KR20190032814A - Receiving lens module and Receiving lens - Google Patents

Abstract

The present embodiment relates to a receiving lens module and a receiving lens. The receiving lens module according to one aspect includes a first lens including a first lens surface receiving light from the outside and a second lens surface changing the optical path of the light received from the first lens surface for sending the light to the outside; a second lens disposed below the first lens and including a third lens surface receiving the light by facing the second lens surface and a fourth lens surface changing the optical path of the light received from the third lens surface for sending the light to the outside; and a sensor disposed below the second lens and detecting the light that has passed through the fourth lens surface. At least one of the line segments formed by the second lens surface and cross sections including the optic axis of the first lens has a predetermined curvature of radius. At least one of the other line segments formed by the second lens surface and the cross sections including the optic axis of the first lens has a changing curvature of radius.

Description

[0001] The present invention relates to a receiving lens module and a receiving lens,

The present embodiment relates to a light receiving lens module and a light receiving lens.

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 The present invention has been proposed in order to solve the above problems, and it is an object of the present invention to provide a light receiving lens module and a light receiving lens which can increase light receiving efficiency at a wide angle.

The light receiving lens module according to the present embodiment includes a first lens including a first lens surface for receiving light from the outside and a second lens surface for changing an optical path of the light received from the first lens surface to the outside, A third lens surface disposed on the lower side of the first lens and adapted to receive light facing the second lens surface, and a fourth lens surface for changing the optical path of the light received from the third lens surface, A second lens including a second lens; And a sensor disposed on the lower side of the second lens and sensing light passing through the fourth lens surface, wherein the cross-sections including the optical axis of the first lens and the cross- At least one of the line segments having the predetermined curvature and at least one of the line segments including the optical axis of the first lens and the second lens surface is formed is a line segment whose curvature changes .

The light receiving lens according to the present embodiment includes a first lens including a first lens surface for receiving light from the outside and a second lens surface for changing an optical path of the light received from the first lens surface to outward; And a fourth lens disposed on the lower side of the first lens and facing the second lens surface to receive light and a fourth lens that changes an optical path of the light received from the third lens surface and emits the light to the outside, Wherein the optical axis extending in the height direction of the first lens is a Z-axis, the Z-axis is perpendicular to the Z-axis, the Z-axis is a point on the Z-axis, An X-axis extending in the longitudinal direction, an X-axis extending perpendicular to the X-axis and the Z-axis and extending in the width direction of the first lens through an intersection between the X-axis and the Z-axis, A curvature of a line segment in which the first virtual plane is formed with the first lens surface 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, And the second virtual plane meets and forms the first lens surface Wherein a curvature of a line segment in which the first virtual plane is formed with the second lens surface is constant and a curvature of a line segment in which the second virtual plane is formed with the second lens surface is constant I do not.

The efficiency of light incident at a wide angle can be increased to a certain level or more.

Also, the light passing through the lens through the defocusing lens has a certain area on the sensor surface, so that the light efficiency can be maintained above a certain level even if the incident angle is increased.

Further, even when the angle of incidence of light is changed, it is possible to provide a defocusing lens that does not have a large rate of change in the amount of light passing therethrough, so that it is suitable for a sensor that responds to a light quantity exceeding a certain level.

In addition, since the light uniformly incident through the first lens unit is refracted through the second lens unit, there is an advantage that the incidence efficiency is increased.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing an example of receiving light incident at a wide angle in a ladder for a vehicle. Fig.
2 is a first cross-sectional view of a light receiving lens module according to an embodiment of the present invention.
3 is a second sectional view of a light receiving lens module according to an embodiment of the present invention.
4 is a view showing an example in which the distance from the center of the sensor surface increases as the incident angle of light incident on the first lens according to the embodiment of the present invention increases.
5 is a view showing an example in which the light incident on the first lens according to the embodiment of the present invention is defocused and the area on the sensor surface is away from the center of the sensor surface according to the incident angle.
6 is a sectional view showing a side surface of a light receiving lens module according to an embodiment of the present invention.
7 is a sectional view showing a lower surface of the light receiving lens module according to the embodiment of the present invention.
8 is a perspective view of a first lens according to an embodiment of the present invention.
9 is a perspective view of a second lens according to an embodiment of the present invention.
10 is a cross-sectional view of a second lens according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described with reference to exemplary drawings. In describing the components in the drawings, the same components are denoted by the same reference numerals whenever possible, even if they are displayed on other drawings.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected, coupled, or connected to the other component, It should be understood that another element may be "connected", "coupled" or "connected" between elements.

