CN112285812A - Lens and VCSEL device adopting same - Google Patents

Lens and VCSEL device adopting same Download PDF

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Publication number
CN112285812A
CN112285812A CN201910661381.0A CN201910661381A CN112285812A CN 112285812 A CN112285812 A CN 112285812A CN 201910661381 A CN201910661381 A CN 201910661381A CN 112285812 A CN112285812 A CN 112285812A
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CN
China
Prior art keywords
lens
optical interface
light
vcsel
vcsel chip
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Pending
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CN201910661381.0A
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Chinese (zh)
Inventor
黄伟
曹宇星
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Raysees Technology Shenzhen Co ltd
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Raysees Technology Shenzhen Co ltd
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Priority to CN201910661381.0A priority Critical patent/CN112285812A/en
Publication of CN112285812A publication Critical patent/CN112285812A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0916—Adapting the beam shape of a semiconductor light source such as a laser diode or an LED, e.g. for efficiently coupling into optical fibers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/095—Refractive optical elements
    • G02B27/0955—Lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/095—Refractive optical elements
    • G02B27/0955—Lenses
    • G02B27/0966—Cylindrical lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B2003/0093—Simple or compound lenses characterised by the shape

Abstract

The invention is suitable for the technical field of photoelectricity, and provides a lens and a VCSEL device adopting the lens. The VCSEL chip comprises a functional region and a VCSEL chip, wherein the functional region comprises a first optical interface positioned at the bottom of the lens and a second optical interface positioned at the upper part of the lens, and a light beam emitted by the VCSEL chip is projected to the first optical interface of the functional region and refracted by the first optical interface, so that the light beam angle is increased and is close to a preset light emergent angle; the light beam enters the lens from the first optical interface, exits from the second optical interface of the functional area, is refracted by the second optical interface, and is optimized and shaped to meet the requirements of a preset light-emitting angle and a light spot; wherein the preset light-emitting angle range is 20-120 degrees. Therefore, the light emitting angle of the VCSEL device adopting the lens is enlarged, the effective irradiation range is large, light is homogenized, light spots emitted by the lens are uniform, and various application requirements can be met.

Description

Lens and VCSEL device adopting same
Technical Field
The invention belongs to the technical field of photoelectricity, and particularly relates to a lens and a VCSEL device using the lens.
Background
At present, a VCSEL (Vertical Cavity Surface Emitting Laser) chip adopts an engineering beam expander 4 (diffuiser) to expand the beam, where the engineering beam expander 4 is formed by adhering a polymer layer 42 on the Surface of a flat glass 41, and performing light diffusion by using a micro-refraction technique (including refraction and diffraction), as shown in fig. 15. Because the total reflection of the plate glass 41 is more, and the microstructure of the upper polymer layer 42 is added, the optical loss is caused, and in the actual test, the optical loss of the VCSEL chip after being expanded by the engineering beam expander is more than 10%, so the light-emitting efficiency is lower. And the high polymer layer is easy to melt at high temperature and fall off or fails due to glue infiltration and pollutant filling, laser beams with extremely high energy are directly irradiated out, and potential safety hazards of human eyes exist during use.
Disclosure of Invention
The embodiment of the invention aims to provide a lens, and aims to solve the problems of low reliability and low light emitting efficiency of the existing engineering beam expander (diffuiser).
The embodiment of the invention is realized in such a way that a lens is a divergent lens with a functional region, the lens is used for expanding light beams emitted by a VCSEL chip, the functional region comprises a first optical interface positioned at the bottom of the lens and a second optical interface positioned at the upper part of the lens, the light beams emitted by the VCSEL chip are projected to the first optical interface of the functional region and are refracted by the first optical interface, the angle of the light beams is increased and is close to a preset light-emitting angle; the light beam enters the lens from the first optical interface, exits from the second optical interface of the functional area, is refracted by the second optical interface, and is optimized and shaped to meet the requirements of a preset light-emitting angle and a light spot; wherein the preset light-emitting angle range is 20-120 degrees.
