KR20180016149A - High efficiency receiving lens - Google Patents

Abstract

According to an embodiment of the present invention, a high efficiency light receiving lens comprises a light receiving lens having a first lens surface receiving light from the outside and a second lens surface changing a light path of the light received by the first lens surface to be discharged to the outside. Moreover, at least one of segments formed as the second lens surface meets cross section surfaces having an optic axis of the light receiving lens has predetermined a curvature, and at least one of segments formed as the second lens surface meets cross section surfaces having an optic axis of the light receiving lens may be a segment of which a curvature is changed.

Description

[0001] HIGH EFFICIENCY RECEIVING LENS [0002]

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

In recent years, intelligent automobiles and smart cars are demanding the active coping function of the vehicle against unexpected situations. That is, it is possible to recognize the sudden appearance of pedestrians, to detect an obstacle ahead of the range of illumination in the dark at night, to detect an obstacle due to weakening of headlight illumination during rain, And situations that threaten the safety of pedestrians.

In response to such a demand, a windshield or a vehicle installed in front of the vehicle to detect an object ahead of the vehicle when the vehicle is moving based on the self-emitted light, not only warns the driver in advance, The image is transmitted to an electronic control unit (ECU) of the vehicle, and the ECU performs various controls by using the image. Such an image is called a scanner.

As a conventional scanner, a radio detection and ranging (RADAR) apparatus was used. A radar is a radio monitoring device that emits electromagnetic waves of a microwave (microwave, 10 cm to 100 cm wavelength) to an object, receives electromagnetic waves reflected from the object, and finds distance, direction, altitude, etc. with the object. However, since the price is high, it is not easy to supply to various types of vehicles.

In order to solve such a problem, a scanner using light detection and ranging (LiDAR) is being developed. Lidar is a device that measures the distance or atmospheric phenomenon by emitting pulsed laser light into the atmosphere and using the reflector or scatterer, and is also called a laser radar.

In the case of the lidar, the sensor provided must stably receive a signal incident in various directions, that is, at a wide angle. Specifically, the efficiency of light incident at a wide wide angle in the range of about +70 degrees to -70 degrees in the X axis and in the range of about +3.4 degrees to -3.4 degrees in the Y axis for the in-vehicle Lada is measured at all angles There is a need to increase it.

Conventionally, a coaxial method has been used in which a light emitting portion and a light receiving portion are moved together through a motor in order to receive signals of all lights incident at a wide angle as described above.

However, such a motor system has a problem that the manufacturing cost is increased due to the synchronization of the light emitting unit and the light receiving unit and the addition of a motor, and the overall size of the module is also increased. Further, when the same cover lens is used for the light emitting portion and the light receiving portion, it is difficult to secure the performance of the light receiving portion by irregular reflection.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a high-efficiency light receiving lens capable of increasing the efficiency of light incident at a wide angle.

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

Another object of the present invention is to provide a high-efficiency light receiving lens equipped with a defocusing lens having a small rate of change in the amount of light passing therethrough even when the incident angle of light changes, and is suitable for a sensor responsive to a light quantity exceeding a certain level.

According to an aspect of the present invention, there is provided a light receiving lens module including a first lens surface that receives light from the outside, and a second lens surface that changes an optical path of the light received by the first lens surface, Wherein at least one line segment among the cross sections including the optical axis of the light receiving lens and the line segments formed by the second lens surface are formed to have a constant curvature And at least one line segment among the cross-sections including the optical axis of the light receiving lens and the line segments formed by the second lens surface may be a line segment whose curvature changes.

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

In an embodiment of the present invention, it further includes a sensor for detecting light that is incident on the light receiving lens from the outside and sequentially passed through the first lens surface and the second lens surface, and the light reaching the light receiving lens is defocused , It is possible to reach the sensing area of the sensor in a form having a constant area.

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

In an embodiment, the angle of incidence of the X-axis may range up to +70 degrees to -70 degrees.

In an embodiment, the angle of incidence of the Y-axis may range up to +4 degrees to -4 degrees.

In one embodiment of the present invention, the light sequentially passing through the first lens surface and the second lens surface passes through the defocusing, the incident angle of the X-axis with respect to the first lens surface, and the Y As the incident angle of at least one of the incident angles of the axes increases, it can reach a position away from the center of the sensor.

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, the sensor may further include a separate lens or structure located between the sensor and the second lens surface to increase the efficiency of light incident on the sensor.

The optical pickup apparatus may further include at least one connection 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 portion.