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.

2 is a first cross-sectional view of a light receiving lens module according to an embodiment of the present invention.

2, the light receiving lens module 200 according to the embodiment of the present invention may include light receiving lenses 210 and 230 and a sensor 250. The light receiving lenses 210 and 230 may include a first lens 210 and a second lens 230 disposed below the first lens 210.

The first lens 210 may include a first lens surface 211 and a second lens surface 212. As shown in the drawing, the first lens surface 211 is convex in the direction of the light source (or the object) in the first end surface (in one embodiment, the end surface formed by the cut surface parallel to the surface formed by the X axis and the Z axis) And the second lens surface 212 may have a concave shape toward the sensor 250 or a convex shape toward the light source (or subject).

Here, the first lens surface 211 in the first cross section may have a hemispherical shape. At least one of the sections including the optic axis of the light receiving lens module 200 and the line segments formed by the first lens surface are formed, 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 words, it may mean an axis that is not optically different even if the light receiving lens module 200 is rotated.

On the other hand, the first lens surface 211 of the first end surface 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 hemispherical shape .

The light receiving lenses 210 and 230 according to the present invention may have a positive refractive index. More specific shapes of the first lens 210 will be described later.

The second lens 230 is disposed below the first lens 210. More specifically, the second lens 230 may be disposed to face the second lens surface 212. At this time, the second lens surface 212 of the first lens 210 and the third lens surface 231 of the second lens 230 may be spaced apart from each other. Accordingly, a space 215 may be formed between the second lens surface 212 and the third lens surface 231.

The second lens mount 217 may be provided on the lower side of the first lens 210 by the concave shape of the second lens surface 212 of the first lens 210, 217, the second lens 230 is accommodated. At this time, a connecting surface 218 connecting the first lens surface 211 and the second lens surface 212 of the outer surface of the first lens 210 and the fourth lens surface 232 are the same A plane can be formed. Alternatively, the connecting surface 218 may be flush with the lower surface of the sensor 250.

The second lens 230 may include a third lens surface 231 and a fourth lens surface 232. The third lens surface 231 may have a convex shape in the direction of a light source (or a subject), and the fourth lens surface 232 may be formed in a plane.

The third lens surface 231 in the first cross section may have a hemispherical shape. The hemispherical shape of the third lens surface 231 will be described in more detail. Among the line segments formed by the intersection of the optical axis of the light receiving lens module 200 and the first lens surface, At least one line segment may have a constant curvature. More specific shapes of the second lens 230 will be described later.

On the other hand, the sensor 250 is disposed below the light receiving lenses 210 and 230. Specifically, the sensor 250 may be disposed below the fourth lens surface 232. More specifically, it may be disposed at the center of the hemispherical or semicircular shape which is the shape of the first lens surface 201 or the second lens surface 202 in the first end face. In other words, it may be disposed at the center of the hemispherical or semicircular shape which is the shape of the third lens surface 231 or the fourth lens surface 232 in the first cross section. When the hemispherical or semicircular center extends a given hemisphere or semicircle to form a complete sphere or circle, the position of the sensor 250 may be the center of the sphere or circle. Also, the sensor 250 may be coupled to the fourth lens surface 232 of the second lens 230. A cover (not shown) for covering the upper surface of the sensor 240 may be provided on the upper surface of the sensor 250.

A bonding portion 290 may be provided between the sensor 250 and the fourth lens surface 232. The adhesive portion 290 may be a region coated with an adhesive material. Therefore, the second lens 230 and the sensor 240 can be coupled by the adhesive portion 290. [ The region where the bonding portion 290 is formed may have a refractive index that refracts light. The refractive index of the adhesive portion 290 may be equal to or greater than the refractive index of the second lens 230 and may be less than or equal to the refractive index of the cover portion.

The length of the light-receiving lens module 200 according to the present invention in the X-axis direction may be 43.8 mm, and the radius of the hemispherical shape, which is the distance from the center of the hemispherical shape to the first lens surface 211, is 43.8 mm Which is half of that of the first embodiment. Further, the sensor 250 may be disposed at a distance of about 2 to 5 mm from the center of the hemispherical shape to the lower side (the? -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 and the length in the X axis direction of the light receiving lens module 200 is in the range of 1: 21.9 . ≪ / RTI > Specifically, the cut length ratio is preferably included in the range of 1:20 to 1:35.

If the thickness of the light receiving lens module 200 according to the present invention, the radius length or diameter of the first lens surface 211, or the total surface area of the lens is increased, the total amount of light received by the lens will increase, The diameter D of the sensor for sensing the incident light is preferably increased.

Meanwhile, a plurality of protrusions 270 may be disposed on the connection surface 218. The plurality of protrusions 27 are configured to physically connect the light receiving lens module 200 to the light receiving unit 110 and are disposed at a position spaced apart from the end of the first lens surface 212 by about 5.8 mm .

3 is a second sectional view of a light receiving lens module according to an embodiment of the present invention.

Referring to FIG. 3, the first lens surface 211 may have a spherical shape in a second end surface (in a 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 212 may have an aspherical shape. The third lens surface 231 may have a spherical or aspherical shape.

The aspherical surface shape of the second lens surface 212 may be more specifically described as follows. That is, at least one of the sections including the optical axis of the light receiving lens module 200 and the line segments formed by the second lens surface 212 Line segments can have a constant curvature. At the same time, at least one of the line segments including the optical axis of the light receiving lens module 200 and the line segments formed by the second lens surface 212 may have a non-uniform curvature.

On the other hand, the second lens surface 212 in the second cross-section can increase the efficiency of light incident at an angle of +4 to -4 degrees in the Y-axis direction due to the aspherical shape.

Here, the second lens surface 212 defocuses the light passing through the first lens surface 211 through the aspherical shape, and outputs the light in a direction in which the sensor 250 is positioned.

More specifically, in the light-receiving lens module 200, the light sequentially passing through the first lens surface 211 and the second lens surface 212 passes through the second lens surface 202, which is described above, Of the second lens 240 and the sensor 240 through the defocusing generated in the aspherical shape of the second lens 240 and the sensor 240.

In a specific embodiment, in the spherical shape of the first lens surface 211 in the second cross section of the light receiving lens 200 according to the present invention, the thickness of the first lens surface 211 may be 26.5 mm have.

On the other hand, the constant area reaching the sensing area of the sensor 250 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 211 and the Y-axis incident angle with respect to the first lens surface . This can be changed again through the second lens 230, which will be described later.

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.

4 is a view showing an example in which the distance from the center of the sensor surface increases as the incident angle of light incident on the first 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 211 among the incident angles of the light incident on the first lens 210 according to the present invention sequentially increases by 0, 1.7, and 3.4 degrees. .

An example (A) in which light passing through the second lens surface 212 reaches a position that is sequentially distant from the center of the sensor 250 through defocusing generated in the aspherical shape of the second lens surface 212, .

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

5, in the first lens 210, when the incident angle of the Y-axis with respect to the first lens surface 211 is increased by 3.4 degrees in comparison with zero degree, the di- It can be confirmed that light passing through the second lens surface 212 reaches a position away from the center B of the sensor surface 250 through focusing.

As a result, a constant area where the light that has passed through the second lens surface 212 reaches the sensing area of the sensor 250 is the incident angle of the X axis with respect to the first lens surface 211 and the incident angle with respect to the first lens surface 211 Axis and the incidence angle of the Y-axis.

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.

At this time, when the incident angle is 0 degree, the diameter of a certain area of the light passing through the second lens surface 212 located on the sensor surface can be about 2.2 mm, and when the incident angle is 3.4 degrees, The diameter of the constant area of light passing through the two lens surfaces 212 may be about 2.1 mm.

That is, if the diameter of the sensor surface of the sensor 250 is about 2 mm, the light that has passed through the second lens surface 212 when the incident angle is 0 degrees reaches the sensor surface with an area ratio of about 90%, and the incident angle is 3.4 degrees Light passing through the second lens surface reaches the sensor surface at an area ratio of about 60%.

Various examples of the incident angle of the X-axis with respect to the first lens surface 211 and the incident angle with respect to the Y-axis of the first lens surface 212 are shown in Table 1 below.

 [Table 1]

Meanwhile, in the above specific example, various examples of the case of using the light receiving lens module and the case of not having the lens are shown in Table 2 below.

[Table 2]

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.

FIG. 6 is a cross-sectional view showing a side surface of a light receiving lens module according to an embodiment of the present invention, FIG. 7 is a sectional view showing a bottom surface of a light receiving lens module according to an embodiment of the present invention, 1 is a perspective view of the first lens.

