CN207301461U - Projection lens system - Google Patents
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- CN207301461U CN207301461U CN201721188628.4U CN201721188628U CN207301461U CN 207301461 U CN207301461 U CN 207301461U CN 201721188628 U CN201721188628 U CN 201721188628U CN 207301461 U CN207301461 U CN 207301461U
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Abstract
The utility model discloses a kind of projection lens system, the projection lens system includes successively from the object side to image side along optical axis：The first lens with positive light coke, its thing side surface are convex surface；The second lens with negative power；The 3rd lens with positive light coke, its image side surface are convex surface；Diaphragm；The optical centre of each lens is located along the same line.The projection lens system, can be with eyeglass in itself and the influence of thermal expansion focusing that brings of structural member is cancelled out each other since the refractive index variation with temperature rate distribution of each eyeglass is reasonable, and institute is so as to realize focal length stabilization and suitable for different temperature occasions.
Description
Technical field
Pick-up lens technical field is the utility model is related to, more particularly to a kind of projection lens system.
Background technology
With the fast development of smart mobile phone, the camera function of mobile phone also continues to bring out out the technology of innovation, such as apple
The 3D imaging technique that company promotes mainly, this optical sensing techniques based on 3D structure lights, recognize available for face, gesture, strengthen
Camera function, brings AR new opplications, and optical imagery is changed from past two dimension to three dimensions, thus bring it is more true,
Clearly sensory experience.
3D structure lights refer to after specific laser intelligence is projected body surface, are gathered by camera, are made according to object
Into the information such as position and depth of the change to calculate object of optical information, and then restore whole three dimensions.Specific laser
Information is a very important index in 3D structured light techniques, therefore to laser intelligence is projected to testee surface
Projection lens system requires very high.It is this that VCSEL (vertical cavity surface emitting laser) facet surface is had specific solid angle
The array point light source of transmitting projects to the projection lens system on testee surface, is a key link of 3D image quality.
In existing projection lens system class product, exist as the change of use environment temperature, lens focus f occur
The problem of large change, this can cause the angle of camera lens projection light that significant change occurs, change original optical information, so as to cause
There is error in the calculating of whole system, influences the profile recovery accuracy of three-dimensional body；Equally also exist with the change of environment temperature
The problem of change, the picture point of projection becomes larger, this clarity for also resulting in system reducing three-dimensional body decline.
Utility model content
The utility model is intended at least solve one of technical problem existing in the prior art.For this reason, the utility model
Purpose is to propose a kind of projection lens system that can be realized focal length under different temperature occasions and stablize.
According to projection lens system provided by the utility model, include successively from the object side to image side along optical axis：
The first lens with positive light coke, its thing side surface are convex surface；
The second lens with negative power；
The 3rd lens with positive light coke, its image side surface are convex surface；
Diaphragm；Wherein, diaphragm be arranged on the 3rd lens after, can effective limiting aperture, easy to optical design；
The optical centre of each lens is located along the same line；
The projection lens system meets the following conditions：
f12>f3；
(dn/dt)1<-50×10-6/℃；
(dn/dt)2<-50×10-6/℃；
(dn/dt)3>-10×10-6/℃；
Wherein, f12 represents the combined focal length of first lens and second lens, and f3 represents the 3rd lens
Focal length, (dn/dt) 1, (dn/dt) 2, (dn/dt) 3 represent first lens, second lens, the 3rd lens respectively
Refractive index variation with temperature rate.
The projection lens system of the utility model, can since the refractive index variation with temperature rate distribution of each eyeglass is reasonable
With eyeglass in itself and the influence of thermal expansion focusing that brings of structural member is cancelled out each other, so as to realizing different temperature occasions
Lower focal length keeps stablizing；And the projection lens system can reach temperature and often change 10 DEG C, the effective focal length of projection lens system
Variable quantity is less than 0.0005mm, so that significant change does not occur for the angle of camera lens projection light, does not change original optical information.
Further, the projection lens system meets conditional：
0 ＜ f3/f1 ＜ 3.5；
Wherein, f3 represents the focal length of the 3rd lens, and f1 represents the focal length of first lens.
Further, the projection lens system meets conditional：
- 5 ＜ f/r6 ＜ 0；
Wherein, f represents the system focal length of the projection lens system, and r6 represents the curvature on the 3rd lens image side surface
Radius.