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

According to another aspect of the present invention, there is provided a light receiving lens including a first lens surface and a second lens surface for allowing light incident from the outside to reach the sensor, Axis, a crossing point passing through a point on the Z-axis and perpendicular to the Z-axis, an axis extending in the longitudinal direction of the lens is perpendicular to the X-axis, the X-axis and the Z-axis, An imaginary plane passing through an intersection between the X axis and the Z axis and extending in the width direction of the lens is defined as a Y axis, a virtual plane including the X axis and the Z axis as a first virtual plane, and a virtual plane including the Y axis and the Z axis Wherein a curvature of a line segment formed by the first virtual plane with the first lens surface is constant and a curvature of a line segment formed by the second virtual plane with the first lens surface is defined as a second virtual plane, And the first virtual plane The curvature of this line segment and the second lens surface and the curvature of the line segment which is formed to meet the schedule, and the second imaginary plane which is formed to meet with the second lens surface may not be uniform.

The effect of the high-efficiency light receiving lens according to the present invention will be 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 beyond a certain level.

In addition, according to at least one embodiment of the present invention, the light passing through the lens through the defocusing lens has a certain area on the sensor surface, and even if the incident angle is increased, .

According to at least one of the embodiments of the present invention, a defocusing lens having a large rate of change of the amount of light passing therethrough is provided even when the angle of incidence of light is changed.

1 is a view showing an example of receiving light incident at a wide wide angle in a range of about +70 degrees to -70 degrees in the X axis and in a range of about +3.4 degrees to -3.4 degrees in the Y axis in the case of a vehicle.
2 is a view showing a first cross-section of a high-efficiency light receiving lens according to an embodiment of the present invention.
3 is a view showing a second cross-section of a high-efficiency light-receiving lens according to an embodiment of the present invention.
FIG. 4 is a view showing an example in which the distance from the center of the sensor surface is increased as the incident angle of light incident on the high-efficiency light receiving lens according to the embodiment of the present invention increases.
5 is a view showing an example in which the light incident on the high-efficiency light receiving lens according to the embodiment of the present invention is defocused and the area on the sensor surface is moved away from the center of the sensor surface according to the incident angle.
6 is a diagram showing an example in which another lens or a mechanism is added between the high-efficiency light-receiving lens and the sensor according to the embodiment of the present invention in order to increase the light efficiency incident on the sensor.
FIGS. 7 to 10 are views showing an actual implementation of a high-efficiency light receiving lens according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

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

As described above, in the field of intelligent automobiles and smart cars, in order to actively cope with an unexpected situation of a vehicle, a distance recognition sensor or a motion recognition sensor must receive signals in various directions, i.e., a wide angle.

As shown in FIG. 1, the light receiving unit 110 provided on the lid mounted on the vehicle has a range of about +70 degrees to -70 degrees (120) in the X axis and a range of about +3.4 degrees to about -3.4 degrees Light incident at a wide angle corresponding to the light source 130 should be received relatively constantly 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 or essential characteristics thereof.

However, the high-efficiency light receiving lens described with reference to Figs. 2 to 6 below is merely showing necessary components in introducing the characteristic functions according to the present invention, and various other components are included in the high-efficiency light receiving lens It will be apparent to those skilled in the art that the present invention can be carried out without departing from the spirit and scope of the invention.

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

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

2, the first lens surface 201 is a light source (or a subject) in a first end surface (in an embodiment, a cross section formed by a cut surface parallel to the surface formed by the X-axis and the Z- And the second lens surface 202 may have a concave shape toward the sensor 240 or a convex shape toward the light source (or subject).

Here, the first lens surface 201 in the first cross section may have a hemispherical shape. At least one of the sections including the optic axis of the high-efficiency light receiving lens 200 and the line segments in which the first lens surface is formed by the contact is formed in the hemispherical shape, which is the shape of the first lens surface 202. [ The above line segments can have a constant curvature.

Here, the optical axis may be a path of light that does not cause refraction, and in other expressions may refer to an axis that does not cause an optical difference even if the high-efficiency light receiving lens 200 is rotated.

On the other hand, the first lens surface 201 in the first end face receives substantially uniformly the light amount of light incident at all angles included in the range of +70 degrees to -70 degrees in the X axis direction due to the hemisphere shape .

The high-efficiency light receiving lens 200 according to the present invention may have a positive refractive index.

On the other hand, the sensor 240 may be positioned at the lower end of the second lens surface 202. Specifically, it is preferable that the first lens surface 201 or the second lens surface 202 is located at the center of the hemispherical or semicircular shape in the first cross section. The center of a hemispheric or semi-circular shape may be the center of the sphere or circle when a given hemisphere or semicircle is extended to form a complete sphere or circle. Then, the center of the sensor 240 may be disposed at the center of the hemispherical or semi-circular shape. Further, the sensor 240 may be disposed apart from the center of the hemispherical or semicircular shape (in the -Z-axis direction in Fig. 2).