Another embodiment of the present invention is implemented as follows, a VCSEL device includes a VCSEL chip, a bracket for fixing the VCSEL chip, and a lens for expanding a beam emitted from the VCSEL chip, where the lens is a divergent lens having a functional region, the functional region includes a first optical interface located at a bottom of the lens and a second optical interface located at an upper portion of the lens, and the beam emitted from the VCSEL chip is projected to the first optical interface of the functional region and refracted by the first optical interface, so that a beam angle is increased and approaches a preset light-emitting angle; the light beam enters the lens from the first optical interface, exits from the second optical interface of the functional area, is refracted by the second optical interface, and is optimized and shaped to meet the requirements of a preset light-emitting angle and a light spot; wherein the preset light-emitting angle range is 20-120 degrees.
The lens that this embodiment provided does not establish the macromolecular layer, does not exist because of the easy high temperature melting of macromolecular layer and drop or glue infiltration and the inefficacy that the pollutant was filled and is caused human eye potential safety hazard problem, and the light-emitting efficiency is high moreover. The lens is a divergent lens with a functional area and is used for expanding the light beams emitted by the VCSEL chip. The VCSEL chip comprises a functional region and a VCSEL chip, wherein the functional region comprises a first optical interface positioned at the bottom of the lens and a second optical interface positioned at the upper part of the lens, and a light beam emitted by the VCSEL chip is projected to the first optical interface of the functional region and refracted by the first optical interface, so that the light beam angle is increased and is close to a preset light emergent angle; the light beam enters the lens from the first optical interface, exits from the second optical interface of the functional area, is refracted by the second optical interface, and is optimized and shaped to meet the requirements of a preset light-emitting angle and a light spot; wherein the preset light-emitting angle range is 20-120 degrees. Therefore, the light emitting angle of the VCSEL device adopting the lens is enlarged, the effective irradiation range is large, light is homogenized, light spots emitted by the lens are uniform, and various application requirements can be met.
Drawings
FIG. 1 is a block diagram of a lens and VCSEL chip (showing some of the relationships where a first optical interface is formed by a rotationally symmetric curve rotated about the optical axis of the lens) provided by an embodiment of the present invention;
FIG. 2 is a block diagram of a lens and VCSEL chip provided by an embodiment of the present invention (showing another partial relationship where the first optical interface is formed by a rotationally symmetric curve rotated about the optical axis of the lens);
fig. 3 is an optical diagram of light emission of a VCSEL chip provided by an embodiment of the present invention (no lens is added);
FIG. 4 is an optical diagram of the luminescence of a VCSEL chip provided by an embodiment of the present invention (with the addition of a lens where the first optical interface is formed by a rotationally symmetric curve rotated about the optical axis of the lens);
FIG. 5 is a structural diagram of a lens and a VCSEL chip provided in an embodiment of the invention (here, the first optical interface is an ellipsoid and the short axis direction);
FIG. 6 is a structural diagram of a lens and a VCSEL chip provided in an embodiment of the invention (here, the first optical interface is an ellipsoid and the long axis direction);
FIG. 7 is a structural view of a lens provided by an embodiment of the present invention (biconcave lens);
FIG. 8 is a structural view of a lens (meniscus) provided by an embodiment of the present invention;
FIG. 9 is a block diagram of a lens array provided by an embodiment of the present invention;
FIG. 10 is a schematic diagram of a diced lens array;
FIG. 11 is a schematic structural diagram of a VCSEL device provided by an embodiment of the present invention (a lens is fixed to a support through an adhesive medium);
fig. 12 is a schematic structural diagram of a VCSEL device according to an embodiment of the present invention (the lens is fixed to the bracket by an adhesive medium and a snap-fit manner at the same time);
fig. 13 is a schematic structural diagram of a VCSEL device according to an embodiment of the present invention (side protection device);
FIG. 14 is a schematic diagram of a diced VCSEL device array;