Further, the projection lens system meets conditional：
- 5.5 ＜ r1/r6 ＜ 0；
Wherein, r1 represents the radius of curvature of the first lens thing side surface, and r6 represents the 3rd lens image side surface
Radius of curvature.
Further, the projection lens system meets conditional：
0.5 ＜ CT3/CT2 ＜ 7.5；
Wherein, CT2 represents the center thickness of second lens, and CT3 represents the center thickness of the 3rd lens.
Further, first lens, each thing side surface of second lens and the 3rd lens and image side table
Face is aspherical.
Further, first lens and second lens are plastic cement material, and the 3rd lens are glass material.
Further, in first lens, second lens and the 3rd lens any two adjacent lens it
Between there is airspace.
Further, first lens, second lens and the 3rd lens are unbonded separate lenses.
Further, the aspherical surface shape of each lens is satisfied by following equations in the projection lens system：
Wherein, z represents that curved surface leaves distance of the curved surface vertex in optical axis direction, and c represents the curvature on curved surface vertex, and K is represented
Quadratic surface coefficient, h represent optical axis to the distance of curved surface, and B, C, D, E and F represent quadravalence, six ranks, eight ranks, ten ranks and ten respectively
Surface of second order coefficient.
The advantages of the utility model, will be set forth in part in the description, and partly will become bright from the following description
It is aobvious, or recognized by the practice of the utility model.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the utility model will in the description from combination accompanying drawings below to embodiment
Become obvious and be readily appreciated that, wherein：
Fig. 1 is the cross section structure schematic diagram according to the projection lens system of one embodiment of the utility model；
Fig. 2 a are field of the projection lens system at 40 DEG C, the imaging of 300mm image distances in the utility model embodiment 1
Bent curve map, x-axis is curvature of field value in figure, and coordinate unit is millimeter, and y-axis is the visual field with the high definition of thing；
Fig. 2 b are that the projection lens system in the utility model embodiment 1 is abnormal at 40 DEG C, the imaging of 300mm image distances
Varied curve figure, x-axis is distortion value in figure, and coordinate unit is percentage, and y-axis is the visual field with the high definition of thing；
Fig. 3 is projection lens system in the utility model embodiment 1 at 40 DEG C, picture point when 300mm image distances are imaged
The schematic diagram of size and shape, unit are micron；
Fig. 4 is the cross section structure schematic diagram of the projection lens system in the utility model embodiment 2；
Fig. 5 a are field of the projection lens system at 40 DEG C, the imaging of 300mm image distances in the utility model embodiment 2
Bent curve map, x-axis is curvature of field value in figure, and coordinate unit is millimeter, and y-axis is the visual field with the high definition of thing；
Fig. 5 b are that the projection lens system in the utility model embodiment 2 is abnormal at 40 DEG C, the imaging of 300mm image distances
Varied curve figure, x-axis is distortion value in figure, and coordinate unit is percentage, and y-axis is the visual field with the high definition of thing；
Fig. 6 is projection lens system in the utility model embodiment 2 at 40 DEG C, picture point when 300mm image distances are imaged
The schematic diagram of size and shape, unit are micron；
Fig. 7 is the cross section structure schematic diagram of the projection lens system in the utility model embodiment 3；
Fig. 8 a are field of the projection lens system at 40 DEG C, the imaging of 300mm image distances in the utility model embodiment 3
Bent curve map, x-axis is curvature of field value in figure, and coordinate unit is millimeter, and y-axis is the visual field with the high definition of thing；
Fig. 8 b are that the projection lens system in the utility model embodiment 3 is abnormal at 40 DEG C, the imaging of 300mm image distances
Varied curve figure, x-axis is distortion value in figure, and coordinate unit is percentage, and y-axis is the visual field with the high definition of thing；
Fig. 9 is projection lens system in the utility model embodiment 3 at 40 DEG C, picture point when 300mm image distances are imaged
The schematic diagram of size and shape, unit are micron；
Figure 10 is the cross section structure schematic diagram of the projection lens system in the utility model embodiment 4；
Figure 11 a be projection lens system in the utility model embodiment 4 at 40 DEG C, when 300mm image distances are imaged
