KR102705242B1 - High efficiency receiving lens - Google Patents

Abstract

According to an embodiment of the present invention, a high-efficiency light-receiving lens module includes a light-receiving lens having a first lens surface for receiving light from the outside, and a second lens surface for changing an optical path of light received by the first lens surface and emitting the light to the outside, wherein at least one of the line segments formed by the intersection of cross sections including an optic axis of the light-receiving lens and the second lens surface has a constant curvature, and at least one of the line segments formed by the intersection of cross sections including an optic axis of the light-receiving lens and the second lens surface may be a line segment having a changing curvature.

Description

High Efficiency Receiving Lens {HIGH EFFICIENCY RECEIVING LENS}

The present invention relates to a high-efficiency light-receiving lens that increases the efficiency of light incident at a wide angle.

Recently, the intelligent car and smart car fields require vehicles to proactively respond to unexpected situations. In other words, it is necessary to identify situations that threaten the safety of drivers and pedestrians in advance, such as recognizing the sudden appearance of a pedestrian, detecting obstacles in advance beyond the range of lighting at night, detecting obstacles due to weakened headlights in rainy weather, or detecting road damage in advance.

For these needs, a scanner is installed on the windshield or the front of the vehicle, and when the vehicle is moving, it detects an object in front based on its own light and warns the driver in advance, and transmits an image that serves as the basis for the vehicle to stop or avoid the accident to the electronic control unit (ECU) of the vehicle, and the ECU uses this image to perform various controls. The device that acquires this image is called a scanner.

As a conventional scanner, radar (radio detection and ranging; RADAR) equipment was used. Radar is a wireless surveillance device that fires electromagnetic waves of the order of microwaves (ultra-short waves, wavelength of 10 cm to 100 cm) at an object and receives the electromagnetic waves reflected from the object to determine the distance, direction, altitude, etc. to the object. It is used in vehicle scanners, but because it is expensive, there is a problem that it is not easy to distribute to various vehicle types.

To solve this problem, scanners using light detection and ranging (LiDAR) are being developed. LiDAR is a device that fires pulsed laser light into the atmosphere and measures distances or atmospheric phenomena using its reflectors or scatterers. It is also called laser radar.

In the case of lidar, the equipped sensor must reliably receive signals incident from various directions, that is, from a wide angle. Specifically, vehicle lidar needs to increase the efficiency of light incident at a wide angle corresponding to a range of about +70 degrees to -70 degrees in the X-axis and about +3.4 degrees to -3.4 degrees in the Y-axis at all angles included in the range.

In the past, a coaxial method was used in which the light emitting part and the light receiving part were moved together by a motor to receive a certain level of all light signals incident at a wide angle as above.

However, this motor method has the problem that it increases the manufacturing cost due to synchronization of the light emitting part and the light receiving part, addition of the motor, etc., and also increases the overall size of the module. In addition, if the light emitting part and the light receiving part use the same cover lens, there is the problem that it is difficult to secure the performance of the light receiving part due to diffuse reflection.

An object of the present invention is to provide a high-efficiency light-receiving lens capable of increasing the efficiency of light incident at a wide angle to a certain level or higher.

Another object of the present invention is to provide a high-efficiency light-receiving lens in which light passing through a defocusing type lens has a constant area on the sensor surface, so that light efficiency is maintained at a certain level or higher even when the incident angle increases.

Another object of the present invention is to provide a high-efficiency light-receiving lens suitable for a sensor that reacts to a light amount above a certain level by having a defocusing lens in which the rate of change in the amount of light passing through is not large even when the angle of incidence of the light changes.

In order to solve the technical problem as described above, a light receiving lens module according to an embodiment of the present invention includes a light receiving lens having a first lens surface for receiving light from the outside, and a second lens surface for changing an optical path of light received by the first lens surface and emitting the light to the outside, and at least one of the line segments formed by the intersection of cross sections including the optic axis of the light receiving lens and the second lens surface has a constant curvature, and at least one of the line segments formed by the intersection of cross sections including the optic axis of the light receiving lens and the second lens surface may be a line segment having a changing curvature.