In a specific embodiment, the length 210 in the X axis direction of the high-efficiency light receiving lens 200 according to the present invention may be 43.8 mm, and the length of the corresponding hemispherical lens 210, which is the distance from the center of the hemispherical shape to the first lens surface 201, The radius 220 of the shape may be 21.9 mm, which is half of 43.8 mm. Further, the sensor 240 may be disposed at a distance of about 2 to 5 mm from the center of the hemispherical shape to the lower side (the -Z-axis direction in Fig. 2).

The ratio of the cut length of the high efficiency light receiving lens 200 through the first end face, specifically, the hemispherical radius length 220 and the length 210 of the light receiving lens 200 in the X axis direction is 1: 21.9. ≪ / RTI > Specifically, the cut length ratio is preferably comprised between 1:25 and 1:35.

When the thickness (230 in FIG. 3) of the high-efficiency light receiving lens 200 according to the present invention, the radius length 220 or the diameter 210 of the first lens surface increases or the total surface area of the lens increases, It is preferable that the total amount of light is increased and the diameter D of the sensor for sensing incident light is also increased.

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

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

At least one of the line segments in which the cross section including the optical axis of the light receiving lens 200 and the second lens surface are formed is a curved line having a constant curvature Lt; / RTI > At the same time, at least one line segment of the line segments formed by the intersection of the optical axis of the light receiving lens 200 and the second lens surface may have a non-uniform curvature.

On the other hand, the second lens surface 202 in the second cross section can increase the efficiency of light incident at +4 degrees to -4 degrees in the Y axis direction due to the aspherical shape.

Here, the second lens surface 202 defocuses the light that has passed through the first lens surface 201 through the aspherical shape to output in a direction in which the sensor 240 is positioned.

Specifically, in the high-efficiency light-receiving lens 200 according to the present invention, the light sequentially passing through the first lens surface 201 and the second lens surface 202 passes through the above- And reaches the sensing area of the sensor 240 in a form having a constant area through the defocusing occurring in the aspherical shape of the surface 202.

In the spherical 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, the thickness 230 of the first lens surface 201 is 26.5 mm. < / RTI >

On the other hand, the constant area reaching the sensing area of the sensor 240 due to the defocusing is variable according to at least one incident angle of the X-axis incident angle with respect to the first lens surface 201 and the Y-axis incident angle with respect to the first lens surface .

Here, the X-axis incident angle is preferably included in the range of +70 degrees to -70 degrees, and the Y-axis incident angle is preferably included in the range of +4 degrees to -4 degrees. A detailed description thereof will be continued through FIGS. 4 and 5 below.

FIG. 4 is a view showing an example in which the distance from the center of the sensor surface is increased as the incident angle of light incident on the high-efficiency light receiving lens according to the embodiment of the present invention increases.

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

An example (A) in which light passing through the second lens surface 202 arrives at a position that is sequentially distant from the center of the sensor 410 through defocusing generated in the aspherical shape of the second lens surface 202, .

5 is a view showing an example in which the light incident on the high-efficiency light receiving lens according to the embodiment of the present invention is defocused and the area on the sensor surface is moved away from the center of the sensor surface according to the incident angle.

5, in the high-efficiency light receiving lens according to the present invention, when the incident angle of the Y-axis with respect to the first lens surface is increased by 3.4 degrees in comparison with the zero degree, by the defocusing occurring in the aspherical shape of the second lens surface, It can be confirmed that the light having passed through the two lens surfaces reaches a position away from the center B of the sensor surface 410.

As a result, the predetermined area where the light passing through the second lens surface reaches the sensing area of the sensor 240 is at least one of an incident angle of the X axis with respect to the first lens surface and an incident angle with respect to the Y axis of the first lens surface Accordingly, it can be confirmed that it is variable.

For example, if the lens is formed of polymethylmethacrylate (PMMA) and the light source is in the range of +70 degrees to -70 degrees in the X axis and +4 degrees to -4 degrees in the Y axis at a distance of 30 m from the sensor The light amount corresponding to the power of 1 W can be outputted while moving in the range of the degree of light. When 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.

In this case, when the incident angle is 0 degree, the diameter of a certain area of the light passing through the second lens surface located on the sensor surface 410 may be about 2.2 mm. When the incident angle is 3.4 degrees, The diameter of a certain area of the light passing through the second lens surface may be about 2.1 mm.

