KR102502283B1 - Receiving lens module and Receiving lens - Google Patents

Abstract

This embodiment relates to a light receiving lens module and a light receiving lens. A light receiving lens module according to one aspect 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 light received from the first lens surface and emitting it to the outside; A third lens surface disposed under the first lens and facing the second lens surface to receive light, and a fourth lens surface to change the optical path of the light received from the third lens surface and send it out. A second lens including; and a sensor disposed under the second lens to detect light passing through the fourth lens surface, wherein cross sections including an optic axis of the first lens and the second lens surface are formed. At least one of the lines formed by meeting has a constant curvature, and the curvature of one or more of the lines formed by the intersection of end faces including the optical axis of the first lens and the surface of the second lens changes.

Description

Receiving lens module and receiving lens {Receiving lens module and Receiving lens}

This embodiment relates to a light receiving lens module and a light receiving lens.

Recently, in the field of intelligent automobiles and smart cars, a vehicle's active coping function for unexpected situations is required. That is, by recognizing the sudden appearance of pedestrians, detecting obstacles in areas out of the range of lighting in dark nights in advance, detecting obstacles due to weak headlights in rainy weather, or detecting road damage in advance, the driver It is necessary to identify situations that threaten the safety of pedestrians and pedestrians in advance.

In response to this demand, it is installed on the windshield or the front of the vehicle, and when the vehicle moves based on its own emitted light, it checks the object in front and warns the driver in advance, as well as the vehicle itself is the basis for stopping or avoiding. The image is transmitted to an electronic control unit (ECU) of the vehicle, and the ECU performs various controls using the image. An acquisition of such an image is called a scanner.

As a conventional scanner, radio detection and ranging (RADAR) equipment has been used. Radar is a wireless monitoring device that detects the distance, direction, altitude, etc. to an object by emitting electromagnetic waves of the degree of microwave (ultra-high frequency, 10 cm to 100 cm wavelength) to an object and receiving the electromagnetic wave reflected from the object. It is used in vehicle scanners. However, since the price is high, there is a problem in that it is not easy to spread to various types of vehicles.

In order to solve this problem, a scanner using a light detection and ranging (LiDAR) has been developed. LIDAR is a device that emits pulsed laser light into the air and measures distance or atmospheric phenomena using the reflector or scatterer, and is also called laser radar.

In the case of LIDAR, the provided sensor must stably accept signals incident from various directions, that is, from a wide wide angle. Specifically, the vehicle lidar measures the efficiency of incident light at a wide angle ranging from about +70 degrees to -70 degrees on the X axis and about +3.4 degrees to -3.4 degrees on the Y axis at all angles included in the range. There is a need to increase in

Conventionally, in order to receive signals of all light incident at a wide angle as described above at a certain level or higher, a coaxial method of moving a light emitting unit and a light receiving unit together through a motor has been used.

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

The present invention has been proposed to improve the above problems, and provides a high-efficiency light-receiving lens module and light-receiving lens capable of increasing light-receiving efficiency at a wide angle.

A light receiving lens module according to this 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 light received from the first lens surface and emitting it to the outside; A third lens surface disposed under the first lens and facing the second lens surface to receive light, and a fourth lens surface to change the optical path of the light received from the third lens surface and send it out. A second lens including; and a sensor disposed under the second lens to detect light passing through the fourth lens surface, wherein cross sections including an optic axis of the first lens and the second lens surface are formed. At least one line segment of the lines formed by meeting has a constant curvature, and one or more of the lines formed by meeting the cross sections including the optical axis of the first lens and the surface of the second lens are lines of varying curvature. .