Curvature of field curve map, x-axis is curvature of field value in figure, and coordinate unit is millimeter, and y-axis is the visual field with the high definition of thing；
Figure 11 b be projection lens system in the utility model embodiment 4 at 40 DEG C, when 300mm image distances are imaged
Distortion curve figure, x-axis is distortion value in figure, and coordinate unit is percentage, and y-axis is the visual field with the high definition of thing；
Figure 12 is projection lens system in the utility model embodiment 4 at 40 DEG C, picture point when 300mm image distances are imaged
The schematic diagram of size and shape, unit are micron；
Figure 13 is the cross section structure schematic diagram of the projection lens system in the utility model embodiment 5；
Figure 14 a be projection lens system in the utility model embodiment 5 at 40 DEG C, when 300mm image distances are imaged
Curvature of field curve map, x-axis is curvature of field value in figure, and coordinate unit is millimeter, and y-axis is the visual field with the high definition of thing；
Figure 14 b be projection lens system in the utility model embodiment 5 at 40 DEG C, when 300mm image distances are imaged
Distortion curve figure, x-axis is distortion value in figure, and coordinate unit is percentage, and y-axis is the visual field with the high definition of thing；
Figure 15 is projection lens system in the utility model embodiment 5 at 40 DEG C, picture point when 300mm image distances are imaged
The schematic diagram of size and shape, unit are micron；
Figure 16 is the cross section structure schematic diagram of the projection lens system in the utility model embodiment 6；
Figure 17 a be projection lens system in the utility model embodiment 6 at 40 DEG C, when 300mm image distances are imaged
Curvature of field curve map, x-axis is curvature of field value in figure, and coordinate unit is millimeter, and y-axis is the visual field with the high definition of thing；
Figure 17 b be projection lens system in the utility model embodiment 6 at 40 DEG C, when 300mm image distances are imaged
Distortion curve figure, x-axis is distortion value in figure, and coordinate unit is percentage, and y-axis is the visual field with the high definition of thing；
Figure 18 is projection lens system in the utility model embodiment 6 at 40 DEG C, picture point when 300mm image distances are imaged
The schematic diagram of size and shape, unit are micron.
Embodiment
To enable the purpose of this utility model, feature and advantage more obvious understandable, below in conjunction with the accompanying drawings to this practicality
New embodiment is described in detail.Some embodiments of the utility model are given in attached drawing.But this practicality
It is new to realize in many different forms, however it is not limited to embodiment described herein.On the contrary, provide these implementations
The purpose of example is the disclosure more thorough and comprehensive made to the utility model.
Referring to Fig. 1, the projection lens system that an embodiment of the utility model provides, along optical axis from the object side to image side
Include successively：
The first lens L1 with positive light coke, its thing side surface are convex surface；
The second lens L2 with negative power；
The 3rd lens L3 with positive light coke, its image side surface are convex surface；
Diaphragm S7；Diaphragm S7 be arranged on the 3rd lens L3 after, can effective limiting aperture, easy to optical design；
The optical centre of each lens is located along the same line；
The projection lens system meets the following conditions：
f12>f3；
(dn/dt)1<-50×10-6/℃；
(dn/dt)2<-50×10-6/℃；
(dn/dt)3>-10×10-6/℃；
Wherein, f12 represents the combined focal length of the first lens L1 and the second lens L2, and f3 represents that the described 3rd is saturating
The focal length of mirror L3, (dn/dt) 1, (dn/dt) 2, (dn/dt) 3 represent the first lens L1, the second lens L2, institute respectively
State the refractive index variation with temperature rate of the 3rd lens L3.
The first lens L1, the second lens L2 combined focal length f12 and the 3rd lens L3 focal length f3 difference
More than 0, that is, meet condition f12>f3.This condition limits the first lens L1, the second lens L2 combination and the 3rd lens L3
It is weaker compared to the converging power to light.
The refractive index variation with temperature rate (dn/dt) 1 of the first lens L1, the second lens L2 and the 3rd lens L3,
(dn/dt) 2 and (dn/dt) 3 meets condition (dn/dt) 1<-50×10-6/ DEG C, (dn/dt) 2<-50×10-6/ DEG C, (dn/dt) 3
>-10×10-6/℃.This condition limits the refractive index variation with temperature rate of three lens, is mainly used for reasonably combined eyeglass
Thermal expansion, ensure the stability of lens focus at different temperatures.