fig. 15 is a schematic structural diagram of an engineered beam expander provided in the prior art.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The lens that this embodiment provided does not establish the macromolecular layer, does not exist because of the easy high temperature melting of macromolecular layer and drop or glue infiltration and the inefficacy that the pollutant was filled and is caused human eye potential safety hazard problem, and the light-emitting efficiency is high moreover. The lens is a divergent lens with a functional area and is used for expanding the light beams emitted by the VCSEL chip. The VCSEL chip comprises a functional region and a VCSEL chip, wherein the functional region comprises a first optical interface positioned at the bottom of the lens and a second optical interface positioned at the upper part of the lens, and a light beam emitted by the VCSEL chip is projected to the first optical interface of the functional region and refracted by the first optical interface, so that the light beam angle is increased and is close to a preset light emergent angle; the light beam enters the lens from the first optical interface, exits from the second optical interface of the functional area, is refracted by the second optical interface, and is optimized and shaped to meet the requirements of a preset light-emitting angle and a light spot; wherein the preset light-emitting angle range is 20-120 degrees. Therefore, the light emitting angle of the VCSEL device adopting the lens is enlarged, the effective irradiation range is large, light is homogenized, light spots emitted by the lens are uniform, and various application requirements can be met.
The following describes the implementation of the present invention in detail with reference to specific embodiments.
As shown in fig. 1 to 6, a lens 1 provided in an embodiment of the present invention is a divergent lens having a functional region 10, where the lens 1 is configured to expand a light beam emitted by a VCSEL chip 2, the functional region 10 includes a first optical interface 18 located at a bottom of the lens and a second optical interface 19 located at an upper portion of the lens, the light beam emitted by the VCSEL chip 2 is projected to the first optical interface 18 of the functional region, and is refracted by the first optical interface 18, so that a light beam angle is increased and approaches a preset light exit angle; the light beam enters the lens 1 from the first optical interface 18, exits from the second optical interface 19 of the functional area, is refracted by the second optical interface 19, and is optimized and shaped to meet the requirements of a preset light-emitting angle and a light spot; wherein the preset light-emitting angle range is 20-120 degrees. Therefore, the light emitting angle of the VCSEL device adopting the lens is enlarged, the effective irradiation range is large, light is homogenized, light spots emitted by the lens 1 are uniform, and various application requirements can be met. Because the lens 1 is not provided with the macromolecule layer, the problem of potential safety hazard of human eyes caused by failure caused by high-temperature melting and falling of the macromolecule layer or glue infiltration and pollutant filling does not exist, and the light-emitting efficiency is high.
As shown in fig. 1, 2, and 4, as an embodiment of the present invention, the first optical interface 18 is formed by rotating a rotationally symmetric curve around an optical axis of a lens, and a light spot formed by light beams emitted from the VCSEL chip 2 exiting through the lens 1 is circular or square. As shown in fig. 5 and 6, as another embodiment of the present invention, the first optical interface 18 is an ellipsoid or a cylinder, and a light spot formed by the light beam emitted from the VCSEL chip 2 exiting through the lens 1 is an ellipse or a rectangle. Specifically, fig. 5 shows the optical path of the first optical interface in the direction of its minor axis as an ellipsoid; fig. 6 shows the optical path of the first optical interface as an ellipsoid in the direction of its long axis. Thus basically meeting the requirements of various occasions on the shape of the light spot.
Preferably, the relationship between the lens 1 and the VCSEL chip 2 satisfies the following mathematical expression: b is more than or equal to A + H Tan (theta), Wz＝W0[1+(Z/f)^2]^(1/2)，W1＝λF1/{πW0[1+(Z/f)^2](1/2) }, wherein f ═ π W0Lambda 2/Lambda is Rayleigh length, Lambda is wavelength, F1Is the focal length of the lens 1, Z is the distance from the spot to the VCSEL chip 2, W0Beam waist radius, W, of light emitted from the VCSEL chip 2zIs the radius of the spot, W1The beam waist radius of the light emitted by the VCSEL chip 2 after passing through the lens 1 is determined by A, the effective length of a light emitting region of the VCSEL chip 2, B, the length of the lens function region 10, H, the distance from the lens 1 to the VCSEL chip 2 and theta, which is a half of the divergence angle of the light emitted by the VCSEL chip 2. It should be noted that the values of the above parameters are determined according to actual requirements.