Referring to FIG. 6, the plurality of protrusions 270 may be disposed at a position separated from the end of the first lens surface 211 by about 5.2 mm on the second end face. The plurality of protrusions 270 may have a thickness of about 4-3 mm and the plurality of protrusions 270 may have a connecting surface 218 connecting the first lens surface 211 and the second lens surface 212, The length protruding from the protrusion can be about 3.5 mm.

On the other hand, the distance between the first lens surface 211 and the second lens surface 212 on the optical axis may be about 14 mm, and the distance from the center of the hemispherical shape to the first lens surface 211, The radius length may be about 21.9 mm as described above.

Next, referring to FIG. 7, the connecting surface 218 can be confirmed more specifically.

7, the light receiving lens module 200 according to the present invention includes two connecting surfaces 218 connecting the first lens surface 211 and the second lens surface 212, two on the left and right sides, respectively, And the light receiving lens module 200 may be physically connected to the light receiving unit 130 through the corresponding four protrusions 270. [

2, the length of the light receiving lens module 200 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. In the light receiving lens module 200, The thickness of one lens surface 211 may be about 26.5 mm as described above with reference to FIG.

Finally, referring to FIG. 8, the three-dimensional shape of the first lens according to the present invention, which is two-dimensionally illustrated through FIGS. 6 and 7, can be confirmed.

Specifically, an actual implementation of the light-receiving lens module 200 described with reference to FIGS. 6 to 8 preferably satisfies the numerical values shown in Tables 4 and 5 and Equation 1 below. Here, S1 and S2 denote a spherical first lens surface 211 and an aspherical second lens surface 212, respectively.

[Table 4]

Here, the coating of the second lens surface 212 enables the light receiving lens module 200 to perform a band pass filter function for detecting only a predetermined wavelength.

[Table 5]

[Equation 1]

Equation (1) represents an aspheric surface expression. Where R may be -19.1922037933, K may be 0, B4 may be 0.0001549820, B6 may be 3.6450096648e-8, and B10, B12 and B14 may be zero.

More specifically, the shape of the second lens surface 212 of an aspherical shape will be described. The second lens surface 212 has a first surface 212a that protrudes relative to the other surface, And a second surface 212b and a third surface 212c disposed on both sides of the surface 212a and relatively recessed relative to the first surface 212a.

That is, the first surface 212a, which forms the center in the circumferential direction of the second lens surface 212, is formed on the second surface 212b and the third surface 212c, which are the edge surfaces of the second lens surface 212, The second lens 230 may be protruded relative to the second lens 230. As a result, it is possible to more efficiently receive the optical signal incident at the wide angle, thereby increasing the efficiency.

The first lens 210 will be described in more detail with reference to FIGS. 6 to 8 as follows.

First, the optical axis extending in the height direction of the first lens 210 is referred to as a Z axis (for example, the Z axis in FIG. 2), passing through a point on the Z axis perpendicular to the Z axis, 1, the axis extending in the longitudinal direction of the first lens 210 is referred to as an X axis (for example, the X axis in FIG. 2) (For example, the Y axis in FIG. 2), and a virtual plane including the X axis and the Z axis is referred to as a first virtual plane (for example, the first virtual plane in FIG. 2 Section), and a virtual plane including the Y axis and the Z axis is defined as a second virtual plane (e.g., the second section in FIG. 3).

6 to 8, the curvature of the line segment formed by the first virtual plane and the first lens surface 211 of the first lens 210 may be constant, and the curvature of the line segment formed by the second virtual plane The curvature of a line segment formed with the first lens surface 211 of the first lens 210 may be constant.

The curvature of the line segment formed by the first virtual plane with the second lens surface 212 of the first lens 210 may be constant and the second virtual plane may be formed on the second lens surface 212 of the first lens 210, The curvature of the line segment formed with the second line 212 may not be constant.

On the other hand, the curvature of a line segment formed by the second virtual plane with the third lens surface 231 may be constant. Alternatively, the curvature of the line segment formed by the second virtual plane with the third lens surface 231 may not be constant.

FIG. 9 is a perspective view of a second lens according to an embodiment of the present invention, and FIG. 10 is a sectional view of a second lens according to an embodiment of the present invention.

9 and 10, the second lens 230 disposed on the lower side of the first lens 210 may have a length in the X-axis direction of 14.48 mm. In the center of the hemispherical shape, The radius of the hemispherical shape, which is the distance to the surface 231, may be 7.24 mm. In addition, the length of the second lens 230 in the Y-axis direction may be 5 mm.

