CN214427610U - Lens system, projection module and depth camera - Google Patents
Lens system, projection module and depth camera Download PDFInfo
- Publication number
- CN214427610U CN214427610U CN202023343826.8U CN202023343826U CN214427610U CN 214427610 U CN214427610 U CN 214427610U CN 202023343826 U CN202023343826 U CN 202023343826U CN 214427610 U CN214427610 U CN 214427610U
- Authority
- CN
- China
- Prior art keywords
- lens
- optical axis
- image
- light
- light source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Lenses (AREA)
Abstract
The utility model discloses a lens system, projection module and degree of depth camera, include: the first lens, the second lens and the third lens are sequentially arranged along the emergent direction of the light; the object side surface of the first lens is a convex surface at the optical axis, and the image side surface of the first lens is a concave surface at the optical axis; the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface at the optical axis; the object side surface of the third lens is a concave surface at the optical axis, and the image side surface of the third lens is a convex surface at the optical axis; the distance between the first lens and the second lens is larger than the distance between the second lens and the third lens, and the vertical distance between the lens surface of the first lens and the optical axis is larger than the vertical distance between the lens surface of the second lens and the optical axis. The utility model discloses a special design to lens system for the projection module need not DOE optical device, thereby can improve the utilization ratio of speckle energy, reduces speckle distortion, has improved the imaging quality of degree of depth camera.
Description
Technical Field
The utility model relates to an optics and electron technical field, concretely relates to lens system, projection module and degree of depth camera.
Background
In recent years, with the rise of Face-brushing authentication such as new retail Face-brushing payment and cell phone Face unlocking (Face ID), consumer-grade 3D imaging electronic devices such as: structured light, TOF depth cameras have been greatly developed, with the optical lenses being increasingly widely used, not only in infrared receiving imaging systems, but also in collimation systems for active light source laser dot matrix projectors.
In the prior art, a conventional speckle optical projection system generally includes a VCSEL light source, a collimating lens and a diffractive optical element DOE, wherein light emitted by the VCSEL light source is collimated by the collimating lens, then is replicated and diffused by the diffractive optical element DOE, and is replicated and converted into a plurality of light beams to be diffused outwards and projected to a target area. Wherein, projection system's image speckle FOV coverage area is duplicated the extension and is obtained to central speckle block by DOE, because the influence of receiving transmittance and diffraction efficiency of device itself in DOE, energy loss is very serious to can produce great distortion phenomenon, thereby lead to the speckle of imaging module receiving end center intensive, and the speckle of corner is sparse, make the homogeneity of depth map poor, finally lead to the performance of complete machine product to receive the influence.
Therefore, how to improve the speckle energy utilization rate of the speckle optical projection system and reduce the influence of speckle distortion on the speckle density of the receiving end of the imaging module is a problem to be solved urgently.
The above background disclosure is only for the purpose of assisting understanding of the inventive concepts and technical solutions of the present invention, and does not necessarily belong to the prior art of the present patent application, and should not be used for evaluating the novelty and inventive step of the present application in the case that there is no clear evidence that the above contents are disclosed at the filing date of the present patent application.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at overcomes prior art not enough, provides a lens system, projection module and degree of depth camera to solve at least one kind among the above-mentioned background art problem.
The utility model discloses a reach above-mentioned purpose and propose following technical scheme:
a lens system comprises a first lens, a second lens and a third lens which are sequentially arranged along the emergent direction of light rays; the object side surface of the first lens is a convex surface at the optical axis, and the image side surface of the first lens is a concave surface at the optical axis; the object side surface of the second lens is a convex surface at the optical axis, and the image side surface of the second lens is a concave surface at the optical axis; the object side surface of the third lens is a concave surface at the optical axis, and the image side surface of the third lens is a convex surface at the optical axis; the distance between the first lens and the second lens is larger than the distance between the second lens and the third lens, and the vertical distance from the lens surface critical point of the first lens to the optical axis is larger than the vertical distance from the lens surface critical point of the second lens to the optical axis.
In some embodiments, the first lens, the second lens, and the third lens each have a positive optical power and satisfy:
-10<f3/f2<5；
0.3<f2/f1<12；
-0.9<f23/f1<-0.05；
-0.5<f12/f3<0.5；
1.52<Nd<1.95；
0.3<f/TL<0.9；
wherein f is the effective focal length of the lens system; f1 is the effective focal length of the first lens; f2 is the effective focal length of the second lens; f3 is the effective focal length of the third lens; f12 is the combined focal length of the first and second lenses; f23 is the combined focal length of the second lens and the third lens; nd is the refractive index of the lens material for D light; TL is the distance from the object-side surface to the image-side surface of the first lens L1 on the optical axis.
