CN115903186A - optical lens - Google Patents
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- CN115903186A CN115903186A CN202211682191.5A CN202211682191A CN115903186A CN 115903186 A CN115903186 A CN 115903186A CN 202211682191 A CN202211682191 A CN 202211682191A CN 115903186 A CN115903186 A CN 115903186A
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Abstract
本发明公开了一种光学镜头，该光学镜头沿光轴从物面到成像面依次包括：不具有光焦度的平板玻璃，具有负光焦度的第一透镜，其物侧面在近光轴处为凹面，像侧面为凹面；光阑；具有正光焦度的第二透镜，其物侧面为凸面，像侧面为凸面；具有负光焦度的第三透镜，其物侧面为凹面，像侧面为凸面；不具有光焦度的平板玻璃。本发明的光学镜头采用两片塑胶非球面镜片和一片玻璃非球面镜片，该光学镜头可以在汽车等相对更严苛的环境中工作，同时具有超大视场角、小体积、小畸变的优点。
The invention discloses an optical lens, which sequentially comprises from the object plane to the imaging plane along the optical axis: flat glass without optical power, a first lens with negative optical power, the object side of which is on the near optical axis The center is concave, and the image side is concave; the stop; the second lens with positive power, its object side is convex, and the image side is convex; the third lens with negative power, its object side is concave, and the image side is concave Convex; flat glass with no optical power. The optical lens of the present invention adopts two plastic aspheric lenses and one glass aspheric lens, the optical lens can work in relatively harsh environments such as automobiles, and has the advantages of super large viewing angle, small volume and small distortion.
Description
Technical Field
The invention relates to the technical field of imaging lenses, in particular to an optical lens.
Background
Currently, the fingerprint identification function is widely applied to various electronic devices, such as mobile phones, computers, and the like, and the fingerprint identification has become an important configuration therein. The optical underscreen fingerprint identification technology is a fingerprint identification mode with the widest application range at present, and has the advantages of high development speed, good anti-interference performance and stability, and reasonable cost control. However, although the optical lens applied to the off-screen fingerprint recognition in the electronic device is small in size and accurate in recognition, it is difficult to stably and accurately operate in a relatively severe environment such as an automobile.
Disclosure of Invention
Based on this, the present invention provides an optical lens, which can operate in a relatively more severe environment such as an automobile, and has at least the advantages of an ultra-large field angle, a small volume, a small distortion, etc.
The invention provides an optical lens, which sequentially comprises the following components from an object side to an imaging surface along an optical axis: a plate glass; a first lens element having a negative optical power, the object-side surface of which is concave at the paraxial region and the image-side surface of which is concave; a diaphragm; a second lens with positive focal power, wherein the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface; a third lens with negative focal power, wherein the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; an optical filter; wherein, the optical lens satisfies the following conditional expression: 3-woven CT1/CT12<4;0.55 yarn(s) of CT3/CT2<0.75; wherein CT1 denotes a center thickness of the first lens, CT12 denotes an air space on an optical axis between the first lens and the second lens, CT3 denotes a center thickness of the third lens, and CT2 denotes a center thickness of the second lens.
Compared with the prior art, the optical lens provided by the invention has the characteristics of super-large field angle, small volume and small distortion by reasonably distributing the thicknesses and focal powers of the three lenses and reasonably controlling the surface types of the lenses, so that the optical lens better meets the use requirements in relatively severe environments.