A light-receiving lens according to this 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 light received from the first lens surface and emitting it to the outside; and a third lens surface disposed under the first lens and facing the second lens surface to receive light, and a fourth lens to change the optical path of the light received from the third lens surface and send it out. It includes a second lens including a surface, and an optical axis extending in a height direction of the first lens is a Z-axis, perpendicular to the Z-axis and passing through a point on the Z-axis to form an intersection, and An axis extending in the longitudinal direction is an X axis, an axis perpendicular to the X axis and the Z axis, passing through the intersection of the X axis and the Z axis, and extending in the width direction of the first lens is a Y axis, and includes the X axis and the Z axis When a virtual plane is defined as a first virtual plane and a virtual plane including the Y-axis and Z-axis is defined as a second virtual plane, 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 The curvature of the line segment formed by the plane meeting the second lens surface is not constant.

Through this embodiment, the efficiency of light incident at a wide angle can be increased to a certain level or more.

In addition, since the light passing through the lens through the defocusing type lens has a constant area on the sensor surface, light efficiency can be maintained at a certain level or higher even if the incident angle is increased.

In addition, it may be suitable for a sensor that responds to a certain level or more of a light amount by providing a defocusing lens in which the rate of change in the amount of light passing through is not large even when the incident angle of light changes.

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

1 is a view showing an example of receiving light incident at a wide angle in a lidar for a vehicle.
2 is a view showing a first cross section of a light receiving lens module according to an embodiment of the present invention.
3 is a view showing a second cross section of a light receiving lens module according to an embodiment of the present invention.
FIG. 4 is a view showing an example in which light incident on a first lens is further away from the center of a sensor surface as the incident angle increases according to an embodiment of the present invention.
5 is a diagram illustrating an example in which light incident on a first lens according to an embodiment of the present invention is defocused so that an area located on a sensor surface moves away from the center of the sensor surface according to an incident angle;
6 is a cross-sectional view showing a side of a light receiving lens module according to an embodiment of the present invention.
7 is a cross-sectional view showing a lower surface of a light receiving lens module according to an 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 through exemplary drawings. In describing the reference numerals for the components of each drawing, the same numerals indicate the same components as much as possible, even if they are displayed on different drawings.

Also, terms such as first, second, A, B, (a), and (b) may be used to describe components of an embodiment of the present invention. These terms are only used to distinguish the component from other components, and the nature, order, or order of the corresponding component is not limited by the term. When an element is described as being 'connected', 'coupled' or 'connected' to another element, the element may be directly connected, coupled or connected to the other element, but not between the element and the other element. It should be understood that another component may be 'connected', 'coupled' or 'connected' between elements.

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

As described above, in the field of intelligent cars and smart cars, in order for the vehicle to actively cope with an unexpected situation, a distance recognition sensor or a motion recognition sensor must accept signals coming from various directions, that is, from a wide angle.

As shown in FIG. 1, the light receiving unit 110 provided in a lidar mounted on a vehicle has a range 120 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. Light incident at a wide wide angle corresponding to (130) must be received relatively uniformly at all angles included in the corresponding range.

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

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

Referring to FIG. 2 , a light receiving lens module 200 according to an 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 a first cross section (in one embodiment, a cross section formed by a cut plane parallel to a plane formed by the X and Z axes), the first lens surface 211 is convex in the direction of the light source (or subject). 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. In more detail, the hemispherical shape, which is the shape of the first lens surface 211, is described in more detail. At least one of the cross sections including the optical axis of the light receiving lens module 200 and the lines formed by meeting the first lens surface. The above line segments may 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 does not optically differ even when the light receiving lens module 200 is rotated.

On the other hand, the first lens surface 211 in the first cross section substantially uniformly receives the amount of incident light at all angles included in the range of up to +70 degrees to -70 degrees in the X-axis direction due to its hemispherical shape. can be picked up

Also, the light receiving lenses 210 and 230 according to the present invention may have a positive (+) refractive index. A more specific shape 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. Thus, a space portion 215 may be formed between the second lens surface 212 and the third lens surface 231 .