In some embodiments, the object-side surface and the image-side surface of the first lens, the second lens and the third lens are aspheric and satisfy:
0.15<r1/r2<1.5；
-2.5<r3/r4<-1.0；
0.15<r5/r6<1.5；
20<Vd<45；
wherein r1 is a radius of curvature of an object-side surface of the first lens, and r2 is a radius of curvature of an image-side surface of the first lens; r3 is the radius of curvature of the object-side surface of the second lens, r4 is the radius of curvature of the image-side surface of the second lens; r5 is the radius of curvature of the object-side surface of the third lens, r6 is the radius of curvature of the image-side surface of the third lens; vd is the abbe number of the lens material.
In some embodiments, a stop is further included, the stop being disposed between the second lens and the third lens.
In some embodiments, the first lens, the second lens, and the third lens are all plastic lenses.
The embodiment of the utility model provides another technical scheme does:
a projection module comprises a light source, an emission optical element and a driver; the light source is used for emitting light beams outwards under the control of the driver; the emission optical element is used for receiving the light beam emitted by the light source, shaping the light beam and projecting the shaped light beam to a target area, and comprises the lens system in any one of the embodiments.
In some embodiments, the light source is a VCSEL light source.
The embodiment of the utility model provides a technical scheme does yet:
a depth camera comprises the projection module, the imaging module, a processor and a bracket in the technical scheme of the embodiment; the projection module and the imaging module are installed and fixed on the support at a preset baseline distance.
In some embodiments, the light source is a VCSEL light source.
In some embodiments, the imaging module comprises an image sensor, a filtering unit and a receiving optical element; wherein the receiving optical element is configured to receive at least a portion of the speckle pattern reflected back by the target object and direct the at least a portion of the speckle pattern to the image sensor; the filtering unit is used for filtering background light or stray light
The utility model discloses technical scheme's beneficial effect is:
compared with the prior art, the utility model discloses lens system, projection module and degree of depth camera are through the special design to lens system for the projection module need not DOE optical device, thereby can improve the utilization ratio of speckle energy, reduces the speckle distortion, has improved the imaging quality of degree of depth camera.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic block diagram of a depth camera according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a lens system according to another embodiment of the present invention;
fig. 3 is a schematic diagram of an optical path structure of the lens system in the embodiment of fig. 2.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The utility model provides a lens system, projection module and degree of depth camera is for understanding, describes degree of depth camera, projection module earlier below, explains the lens system again further at last.
Referring to fig. 1, fig. 1 is a schematic diagram of a depth camera according to an embodiment of the present invention, and a depth camera 100 includes a projection module 10, an imaging module 20, and a processor 30; the projection module 10 and the imaging module 20 are arranged on the bracket at a preset baseline distance; wherein, the projection module 10 includes a light source 101 composed of one or more lasers for projecting the encoded speckle pattern into the target space, and reflecting the encoded speckle pattern back to the imaging module 20 through the target object 40 in the target space; the imaging module 20 includes an image sensor 201 for collecting photons in the reflected speckle pattern and outputting a photon signal; the processor 30 is connected to the projection module 10 and the imaging module 20, and is configured to synchronize the trigger signals of the projection module 10 and the imaging module 20 to calculate a flight time required for receiving the photons from the emitting direction to the reflecting direction, so as to obtain depth information of the target object.
Specifically, the projection module 10 includes a light source 101, an emission optical element 102, a driver 103, and the like. The light source 101 may be a Light Emitting Diode (LED), a Laser Diode (LD), an Edge Emitting Laser (EEL), a Vertical Cavity Surface Emitting Laser (VCSEL), or the like, or may be a one-dimensional or two-dimensional light source array composed of a plurality of light sources. The light beam projected by the light source 111 may be visible light, infrared light, ultraviolet light, or the like. The light source 101 projects a light beam outward under the control of the driver 103. In one embodiment, the light source is an infrared laser light source, such as a 940nm band, the speckle points may be arranged in a quadrilateral or hexagonal pattern, and correspondingly, the imaging module is an infrared camera of the corresponding band.
The emission optical element 102 receives the light beam emitted from the light source 101 and projects the light beam to a target region after shaping. In one embodiment, the transmit optical element 102 receives a pulsed light beam from the light source 101 and subjects the pulsed light beam to a coded modulation, such as a collimation, diffraction, refraction, reflection, etc., followed by projection of a coded speckle pattern, such as a focused light beam, a flood light beam, a structured light beam, etc., into space. Wherein the emitting optical element 102 comprises a lens system 200.