Drawings
Fig. 1 is a schematic structural diagram of an optical lens provided in a first embodiment of the present invention;
FIG. 2 is a field curvature diagram of an optical lens according to a first embodiment of the present invention;
FIG. 3 is a graph showing optical distortion of an optical lens according to a first embodiment of the present invention;
FIG. 4 is a graph illustrating relative illumination of an optical lens according to a first embodiment of the present invention;
fig. 5 is a schematic structural diagram of an optical lens according to a second embodiment of the present invention;
FIG. 6 is a field curvature graph of an optical lens according to a second embodiment of the present invention;
FIG. 7 is a graph showing optical distortion of an optical lens according to a second embodiment of the present invention;
FIG. 8 is a graph illustrating relative illumination of an optical lens according to a second embodiment of the present invention;
fig. 9 is a schematic structural diagram of an optical lens system according to a third embodiment of the present invention;
FIG. 10 is a field curvature graph of an optical lens according to a third embodiment of the present invention;
fig. 11 is a graph showing an optical distortion of an optical lens in a third embodiment of the present invention;
FIG. 12 is a graph illustrating relative illuminance of an optical lens according to a third embodiment of the present invention;
fig. 13 is a schematic structural diagram of an optical lens according to a fourth embodiment of the present invention;
FIG. 14 is a field curvature graph of an optical lens according to a fourth embodiment of the present invention;
FIG. 15 is a graph showing an optical distortion of an optical lens system according to a fourth embodiment of the present invention;
fig. 16 is a graph showing relative illuminance of an optical lens according to a fourth embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Like reference numerals refer to like elements throughout the specification.
The present invention provides an optical lens, sequentially including, from an object side to an image plane along an optical axis: the lens comprises plate glass, a first lens, a diaphragm, a second lens, a third lens and an optical filter.
Wherein the first lens element has a negative focal power, the object-side surface of the first lens element is concave at the paraxial region, and the image-side surface of the first lens element is concave; the second lens has positive focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface; the third lens has negative focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; meanwhile, the first lens, the second lens and the third lens are all aspheric lenses.
In some embodiments, the optical lens satisfies the following conditional expression:
3<CT1/CT12<4；(1)
0.55<CT3/CT2<0.75；(2)
wherein CT1 denotes a center thickness of the first lens, CT12 denotes an air space on an optical axis between the first lens and the second lens, CT3 denotes a center thickness of the third lens, and CT2 denotes a center thickness of the second lens. The three aspheric lens combinations are adopted, and the values of CT1/CT12 and CT3/CT2 are reasonably distributed by matching the specific surface shapes and reasonably distributing focal power while meeting the conditional expressions (1) and (2), so that the optical lens has the characteristics of ultra-large field angle (FOV is more than 130 degrees), small volume (TTL is less than 2.65 mm) and small distortion (optical distortion is within 1.5%).
In some embodiments, the optical lens satisfies the following conditional expression:
-2.0<R11/R12<-1.2；(3)
0.2<CT1/TTL<0.3；(4)
wherein, R11 represents a curvature radius of an object-side surface of the first lens element, R12 represents a curvature radius of an image-side surface of the first lens element, CT1 represents a center thickness of the first lens element, and TTL represents a distance on an optical axis from the object-side surface of the first lens element to an image plane. Meanwhile, the conditional expressions (3) and (4) are met, the curvature radius and the thickness of the first lens are reasonably distributed, so that the incident angle of light rays entering the diaphragm is favorably reduced, the field angle and the object height of the optical lens are increased, and the identification range is favorably enlarged.
In some embodiments, the optical lens satisfies the following conditional expression:
-8<R21/R22<-4；(5)
-2.5<SAG22/SAG12<-1.5；(6)
wherein R21 represents the radius of curvature of the second lens object side, R22 represents the radius of curvature of the second lens image side, SAG22 represents the sagittal height of the second lens image side, and SAG12 represents the sagittal height of the first lens image side. Meanwhile, the conditional expressions (5) and (6) are met, and the surface shape of the second lens is reasonably distributed, so that light rays can be converged, the total length of the optical lens is reduced, and the miniaturization of the optical lens is realized.
