.5 cd / m ^{2 of the} faint vision area 51b, the light is adapted to the visual sensitivity by increasing the short wavelength component further than in the mesopic vision mode. Further, the wavelength configuration of the light may be continuously changed based on the adaptive luminance of each area 51.

  Further, in the present embodiment, the detection unit 2 detects the sum of the adaptation luminance for each area 51 by the light of the illumination unit 1 and the ambient light 6, but the detection unit 2 is in a state where the illumination unit 1 is turned off. You may comprise so that the adaptation brightness | luminance of each area 51 by only the ambient light 6 may be detected (refer L1 of FIG. 4). In that case, the data of the adaptation brightness of each area 51 by only the light irradiated by the illumination unit 1 is stored in advance in a storage unit (not shown) (see L2 in FIG. 4). Then, the calculation unit may add the detection result of the detection unit 2 and the data of the adaptation luminance stored in the storage unit, and derive and calculate the adaptation luminance in each area 51 (see L3 in FIG. 4). ).

(Embodiment 2)
The light source unit 11 of the present embodiment is composed of two types of LEDs. The light source unit 11 according to the first embodiment includes three types of LEDs, a blue LED 12a, a green LED 12b, and a red LED 12c, and irradiates the mixed color light for each area 51. However, the light source unit 11 of the present embodiment is composed of two types of LEDs, a high color temperature LED 12d and a low color temperature LED 12e, and only one of the high color temperature LED 12d and the low color temperature LED 12e is lit. Irradiation is performed for each area 51. Since other configurations are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

  FIG. 7A shows the relative spectral intensities of the high color temperature LED 12d and the low color temperature LED 12e. G6 shown in FIG. 7A indicates the spectral intensity of the high color temperature LED 12d, and G7 indicates the spectral intensity of the low color temperature LED 12e. Further, as shown in FIG. 7B, the light emitted from the high color temperature LED 12d has chromaticity coordinates of x = 0.2912, y = 0.2921, a correlated color temperature of 8740K, and a deviation of DUV = -4. .48. On the other hand, the light emitted from the low color temperature LED 12e has a chromaticity coordinate of x = 0.3141, y = 0.3343, a correlated color temperature of 6394K, and a deviation of DUV = 5.20. As described above, the high color temperature LED 12d contains a lot of short wavelength components and has a high color temperature. On the other hand, the low color temperature LED 12e has a lower color temperature than the high color temperature LED 12d. That is, when the high color temperature LED 12d is lit, the viewing environment is suitable for light vision, and when the low color temperature LED 12e is lit, the viewing environment is suitable for photopic vision.

  In the present embodiment, only the high color temperature LED 12d is turned on as an initial state, so that it is in dim view. Then, the detection unit 2 detects the brightness of each area 51. The following description will be made assuming that the detection result of the detection unit 2 is the same as that of the first embodiment (see FIGS. 3A and 3B).

  The calculation unit 3 controls turning off of the high color temperature LED 12d and turning on of the low color temperature LED 12e in order to match the wavelength configuration of the light source units 11a and 11c that irradiate the areas 51a and 51c determined as photopic vision with photopic vision. Instruct part 4. Then, the control unit 4 turns off the high color temperature LEDs 12d of the light source units 11a and 11c that irradiate the areas 51a and 51c, and turns on the low color temperature LEDs 12e. Thereby, the color temperature of the light applied to the areas 51a and 51c is low, and the light is suitable for the visibility in photopic vision, and the visibility is improved.

  On the other hand, since the light suitable for the thin vision is irradiated in the initial state, the calculation unit 3 maintains the lighting state of the low color temperature LED 12e of the light source unit 11b that irradiates the area 51b determined to be the thin vision. Therefore, the color temperature of the light applied to the area 51b is high, and the light is suitable for the visibility in thin vision and the visibility is improved.

  In the present embodiment, a light environment with high visibility can be realized with the same energy amount by turning on the LEDs 12d and 12e having higher visibility according to the adaptation state of the eyes in each area 51. Furthermore, in this embodiment, since the wavelength configuration of the light irradiated for each area 51 can be changed only by switching on / off the two LEDs 12d and 12e, the control becomes easy.

  In this embodiment, the adaptation brightness of each area 51 is detected with the high color temperature LED 12d lit. However, the adaptation brightness of each area 51 is detected with the low color temperature LED 12e lit. Also good. In addition, the adaptation brightness of each area 51 may be detected in a state where different LEDs 12d and 12e are turned on for each area 51.