In an embodiment, at least one of the line segments formed by the intersection of the cross-sections including the optical axis of the light-receiving lens and the first lens surface may have a constant curvature.

In an embodiment, the present invention further includes a sensor that detects light that is incident from the outside onto the light-receiving lens and sequentially passes through the first lens surface and the second lens surface, and defocuses the light that reaches the light-receiving lens so that it reaches the sensing area of the sensor in a form having a constant area.

In an embodiment, the constant area may be variable depending on at least one of an incident angle of the X-axis with respect to the first lens surface and an incident angle of the Y-axis with respect to the first lens surface.

In an embodiment, the incident angle along the X-axis may range from +70 degrees to -70 degrees.

In an embodiment, the incident angle along the Y-axis may range from +4 degrees to -4 degrees.

In an embodiment, light that sequentially passes through the first lens surface and the second lens surface can reach a location further from the center of the sensor as at least one of an incident angle along the X axis with respect to the first lens surface and an incident angle along the Y axis with respect to the first lens surface increases through the defocusing.

In an embodiment, the sensor may be disposed on the optical axis.

In an embodiment, the light-receiving lens may have a positive (+) refractive index.

In an embodiment, a separate lens or structure positioned between the sensor and the second lens surface may be further included to increase the efficiency of light incident on the sensor.

In an embodiment, the device may further include at least one connecting portion formed on a surface connecting the first lens surface and the second lens surface to physically connect the light-receiving lens and the light-receiving unit.

In an embodiment, each of the at least one connecting portion may include at least one protrusion.

In order to solve the technical problem described above, according to another embodiment of the present invention, a light receiving lens including a first lens surface and a second lens surface for allowing light incident from the outside to reach a sensor is provided, wherein an optical axis extending in the height direction of the light receiving lens is defined as a Z-axis, an axis perpendicular to the Z-axis, penetrating a point on the Z-axis to form an intersection, and an axis extending in the longitudinal direction of the lens is defined as an X-axis, an axis perpendicular to the X-axis and the Z-axis, penetrating the intersection of the X-axis and the Z-axis, and extending in the width direction of the lens is defined as a Y-axis, and a virtual plane including the X-axis and the Z-axis is defined as a first virtual plane, and a virtual plane including the Y-axis and the Z-axis is defined as a second virtual plane, wherein the curvature of a line segment formed when the first virtual plane meets the first lens surface is constant, the curvature of a line segment formed when the second virtual plane meets the first lens surface is constant, the curvature of a line segment formed when the first virtual plane meets the second lens surface is constant, and the second virtual plane is defined as a The curvature of the line segment formed when meeting the second lens surface may not be constant.

The effects of the high-efficiency light-receiving lens according to the present invention are described as follows.

According to at least one of the embodiments of the present invention, the efficiency of light incident at a wide angle can be increased to a certain level or more.

In addition, according to at least one of the embodiments of the present invention, light passing through a lens of a defocusing type has a constant area on the sensor surface, so that light efficiency can be maintained at a constant level or higher even if the incident angle increases.

In addition, according to at least one of the embodiments of the present invention, a defocusing lens is provided in which the rate of change in the amount of light passing through is not large even when the angle of incidence of the light changes, so that it can be suitable for a sensor that reacts to a certain level or more of light.

Figure 1 is a drawing showing an example of receiving light incident at a wide angle corresponding to a range of about +70 degrees to -70 degrees in the X-axis and a range of about +3.4 degrees to -3.4 degrees in the Y-axis in a vehicle lidar.
FIG. 2 is a drawing showing a first cross-section of a high-efficiency light-receiving lens according to an embodiment of the present invention.
FIG. 3 is a drawing showing a second cross-section of a high-efficiency light-receiving lens according to an embodiment of the present invention.
FIG. 4 is a drawing showing an example in which the incident angle of light incident on a high-efficiency light-receiving lens according to an embodiment of the present invention increases and moves away from the center of the sensor surface.
FIG. 5 is a drawing showing an example in which light incident on a high-efficiency light-receiving lens according to an embodiment of the present invention is defocused so that an area located on the sensor surface moves away from the center of the sensor surface depending on the incident angle.
FIG. 6 is a drawing showing an example of adding another lens or mechanism between a high-efficiency light-receiving lens and a sensor according to an embodiment of the present invention to increase the efficiency of light incident on the sensor.
FIGS. 7 to 10 are drawings showing examples of actually implementing a high-efficiency light-receiving lens according to an embodiment of the present invention.

Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Regardless of the drawing symbols, identical or similar components will be given the same reference numerals and redundant descriptions thereof will be omitted. The suffixes "module" and "part" used for components in the following description are assigned or used interchangeably only for the convenience of writing the specification, and do not have distinct meanings or roles in themselves. In addition, when describing embodiments disclosed in this specification, if it is determined that a specific description of a related known technology may obscure the gist of the embodiments disclosed in this specification, the detailed description thereof will be omitted. In addition, the attached drawings are only intended to facilitate easy understanding of the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the attached drawings, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and technical scope of the present invention.

Terms that include ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by the terms. The terms are used only to distinguish one component from another.

When it is said that a component is "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components in between. On the other hand, when it is said that a component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

Singular expressions include plural expressions unless the context clearly indicates otherwise.

In this application, it should be understood that terms such as “comprises” or “has” are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

Figure 1 is a drawing showing an example of receiving light incident at a wide angle corresponding to a range of about +70 degrees to -70 degrees in the X-axis and a range of about +3.4 degrees to -3.4 degrees in the Y-axis in a vehicle lidar.

As explained above, in the field of intelligent cars and smart cars, distance recognition sensors or motion recognition sensors must receive signals from various directions, that is, from a wide angle, in order for the vehicle to actively respond to unexpected situations.

As illustrated in FIG. 1, the light receiving unit (110) equipped on a lidar mounted on a vehicle must receive light incident at a wide angle corresponding to a range (120) of about +70 degrees to -70 degrees in the X-axis and a range (130) of about +3.4 degrees to -3.4 degrees in the Y-axis, relatively consistently at all angles included in the range.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit and essential characteristics of the present invention.

However, the high-efficiency light-receiving lens described through the following FIGS. 2 to 6 only shows the necessary components for introducing the characteristic functions according to the present invention, and it is obvious to a person having ordinary skill in the art to which the present invention pertains that various other components may be included in the high-efficiency light-receiving lens.

FIG. 2 is a drawing showing a first cross-section of a high-efficiency light-receiving lens according to an embodiment of the present invention.

Referring to FIG. 2, a high-efficiency light-receiving lens (200) may include a first lens surface (201) and a second lens surface (202).

As illustrated in FIG. 2, in the first cross-section (in one embodiment, a cross-section formed by a cross-section parallel to a plane formed by the X-axis and the Z-axis), the first lens surface (201) may have a convex shape in the direction of the light source (or subject), and the second lens surface (202) may have a concave shape in the direction of the sensor (240) or a convex shape in the direction of the light source (or subject).

Here, the first lens surface (201) in the first cross-section may have a hemispherical shape. More specifically, the hemispherical shape of the first lens surface (202) may be described. Among the line segments formed when the cross-sections including the optic axis of the high-efficiency light-receiving lens (200) and the first lens surface meet, at least one line segment may have a constant curvature.

Here, the optical axis may be a path of light that does not cause refraction, or in other words, may mean an axis that does not cause optical difference even when a high-efficiency light-receiving lens (200) is rotated.

Meanwhile, the first lens surface (201) in the first cross-section can substantially uniformly receive the amount of light incident at all angles within a range of up to +70 degrees to -70 degrees in the X-axis direction due to its hemispherical shape.

Additionally, the high-efficiency light-receiving lens (200) according to the present invention may have a positive (+) refractive index.

Meanwhile, the sensor (240) may be positioned at the bottom of the second lens surface (202). Specifically, it is preferable to be positioned at the center of a hemisphere or semicircle shape, which is the shape of the first lens surface (201) or the second lens surface (202) in the first cross section. The center of the hemisphere or semicircle shape may be the center of the sphere or circle formed when a given hemisphere or semicircle is extended to form a complete sphere or circle. Then, the center of the sensor (240) may be placed at the center of the hemisphere or semicircle shape. In addition, the sensor (240) may be placed spaced apart from the center of the hemisphere or semicircle shape downward (in the -Z-axis direction on FIG. 2).

And, as a specific example, the length (210) in the X-axis direction of the high-efficiency light-receiving lens (200) according to the present invention can be 43.8 mm, and the radius length (220) of the hemispherical shape, which is the distance from the center of the hemispherical shape to the first lens surface (201), can be 21.9 mm, which is half of 43.8 mm. In addition, the sensor (240) can be arranged to be spaced apart from the center of the hemispherical shape by about 2 to 5 mm downward (in the -Z-axis direction in FIG. 2).

Meanwhile, the ratio of the cut length of the high-efficiency light-receiving lens (200) through the first cross-section, specifically, the ratio of the radius length (220) of the hemispherical shape and the length (210) in the X-axis direction of the light-receiving lens (200), can be variously changed within a range satisfying 1:21.9. Specifically, it is preferable that the cut length ratio be included in the range of 1:25 to 1:35.

And, if the thickness (230 of FIG. 3), the radius length (220) or diameter (210) of the first lens surface of the high-efficiency light-receiving lens (200) according to the present invention increases, or the total surface area of the lens increases, the total amount of light received by the lens will increase, and accordingly, it is desirable for the diameter (D) of the sensor that detects the incident light to also increase.

FIG. 3 is a drawing showing a second cross-section of a high-efficiency light-receiving lens according to an embodiment of the present invention.

Referring to FIG. 3, in the second cross-section (in one embodiment, a cross-section formed by a cross-section parallel to a plane formed by the Y-axis and the Z-axis), the first lens surface (201) may have a spherical shape, and the second lens surface (202) may have an aspherical shape.

To explain more specifically the aspherical shape of the second lens surface (202), at least one of the line segments formed by the intersection of the cross sections including the optical axis of the light-receiving lens (200) and the second lens surface may have a constant curvature. In addition, at least one of the line segments formed by the intersection of the cross sections including the optical axis of the light-receiving lens (200) and the second lens surface may have a non-constant curvature.

Meanwhile, the second lens surface (202) in the second cross-section can increase the efficiency of light incident at an angle of +4 degrees to -4 degrees in the Y-axis direction due to its aspherical shape.

Here, the second lens surface (202) can defocus the light that has passed through the first lens surface (201) through the aspherical shape and output it in the direction where the sensor (240) is located.

Specifically, in the high-efficiency light-receiving lens (200) according to the present invention, light that sequentially passes through the first lens surface (201) and the second lens surface (202) reaches the sensing area of the sensor (240) in a form having a certain area through defocusing caused by the aspherical shape of the second lens surface (202) described above, as illustrated in FIG. 3.

And, as a specific example, in the shape of the first lens surface (201) in the second cross-section of the high-efficiency light-receiving lens (200) according to the present invention, which is a spherical shape, the thickness (230) of the first lens surface (201) can be 26.5 mm.

Meanwhile, a constant area reaching the sensing area of the sensor (240) by defocusing can be varied depending on at least one of the incident angle of the X-axis to the first lens surface (201) and the incident angle of the Y-axis to the first lens surface.

Here, the incident angle of the X-axis is preferably within a range of +70 degrees to -70 degrees, and the incident angle of the Y-axis is preferably within a range of +4 degrees to -4 degrees. A detailed description thereof will continue with reference to FIGS. 4 and 5 below.

FIG. 4 is a drawing showing an example in which the incident angle of light incident on a high-efficiency light-receiving lens according to an embodiment of the present invention increases and moves away from the center of the sensor surface.

Referring to FIG. 4, it can be confirmed that among the incident angles of light incident on the high-efficiency light-receiving lens (200) according to the present invention, the incident angle of the Y axis with respect to the first lens surface (201) sequentially increases to 0 degrees, 1.7 degrees, and 3.4 degrees.

Through defocusing caused by the aspherical shape of the second lens surface (202) described above, an example (A) can be confirmed in which light passing through the second lens surface (202) reaches a location that is sequentially farther away from the center of the sensor (410).

FIG. 5 is a drawing showing an example in which light incident on a high-efficiency light-receiving lens according to an embodiment of the present invention is defocused so that an area located on the sensor surface moves away from the center of the sensor surface depending on the incident angle.

Referring to FIG. 5, in a high-efficiency light-receiving lens according to the present invention, when the incident angle of the Y axis for the first lens surface increases from 0 degrees to 3.4 degrees, it can be confirmed that light passing through the second lens surface reaches a location further from the center (B) of the sensor surface (410) through defocusing caused by the aspherical shape of the second lens surface.

As a result, it can be confirmed that a certain area where light passing through the second lens surface reaches the sensing area of the sensor (240) varies depending on at least one of the incident angles of the X-axis to the first lens surface and the incident angles of the Y-axis to the first lens surface.

For example, if a lens is formed of polymethylmethacrylate (PMMA), and a light source can move in a range of +70 degrees to -70 degrees in the X-axis and in a range of +4 degrees to -4 degrees in the Y-axis at a distance of 30 m from the sensor, and can output light corresponding to a power of 1 W, and the diameter of the sensing surface (410) of the sensor is 2 mm, the amount of light incident on the sensor can be 3 nW or more.

At this time, when the incident angle is 0 degrees, the diameter of a constant area of light passing through the second lens surface located at the sensor surface (410) can be approximately 2.2 mm, and when the incident angle is 3.4 degrees, the diameter of a constant area of light passing through the second lens surface located at the sensor surface (410) can be approximately 2.1 mm.

That is, if the diameter of the sensor surface (410) of the sensor is about 2 mm, when the incident angle is 0 degrees, the light passing through the second lens surface reaches the sensor surface (410) with an area ratio of about 90%, and when the incident angle is 3.4 degrees, the light passing through the second lens surface reaches the sensor surface (410) with an area ratio of about 60%.

Various examples of the incident angle along the X-axis to the first lens surface and the incident angle along the Y-axis to the first lens surface related thereto are as shown in Table 1 below.

Meanwhile, various embodiments of the present invention using a high-efficiency light-receiving lens and a case without a lens in the specific examples above are as shown in Table 2 below.

That is, a lens that causes defocusing is suitable for a sensor that responds to a certain level of light since the rate of change in the amount of light is not large even when the angle of incidence of light changes, as shown in Tables 1 and 2.

FIG. 6 is a drawing showing an example of adding another lens or mechanism between a high-efficiency light-receiving lens and a sensor according to an embodiment of the present invention to increase the efficiency of light incident on the sensor.

Referring to FIG. 6, as described above, the sensor (640) may be located at the lower center of the high-efficiency light-receiving lens (600) according to the present invention. Here, a separate lens or optical device (650) may be additionally placed between the lens (600) and the sensor (640) to increase light efficiency.

Specifically, FIG. 6 shows an example in which a hemispherical lens (650) is placed between a lens (600) and a sensor (640).

Various examples of the specific examples according to Tables 1 and 2 above, in which only the high-efficiency light-receiving lens according to the present invention is used and in which a hemispherical lens is additionally used, are as shown in Table 3 below.

That is, when a hemispherical lens (650) made of PMMA is positioned on top of the sensor (640), the amount of light incident on the sensor (640) increases as shown in Table 3. Specifically, when the radius of the hemispherical lens (650) is about 2.2 mm, it can be confirmed that the light efficiency increases by about twice as much as the light efficiency when there is no hemispherical lens (650) (Ref.).

Meanwhile, the sensor (640) illustrated in FIG. 6 may also be positioned approximately 2 to 5 mm downward (in the -Z-axis direction in FIG. 2) from the center of the hemispherical shape as described above.

FIGS. 7 to 10 are drawings showing examples of actually implementing a high-efficiency light-receiving lens according to an embodiment of the present invention.

First, referring to FIG. 7, the first cross-section of FIG. 2 described above can be confirmed more specifically. Specifically, the high-efficiency light-receiving lens illustrated in FIG. 7 may include a plurality of protrusions (710) on the surface (703) connecting the first lens surface (701) and the second lens surface (702).

Here, the plurality of protrusions (710) are configured to enable the high-efficiency light-receiving lens according to the present invention to be physically connected to a light-receiving unit equipped with a sensor, and as illustrated in FIG. 7, can be positioned at a position spaced apart from the end of the first lens surface (701) by about 5.8 mm on the first cross-section.

Next, referring to Fig. 8, the second cross-section of Fig. 3 described above can be confirmed more specifically.

As illustrated in FIG. 8, a plurality of protrusions (710) may be arranged at a position spaced apart from the end of the first lens surface (701) by about 5.2 mm in the second cross-section. In addition, the thickness of the plurality of protrusions (710) may be about 4-Ø3 mm, and the length by which the plurality of protrusions (710) protrude from the surface (703) connecting the first lens surface (701) and the second lens surface (702) may be about 3.5 mm.

Meanwhile, the distance between the first lens surface (701) and the second lens surface (702) on the optical axis can be about 14 mm, and the radius length of the hemispherical shape, which is the distance from the center of the hemispherical shape to the first lens surface (701), can be about 21.9 mm as described above.

Next, referring to FIG. 9, one can more specifically identify a surface (703) connecting the first lens surface (701) and the second lens surface (702) mentioned above through FIGS. 7 and 8, among the multiple surfaces forming the high-efficiency light-receiving lens according to the present invention.

As illustrated in FIG. 9, a high-efficiency light-receiving lens according to the present invention may include four protrusions (710), two on each of the left and right sides, on a surface (703) connecting the first lens surface (701) and the second lens surface (702), and the high-efficiency light-receiving lens may be physically connected to a light-receiving unit through the four protrusions (710).

Meanwhile, the length in the X-axis (X-axis in FIG. 2) direction of the high-efficiency light-receiving lens according to the present invention can be about 43.8 mm as described above in FIG. 2, and the thickness of the first lens surface (701) provided in the high-efficiency light-receiving lens can be about 26.5 mm as described above in FIG. 3.

Finally, referring to FIG. 10, the three-dimensional shape of the high-efficiency light-receiving lens according to the present invention, which has been described in two dimensions through FIGS. 7 to 9, can be confirmed.

Specifically, it is preferable that the actual implementation examples of the high-efficiency light-receiving lens described through FIGS. 7 to 10 satisfy the numerical values described in Tables 4 and 5 below and the mathematical expression 1. Here, S1 and S2 represent the first lens surface (701) which is a spherical surface and the second lens surface (702) which is an aspherical surface.

Here, the coating of the second lens surface (702) enables the high-efficiency light-receiving lens according to the present invention to perform a band pass filter function to detect only a preset wavelength.

Mathematical formula 1 represents the aspheric formula. Here, R can be -19.1922037933, K can be 0, B4 can be 0.0001549820, B6 can be 3.6450096648e-8, and B10, B12, and B14 can be 0.

Referring to FIGS. 7 to 10, the high-efficiency light-receiving lens according to the present invention can be described more specifically as follows.

First, an optical axis extending in the height direction of the high-efficiency light-receiving lens is referred to as the Z-axis (for example, the Z-axis in FIG. 2), an axis that is perpendicular to the Z-axis, passes through a point on the Z-axis, forms an intersection, and is extended in the length direction of the high-efficiency light-receiving lens is referred to as the X-axis (for example, the X-axis in FIG. 2), an axis that is perpendicular to the X-axis and the Z-axis, passes through the intersection of the X-axis and the Z-axis, and is extended in the width direction of the high-efficiency light-receiving lens is referred to as the Y-axis (for example, the Y-axis in FIG. 2), and an imaginary plane that includes the X-axis and the Z-axis is referred to as a first virtual plane (for example, the first cross-section in FIG. 2), and an imaginary plane that includes the Y-axis and the Z-axis is referred to as a second virtual plane (for example, the second cross-section in FIG. 3).