Due to the concave shape of the second lens surface 212 of the first lens 210, a second lens mounting unit 217 may be provided below the first lens 210, and the second lens mounting unit ( 217) receives the second lens 230. At this time, the connection surface 218 connecting the first lens surface 211 and the second lens surface 212 among the outer surfaces of the first lens 210 and the fourth lens surface 232 are the same. plane can be formed. Alternatively, the connection surface 218 may form the same plane as 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 the light source (or subject), and the fourth lens surface 232 may be formed as a plane.

The third lens surface 231 in the first end surface may have a hemispherical shape. In more detail, the hemispherical shape, which is the shape of the third lens surface 231, is described in more detail. At least one line segment may have a constant curvature. A more specific shape of the second lens 230 will be described later.

Meanwhile, 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, the first lens surface 201 or the second lens surface 202 may be disposed at the center of a hemispherical or semicircular shape in the first end surface. In other words, it may be disposed at the center of a hemispherical or semicircular shape that is the shape of the third lens surface 231 or the fourth lens surface 232 in the first end surface. When the center of a hemisphere or semicircle is formed by extending a given hemisphere or semicircle to form a complete sphere or circle, the position of the sensor 250 may be at 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 part (not shown) may be provided on the upper surface of the sensor 250 to cover the upper surface of the sensor 240 .

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

In addition, 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 length of the radius of the hemisphere, which is the distance from the center of the hemisphere to the first lens surface 211, is 43.8 mm. It can be 21.9mm, which is half of . In addition, 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 (Z-axis direction in FIG. 2).

On the other hand, the ratio of the cut length of the high-efficiency light receiving lens 200 through the first end surface, specifically, the ratio between the length of the hemispherical radius and the length of the light receiving lens module 200 in the X-axis direction, satisfies 1:21.9. can be varied in various ways. Specifically, the cut length ratio is preferably included in the range of 1:20 to 1:35.

In addition, 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 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 preferable that the diameter (D) of the sensor for detecting the light incident along it is also increased.

Meanwhile, a plurality of protrusions 270 may be disposed on the connection surface 218 . Here, the plurality of protrusions 27 are configured to physically connect the light receiving lens module 200 to the light receiving unit 110, and are located at a distance of about 5.8 mm from the end of the first lens surface 212 on the first cross section. can be placed.

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

Referring to FIG. 3 , in a second cross section (in one embodiment, a cross section formed by a cut plane parallel to the plane formed by the Y and Z axes), the first lens surface 211 may have a spherical shape, and the second The lens surface 212 may have an aspheric shape. In addition, the third lens surface 231 may have either a spherical surface or an aspheric surface.

In more detail, the aspherical shape, which is the shape of the second lens surface 212, is described in more detail. A line segment may have a constant curvature. In addition, at least one of the line segments formed by meeting the end surfaces including the optical axis of the light receiving lens module 200 and the second lens surface 212 may have an irregular curvature.

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

Here, the second lens surface 212 may defocus the light that has passed through the first lens surface 211 and output it in the direction where the sensor 250 is located through the corresponding aspheric shape.

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 described above, as shown in FIG. Through the defocusing generated in the aspherical shape of , it reaches the sensing area of the second lens 240 and the sensor 240 in a form having a constant area.

And, as a specific embodiment, in the spherical shape, which is the shape of the first lens surface 211 in the second end surface of the light receiving lens 200 according to the present invention, the thickness of the first lens surface 211 may be 26.5 mm. there is.

On the other hand, a constant area reaching the sensing area of the sensor 250 by defocusing may vary 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. can This can be changed again through the second lens 230 to be described later.

Here, the incident angle of the X axis is preferably included in the range of +70 degrees to -70 degrees, and the incident angle of the Y axis is preferably included in the range of +4 degrees to -4 degrees.

FIG. 4 is a diagram illustrating an example in which light incident on a first lens according to an embodiment of the present invention moves away from the center of a sensor surface as the incident angle increases.