The imaging module 20 includes an image sensor 201, a filter unit 202, and a receiving optical element 203; wherein receiving optics 203 is configured to receive at least a portion of the speckle pattern reflected back from the target object and direct the at least a portion of the speckle pattern onto image sensor 201; the filtering unit 202 is used for filtering out background light or stray light.
The embodiment of fig. 1 is described by taking a TOF camera as an example, and it should be noted that the projection module 10 in the embodiment of the present invention can also be used in a depth camera of a structured light scheme, and when being applied to the structured light scheme, the depth camera is a structured light camera.
In some embodiments, in order to make the overall projection device smaller, a vertical cavity surface laser emitter array (VCSEL array) is preferable as the light source, and when the projection module 10 is used to project a speckle pattern into a space, the two-dimensional pattern of the VCSEL array light sources is an irregular pattern, and the arrangement is irregular to improve the irrelevance of the speckle pattern. In which each of the VCSEL array light sources has a certain divergence angle, and therefore a collimating or converging lens system is required.
Referring to fig. 2 and 3, a lens system 200 according to an embodiment of the present invention includes a first lens L1, a second lens L2, and a third lens L3 sequentially arranged along a light exit direction; the distance between the first lens L1 and the second lens L2 is greater than the distance between the second lens L2 and the third lens L3, the vertical distance HL1 from the lens surface critical point a of the first lens L1 to the optical axis is greater than the vertical distance HL2 from the lens surface critical point B of the second lens L2 to the optical axis, and the vertical distance from the lens surface critical point B of the second lens L2 to the optical axis is greater than the vertical distance HL3 from the lens surface critical point C of the third lens L3 to the optical axis; specifically, referring to FIG. 2, the lens system 200 has an object plane and an image plane, and in the embodiment of the present invention, the light source plane is defined as the object plane (i.e., the left-most side in FIG. 2 is the object plane), the projection plane is defined as the image plane (i.e., the right-most side in FIG. 2 is the image plane), the side of the lens facing the light source is the object side, and the side facing the projection plane is the image side; the object-side surface of the first lens element L1 is convex at the optical axis, and the image-side surface thereof is concave at the optical axis; the object-side surface of the second lens element L2 is convex, and the image-side surface thereof is concave at the optical axis; the object-side surface of the third lens element L3 is concave at the optical axis, and the image-side surface is convex at the optical axis; the first lens L1, the second lens L2, and the third lens L3 each have positive optical power.
In an embodiment of the present invention, the lens system 200 satisfies the following conditions:
0.15<r1/r2<1.5；
-2.5<r3/r4<-1.0；
0.15<r5/r6<1.5；
-10<f3/f2<5；
0.3<f2/f1<12；
-0.9<f23/f1<-0.05；
-0.5<f12/f3<0.5；
1.52<Nd<1.95；
0.3<f/TL<0.9；
20<Vd<45；
where f is the effective focal length of lens system 200; f1 is the effective focal length of the first lens L1; f2 is the effective focal length of the second lens L2; f3 is the effective focal length of the third lens L3; f12 is the combined focal length of the first lens L1 and the second lens L2; f23 is the combined focal length of the second lens L2 and the third lens L3; r1 is the radius of curvature of the object-side surface of the first lens L1, r2 is the radius of curvature of the image-side surface of the first lens L1; r3 is the radius of curvature of the object-side surface of the second lens L2, and r4 is the radius of curvature of the image-side surface of the second lens L2; r5 is the radius of curvature of the object-side surface of the third lens L3, and r6 is the radius of curvature of the image-side surface of the third lens L3; nd is the refractive index of the lens material to D light, wherein the D light can be written as D-line and is also called D line, and the wavelength is 587 nm; TL is the distance from the object-side surface to the image-side surface of the first lens L1 on the optical axis; vd is the abbe number of the lens material.
In some embodiments, the first lens L1, the second lens L2, and the third lens L3 are all plastic lenses, and both the object-side surface and the image-side surface of the lenses are aspheric.
In some embodiments, the lens system 200 further comprises a stop 204, wherein the stop 204 is disposed between the second lens L2 and the third lens L3.
For convenience of description, the object-side surface of the first lens L1 is denoted as S1, and the image-side surface of the first lens L1 is denoted as S2; the object-side surface of the second lens L2 is denoted as S3, and the image-side surface of the second lens L2 is denoted as S4; the object-side surface of the third lens L3 is denoted as S5, and the image-side surface of the third lens L3 is denoted as S6.