As shown in fig. 1, 2, 4, 5 and 6, in the embodiment of the present invention, the lens 1 is a plano-concave lens, and the first optical interface 18 of the functional region 10 is an inner concave surface; the top surface 11 of the lens opposite the first optical interface 18 is a plane having a length less than the length B of the functional region 10 and greater than the effective length a of the light emitting region of the VCSEL chip 2. The functional area of this lens 1 is less, just can with through very little area the light that VCSEL chip 2 sent expands the beam, is favorable to the light source product miniaturization, has bigger design space in the application, and material cost can practice thrift more simultaneously.
As shown in fig. 7, as an embodiment of the present invention, the lens 1 is a biconcave lens, and the first optical interface 18 of the functional region 10 is an inner concave surface; the top surface 11 of the lens opposite the first optical interface 18 is a concave surface. As shown in fig. 8, as another embodiment of the present invention, the lens 1 is a meniscus lens, and the first optical interface 18 of the functional region 10 is a concave surface; the top surface 11 of the lens opposite the first optical interface 18 is an outer convex surface. The shape of the lens is flexible and changeable, and the lens can meet the light emitting requirement after being assembled as long as the designed focal length of the lens is proper.
Furthermore, the side surface 12 and the bottom surface 13 of the lens are both flat surfaces, the side surface 12 is connected with the top surface 11 through a first curved surface 14, and the height of the side surface 12 is smaller than that of the top surface 11; wherein the second optical interface 19 includes a top surface 11 and a first curved surface 14 partially adjacent to the top surface 11. The sample lens 1 is convenient to process and manufacture and low in production cost.
It should be noted that, the first optical interface and the second optical interface of the functional region are both rotationally symmetric or axially symmetric curved surfaces or free curved surfaces, and their curvature ranges are large, but they have a common characteristic that the focal length of the lens can be adjusted through the curvature.
As shown in fig. 9 and 10, in order to improve the production efficiency, a single lens 1 is cut from the lens array 6, and the lens array 6 is formed by injection molding or die pressing of transparent glue with the light transmittance of more than 90%; the material of the light-transmitting glue is PC, PMMA, epoxy, silicon resin or silica gel, and the refractive index of the light-transmitting glue is larger than 1.4.
As shown in fig. 1 to 14, an embodiment of the present invention further provides a VCSEL device 7, which includes a VCSEL chip 2, a bracket 3 for fixing the VCSEL chip 2, and a lens 1 for expanding a beam emitted from the VCSEL chip 2, wherein the lens 1 is a divergent lens having a functional region 10, the functional region 10 includes a first optical interface 18 located at a bottom of the lens and a second optical interface 19 located at an upper portion of the lens, the beam emitted from the VCSEL chip 2 is projected onto the first optical interface 18 of the functional region, and is refracted by the first optical interface 18, so that an angle of the beam is increased and approaches a preset light-emitting angle; the light beam enters the lens 1 from the first optical interface 18, exits from the second optical interface 19 of the functional area, is refracted by the second optical interface 19, and is optimized and shaped to meet the requirements of a preset light-emitting angle and a light spot; wherein the preset light-emitting angle range is 20-120 degrees. Therefore, the light-emitting angle of the VCSEL device is enlarged, the effective irradiation range is large, light is homogenized, light spots emitted by the lens 1 are uniform, and various application requirements can be met. Because this lens 1 does not establish the macromolecular layer, does not exist because of the potential safety hazard problem that the macromolecular layer drops easily or became invalid and cause, and the light-emitting efficiency is high moreover.