In some embodiments, the optical lens satisfies the following conditional expression:
0.4<R31/R32<0.6；(7)
0.6<SAG31/SAG32<0.8；(8)
wherein R31 represents a radius of curvature of the third lens object side, R32 represents a radius of curvature of the third lens image side, SAG31 represents a sagittal height of the third lens object side, and SAG32 represents a sagittal height of the third lens image side. And meanwhile, the conditional expressions (7) and (8) are met, and the surface shape of the third lens is reasonably distributed, so that the spherical aberration and the coma aberration of each view field can be respectively corrected, and the resolution of the optical lens can be improved.
In some embodiments, the optical lens satisfies the following conditional expression:
2<φ32/CT3<4；(9)
where φ 32 represents the optical power of the image-side surface of the third lens, and CT3 represents the center thickness of the third lens. The condition formula (9) is satisfied, and the relation between the focal power of the image side surface of the third lens and the central thickness of the third lens is reasonably distributed, so that the compression molding of the third lens is facilitated, the processing tolerance of the third lens is reduced, and the yield of products is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
0.12<(CT12+CT23)/(CT1+CT2+CT3)<0.16；(10)
wherein CT12 denotes an air space on an optical axis between the first lens and the second lens, CT23 denotes an air space on an optical axis between the second lens and the third lens, CT1 denotes a center thickness of the first lens, CT2 denotes a center thickness of the second lens, and CT3 denotes a center thickness of the third lens. Satisfying the above conditional expression (10), by reasonably distributing the relationship between the air space of each lens on the optical axis and the center thickness of each lens, the distribution of each lens is more compact, the total length of the optical lens is reduced, and the miniaturization of the optical lens is realized.
In some embodiments, the optical lens satisfies the following conditional expression:
-15<(SAG22+SAG31)/CT23<-6；(11)
wherein SAG22 represents the saggital height of the second lens image side surface, SAG31 represents the saggital height of the third lens object side surface, and CT23 represents the air space on the optical axis between the second lens and the third lens. Satisfying above-mentioned conditional expression (11), through the relation of rational distribution second lens with third lens edge air gap and air interval on the optical axis, be favorable to correcting the distortion of peripheral visual field.
In some embodiments, the optical lens satisfies the following conditional expression:
-0.25<(R31-R32)/(R11-R12)<-0.07；(12)
wherein R31 denotes a radius of curvature of the object-side surface of the third lens, R32 denotes a radius of curvature of the image-side surface of the third lens, R11 denotes a radius of curvature of the object-side surface of the first lens, and R12 denotes a radius of curvature of the image-side surface of the first lens. The condition formula (12) is satisfied, and the relationship between the curvature radius of the third lens and the curvature radius of the first lens is reasonably distributed, so that the focal length of the optical lens is increased, and the image height of the optical lens is increased.
In some embodiments, the optical lens satisfies the following conditional expression:
0.28<FFL/TTL<0.35；(13)
wherein, FFL represents the distance between the image side surface of the third lens and the imaging surface on the optical axis, and TTL represents the distance between the object side surface of the first lens and the imaging surface on the optical axis. The optical lens meets the condition formula (13), and the proportion of the optical back focus in the total optical length is reasonably controlled, so that the risk of interference between a mechanism and the lens is favorably reduced, and the mechanism design of a product is favorably realized.
In some embodiments, the third lens is a glass aspheric lens. The third lens is made of glass materials, so that the influence of different temperatures on the performance of the optical lens can be reduced, and the third lens can be used in a relatively severe environment.
In some embodiments, the optical lens satisfies the following conditional expression:
0.9<Nd3/Nd2<1.0；(14)
where Nd3 denotes a refractive index of the third lens, and Nd2 denotes a refractive index of the second lens. The conditional expression (14) is met, and the glass material with smaller refractive index can be selected by reasonably controlling the relation of the refractive indexes of the second lens and the third lens, so that the production cost of the optical lens is reduced.
In each embodiment of the present invention, when the lens is an aspherical lens, the surface shape of the aspherical lens satisfies the following equation:
wherein z is the distance rise from the aspheric surface vertex at the position of height h along the optical axis direction, c is the paraxial curvature of the surface, and k is conic coefficient, A 2i Is the aspheric surface type coefficient of 2i order.
The invention is further illustrated below in the following examples. In various embodiments, the thickness, the curvature radius, and the material selection of each lens in the optical lens are different, and the specific differences can be referred to in the parameter tables of the various embodiments. The following examples are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the following examples, and any other changes, substitutions, combinations or simplifications which do not depart from the gist of the present invention should be construed as being equivalent replacements within the scope of the present invention.
First embodiment
Referring to fig. 1, which is a schematic structural diagram of an optical lens 100 according to a first embodiment of the present invention, the optical lens 100 sequentially includes, from an object side to an image plane S11 along an optical axis: the lens comprises a flat glass G1, a first lens L1, a diaphragm ST, a second lens L2, a third lens L3 and a filter G2.
Specifically, the object side surface of the plate glass G1 is S1, and the image side surface is S2; the first lens element L1 has a negative optical power, the object-side surface S3 of the first lens element is concave at the paraxial region, and the image-side surface S4 of the first lens element is concave; the second lens L2 has positive focal power, the object side surface S5 of the second lens is a convex surface, and the image side surface S6 of the second lens is a convex surface; the third lens L3 has negative focal power, the object-side surface S7 of the third lens is a concave surface, and the image-side surface S8 of the third lens is a convex surface; the object-side surface of the filter G2 is S9, and the image-side surface is S10. The first lens element L1 and the second lens element L2 are plastic aspheric lens elements, and the third lens element L3 is a molded aspheric lens element.
The parameters associated with each lens of the optical lens 100 provided by the first embodiment of the present invention are shown in table 1.
TABLE 1
The surface shape coefficients of the aspherical surfaces of the optical lens 100 in the present embodiment are shown in table 2.
TABLE 2
In the present embodiment, the structural diagram, the curvature of field, the optical distortion and the graphs of the relative illuminance of the optical lens 100 are respectively shown in fig. 1, fig. 2, fig. 3 and fig. 4.
Fig. 2 shows a curvature of field curve of the optical lens 100 in this embodiment, which represents curvature of field values at different fields of view, and it can be seen from the figure that the curvature of field values at each field of view are controlled within ± 0.1mm, which indicates that the curvature of field of each field of view of the optical lens 100 is well corrected.
Fig. 3 shows an optical distortion curve of the optical lens 100 of the present embodiment, which represents distortion at different fields of view on the imaging plane, and it can be seen from the figure that the optical distortion is controlled within ± 1.5%, which indicates that the distortion of the optical lens 100 is well corrected.
Fig. 4 shows a relative illuminance curve of the optical lens 100 in this embodiment, which represents a ratio of the illuminance of different fields to the central field, and it can be seen from the graph that the relative illuminance of the maximum field is controlled to be more than 35%, which indicates that the relative illuminance of each field of the optical lens 100 is good.
Second embodiment
Referring to fig. 5, a schematic structural diagram of an optical lens 200 according to a second embodiment of the present invention is shown, where the optical lens 200 in this embodiment is substantially the same as the first embodiment, and the differences are shown in tables 3 and 4.
The parameters associated with each lens of the optical lens 200 according to the second embodiment of the present invention are shown in table 3.
TABLE 3
The surface shape coefficients of the respective aspherical surfaces of the optical lens 200 in the present embodiment are shown in table 4.
TABLE 4
In the present embodiment, the structural diagram, the curvature of field, the optical distortion and the graphs of the relative illuminance of the optical lens 200 are respectively shown in fig. 5, 6, 7 and 8. As can be seen from the figure, the curvature of field is controlled within ± 0.2mm, which indicates that the curvature of field of the optical lens 200 is well corrected; the optical distortion is controlled within +/-1.5%, which shows that the distortion of the optical lens 200 is well corrected; the relative illuminance of the maximum field of view is controlled to be 35% or more, which indicates that the relative illuminance of each field of view of the optical lens 200 is good.