At this time, as illustrated in FIGS. 7 to 10, the curvature of the line segment formed when the first virtual plane meets the first lens surface of the high-efficiency light-receiving lens may be constant, and the curvature of the line segment formed when the second virtual plane meets the first lens surface of the high-efficiency light-receiving lens may be constant.

And, the curvature of the line segment formed when the first virtual plane meets the second lens surface of the high-efficiency light-receiving lens may be constant, and the curvature of the line segment formed when the second virtual plane meets the second lens surface of the high-efficiency light-receiving lens may not be constant.

Meanwhile, the shapes or numbers of the plurality of protrusions (710) illustrated in FIGS. 7 to 10 are specific examples of connecting the high-efficiency light-receiving lens and the light-receiving unit according to the present invention, and it is not excluded that protrusions of different shapes or different numbers may be included in the high-efficiency light-receiving lens according to the present invention.

Ultimately, the high-efficiency light-receiving lens according to the present invention can increase the efficiency of light incident at all angles of a wide angle to a certain level or higher by using only a lens without a mechanical configuration such as a motor, and since the light passing through the lens through the defocusing type lens has a certain area on the sensor surface, the light efficiency can be maintained to a certain level or higher even if the incident angle increases, and therefore, it can be suitable for a sensor that responds to a certain level or higher of light.

The above detailed description should not be construed as restrictive in all respects but should be considered as illustrative. The scope of the invention should be determined by a reasonable interpretation of the appended claims, and all changes coming within the equivalent scope of the invention are intended to be embraced therein.

Claims (13)

A light receiving lens having a first lens surface that receives light from the outside and a second lens surface that changes the optical path of the light received by the first lens surface and emits it to the outside;
It includes a sensor that detects light that is incident from the outside onto the light-receiving lens and sequentially passes through the first lens surface and the second lens surface,
The above first lens surface is a spherical surface, and the above second lens surface is an aspherical surface.
Defocusing the light reaching the above light receiving lens so that it reaches the sensing area of the sensor in a form having a certain area,
A light-receiving lens module in which the second lens surface has an aspherical shape in a first direction perpendicular to the optical axis and a spherical shape in a second direction perpendicular to the optical axis and the first direction.

In the first paragraph,
The above constant area is,
It is variable depending on at least one of the incident angles of the X-axis to the first lens surface and the incident angle of the Y-axis to the first lens surface.
A light receiving lens module in which the X-axis is an axis extending in the longitudinal direction of the light receiving lens, and the Y-axis is an axis extending in the width direction of the light receiving lens.
In the first paragraph,
The light that sequentially passes through the first lens surface and the second lens surface is
Through the above defocusing, as at least one of the incident angles of the X-axis to the first lens surface and the incident angles of the Y-axis to the first lens surface increases, a position further from the center of the sensor is reached,
A light receiving lens module in which the X-axis is an axis extending in the longitudinal direction of the light receiving lens, and the Y-axis is an axis extending in the width direction of the light receiving lens.
delete In the first paragraph,
A light receiving lens module positioned between the sensor and the second lens surface and including a separate lens or structure that increases the efficiency of light incident on the sensor.
In the first paragraph,
A light-receiving lens module further comprising at least one connecting portion formed on a surface connecting the first lens surface and the second lens surface, and physically connecting the light-receiving lens and the light-receiving unit.
In Article 6,
Each of the above at least one connecting portion,
A photodetector lens module comprising at least one protrusion.
A lidar comprising a light-receiving lens module according to any one of claims 1 to 3 and claims 5 to 7. delete delete delete delete delete

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