Preferably, the relationship between the lens 1 and the VCSEL chip 2 satisfies the following mathematical expression: b is more than or equal to A + H Tan (theta), Wz＝W0[1+(Z/f)^2]^(1/2)，W1＝λF1/{πW0[1+(Z/f)^2](1/2) }, wherein f ═ π W0Lambda 2/Lambda is Rayleigh length, Lambda is wavelength, F1Is the focal length of the lens 1, Z is the distance from the spot to the VCSEL chip 2, W0Beam waist radius, W, of light emitted from the VCSEL chip 2zIs the radius of the spot, W1The beam waist radius of the light emitted by the VCSEL chip 2 after passing through the lens 1 is determined by A, the effective length of a light emitting region of the VCSEL chip 2, B, the length of the lens function region 10, H, the distance from the lens 1 to the VCSEL chip 2 and theta, which is a half of the divergence angle of the light emitted by the VCSEL chip 2. It should be noted that the values of the above parameters can be determined according to actual requirements.
As shown in fig. 3, the VCSEL chip 2 is a VCSEL array capable of emitting multiple laser cones, wherein three cones represent light emitted from different positions of the VCSEL array. When the lens 1 is not added, the light-emitting angle of the VCSEL chip 2 is about 20 degrees. After the lens 2 is added, the light-emitting angle of the VCSEL chip 2 is about 110 °, as shown in fig. 4.
Wherein, the divergence angle of the light emitted by the VCSEL chip 2 is generally 20-24 degrees; theta is half of the divergence angle of the light emitted by the VCSEL chip 2, namely 10-12 degrees.
As shown in fig. 11, the lens 1 may be fixed to the holder by an adhesive medium or in a snap-fit manner. Of course, the bracket can also be fixed on the bracket by the bonding medium and the buckling mode, as shown in fig. 12. A protection device 5 for cutting off the power supply of the VCSEL chip when the lens falls off is arranged beside the VCSEL device, as shown in fig. 13. Therefore, the safety coefficient of the VCSEL device is higher, and the VCSEL device really achieves the purpose of being extremely safe.
As shown in fig. 14, in order to improve the production efficiency, individual VCSEL devices 7 are cut from the VCSEL device array 8, which is formed by laminating a lens array and a corresponding holder array. The cutting can be only to cut the lens, the support is cut in advance, and the device can be separated by direct splitting. The bracket and the lens can also be cut synchronously at one time.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (21)

1. A lens, which is a diverging lens having a functional region, comprising: the lens is used for expanding light beams emitted by the VCSEL chip, the functional region comprises a first optical interface positioned at the bottom of the lens and a second optical interface positioned at the upper part of the lens, the light beams emitted by the VCSEL chip are projected to the first optical interface of the functional region and refracted by the first optical interface, and the light beam angle is increased and is close to a preset light emergent angle; the light beam enters the lens from the first optical interface, exits from the second optical interface of the functional area, is refracted by the second optical interface, and is optimized and shaped to meet the requirements of a preset light-emitting angle and a light spot; wherein the preset light-emitting angle range is 20-120 degrees.
2. The lens of claim 1, wherein: the first optical interface is formed by rotating a rotation symmetry curve around an optical axis of the lens, and light spots formed by light beams emitted by the VCSEL chip after being emitted by the lens are circular or square.
3. The lens of claim 1, wherein: the first optical interface is an ellipsoid or a cylindrical surface, and light spots formed by light beams emitted by the VCSEL chip after being emitted through the lens are oval or rectangular.
4. The lens of claim 1, 2 or 3, wherein: the lens is a plano-concave lens, and a first optical interface of the functional area of the lens is an inner concave surface; the top surface of the lens opposite the first optical interface is planar.
5. The lens of claim 1, 2 or 3, wherein: the lens is a biconcave lens, and a first optical interface of the functional region of the lens is an inner concave surface; the top surface of the lens opposite to the first optical interface is an inner concave surface.
6. The lens of claim 1, 2 or 3, wherein: the lens is a concave-convex lens, and a first optical interface of the functional area of the lens is an inner concave surface; the top surface of the lens opposite to the first optical interface is an outer convex surface.