Third embodiment
Referring to fig. 9, a schematic structural diagram of an optical lens 300 according to a second embodiment of the present invention is shown, where the optical lens 300 in this embodiment is substantially the same as the optical lens 300 in the first embodiment, and different points are shown in tables 5 and 6.
The third embodiment of the present invention provides an optical lens 300, in which the relevant parameters of each lens are shown in table 5.
TABLE 5
The surface shape coefficients of the aspherical surfaces of the optical lens 300 in the present embodiment are shown in table 6.
TABLE 6
In the present embodiment, the structural diagram, curvature of field, optical distortion and graphs of relative illuminance of the optical lens 300 are shown in fig. 9, 10, 11 and 12, respectively. As can be seen from the figure, the curvature of field is controlled within ± 0.1mm, which indicates that the curvature of field of the optical lens 300 is well corrected; the optical distortion is controlled within +/-1.5%, which shows that the distortion of the optical lens 300 is well corrected; the relative illuminance of the maximum field of view is controlled to be 30% or more, which indicates that the relative illuminance of each field of view of the optical lens 300 is good.
Fourth embodiment
Referring to fig. 13, a schematic structural diagram of an optical lens 400 according to a second embodiment of the present invention is shown, where the optical lens 400 in this embodiment is substantially the same as the optical lens 400 in the first embodiment, and different points are detailed in tables 7 and 8.
The third embodiment of the present invention provides an optical lens 400, in which the relevant parameters of each lens are shown in table 7.
TABLE 7
The surface shape coefficients of the aspherical surfaces of the optical lens 400 in the present embodiment are shown in table 8.
TABLE 8
In the present embodiment, the structural diagram, curvature of field, optical distortion, and relative illuminance of the optical lens 400 are shown in fig. 13, 14, 15, and 16, respectively. As can be seen from the figure, the curvature of field is controlled within ± 0.1mm, which indicates that the curvature of field of the optical lens 400 is well corrected; the optical distortion is controlled within +/-1.5%, which shows that the distortion of the optical lens 400 is well corrected; the relative illuminance of the maximum field of view is controlled to be 30% or more, which indicates that the relative illuminance of each field of view of the optical lens 400 is good.
Table 9 shows the optical characteristics corresponding to the above four embodiments, which mainly include the effective focal length F, F #, total optical length TTL, object height OH, image height IH corresponding to the maximum field angle FOV and object height OH of the system, and the values corresponding to each of the above conditional expressions.
TABLE 9
In conclusion, the optical lens provided by the invention adopts three aspheric lenses with specific focal power, and through specific surface shape collocation and reasonable focal power distribution, the FOV of the optical lens reaches more than 130 degrees, the object height reaches 9.62mm, and the fingerprint identification range is wide; meanwhile, the three lenses are arranged compactly, and the total length of the optical lens is reduced, so that the optical lens has the advantages of super-large field angle, small volume and small distortion.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily 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.
The above examples are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. An optical lens, comprising, in order from an object side to an image plane along an optical axis: the device comprises plate glass, a first lens, a diaphragm, a second lens, a third lens and an optical filter;
the first lens has a negative optical power, the object side surface of the first lens is concave at a paraxial region, and the image side surface of the first lens is concave;
the second lens has positive focal power, the object-side surface of the second lens is a convex surface, and the image-side surface of the second lens is a convex surface;
the third lens has negative focal power, the object-side surface of the third lens is a concave surface, and the image-side surface of the third lens is a convex surface;
the optical lens satisfies the following conditional expression:
3<CT1/CT12<4；
0.55<CT3/CT2<0.75；
wherein CT1 denotes a center thickness of the first lens, CT12 denotes an air space on an optical axis between the first lens and the second lens, CT3 denotes a center thickness of the third lens, and CT2 denotes a center thickness of the second lens.
2. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
-2.0<R11/R12<-1.2；
0.2<CT1/TTL<0.3；
wherein, R11 represents a curvature radius of an object-side surface of the first lens element, R12 represents a curvature radius of an image-side surface of the first lens element, CT1 represents a center thickness of the first lens element, and TTL represents a distance on an optical axis from the object-side surface of the first lens element to an image plane.
3. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
-8<R21/R22<-4；
-2.5<SAG22/SAG12<-1.5；
wherein R21 represents the radius of curvature of the second lens object side, R22 represents the radius of curvature of the second lens image side, SAG22 represents the sagittal height of the second lens image side, and SAG12 represents the sagittal height of the first lens image side.
4. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.4<R31/R32<0.6；
0.6<SAG31/SAG32<0.8；
wherein R31 represents a radius of curvature of the third lens object side, R32 represents a radius of curvature of the third lens image side, SAG31 represents a sagittal height of the third lens object side, and SAG32 represents a sagittal height of the third lens image side.
5. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
2<φ32/CT3<4；
where φ 32 represents the optical power of the image-side surface of the third lens, and CT3 represents the center thickness of the third lens.
6. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.12<(CT12+CT23)/(CT1+CT2+CT3)<0.16；
wherein CT12 denotes an air space on an optical axis between the first lens and the second lens, CT23 denotes an air space on an optical axis between the second lens and the third lens, CT1 denotes a center thickness of the first lens, CT2 denotes a center thickness of the second lens, and CT3 denotes a center thickness of the third lens.
7. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
-15<(SAG22+SAG31)/CT23<-6；
wherein SAG22 represents the saggital height of the second lens image side surface, SAG31 represents the saggital height of the third lens object side surface, and CT23 represents the air space on the optical axis between the second lens and the third lens.
8. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
-0.25<(R31-R32)/(R11-R12)<-0.07；
wherein R31 denotes a radius of curvature of the object-side surface of the third lens, R32 denotes a radius of curvature of the image-side surface of the third lens, R11 denotes a radius of curvature of the object-side surface of the first lens, and R12 denotes a radius of curvature of the image-side surface of the first lens.
9. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.28<FFL/TTL<0.35；
wherein, FFL represents the distance between the image side surface of the third lens and the imaging surface on the optical axis, and TTL represents the distance between the object side surface of the first lens and the imaging surface on the optical axis.
10. An optical lens according to claim 1, characterized in that the third lens is a glass aspherical lens.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998052076A1 (en) * | 1997-05-15 | 1998-11-19 | Peck William G | Wide angle large aperture imaging lens |
| JP2000171731A (en) * | 1998-09-30 | 2000-06-23 | Asahi Optical Co Ltd | Eyepiece optical system of single-lens reflex camera |
| CN203299445U (en) * | 2013-04-15 | 2013-11-20 | 先进光电科技股份有限公司 | Thin wide-angle three-piece imaging lens group |
| TW201443472A (en) * | 2013-05-03 | 2014-11-16 | Sintai Optical Shenzhen Co Ltd | Micro lens |
| US20220326487A1 (en) * | 2021-04-13 | 2022-10-13 | Zhejiang Sunny Optics Co., Ltd | Optical imaging lens assembly |
-
2022
- 2022-12-27 CN CN202211682191.5A patent/CN115903186B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998052076A1 (en) * | 1997-05-15 | 1998-11-19 | Peck William G | Wide angle large aperture imaging lens |
| JP2000171731A (en) * | 1998-09-30 | 2000-06-23 | Asahi Optical Co Ltd | Eyepiece optical system of single-lens reflex camera |
| CN203299445U (en) * | 2013-04-15 | 2013-11-20 | 先进光电科技股份有限公司 | Thin wide-angle three-piece imaging lens group |
| TW201443472A (en) * | 2013-05-03 | 2014-11-16 | Sintai Optical Shenzhen Co Ltd | Micro lens |
| US20220326487A1 (en) * | 2021-04-13 | 2022-10-13 | Zhejiang Sunny Optics Co., Ltd | Optical imaging lens assembly |
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