Table 1 below is an exemplary lens system surface coefficient:
TABLE 1 surface coefficients of lens systems
| Surface of | Component | Radius of curvature (R) | Thickness/distance (T) | Refractive index (Nd) | Abbe number (Vd) | Coefficient of cone (K) |
| S0 | VCSEL | Infinity | 0.650 | |||
| S1 | L1 | 0.814 | 0.799 | 1.64 | 23.5 | -7.78E-001 |
| S2 | 1.146 | 0.647 | -5.19E-001 | |||
| S3 | L2 | 0.524 | 0.655 | 1.64 | 23.5 | -6.63E-001 |
| S4 | 1.067 | 0.185 | 1.157E+000 | |||
| Stop | Diaphragm | Infinity | 0.131 | |||
| S6 | L3 | -0.567 | 0.434 | 1.64 | 23.5 | 7.92E-001 |
| S7 | -0.802 | 0 | 5.93E-001 | |||
| S7 | Infinity | - |
The aspherical surface curve equation of each lens is as follows:
wherein z is the optical axis direction; c represents a curvature of the lens surface near the optical axis and is an inverse of a curvature radius R (c ═ 1/R); r is the curvature radius of the lens surface close to the optical axis; h is the perpendicular distance of the lens surface from the optical axis, and k is the conic constant; and A2, A4, A6, A8, A10, A12, A14, A16 and … … are high-order aspheric coefficients.
Table 2 below is an exemplary lens system aspheric coefficient design:
TABLE 2 aspherical coefficients
| Surface of | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -3.89E-001 | 3.06E-001 | -1.44E-001 | 2.02E-002 | -1.55E-003 | 0 | 0 |
| S2 | -7.81E-001 | 6.86E-001 | -2.18E-001 | -1.95E-001 | 1.28E-001 | 0 | 0 |
| S3 | -6.20E-2 | 3.47E-001 | 7.36E-001 | 1.73E+000 | 1.60E+000 | 0 | 0 |
| S4 | 7.40E-001 | -2.59E+000 | 6.19E+001 | -5.92E+002 | 1.27E+003 | 0 | 0 |
| S5 | -4.48E-001 | 1.05E+001 | -2.54E+002 | 2.45E+003 | -1.31E+004 | 0 | 0 |
| S6 | -7.86E-003 | 5.74E-001 | -1.87E+000 | 2.17E+000 | -6.72E-001 | 0 | 0 |
In the above parameter design example, the maximum field angle FOV of the lens system 200 is 68.5 °, the focal length EFL is 1.27mm, the aperture FNO is 2.1, the total optical length TTL is 3.5mm, and the maximum half height is 1.7 mm, which is suitable for the 930-950 nm infrared laser band. Therefore, under the condition of ensuring a large field angle, uniform speckle projection with high signal-to-noise ratio is realized, the device has the characteristic of simple structure, stable collimated light spots can be obtained, and the imaging quality of the final complete machine product is ensured.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the present invention.
In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction. Although embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the scope of the invention as defined by the appended claims.
Claims (10)
1. A lens system, characterized by: the lens comprises a first lens, a second lens and a third lens which are sequentially arranged along the emergent direction of light rays; the object side surface of the first lens is a convex surface at the optical axis, and the image side surface of the first lens is a concave surface at the optical axis; the object side surface of the second lens is a convex surface at the optical axis, and the image side surface of the second lens is a concave surface at the optical axis; the object side surface of the third lens is a concave surface at the optical axis, and the image side surface of the third lens is a convex surface at the optical axis; the distance between the first lens and the second lens is larger than the distance between the second lens and the third lens, and the vertical distance from the lens surface critical point of the first lens to the optical axis is larger than the vertical distance from the lens surface critical point of the second lens to the optical axis.
2. The lens system of claim 1, wherein: the first lens, the second lens and the third lens all have positive focal power and satisfy that:
-10<f3/f2<5；
0.3<f2/f1<12；
-0.9<f23/f1<-0.05；
-0.5<f12/f3<0.5；
1.52<Nd<1.95；
0.3<f/TL<0.9；
wherein f is the effective focal length of the lens system; f1 is the effective focal length of the first lens; f2 is the effective focal length of the second lens; f3 is the effective focal length of the third lens; f12 is the combined focal length of the first and second lenses; f23 is the combined focal length of the second lens and the third lens; nd is the refractive index of the lens material for D light; TL is the distance from the object-side surface to the image-side surface of the first lens L1 on the optical axis.