  Next, the structure of the illumination unit 1 will be described.

  FIG. 8 shows a schematic diagram of the LEDs 12d and 12e, and FIG. 9A shows a schematic diagram of the illumination unit 1 provided with the LEDs 12d and 12e.

  As shown in FIG. 8, the high color temperature LED 12d and the low color temperature LED 12e of the present embodiment are formed in a substantially hemispherical shape and irradiate light from the bottom surface side toward the spherical surface side. Moreover, the illumination part 1 is comprised by the instrument main body 13 and LED12d, 12e mounted in the instrument main body 13. FIG. As shown in FIG. 9A, the instrument body 13 is formed in a hemispherical shape, and its spherical surface (curved surface) constitutes a mounting surface, and the high color temperature LED 12d and the low color temperature LED 12e are mounted on the spherical surface. Is done.

  Since the LEDs 12d and 12e have high directivity of light to irradiate, the irradiation range is limited if the fixture body 13a having a flat mounting surface for the LEDs 12d and 12e is used as shown in FIG. 9B. End up. However, in this embodiment, since the instrument body 13 having a spherical mounting surface is used, the irradiation range can be expanded even when the same number of LEDs 12d and 12e are mounted on the instrument body 13a.

  Next, a specific arrangement of the high color temperature LED 12d and the low color temperature LED 12e mounted on the illumination unit 1 will be described.

  FIG. 10A shows a layout of the high color temperature LED 12d and the low color temperature LED 12e when the illumination unit 1 is viewed from the road surface 5. FIG. In FIG. 10A, the mounting surface of the instrument body 13 is shown as a plane in order to make the arrangement of the LEDs 12d and 12e easier to understand.

  In the illuminating unit 1 of the present embodiment, LEDs 12d and 12e are mounted on the instrument body 13 in 10 rows × 8 columns. The same type of LEDs 12d and 12e are mounted side by side in the same row, and the high color temperature LED 12d and the low color temperature LED 12e are alternately mounted in the same column. In this embodiment, the low color temperature LED 12e is mounted on the first row, and the high color temperature LED 12d is mounted on the second row. The number of LEDs 12d, 12e mounted in 10 rows × 8 columns is an example, and is not limited to 10 rows × 8 columns, and may be configured with other numbers of rows and other columns. Good.

  In this embodiment, one light source unit 11 is configured by the LEDs 12d and 12e mounted in each row. In the present embodiment, the light source unit 11 is configured by the LEDs 12d and 12e mounted in one row. However, the light source unit 11 is not limited to one column, and a plurality of rows may be collectively used as the light source unit 11.

  FIG. 10B shows the light distribution when each area 51 is irradiated using the illumination unit 1 in which the LEDs 12d and 12e are mounted on the fixture body 13 as described above. In addition, the adaptation brightness | luminance of each area 51 is demonstrated below supposing that it is the same as that of Embodiment 1 (refer Fig.3 (a) (b)). Since the areas 51a and 51c are in photopic vision, the light of only the low color temperature LED 12e is irradiated, and the area 51b is dimly illuminated, so that the light of only the high color temperature LED 12d is irradiated.

  If the low color temperature LED 12e is mounted on the 3rd to 7th rows of the instrument body 13 and the high color temperature LED 12d is mounted on the 1st, 2nd and 8th to 10th rows as shown in FIG. The light distribution 51 is as shown in FIG. As shown in FIG. 11B, the photopic areas 51 a and 51 c are not irradiated with light near both ends, and the light mesoscopic area 51 b is not irradiated with light near the center. Unevenness occurs. However, in this embodiment, since the high color temperature LED 12d and the low color temperature LED 12e are alternately mounted for each row, unevenness of light in the photopic areas 51a and 51c and the light vision areas 51b is prevented. It can be suppressed and a good visual environment can be realized.

  Next, the configuration of the detection unit 2 will be described.

  The illuminating device of this embodiment is a street lamp as shown in FIG. 12, and the illuminating unit 1 is provided on an upper portion of a support column 52 provided on the road surface 5. And the calculating part 3 and the control part 4 are accommodated in the inside of the instrument main body 13. FIG. And as shown to Fig.13 (a), LED12d, 12e is mounted in the spherical surface of the instrument main body 13, and the some light source part 11 is comprised.