7. The lens of claim 1, 2 or 3, wherein: the first optical interface and the second optical interface of the functional area are both rotationally symmetrical or axially symmetrical curved surfaces or free-form surfaces.
8. The lens of claim 1, 2 or 3, wherein: the side surface and the bottom surface of the lens are both planes, the side surface is connected with the top surface through a first curved surface, and the height of the side surface is smaller than that of the top surface; the second optical interface comprises a top surface and a first curved surface partially close to the top surface.
9. The lens of claim 1, 2 or 3, wherein: the lens is cut from the lens array, and the lens array is formed by injection molding or mould pressing of light-transmitting glue with light transmittance of more than 90%; the material of the light-transmitting glue is PC, PMMA, epoxy, silicon resin or silica gel, and the refractive index of the light-transmitting glue is larger than 1.4.
10. A VCSEL device comprising a VCSEL chip and a holder for holding the VCSEL chip, characterized in that: the VCSEL device further comprises a lens for expanding light beams emitted by the VCSEL chip, wherein the lens is a divergent lens with a function region, the function region comprises a first optical interface positioned at the bottom of the lens and a second optical interface positioned at the upper part of the lens, the light beams emitted by the VCSEL chip are projected to the first optical interface of the function region and are refracted by the first optical interface, the light beam angle is increased and is close to a preset light emergent angle; the light beam enters the lens from the first optical interface, exits from the second optical interface of the functional area, is refracted by the second optical interface, and is optimized and shaped to meet the requirements of a preset light-emitting angle and a light spot; wherein the preset light-emitting angle range is 20-120 degrees.
11. The VCSEL device of claim 10, wherein: the VCSEL chip is an array capable of emitting multiple beams of laser light cones.
12. The lens of claim 10, wherein: the first optical interface is formed by rotating a rotation symmetry curve around an optical axis of the lens, and light spots formed by light beams emitted by the VCSEL chip after being emitted by the lens are circular or square.
13. The lens of claim 10, wherein: the first optical interface is an ellipsoid or a cylindrical surface, and light spots formed by light beams emitted by the VCSEL chip after being emitted through the lens are oval or rectangular.
14. The lens of claim 12 or 13, wherein: the lens is a plano-concave lens, and a first optical interface of the functional area of the lens is an inner concave surface; the top surface of the lens opposite the first optical interface is planar.
15. The lens of claim 12 or 13, wherein: the lens is a biconcave lens, and a first optical interface of the functional region of the lens is an inner concave surface; the top surface of the lens opposite to the first optical interface is an inner concave surface.
16. The lens of claim 12 or 13, wherein: the lens is a concave-convex lens, and a first optical interface of the functional area of the lens is an inner concave surface; the top surface of the lens opposite to the first optical interface is an outer convex surface.
17. The lens of claim 12 or 13, wherein: the first optical interface and the second optical interface of the functional area are both rotationally symmetrical or axially symmetrical curved surfaces or free-form surfaces.
18. The lens of claim 12 or 13, wherein: the side surface and the bottom surface of the lens are both planes, the side surface is connected with the top surface through a first curved surface, and the height of the side surface is smaller than that of the top surface; the second optical interface includes a top surface and a first curved surface partially adjacent to the top surface.
19. A VCSEL device in accordance with claim 12 or 13, wherein: the lens is fixed on the bracket through an adhesive medium or in a buckling mode.
20. A VCSEL device in accordance with claim 12 or 13, wherein: the VCSEL device is cut from a VCSEL device array, and the VCSEL device array is formed by pressing a lens array and a corresponding support array.
21. A VCSEL device in accordance with claim 12 or 13, wherein: and a protection device for cutting off the power supply of the VCSEL chip when the lens falls off is arranged beside the VCSEL device.
CN201910661381.0A 2019-07-22 2019-07-22 Lens and VCSEL device adopting same Pending CN112285812A (en)

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Application publication date: 20210129