Referring to FIG. 4 , it can be confirmed that among the angles of incidence of light incident on the first lens 210 according to the present invention, the Y-axis angle of incidence with respect to the first lens surface 211 sequentially increases to 0 degrees, 1.7 degrees, and 3.4 degrees. can

Example (A) in which light passing through the second lens surface 212 arrives at a position sequentially away from the center of the sensor 250 through defocusing generated in the aspheric shape of the second lens surface 212 described above can be checked.

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

Referring to FIG. 5 , in the first lens 210, when the angle of incidence of the Y axis with respect to the first lens surface 211 is increased by 3.4 degrees compared to 0 degrees, the aspheric shape of the second lens surface 212 is generated. Through focusing, it can be confirmed that the light passing through the second lens surface 212 reaches a position away from the center B of the sensor surface 250 .

As a result, the constant area where the light passing through the second lens surface 212 reaches the sensing area of the sensor 250 is the angle of incidence of the X axis with respect to the first lens surface 211 and the area relative to the first lens surface 211. It can be seen that the Y-axis is changed according to at least one incident angle among incident angles.

For example, the lens is formed of polymethylmethacrylate (PMMA), and the light source ranges from +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. While moving within the range of degrees, light corresponding to a power of 1W can be output, and when the diameter of the sensing surface 410 of the sensor is 2mm, the amount of light incident on the sensor can be 3nW or more.

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

That is, if the diameter of the sensor surface of the sensor 250 is about 2 mm, when the incident angle is 0 degrees, the light passing through the second lens surface 212 reaches the sensor surface at an area ratio of about 90%, and when 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 incident angles of the X-axis with respect to the first lens surface 211 and Y-axis with respect to the first lens surface 212 related to this are shown in Table 1 below.

[Table 1]

On the other hand, in the above specific example, various embodiments for the case of using a light receiving lens module and the case of not having a lens are shown in Table 2 below.

[Table 2]

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

6 is a cross-sectional view showing a side of a light receiving lens module according to an embodiment of the present invention, FIG. 7 is a cross-sectional view showing a lower surface of a light receiving lens module according to an embodiment of the present invention, and FIG. 8 is a cross-sectional view according to an embodiment of the present invention. It is a perspective view of the first lens.

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

Meanwhile, 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 is the corresponding hemispherical shape. The radius length may be about 21.9 mm as described above.

Next, referring to FIG. 7 , the connection surface 218 can be identified in more detail.

As shown in FIG. 7, the light receiving lens module 200 according to the present invention has two pieces on the left and right sides of the connection surface 218 connecting the first lens surface 211 and the second lens surface 212, respectively. , may include all four protrusions 270, and the light receiving lens module 200 may be physically connected to the light receiving unit 130 through the corresponding four protrusions 270.

Meanwhile, the length of the light receiving lens module 200 according to the present invention in the direction of the X axis (the X axis in FIG. 2) may be about 43.8 mm as described in FIG. 2, and the light receiving lens module 200 provided in the first The thickness of one lens surface 211 may be about 26.5 mm as described above with reference to FIG. 3 .

Finally, referring to FIG. 8 , the 3D shape of the first lens according to the present invention described in 2D through FIGS. 6 and 7 can be confirmed.

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

[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 preset wavelengths.

[Table 5]

[Equation 1]

Equation 1 represents an 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.

More specifically, describing the shape of the aspheric second lens surface 212, the second lens surface 212 includes a first surface 212a that protrudes relatively compared to other areas, and the first surface 212a. It may include a second surface 212b and a third surface 212c disposed on both sides of the surface 212a and formed to be relatively recessed compared to the first surface 212a.

That is, the first surface 212a forming the center in the circumferential direction of the second lens surface 212 is the edge surface of the second lens surface 212, the second surface 212b and the third surface 212c. ), it may relatively protrude toward the second lens 230. Due to this, it is possible to more efficiently receive light signals incident from a wide angle, so that efficiency can be increased.

If the first lens 210 is described in more detail with reference to FIGS. 6 to 8 , it can be described as follows.