Above-mentioned projection lens system, can be with eyeglass sheet since the refractive index variation with temperature rate distribution of each eyeglass is reasonable
The influence for the thermal expansion focusing that body and structural member are brought is cancelled out each other, so as to realizing under different temperature occasions that focal length is protected
It is fixed to keep steady；And the projection lens system can reach temperature and often change 10 DEG C, the effective focal length variable quantity of projection lens system is small
In 0.0005mm, so that significant change does not occur for the angle of camera lens projection light, original optical information is not changed.
Specifically, in the projection lens system, the first lens L1 has positive light coke, its thing side surface S1 is convex
Face, its thing side surface S1 and image side surface S2 are all aspherical, converge the telecentric beam from laser, and collocation first whereby
Lens provide enough positive light cokes, can efficiently control the overall volume of optical lens group.
The second lens L2 has negative power, its thing side surface S3 and image side surface S4 be all it is aspherical, can be effective
Aberration caused by the first lens of ground reconciliation, can also control the focusing power of service band.
The 3rd lens L3 has positive light coke, its image side surface S6 is convex surface, its thing side surface S5 and image side surface
S6 is all aspherical, can effectively correct the aberration of optical lens, and efficiently control shooting angle.
Each the thing side surface and image side surface of the first lens L1, the second lens L2 and the 3rd lens L3 are all aspheric
Two surfaces of each lens are fabricated to the shape beyond sphere, more controlled variable can be obtained whereby, to cut down picture by face
Difference.
It is in other words, the first lens L1, second saturating using the unbonded separate lenses of three pieces in above-mentioned projection lens system
In mirror L2 and the 3rd lens L3, with an airspace between any two adjacent lens with focal power, due to cemented lens
The more non-adhering lens of technique it is complicated, especially must possess the curved surface of high accuracy in the adhesive surface of two lens, to reach two lens
High adaptation during bonding, and in adhesion process, can also because off normal and caused by adaptation it is bad, image optics imaging product
Matter.And in the projection lens system of present embodiment, using the unbonded separate lenses of three pieces, cemented lens can be effectively improved
The problem that.
In optical lens group provided by the utility model, the first lens L1, the second lens L2 can be plastic cement material, so as to
Effectively reduce production cost；3rd lens L3 can be glass material, to ensure when operating temperature changes, system resolving power
Significant change does not occur.
Further, the projection lens system meets conditional：
0 ＜ f3/f1 ＜ 3.5；
Wherein, f3 represents the focal length of the 3rd lens L3, and f1 represents the focal length of the first lens L1.This condition limits
The proportioning of the first lens L1 and the 3rd lens L3 focal lengths, be mainly used for by by the convergence of rays of the first lens L1 in into
In image planes, while reduce the aberration of the projection lens system.
Further, the projection lens system meets conditional：
- 5 ＜ f/r6 ＜ 0；
Wherein, f represents the system focal length of the projection lens system, and r6 represents the 3rd lens L3 image sides surface S6's
Radius of curvature.
Further, the projection lens system meets conditional：
- 5.5 ＜ r1/r6 ＜ 0；
Wherein, r1 represents the radius of curvature of the first lens L1 things side surface S1, and r6 represents the 3rd lens L3 pictures
The radius of curvature of side surface S6.This condition limits the first lens L1 things side surface S1 and the 3rd lens L3 image sides surface S6
Direction on the contrary, being mainly used on imaging surface, while the projection being reduced by the convergence of rays of the first lens L1
The aberration of lens system.
Further, the projection lens system meets conditional：
0.5 ＜ CT3/CT2 ＜ 7.5；
Wherein, CT2 represents the center thickness of the second lens L2, and CT3 represents the center thickness of the 3rd lens L3.
This condition limits the proportioning of the center thickness of the 3rd lens L3 and the center thickness of the second lens L2, by appropriately configured
The center thickness of lens, is conducive to the processing and manufacturing and assembling of optical lens group.
Divide multiple embodiments that the utility model is further detailed below.In following each embodiment, projection
The thickness of each lens in lens system, radius of curvature are different, the specific different parameter lists that can be found in each embodiment.
Following embodiments are only the better embodiment of the utility model, but the embodiment of the utility model is not merely by following realities
The limitation of example is applied, the other any change made without departing from the utility model innovative point, replacement, combination or simplification, should all regard
For equivalent substitute mode, it is included within the scope of protection of the utility model.
In all embodiments of the utility model, f represents the effective focal length of the projection lens system, and NA represents numerical value
Aperture, r represent the radius of curvature on optical surface vertex, and d represents optical surface spacing (between two adjacent optical surface vertex
Distance), ndRepresent the refractive index of each lens, Vd represents the Abbe number of each lens, can be used to weigh the light color of medium
The degree of dissipating, TTL represent the optics overall length of the projection lens system.
The aspherical surface shape of each lens in each embodiment of the utility model is satisfied by following equations：
Wherein, z represents that curved surface leaves distance of the curved surface vertex in optical axis direction, and c represents the curvature on curved surface vertex, and K is represented
Quadratic surface coefficient, h represent optical axis to the distance of curved surface, and B, C, D, E and F represent quadravalence, six ranks, eight ranks, ten ranks and ten respectively
Surface of second order coefficient.
Embodiment 1：
The structure chart of the projection lens system of the present embodiment see Fig. 1, while refer to Fig. 2 a, 2b and Fig. 3, the throwing
The relevant parameter of each eyeglass is as shown in table 1-1 in shadow lens system.
Table 1-1
The aspherical parameter of each lens of the present embodiment is as shown in table 1-2.
Table 1-2
Embodiment 2
Fig. 4, Fig. 5 a, 5b and Fig. 6 are referred to, is the projection lens system provided in utility model second embodiment, it is described
The relevant parameter of each eyeglass is as shown in table 2-1 in projection lens system.
Table 2-1
The aspherical parameter of each lens of the present embodiment is as shown in table 2-2.
Table 2-3
Embodiment 3
Fig. 7, Fig. 8 a, 8b and Fig. 9 are referred to, is the projection lens system provided in utility model 3rd embodiment, it is described
The relevant parameter of each eyeglass is as shown in table 3-1 in projection lens system.
Table 3-1
The aspherical parameter of each lens of the present embodiment is as shown in table 3-2.
Table 3-4
Embodiment 4
0, Figure 11 a, 11b and Figure 12 are please referred to Fig.1, is the projection lens system provided in utility model fourth embodiment,
The relevant parameter of each eyeglass is as shown in table 4-1 in the projection lens system.
Table 4-1
The aspherical parameter of each lens of the present embodiment is as shown in table 4-2.
Table 4-5
Embodiment 5
3, Figure 14 a, 14b and Figure 15 are please referred to Fig.1, is utility model the without the projection lens system provided in embodiment,
The relevant parameter of each eyeglass is as shown in Table 5-1 in the projection lens system.
Table 5-1
The aspherical parameter of each lens of the present embodiment is as shown in table 5-2.
Table 5-6
Embodiment 6
6, Figure 17 a, 17b and Figure 18 are please referred to Fig.1, is the projection lens system provided in utility model sixth embodiment,
The relevant parameter of each eyeglass is as shown in Table 6-1 in the projection lens system.
Table 6-1
The aspherical parameter of each lens of the present embodiment is as shown in table 6-2.
Table 6-7
Since the data area of picture point is smaller, represent that lens performance is better, can be drawn from the attached drawing in each embodiment,
Picture point RMS radius in each embodiment are at 40 DEG C, and scope illustrates each implementation within 80um when 300mm image distances are imaged
Aberration in example is corrected well.
Table 7 is the comparison of above-mentioned 6 embodiments and its corresponding optical characteristics, including system focal length f, numerical aperture NA and
System overall length TTL, and numerical value corresponding with above each conditional.
Table 7
Embodiment described above only expresses the several embodiments of the utility model, its description is more specific and detailed,
But it should not be interpreted as limiting the scope of the present invention.It should be pointed out that for the common of this area
For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to
In the scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (10)
1. a kind of projection lens system, it is characterised in that include successively from the object side to image side along optical axis：
The first lens with positive light coke, its thing side surface are convex surface；
The second lens with negative power；
The 3rd lens with positive light coke, its image side surface are convex surface；
Diaphragm；
The optical centre of each lens is located along the same line；
The projection lens system meets the following conditions：
f12>f3；
(dn/dt)1<-50×10-6/℃；
(dn/dt)2<-50×10-6/℃；
(dn/dt)3>-10×10-6/℃；
Wherein, f12 represents the combined focal length of first lens and second lens, and f3 represents Jiao of the 3rd lens
Away from (dn/dt) 1, (dn/dt) 2, (dn/dt) 3 represent first lens, second lens, the 3rd lens respectively
Refractive index variation with temperature rate.