  The detection unit 2 of the present embodiment includes a plurality of photodiodes 21, and is provided between the high color temperature LED 12d and the low color temperature LED 12e as shown in FIG. The photodiode 21 is masked so that it can detect the brightness of the road surface 5 without directly detecting the light emitted by the LEDs 12d and 12e. The photodiode 21 detects the road surface brightness of each area 51 and outputs a detection current to the calculation unit 3. Then, the calculation unit 3 determines the adaptation state based on the detected current, and instructs the control unit 4 to turn on the high color temperature LED 12d or the low color temperature LED 12e. The control unit 4 turns on the high color temperature LED 12d or the low color temperature LED 12e for each light source unit 11 based on an instruction from the calculation unit 3.

  Moreover, the detection part 2 may be comprised with the photodiode 22, the transmitter 23, and the receiver 24, as shown in FIG. The photodiode 22 and the transmitter 23 are integrally provided to form a sensor unit 25, and the transmitter 23 transmits data on the current detected by the photodiode 22 to the receiver 24. The receiver 24 is housed in the instrument main body 13 and receives data on the detection current of the photodiode 22 transmitted from the transmitter 23.

  The sensor unit 25 is installed on the road surface 5 of each area 51, and the photodiode 22 detects the brightness of each area 51. Then, the transmitter 23 transmits the detected current data to the receiver 24, and the receiver 24 outputs the received detected current data to the calculation unit 3. Subsequent control is the same as described above, and will be omitted.

  Moreover, the detection part 2 may be comprised with the camera 26 provided in the support | pillar 52, as shown in FIG. The camera 26 images each area 51. Then, the calculation unit 3 performs image processing on the imaging data of the camera 26 to derive the adaptation brightness of each area 51 and determines the adaptation state of each area 51. Subsequent control is the same as described above, and will be omitted.

DESCRIPTION OF SYMBOLS 1 Illumination part 2 Detection part 3 Calculation part 4 Control part 11 Light source part 12a Blue LED
12b Green LED
12c Red LED

Claims (7)

Illuminating unit comprising a plurality of light source units that irradiate light for each area obtained by dividing a predetermined range into a plurality of parts and make the wavelength configuration of the light variable;
In each area, a long wavelength component and a short wavelength component of light that the light source unit emits to the area based on the sum of the first brightness by the light emitted by the light source unit and the second brightness by the ambient light. An arithmetic unit for calculating the ratio of
An illumination device comprising: a control unit that controls a wavelength configuration of light that the light source unit irradiates to the area based on a calculation result for each area of the calculation unit. A detector for detecting the brightness of each area;
The detection unit detects, for each area, the sum of the first brightness caused by light emitted from the light source unit and the second brightness caused by ambient light, and outputs the detection result to the calculation unit. The lighting device according to claim 1. A detector for detecting the brightness of each area;
A storage unit for storing data of the first brightness for each of the areas by only light emitted by the light source unit;
The detection unit detects the second brightness for each area by only ambient light and outputs the second brightness to the calculation unit,
The arithmetic unit, based on the detection result of the detection unit and the data stored in the storage unit, for each area, the first brightness by the light emitted by the light source unit and the ambient light The lighting device according to claim 1, wherein a sum of the second brightness and the second brightness is derived. The light source unit includes a high color temperature light source having a high color temperature and a low color temperature light source having a low color temperature with respect to the high color temperature light source.
The control unit controls the wavelength configuration of light emitted from the light source unit by performing dimming control on the high color temperature light source and the low color temperature light source based on a calculation result of the calculation unit. The lighting device according to any one of claims 1 to 3. The light source unit includes a high color temperature light source having a high color temperature and a low color temperature light source having a low color temperature with respect to the high color temperature light source.
The control unit is configured to turn on only one of the high color temperature light source and the low color temperature light source based on a calculation result of the calculation unit, thereby configuring a wavelength configuration of light emitted by the light source unit. The lighting device according to claim 1, wherein the lighting device is controlled.   The light source unit includes a plurality of the high color temperature light sources and a plurality of the low color temperature light sources, and the high color temperature light sources and the low color temperature light sources are alternately mounted. The lighting device according to claim 4 or 5. The illumination unit has a mounting surface on which the light source unit is mounted,
The lighting device according to claim 1, wherein the mounting surface is formed in a curved surface.

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