First, the optical axis extending in the height direction of the first lens 210 is referred to as the Z-axis (eg, the Z-axis in FIG. 2), and is perpendicular to the Z-axis and penetrates a point on the Z-axis to form an intersection. An axis extending in the longitudinal direction of one lens 210 is referred to as the X axis (eg, the X axis of FIG. 2 ), and is perpendicular to the X and Z axes and passes through the intersection of the X and Z axes, and the first lens 210 An axis extending in the width direction of ) is referred to as the Y axis (eg, the Y axis in FIG. 2), and a virtual plane including the corresponding X and Z axes is referred to as a first virtual plane (eg, the first virtual plane in FIG. 2). cross-section), and a virtual plane including the corresponding Y-axis and Z-axis is defined as a second virtual plane (eg, the second cross-section in FIG. 3).

At this time, as shown in FIGS. 6 to 8 , the curvature of the line segment formed when the first virtual plane meets the first lens surface 211 of the first lens 210 may be constant, and the second virtual plane The curvature of a line segment formed by meeting the first lens surface 211 of the first lens 210 may be constant.

In addition, the curvature of a line segment formed when the first virtual plane meets the second lens surface 212 of the first lens 210 may be constant, and the second virtual plane is the second lens surface of the first lens 210. The curvature of the line segment formed by meeting (212) may not be constant.

Meanwhile, the curvature of a line segment formed when the second virtual plane meets the third lens surface 231 may be constant. Unlike this, the curvature of the line segment formed when the second virtual plane meets the third lens surface 231 may not be constant.

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

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

As described above, the second lens 230 has a convex third lens surface 231 and a plane disposed below the third lens surface 231 and coupled to the sensor 250. Four lens surfaces 232 may be included. At this time, the third lens surface 231 may have either a spherical surface or an aspherical surface.

At this time, when the second lens 230 is disposed below the first lens 210 including the aspherical second lens surface 212, the following effects are obtained.

[Table 6]

As shown in Table 6, when only the sensor 250 is disposed, when the first lens 210 is disposed on the sensor 250, the first lens 210 and the second lens 230 are The light quantity ratio can be compared by classifying the cases in which all are disposed in the sensor 250 .

When the amount of light when only the sensor 250 is disposed is taken as reference 1, when the first lens 210 is disposed on the sensor 250, the light amount ratio is 7.16. Also, when both the first lens 210 and the second lens 230 are disposed on the sensor 250, the light quantity 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. This can be understood as the fact that the amount of light passing through the first lens 210 is increased by more than twice as much as the light passes through the second lens 230 . That is, the incident efficiency of light uniformly incident through the first lens 210 may be increased through the second lens 230 .

The light-receiving lens module according to the present invention can increase the efficiency of incident light at all angles of a wide angle to a certain level or more by using only a lens without a mechanical configuration such as a motor, and can increase the efficiency of light incident through a defocusing type lens. Since the light passing through has a certain area on the sensor surface, there is an advantage in that light efficiency can be maintained at a certain level or higher even if the incident angle is increased.

In the above, even though all the components constituting the embodiment of the present invention have been described as being combined or operated as one, the present invention is not necessarily limited to these embodiments. That is, within the scope of the object of the present invention, all of the components may be selectively combined with one or more to operate. In addition, terms such as 'include', 'comprise' or 'having' described above mean that the corresponding component may be present unless otherwise stated, and thus exclude other components. It should be construed as being able to further include other components. All terms, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention belongs, unless defined otherwise. Commonly used terms, such as terms defined in a dictionary, should be interpreted as being consistent with the contextual meaning of the related art, and unless explicitly defined in the present invention, they are not interpreted in an ideal or excessively formal meaning.