3. The lens system of claim 1, wherein: the object side surface and the image side surface of the first lens, the second lens and the third lens are aspheric surfaces, and satisfy the following conditions:
0.15<r1/r2<1.5；
-2.5<r3/r4<-1.0；
0.15<r5/r6<1.5；
20<Vd<45；
wherein r1 is a radius of curvature of an object-side surface of the first lens, and r2 is a radius of curvature of an image-side surface of the first lens; r3 is the radius of curvature of the object-side surface of the second lens, r4 is the radius of curvature of the image-side surface of the second lens; r5 is the radius of curvature of the object-side surface of the third lens, r6 is the radius of curvature of the image-side surface of the third lens; vd is the abbe number of the lens material.
4. The lens system of claim 1, wherein: the diaphragm is arranged between the second lens and the third lens.
5. The lens system of any of claims 1-4, wherein: the first lens, the second lens and the third lens are all plastic lenses.
6. A projection module, its characterized in that: comprises a light source, an emitting optical element and a driver; the light source is used for emitting light beams outwards under the control of the driver; the emitting optical element is used for receiving the light beam emitted by the light source, shaping the light beam and projecting the shaped light beam to a target area, and comprises the lens system of any one of claims 1 to 4.
7. The projection module of claim 6 wherein: the light source is a VCSEL light source.
8. A depth camera, characterized by: comprising the projection module, the imaging module, the processor and the bracket of claim 6; the projection module and the imaging module are installed and fixed on the support at a preset baseline distance.
9. The depth camera of claim 8, wherein: the light source is a VCSEL light source.
10. The depth camera of claim 8, wherein: the imaging module comprises an image sensor, a filtering unit and a receiving optical element; wherein the receiving optical element is configured to receive at least a portion of the speckle pattern reflected back by the target object and direct the at least a portion of the speckle pattern to the image sensor; the filtering unit is used for filtering background light or stray light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023343826.8U CN214427610U (en) | 2020-12-31 | 2020-12-31 | Lens system, projection module and depth camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023343826.8U CN214427610U (en) | 2020-12-31 | 2020-12-31 | Lens system, projection module and depth camera |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214427610U true CN214427610U (en) | 2021-10-19 |
Family
ID=78054744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023343826.8U Active CN214427610U (en) | 2020-12-31 | 2020-12-31 | Lens system, projection module and depth camera |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214427610U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114839645A (en) * | 2022-05-13 | 2022-08-02 | 深圳市汇顶科技股份有限公司 | Time of flight TOF module and electronic equipment of making a video recording |
| CN114859529A (en) * | 2022-07-05 | 2022-08-05 | 江西联益光学有限公司 | Collimating lens |
-
2020
- 2020-12-31 CN CN202023343826.8U patent/CN214427610U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114839645A (en) * | 2022-05-13 | 2022-08-02 | 深圳市汇顶科技股份有限公司 | Time of flight TOF module and electronic equipment of making a video recording |
| CN114859529A (en) * | 2022-07-05 | 2022-08-05 | 江西联益光学有限公司 | Collimating lens |
| CN114859529B (en) * | 2022-07-05 | 2022-11-01 | 江西联益光学有限公司 | Collimating lens |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN214427610U (en) | Lens system, projection module and depth camera | |
| US11314062B2 (en) | Collimating lens, projecting module and mobile phone | |
| US10001583B2 (en) | Structured light projection using a compound patterned mask | |
| CN109031591B (en) | Projection lens | |
| CN213987007U (en) | Light projector with telecentric lens | |
| JP2016020935A (en) | Laser device | |
| CN111766754B (en) | Optical system and projection device | |
| CN214427670U (en) | Lens system, imaging module and depth camera | |
| CN214542912U (en) | Small-size semiconductor laser | |
| CN110320673B (en) | Optical module and method for projection | |
| US10831000B2 (en) | Optical lens assembly | |
| CN208110175U (en) | Lens system, structured light projection mould group and depth camera | |
| US9557526B2 (en) | Freeform imaging lens and freeform imaging system using the same | |
| CN207908819U (en) | Lens system, structured light projection module and depth camera | |
| CN214122555U (en) | Lens system, projection module and depth camera | |
| CN214623043U (en) | Lens system, imaging module and depth camera | |
| CN114839645A (en) | Time of flight TOF module and electronic equipment of making a video recording | |
| CN215218570U (en) | Lens system, imaging module and TOF depth camera | |
| CN215264246U (en) | Collimating lens system, projection module and depth camera | |
| CN215121040U (en) | High-performance lens system, imaging module and depth camera | |
| CN212341569U (en) | Lens system, structured light projection module and depth camera | |
| CN215526245U (en) | Lens system, projection module and depth camera | |
| CN215117017U (en) | Projection module, depth camera and electronic equipment | |
| CN217879797U (en) | Optical imaging lens, imaging module and depth camera | |
| CN218824931U (en) | Lens system, projection module and depth camera |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |