Optical lens and light source device adopting same

Abstract

The invention relates to the technical field of semiconductor light emitting, and discloses an optical lens and a light source device adopting the optical lens. The optical lens sequentially comprises a first lens and a second lens covering the first lens from bottom to top. The first lens is a long and narrow lens and comprises a first optical interface and a second optical interface. The second lens is a long and narrow lens and comprises a third optical interface and a fourth optical interface. A certain included angle is formed between the long and narrow direction of the first lens and the long and narrow direction of the second lens. The first optical interface and the third optical interface are free-form surfaces which are recessed towards the interiors of the first lens and the second lens respectively. Through surface type arrangement of the first lens and the second lens and crossed arrangement of the long and narrow ends, the optical shaping effect in different directions is guaranteed, meanwhile, the size range suitable for light-emitting chips is larger, and light emitting is more uniform. For the same light field area, the invention has the advantages of fewer light source devices, low production cost and small system volume, and is more beneficial to optical integration.

Description

Technical Field

[0001] The present invention belongs to the technical field of semiconductor light emitting, and in particular, relates to an optical lens and a light source device using the optical lens. Background Art

[0002] The light-emitting area of ​​the VCSEL chip is composed of multiple light cone holes, and the light is emitted from the light cone holes. The far-field light spot presents a Laguerre-Gaussian distribution, and the angle is generally between 10-30°. In order to meet the needs of large-angle FOV field of view in application scenarios, a secondary lens is usually added to the VCSEL light source for shaping, but the system volume is large. In order to reduce the volume of the system, the prior art also adopts direct structural design on the primary lens of the packaged VCSEL chip, but due to structural limitations, the size of the applicable VCSEL chip is small, the number of light sources used for the same light field area is large, and the light uniformity is poor.

[0003] Based on the above, the problem to be solved at present is: to provide an optical lens that is suitable for large-size chips and has uniform output, and a light source device using the optical lens. Summary of the invention

[0004] The object of the present invention is to provide an optical lens and a light source device using the optical lens, aiming to solve the problems in the prior art that the chip size of a single light source package is small and the light source emits uneven light.

[0005] The present invention is implemented as follows: an optical lens comprises, from bottom to top, a first lens and a second lens covering the first lens;

[0006] The first lens includes, from bottom to top, a first optical interface for inputting light and a second optical interface for outputting light; the first lens is a long and narrow lens formed by extending the first optical interface and the second optical interface along a certain direction;

[0007] The second lens includes, from bottom to top, a third optical interface for inputting light and a fourth optical interface for outputting light; the second lens is a long and narrow lens formed by extending the third optical interface and the fourth optical interface along a certain direction; the long and narrow direction of the first lens and the long and narrow direction of the second lens are arranged at a certain angle;

[0008] The first optical interface is a free-form surface that is concave toward the inside of the first lens, and the third optical interface is a free-form surface that is concave toward the inside of the second lens.

[0009] Further, the contour line of the projection of the first optical interface on the XZ plane is the first contour line, and the contour line of the projection of the third optical interface on the YZ plane is the second contour line;

[0010] The first contour line and the second contour line are curves that are concave towards the inside of the first lens and the second lens, respectively.

[0011] The X-axis, Y-axis, and Z-axis are the spatial rectangular coordinate axes. The plane formed by the X-axis and Y-axis is defined as the XY plane, the plane formed by the X-axis and Z-axis is defined as the XZ plane, and the plane formed by the Y-axis and Z-axis is defined as the YZ plane. The top view projection planes of the first lens and the second lens are parallel to the XY plane.

[0012] Furthermore, the first contour line and the second contour line are axisymmetric curves, respectively.

[0013] Furthermore, the contour line of the projection of the first optical interface on the YZ plane is the third contour line, and the third contour line is a straight line or a curve that is concave towards the inside of the first lens.

[0014] Furthermore, when the third contour line is a curve, the curvature of the third contour line is less than or equal to the curvature of the first contour line.

[0015] Furthermore, the contour line of the third optical interface on the XZ plane is the fourth contour line, and the fourth contour line is a straight line or a curve that is concave towards the inside of the second lens.

[0016] Furthermore, when the fourth contour line is a curve, the curvature of the fourth contour line is less than or equal to the curvature of the second contour line.

[0017] Furthermore, the linear lengths of the first optical interface in the X-axis direction and Y-axis direction are L1 and L2, respectively, satisfying L1 < L2; the linear lengths of the third optical interface in the X-axis direction and Y-axis direction are H1 and H2, respectively, satisfying H1 > H2.

[0018] A light source device includes the optical lens of the present invention and further includes a light-emitting chip. The light-emitting chip is disposed below the first optical interface, and a plurality of light-emitting holes are provided on the light-emitting chip. The light-emitting holes are distributed in a regular array or randomly.

[0019] Furthermore, the center line of the light-emitting surface of the light-emitting chip is parallel or overlapped with the center lines of the first lens and the second lens.

[0020] Compared with the prior art, the optical lens provided by the present invention and the light source device using the optical lens have the following beneficial effects:

[0021] 1. The present invention sets two first lenses and second lenses separated from each other, the first lens and the second lens are in a narrow and long shape, and the narrow and long ends of the two lenses are placed crosswise. The first lens and the second lens are respectively used to perform optical shaping on different directions of the incident light (for example, the X-axis and Y-axis directions). The narrow and long structures that cross each other break through the limitation of the single lens surface type on the size of the applicable light-emitting chip, and the area range of the light-emitting chip applicable to the present invention is relatively wide. Compared with the optical lens with a conical interface having the surface type of the first optical interface and the third optical interface at the same time, the present invention uses a new type of two separated lens combination, while ensuring the optical shaping effect in different directions, and the size range of the applicable light-emitting chip is larger. The concave free-form surfaces of the first optical interface and the third optical interface can refract light to a preset light-emitting angle, the light emission is more uniform, and the light field range can be very large. Compared with the prior art, for the same light field area, the present invention uses fewer light source devices, has a low production cost, and a small system volume, which is more conducive to optical integration.

[0022] 2. Through the refraction of the first contour line and the second contour line, optical shaping is achieved in the XZ plane and the YZ plane respectively, achieving a preset divergence angle and uniform light output. Because the narrow ends of the first lens and the second lens are arranged at an angle, the effective optical area of ​​the optical lens is increased, and large-sized light-emitting chips can be adapted while ensuring the quality of optical shaping. The first contour line and the second contour line are preferably axisymmetric curves, which are conducive to forming a symmetrical light field, such as a rectangular or quasi-rectangular light field.

[0023] 3. The sizes of the light emitting chip, the first lens and the second lens of the light source device of the present invention are increased successively, so that the entire optical lens completely covers the light emitting chip, thereby improving the light energy utilization rate and brightness uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the three-dimensional structure of the optical lens of Example 1 provided by the present invention;

[0025] Figure 2 is an XZ plane cross-sectional view of the optical lens of Example 1 provided by the present invention;

[0026] Figure 3 is a YZ plane cross-sectional view of the optical lens of Example 1 provided by the present invention;

[0027] Figure 4 is a schematic diagram of the three-dimensional structure of the optical lens of Example 2 provided by the present invention;

[0028] Figure 5 is a top view of the optical lens of Example 2 provided by the present invention;

[0029] Figure 6is a schematic diagram of the XZ plane cross-section structure of the optical lens of Example 2 provided by the present invention;

[0030] Figure 7 is a schematic diagram of the YZ plane cross-section structure of the optical lens of Example 2 provided by the present invention; Figure 8 It is a schematic diagram of the XZ plane cross-section structure of the light source device provided by the present invention;

[0031] Fig. 9 It is a schematic diagram of the YZ plane cross-section structure of the light source device provided by the present invention;

[0032] In the figure: 1-first lens; 11-first optical interface; 111-first contour line; 112-third contour line; 12-second optical interface; 2-second lens; 21-third optical interface; 211-second contour line; 212-fourth contour line; 22-fourth optical interface; 3-light-emitting chip; 31-light-emitting hole. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0034] The implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0035] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0036] Reference Figure 1-9 The figure shows a preferred embodiment of the present invention.

[0037] Reference Figure 1 The optical lens includes a first lens 1 and a second lens 2 from bottom to top, and the second lens 2 covers the first lens 1. The first lens 1 includes a first optical interface 11 for inputting light and a second optical interface 12 for outputting light from bottom to top. The first lens 1 is a long and narrow lens formed by the first optical interface 11 and the second optical interface 12 extending in a certain direction.

[0038] The second lens 2 includes a third optical interface 21 for inputting light and a fourth optical interface 22 for outputting light from bottom to top. The second lens 2 is a long and narrow lens formed by extending the third optical interface 21 and the fourth optical interface 22 in a certain direction. The long and narrow direction of the first lens 1 and the long and narrow direction of the second lens 2 are arranged at a certain angle. Preferably, the center line of the first lens 1 in its long and narrow direction and the center line of the second lens 2 in its long and narrow direction are arranged at a certain angle α, 0°<α<180°.

[0039] The second optical interface 12 and the third optical interface 21 are arranged close to each other, spaced apart, and correspondingly from bottom to top. Firstly, light enters the first lens 1 after being refracted by the first optical interface 11, and then exits from the first lens 1 after being refracted by the second optical interface 12. Then, the light enters the second lens 2 after being refracted by the third optical interface 21, and exits after being refracted by the fourth optical interface 22. The first optical interface 11 is a free-form surface that is concave in the direction of approaching the second optical interface 12, and the third optical interface 21 is a free-form surface that is concave in the direction of approaching the fourth optical interface 22.

[0040] The present invention sets two first lenses and second lenses separated from each other, the first lens and the second lens are in a long and narrow shape, and the long and narrow ends of the two lenses are placed crosswise. The first lens and the second lens are respectively used to perform optical shaping on different directions of the incident light (for example, the X-axis and the Y-axis directions). The long and narrow structures that cross each other break through the limitation of the single lens surface type on the size of the light-emitting chip, and the size of the applicable light-emitting chip is larger. Compared with a single optical lens with a surface type of the first optical interface 11 and the third optical interface 21 at the same time, the combination of the two separated lenses of the present invention ensures the optical shaping effect while broadening the size range of the applicable light-emitting chip in different long and narrow directions, and is particularly suitable for light-emitting chips with a plurality of light-emitting holes. The concave free-form surfaces of the first optical interface 11 and the third optical interface 21 can refract light to a preset light-emitting angle, and the light emission is more uniform, and the light field range can be very large. Compared with the prior art, for the same light field area, the present invention uses fewer light source devices, has a low production cost, and a small system volume, which is more conducive to optical integration.

[0041] Optimization scheme, X-axis, Y-axis, and Z-axis are spatial rectangular coordinate axes, and the plane formed by the X-axis and the Y-axis is defined as the XY plane; the plane formed by the X-axis and the Z-axis is defined as the XZ plane; the plane formed by the Y-axis and the Z-axis is defined as the YZ plane; the top-view projection planes of the first lens 1 and the second lens 2 are parallel to the XY plane.

[0042] The contour line of the projection of the first optical interface 11 on the XZ plane is the first contour line 111, and the contour line of the projection of the third optical interface 21 on the YZ plane is the second contour line 211. The first contour line 111 and the second contour line 211 are curves that are concave toward the second optical interface 12 and the fourth optical interface 22, respectively. The light is refracted by the first contour line 111 and the second contour line 211, and optical shaping is achieved in the XZ plane and the YZ plane, respectively, to achieve a preset divergence angle and uniform light output. Because the respective narrow and long ends of the first lens 1 and the second lens 2 are arranged at an angle, the effective optical area of ​​the optical lens is increased, and large-sized light-emitting chips can be adapted while ensuring the quality of optical shaping. Furthermore, the first contour line 111 and the second contour line 211 are axisymmetric curves, respectively, which are conducive to forming a symmetrical light field, such as a rectangular or quasi-rectangular light field.

[0043] The contour line of the projection of the first optical interface 11 on the YZ plane is the third contour line 112, and the third contour line 112 is a straight line or a curve that is concave toward the second optical interface 12. The third contour line 112 can be set as a curve as needed, and the curvature of the third contour line 112 is preferably less than or equal to the curvature of the first contour line 111. The third contour line 112 performs preliminary micro-shaping on the light in the YZ plane, and then the second contour line 211 performs large-angle deflection and shaping, and it is easy to form a preset high-quality light spot after two optical shapings.

[0044] The contour line of the third optical interface 21 in the XZ plane is the fourth contour line 212, and the fourth contour line 212 is a straight line or a curve that is concave toward the fourth optical interface 22. The fourth contour line 212 is preferably a curve, and the curvature of the fourth contour line 212 is less than or equal to the curvature of the second contour line 211. After the light is refracted and shaped at a large angle by the first contour line 111 in the XZ plane, it is micro-shaped by the fourth contour line 212. After two optical shapings, it is easy to form a preset high-quality light spot. The second optical interface 12 and the fourth optical interface 22 can be set as a plane or a free-form surface as needed.

[0045] Example 1: Reference Figure 1-3 The first contour line 111 of the first optical interface 11 is a curve, and the third contour line 112 is a straight line. The second contour line 211 of the third optical interface 21 is a curve, and the fourth contour line 212 is a straight line.

[0046] Example 2: Reference Figure 4-7, the first contour line 111 of the first optical interface 11 is a curve, and the third contour line 112 is a curve. The second contour line 211 of the third optical interface 21 is a curve, and the fourth contour line 212 is a curve. The linear lengths of the first optical interface 11 in the X-axis direction and the Y-axis direction are L1 and L2, satisfying L1 < L2, that is, the Y-axis is the long and narrow direction of the first lens 1. The linear lengths of the third optical interface 21 in the X-axis direction and the Y-axis direction are H1 and H2, satisfying H1 > H2, that is, the X-axis is the long and narrow direction of the second lens 2.

[0047] For the light source device using the optical lens of the present invention, refer to Figure 8-9 , it further includes a light-emitting chip 3. The light-emitting chip 3 is disposed below the first optical interface 11. A plurality of light-emitting holes 31 are provided on the light-emitting chip 3, and the plurality of light-emitting holes 31 are arranged in a regular array or randomly. The light-emitting chip 3 is preferably a VCSEL chip. The optical axis of the light-emitting chip 3 is parallel or overlapped with the center line in the Z-axis direction of the first optical interface 11 and the third optical interface 21. Preferably, the second lens 2 completely covers the first lens 1, and the first lens 1 completely covers the light-emitting chip 3, that is, the top view projection areas of the third optical interface 21, the first optical interface 11, and the light-emitting chip 3 decrease in sequence.

[0048] The present invention is not limited thereto, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical lens, characterized in that: It includes a first lens (1) and a second lens (2) covering the first lens (1) in sequence from bottom to top; The first lens (1) includes a first optical interface (11) for inputting light rays and a second optical interface (12) for outputting light rays from bottom to top; the first lens (1) is a long and narrow lens formed by the extension of the first optical interface (11) and the second optical interface (12) in a certain direction; The second lens (2) includes a third optical interface (21) for inputting light rays and a fourth optical interface (22) for outputting light rays from bottom to top; the second lens (2) is a long and narrow lens formed by the extension of the third optical interface (21) and the fourth optical interface (22) in a certain direction; the long and narrow direction of the first lens (1) is set at a certain angle to the long and narrow direction of the second lens (2); The first optical interface (11) is a free-form surface recessed into the interior of the first lens (1), and the third optical interface (21) is a free-form surface recessed into the interior of the second lens (2).

2. The optical lens according to claim 1, wherein: The contour line of the projection of the first optical interface (11) on the XZ plane is a first contour line (111), and the contour line of the projection of the third optical interface (21) on the YZ plane is a second contour line (211); The first contour line (111) and the second contour line (211) are curves recessed into the interiors of the first lens (1) and the second lens (2) respectively; The X-axis, Y-axis, and Z-axis are three-dimensional rectangular coordinate axes. The plane formed by the X-axis and Y-axis is defined as the XY plane, the plane formed by the X-axis and Z-axis is defined as the XZ plane, and the plane formed by the Y-axis and Z-axis is defined as the YZ plane. The top-down projection planes of the first lens (1) and the second lens (2) are parallel to the XY plane.

3. The optical lens according to claim 2, wherein: The first contour line (111) and the second contour line (211) are axisymmetric curves respectively.

4. The optical lens according to claim 2, wherein: The contour line of the projection of the first optical interface (11) on the YZ plane is a third contour line (112), and the third contour line (112) is a straight line or a curve recessed into the interior of the first lens (1); 5. The optical lens according to claim 4, wherein: When the third contour line (112) is a curve, the curvature of the third contour line (112) is less than or equal to the curvature of the first contour line (111).

6. The optical lens according to claim 2, wherein: The contour line of the third optical interface (21) on the XZ plane is a fourth contour line (212), and the fourth contour line (212) is a straight line or a curve recessed into the interior of the second lens (2); 7. The optical lens according to claim 6, wherein: When the fourth contour line (212) is a curve, the curvature of the fourth contour line (212) is less than or equal to the curvature of the second contour line (211).

8. The optical lens according to claim 2, wherein: The linear lengths of the first optical interface (11) in the X-axis direction and Y-axis direction are L1 and L2, satisfying L1 < L2; the linear lengths of the third optical interface (21) in the X-axis direction and Y-axis direction are H1 and H2, satisfying H1 > H2.

9. A light source device, characterized in that: The optical lens comprises any one of claims 1 to 8, and further comprises a light-emitting chip (3), wherein the light-emitting chip (3) is arranged below the first optical interface (11), and a plurality of light-emitting holes (31) are arranged on the light-emitting chip (3), and the light-emitting holes (31) are distributed in a regular array or randomly.

10. The light source device according to claim 9, characterized in that: The center line of the light-emitting surface of the light-emitting chip (3) is arranged parallel to or overlaps with the center lines of the first lens (1) and the second lens (2).

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