That is, if the diameter of the sensor surface 410 of the sensor is about 2 mm, if the incident angle is 0 degree, the light passing through the second lens surface reaches the sensor surface 410 with an area ratio of about 90% The light that has passed through the second lens surface reaches the sensor surface 410 with an area ratio of about 60%.

Various examples of the incident angle of the X-axis with respect to the first lens surface and the incident angle with respect to the Y-axis of the first lens surface are shown in Table 1 below.

Meanwhile, in the above concrete examples, various examples of the case using the high-efficiency light receiving lens according to the present invention and the case without the lens are shown in Table 2 below.

That is, even if the angle of incidence of the light changes, the lens that causes defocusing is suitable for a sensor that reacts at a certain amount of light amount or more because the rate of change of the light amount is not large as shown in Tables 1 and 2.

6 is a diagram showing an example in which another lens or a mechanism is added between the high-efficiency light-receiving lens and the sensor according to the embodiment of the present invention in order to increase the light efficiency incident on the sensor.

Referring to FIG. 6, as described above, the sensor 640 may be located at the bottom center of the high-efficiency light-receiving lens 600 according to the present invention. Here, another lens or optical device 650 may be additionally disposed between the lens 600 and the sensor 640 in order to increase the light efficiency.

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

Table 3 below shows various examples of the case where only the high-efficiency light receiving lens according to the present invention is used and the case where the hemispherical lens is additionally used in the specific example according to Table 1 and Table 2 above.

That is, when the hemispherical lens 650 made of PMMA is placed on the sensor 640, the amount of light incident on the sensor 640 increases as shown in Table 3. Specifically, when the hemispherical lens 650 has a radius of about 2.2 mm, it is confirmed that the optical efficiency is about twice as high as that of the hemispherical lens 650 (Ref.).

The sensor 640 shown in FIG. 6 may also be disposed at a distance of about 2 to 5 mm from the center of the hemispherical shape (in the -Z-axis direction in FIG. 2) as described above.

FIGS. 7 to 10 are views showing an actual implementation of a high-efficiency light receiving lens according to an embodiment of the present invention.

First, referring to FIG. 7, the first section of FIG. 2 described above can be confirmed in more detail. 7 may include a plurality of protrusions 710 on a surface 703 connecting the first lens surface 701 and the second lens surface 702. In this case,

7, the plurality of protruding portions 710 are configured to allow the high-efficiency light receiving lens according to the present invention to be physically connected to the light receiving portion provided with the sensor, At a distance of about 5.8 mm from the first cross section.

Next, referring to FIG. 8, the second section of FIG. 3 described above can be confirmed in more detail.

8, the plurality of projections 710 may be disposed at a position spaced apart from the end of the first lens surface 701 by about 5.2 mm on the second end face. The plurality of protrusions 710 may have a thickness of about 4-mm 3 mm and a plurality of protrusions 710 may be formed on the surface 703 connecting the first lens surface 701 and the second lens surface 702 The protruding length can be about 3.5 mm.

On the other hand, the distance between the first lens surface 701 and the second lens surface 702 on the optical axis may be about 14 mm, and the distance from the center of the hemispherical shape to the first lens surface 701 The radius length may be about 21.9 mm as described above.

Next, referring to FIG. 9, among the plurality of surfaces constituting the high-efficiency light receiving lens according to the present invention, the first lens surface 701 and the second lens surface 702, which are referred to with reference to FIGS. 7 and 8, The surface 703 can be confirmed more specifically.

9, the high-efficiency light-receiving lens according to the present invention has two surfaces 703 on the left and right sides of the first lens surface 701 and the second lens surface 702, And the high efficiency light receiving lens may be physically connected to the light receiving unit through the corresponding four protrusions 710. [

2, the length of the high-efficiency light receiving lens according to the present invention in the X-axis direction (X-axis direction in FIG. 2) may be about 43.8 mm as described above with reference to FIG. 2. The first lens surface 701, As shown in FIG. 3, may be about 26.5 mm.

Finally, referring to FIG. 10, the three-dimensional shape of the high-efficiency light receiving lens according to the present invention, which is two-dimensionally illustrated through FIGS. 7 to 9, can be confirmed.

Specifically, an actual implementation example of the high-efficiency light receiving lens described with reference to Figs. 7 to 10 preferably satisfies the numerical values shown in Tables 4 and 5 and Equation (1). Here, S1 and S2 denote a spherical first lens surface 701 and an aspherical second lens surface 702, respectively.

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

Equation (1) represents an aspheric surface expression. Where 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 zero.

7 to 10, the high-efficiency light receiving lens according to the present invention will be described in more detail as follows.

First, the optical axis extending in the height direction of the high-efficiency light-receiving lens is referred to as a Z-axis (for example, the Z-axis in FIG. 2), an intersection is formed through the point perpendicular to the Z- The axis extended in the longitudinal direction is referred to as an X axis (for example, the X axis in FIG. 2), and an axis extending perpendicularly to the X axis and the Z axis and passing through an intersection between the X axis and the Z axis and extending in the width direction of the high- Axis and a virtual plane including 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 a virtual plane including the Z axis is defined as a second virtual plane (e.g., the second cross section in Fig. 3).

7 to 10, the curvature of the line segment formed by the first virtual plane and the first lens surface of the high-efficiency light receiving lens may be constant, and the second virtual plane may be the first The curvature of the line segment formed with the lens surface may be constant.

The curvature of the line segment formed by the first virtual plane and the second lens surface of the high-efficiency light receiving lens can be constant, and the curvature of the line segment formed by the second virtual plane is formed with the second lens surface of the high- I may not

Meanwhile, the shape or the number of the plurality of protrusions 710 shown in FIGS. 7 to 10 is a concrete example connecting the high-efficiency light-receiving lens according to the present invention to the light-receiving unit, The present invention is not limited to the above.

As a result, the high-efficiency light-receiving lens according to the present invention can increase the efficiency of light entering from all angles of the wide angle to a certain level or more by using only a lens without a mechanical structure like a motor, The light passing through the lens has a constant area on the sensor surface and the light efficiency can be maintained above a certain level even if the incident angle is increased.

The foregoing detailed description should not be construed in any way as being restrictive and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

Claims (13)

A first lens surface that receives light from the outside; And
And a second lens surface that changes an optical path of the light received by the first lens surface and emits the light to the outside,
Wherein at least one line segment of cross sections including the optic axis of the light receiving lens and line segments formed by the second lens surface meet have a constant curvature,
Wherein at least one of the line segments including the optical axis of the light receiving lens and the line segments formed by the second lens surface is a line segment whose curvature is changed.
The method according to claim 1,
Wherein at least one of the line segments including the optical axis of the light receiving lens and the line segments formed by the first lens surface meet has a constant curvature.
The method according to claim 1,
Further comprising: a sensor for sensing light sequentially incident on the first lens surface and the second lens surface, which is incident from the outside to the light receiving lens,
Wherein the light receiving lens module defocuses the light reaching the light receiving lens so as to reach a sensing area of the sensor with a predetermined area.
The method of claim 3,
The above-
Axis, the incident angle of the X-axis with respect to the first lens surface, and the angle of incidence of the Y-axis with respect to the first lens surface.
5. The method of claim 4,
The incident angle of the X-
And a range of up to +70 degrees to -70 degrees.
The method of claim 3,
The incident angle of the Y-
And a maximum range of +4 degrees to -4 degrees.
The method of claim 3,
Wherein light passing through the first lens surface and the second lens surface sequentially passes through the first lens surface,
A light receiving lens that reaches a position away from the center of the sensor through 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, module.
The method of claim 3,
The sensor includes:
And is disposed on the optical axis.
3. The method of claim 2,
Wherein the light receiving lens has a positive refractive index.
The method of claim 3,
Further comprising a separate lens or structure located between the sensor and the second lens surface to increase the efficiency of light incident on the sensor.
The method according to claim 1,
And at least one connection 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 portion.
12. The method of claim 11,
Wherein each of the at least one connecting portion comprises:
And at least one protrusion.
A light receiving lens comprising a first lens surface and a second lens surface for allowing light incident from the outside to reach the sensor,
An optical axis extending in a height direction of the light receiving lens is defined as a Z-axis, an intersection is formed through the point on the Z-axis perpendicular to the Z-axis, and an axis extended in the longitudinal direction of the lens is defined as an X- A Y-axis extending perpendicularly to the axis and extending in the width direction of the lens through an intersection between the X-axis and the Z-axis, a virtual plane including the X-axis and the Z-axis being a first virtual plane, and a Y- Is defined as a second virtual plane,
Wherein a curvature of a line segment formed by the first virtual plane and the first lens surface is constant,
Wherein a curvature of a line segment formed by the second virtual plane with the first lens surface is constant,
The curvature of a line segment formed by the first virtual plane and the second lens surface is constant,
Wherein a curvature of a line segment formed by the second virtual plane with the second lens surface is not constant.

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