The above description is merely an example of the technical idea of the present invention, and various modifications and variations can be made to those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

Claims (12)

a first lens including a first lens surface that is a spherical surface that receives light from the outside and a second lens surface that is an aspherical surface that changes an optical path of light received from the first lens surface and emits it to the outside;
A third lens surface disposed under the first lens and facing the second lens surface to receive light, and a fourth lens surface to change the optical path of the light received from the third lens surface and send it out. A second lens including; and
A sensor disposed under the second lens to detect light passing through the surface of the fourth lens;
At least one of the line segments formed by meeting the cross sections including the optical axis of the first lens and the surface of the second lens has a constant curvature;
The curvature of one or more other line segments among the lines formed by meeting the end faces including the optical axis of the first lens and the surface of the second lens changes;
The second lens surface,
A first surface protruding from the other area, and second and third surfaces respectively disposed on both sides of the first surface and are relatively depressed compared to the first surface,
The third lens surface has an outwardly convex shape,
The fourth lens surface is flat,
A cover portion covering an upper surface of the sensor,
An adhesive portion disposed between the sensor and the fourth lens surface,
The refractive index of the bonding portion is greater than or equal to the refractive index of the second lens and is less than or equal to the refractive index of the cover portion.
According to claim 1,
The light receiving lens module of claim 1 , wherein at least one line segment among end surfaces including the optical axis of the first lens and the line segments formed by meeting the surface of the first lens has a constant curvature.
According to claim 1,
The light receiving lens module wherein the light reaching the first lens is defocused and arrives at the sensing area of the sensor in a form having a constant area.
delete According to claim 1,
The third lens surface is a light receiving lens module having a spherical surface.
According to claim 1,
The third lens surface is a light receiving lens module having a non-spherical surface.
According to claim 1,
The first lens forms a lower surface and includes a connection surface connecting the first lens surface and the second lens surface,
The connection surface forms the same plane as the fourth lens surface.
According to claim 1,
The light receiving lens module further includes a space part spaced apart from the second lens surface and the third lens surface.
According to claim 1,
The sensor is disposed on the optical axis,
The light receiving lens module wherein the first lens has a positive (+) refractive index.
a first lens including a first lens surface that is a spherical surface that receives light from the outside and a second lens surface that is an aspherical surface that changes an optical path of light received from the first lens surface and emits it to the outside; and
A third lens surface disposed under the first lens and facing the second lens surface to receive light, and a fourth lens surface to change the optical path of the light received from the third lens surface and send it out. A second lens including; and
A sensor disposed under the second lens to detect light passing through the surface of the fourth lens;
The optical axis extending in the height direction of the first lens is the Z axis, the axis perpendicular to the Z axis passes through a point on the Z axis and forms an intersection, and the axis extending in the longitudinal direction of the first lens is the X axis, the X axis An axis perpendicular to the axis and the Z axis, passing through the intersection of the X axis and the Z axis, and extending in the width direction of the first lens is the Y axis, and a virtual plane including the X and Z axes is the first virtual plane, the Y When the virtual plane including the axis and the Z axis is defined as the second virtual plane,
The curvature of the line segment formed when the first virtual plane meets the first lens surface is constant,
The curvature of the line segment formed when the second virtual plane meets the first lens surface is constant,
The curvature of the line segment formed when the first virtual plane meets the second lens surface is constant,
The curvature of the line segment formed when the second virtual plane meets the second lens surface is not constant,
The second lens surface,
A first surface protruding from the other area, and second and third surfaces respectively disposed on both sides of the first surface and are relatively depressed compared to the first surface,
The third lens surface has an outwardly convex shape,
The fourth lens surface is flat,
A cover portion covering an upper surface of the sensor,
An adhesive portion disposed between the sensor and the fourth lens surface,
The refractive index of the bonding portion is greater than or equal to the refractive index of the second lens and is less than or equal to the refractive index of the cover portion.
According to claim 10,
The light-receiving lens having a constant curvature of a line segment formed by meeting the second virtual plane with the third lens surface.
According to claim 10,
The curvature of a line segment formed by meeting the second virtual plane with the third lens surface is not constant.

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