2. projection lens system according to claim 1, it is characterised in that the projection lens system meets conditional：
0 ＜ f3/f1 ＜ 3.5；
Wherein, f3 represents the focal length of the 3rd lens, and f1 represents the focal length of first lens.
3. projection lens system according to claim 1, it is characterised in that the projection lens system meets conditional：
- 5 ＜ f/r6 ＜ 0；
Wherein, f represents the system focal length of the projection lens system, and r6 represents the curvature half on the 3rd lens image side surface
Footpath.
4. projection lens system according to claim 1, it is characterised in that the projection lens system meets conditional：
- 5.5 ＜ r1/r6 ＜ 0；
Wherein, r1 represents the radius of curvature of the first lens thing side surface, and r6 represents the song on the 3rd lens image side surface
Rate radius.
5. projection lens system according to claim 1, it is characterised in that the projection lens system meets conditional：
0.5 ＜ CT3/CT2 ＜ 7.5；
Wherein, CT2 represents the center thickness of second lens, and CT3 represents the center thickness of the 3rd lens.
6. according to the projection lens system described in claim 1 to 5 any one, it is characterised in that first lens, described
Each thing side surface and image side surface of second lens and the 3rd lens are aspherical.
7. according to the projection lens system described in claim 1 to 5 any one, it is characterised in that first lens and institute
It is plastic cement material to state the second lens, and the 3rd lens are glass material.
8. projection lens system according to claim 1, it is characterised in that first lens, second lens and
There is airspace between any two adjacent lens in 3rd lens.
9. projection lens system according to claim 1, it is characterised in that first lens, second lens and
3rd lens are unbonded separate lenses.
10. projection lens system according to claim 6, it is characterised in that each lens in the projection lens system
Aspherical surface shape is satisfied by following equations：
Wherein, z represents that curved surface leaves distance of the curved surface vertex in optical axis direction, and c represents the curvature on curved surface vertex, and K represents secondary
Surface coefficients, h represent optical axis to the distance of curved surface, and B, C, D, E and F represent quadravalence, six ranks, eight ranks, ten ranks and ten second orders respectively
Surface coefficients.
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|---|---|---|---|
| CN201721188628.4U CN207301461U (en) | 2017-09-15 | 2017-09-15 | Projection lens system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721188628.4U CN207301461U (en) | 2017-09-15 | 2017-09-15 | Projection lens system |
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| CN207301461U true CN207301461U (en) | 2018-05-01 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107505689A (en) * | 2017-09-15 | 2017-12-22 | 江西联创电子有限公司 | Projection lens system |
| CN110579934A (en) * | 2019-09-11 | 2019-12-17 | 深圳市瞐客科技有限公司 | Novel miniature optical projection system |
| TWI680322B (en) * | 2018-11-27 | 2019-12-21 | 大立光電股份有限公司 | Lens system, projection apparatus, detecting module and electronic device |
| CN113589475A (en) * | 2021-07-02 | 2021-11-02 | 支付宝(杭州)信息技术有限公司 | Projection lens suitable for 3D face recognition |
-
2017
- 2017-09-15 CN CN201721188628.4U patent/CN207301461U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107505689A (en) * | 2017-09-15 | 2017-12-22 | 江西联创电子有限公司 | Projection lens system |
| TWI680322B (en) * | 2018-11-27 | 2019-12-21 | 大立光電股份有限公司 | Lens system, projection apparatus, detecting module and electronic device |
| CN110579934A (en) * | 2019-09-11 | 2019-12-17 | 深圳市瞐客科技有限公司 | Novel miniature optical projection system |
| CN113589475A (en) * | 2021-07-02 | 2021-11-02 | 支付宝(杭州)信息技术有限公司 | Projection lens suitable for 3D face recognition |
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