As described above, the second lens 230 has the convex shape of the third lens surface 231, and the plane surface of the third lens surface 231, which is disposed below the third lens surface 231 and is coupled to the sensor 250, 4 lens surface 232. The lens surface 232 may be a mirror surface. In this case, the third lens surface 231 may have a spherical or aspherical shape.

In this case, when the second lens 230 is disposed below the first lens 210 including the aspherical second lens surface 212, the following effects can be obtained.

[Table 6]

In the case where only the sensor 250 is disposed and the first lens 210 is disposed on the sensor 250 as shown in Table 6, the first lens 210 and the second lens 230 The light amount ratios can be compared by dividing the case where they are all disposed in the sensor 250. [

When the light amount when only the sensor 250 is disposed is set as the reference 1 and when the first lens 210 is placed on the sensor 250, the light amount ratio is 7.16. When the first lens 210 and the second lens 230 are both disposed on the sensor 250, the light amount ratio is 16.57.

As described above, when the second lens 230 is disposed between the first lens 210 and the sensor 250, it can be seen that the amount of light incident on the sensor 250 increases. It can be understood that light passing through the first lens 210 passes through the second lens 230, and the amount of light increases by two times or more. That is, the light incident uniformly through the first lens 210 may increase the incident efficiency through the second lens 230.

The light receiving lens module according to the present invention can increase the efficiency of light incident from all angles of the wide angle using a lens only to a certain level or more without a mechanical structure such as a motor, The light passing through the light guide plate has a constant area on the sensor surface, and the light efficiency can be maintained at a certain level or more even if the incident angle is increased.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them. It is to be understood that the terms such as 'include', 'comprising', or 'having', as used herein, mean that a component can be implied unless specifically stated to the contrary. But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (12)

A first lens including a first lens surface for receiving light from the outside and a second lens surface for changing an optical path of the light received from the first lens surface to outward;
A third lens surface disposed on the lower side of the first lens and adapted to receive light facing the second lens surface, and a fourth lens surface for changing the optical path of the light received from the third lens surface, A second lens including a second lens; And
And a sensor disposed below the second lens for sensing light passing through the fourth lens surface,
Wherein at least one of the line segments including the optical axis of the first lens and the line segments formed by the second lens surface meet have a constant curvature,
Wherein the curvature of the at least one line segment of the line segments formed by the intersection of the optical axis of the first lens and the second lens surface is changed.
The method according to claim 1,
Wherein at least one of the line segments including the optical axis of the first lens and the line segments formed by the first lens surface meet has a constant curvature.
The method according to claim 1,
Wherein light reaching the first lens is defocused and reaches a sensing area of the sensor in a form having a predetermined area.
The method according to claim 1,
Wherein the second lens surface is a concave-
And a second surface and a third surface that are respectively disposed on both sides of the first surface and are relatively recessed relative to the first surface.
The method according to claim 1,
And the third lens surface is a spherical surface.
The method according to claim 1,
And the third lens surface is a non-spherical surface.
The method according to claim 1,
Wherein the first lens forms a lower surface and includes a connecting surface connecting the first lens surface and the second lens surface,
Wherein the connecting surface forms the same plane as the fourth surface.
The method according to claim 1,
And a space portion that separates the second lens surface and the third lens surface from each other.
The method according to claim 1,
The sensor is disposed on the optical axis,
Wherein the first lens has a positive refractive index.
A first lens including a first lens surface for receiving light from the outside and a second lens surface for changing an optical path of the light received from the first lens surface to outward; And
A third lens surface disposed on the lower side of the first lens and adapted to receive light facing the second lens surface, and a fourth lens surface for changing the optical path of the light received from the third lens surface, And a second lens including a second lens,
An optical axis extending in the height direction of the first lens is defined as a Z-axis, an intersection is formed perpendicularly to the Z-axis and passing through a point on the Z-axis and an axis extending in the longitudinal direction of the first lens is defined as an X- A Y-axis extending perpendicularly to the Z-axis and extending in the width direction of the first lens through an intersection between the X-axis and the Z-axis, a virtual plane including the X-axis and the Z- When a virtual plane including an axis and a Z axis 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.
11. The method of claim 10,
Wherein a curvature of a line segment formed by the second virtual plane and the third lens surface is constant.
11. The method of claim 10,
Wherein a curvature of a line segment formed by the second virtual plane and the third lens surface is not constant.

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