CN112612135B - Eyepiece optical system - Google Patents
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- CN112612135B CN112612135B CN202011609295.4A CN202011609295A CN112612135B CN 112612135 B CN112612135 B CN 112612135B CN 202011609295 A CN202011609295 A CN 202011609295A CN 112612135 B CN112612135 B CN 112612135B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 81
- 238000003384 imaging method Methods 0.000 claims abstract description 26
- 239000011521 glass Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 5
- 239000006185 dispersion Substances 0.000 claims description 4
- 210000001747 pupil Anatomy 0.000 abstract description 12
- 230000004075 alteration Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 8
- 230000014509 gene expression Effects 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012634 optical imaging Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B25/00—Eyepieces; Magnifying glasses
- G02B25/001—Eyepieces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B25/00—Eyepieces; Magnifying glasses
- G02B25/04—Eyepieces; Magnifying glasses affording a wide-angle view, e.g. through a spy-hole
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Abstract
The invention relates to the technical field of lenses. The invention discloses an eyepiece optical system, which sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a third lens from the eye side to the display side along an optical axis, wherein the first lens and the third lens are convex lenses with positive refractive index, the second lens is a concave-convex lens with positive refractive index, the fourth lens is a concave-concave lens with negative refractive index, and the eye side surfaces and the display side surfaces of the first lens and the second lens are aspheric surfaces; the third lens and the fourth lens are mutually glued, and the third lens and the fourth lens are glass lenses. The invention has the advantages of large angle of view, large exit pupil distance, high resolution, good imaging quality, small number of lenses, miniaturization and good yield of mass production.
Description
Technical Field
The invention belongs to the technical field of lenses, and particularly relates to an eyepiece optical system of a handheld camera.
Background
With the continuous progress of science and technology and the continuous development of society, in recent years, an optical imaging lens has also been rapidly developed, and the optical imaging lens is widely applied to various fields such as smart phones, tablet personal computers, video conferences, vehicle-mounted monitoring, unmanned aerial vehicle aerial photographing, machine vision, security monitoring, cameras and the like, so that the requirements on the optical imaging lens are also higher and higher.
However, eyepiece lenses used for handheld cameras in the market at present have many defects, such as small field angle and incapability of adapting to the situation of large field of view; the exit pupil distance is small and is usually smaller than 20mm, so that the lens is not suitable for people with glasses; the number of lenses is large, the volume is large, the productization performance is poor, and the like, so that the requirements of consumers on increasing are not met, and improvement is urgently needed.
Disclosure of Invention
The present invention is directed to an eyepiece optical system for solving the above-mentioned problems.
In order to achieve the above purpose, the invention adopts the following technical scheme: an eyepiece optical system is used for enabling imaging light to enter an eye of an observer from a display picture through the eyepiece optical system to form an image, wherein the direction facing the eye is a target side, the direction facing the display picture is a display side, and the eyepiece optical system sequentially comprises a first lens and a fourth lens along an optical axis from the target side to the display side; the first lens to the fourth lens respectively comprise a mesh side surface facing the mesh side and allowing imaging light rays to pass through and a display side surface facing the display side and allowing imaging light rays to pass through;
The first lens has positive refractive index, the eye side surface of the first lens is a convex surface, and the display side surface of the first lens is a convex surface;
the second lens has positive refractive index, the eye side surface of the second lens is a concave surface, and the display side surface of the second lens is a convex surface;
the third lens has positive refractive index, the side surface of the eye of the third lens is a convex surface, and the display side surface of the third lens is a convex surface;
The fourth lens has negative refractive index, the eye side surface of the fourth lens is a concave surface, and the display side surface of the fourth lens is a concave surface;
the eye side surface and the display side surface of the first lens and the second lens are aspheric; the third lens and the fourth lens are glued mutually, and the third lens and the fourth lens are glass lenses;
The eyepiece optical system has only the first to fourth lenses.
Further, the first lens and the second lens are both made of plastic materials.
Further, the eyepiece optical system further satisfies: nd4-nd3 is less than or equal to 0.07, wherein nd3 is the refractive index of the third lens, and nd4 is the refractive index of the fourth lens.
Further, the eyepiece optical system further satisfies: nd3 and nd4 are respectively 1.88 and 2.00.
Further, the eyepiece optical system further satisfies: vd3-vd4 is not less than 20, wherein vd3 is an Abbe number of the third lens and vd4 is an Abbe number of the fourth lens.
Further, the eyepiece optical system further satisfies: and nd1 is equal to or less than 1.54, wherein nd1 is the refractive index of the first lens.
Further, the eyepiece optical system further satisfies: and nd2 is 1.64.ltoreq.nd 2, wherein nd2 is the refractive index of the second lens.
Further, the eyepiece optical system further satisfies: TTL is less than or equal to 35.1mm, wherein TTL is the distance from the eye side surface of the first lens to the display picture on the optical axis.
The beneficial technical effects of the invention are as follows:
The invention adopts four lenses, and by carrying out corresponding design on each lens, the invention has large angle of view and horizontal angle of view of more than 44 degrees; the exit pupil distance is large and can reach 25mm; the imaging quality is good; the number of lenses is small, the size is small, and the product performance is achieved; the sensitivity of the lens is good, and the yield of mass production is good.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a first embodiment of the present invention;
FIG. 2 is a diagram of MTF of 0.4861-0.6563 μm according to one embodiment of the present invention;
FIG. 3 is a graph of field curvature and distortion for a first embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a second embodiment of the present invention;
FIG. 5 is a diagram of MTF of 0.4861-0.6563 μm in example two of the present invention;
FIG. 6 is a graph of field curvature and distortion in accordance with a second embodiment of the present invention;
FIG. 7 is a schematic diagram of a third embodiment of the present invention;
FIG. 8 is a diagram of MTF of 0.4861-0.6563 μm in example three of the present invention;
FIG. 9 is a graph of field curvature and distortion for a third embodiment of the present invention;
FIG. 10 is a schematic diagram of a fourth embodiment of the present invention;
FIG. 11 is a MTF diagram of 0.4861-0.6563 μm for example four of the present invention;
fig. 12 is a graph showing curvature of field and distortion in accordance with a fourth embodiment of the present invention.
Detailed Description
For further illustration of the various embodiments, the invention is provided with the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments and together with the description, serve to explain the principles of the embodiments. With reference to these matters, one of ordinary skill in the art will understand other possible embodiments and advantages of the present invention. The components in the figures are not drawn to scale and like reference numerals are generally used to designate like components.
The invention will now be further described with reference to the drawings and detailed description.
The term "a lens having a positive refractive index (or negative refractive index)" means that the paraxial refractive index of the lens calculated by Gaussian optics theory is positive (or negative). The surface roughness determination of the lens can be performed by a determination method by a person of ordinary skill in the art, that is, by a sign of a radius of curvature (abbreviated as R value). The R value may be commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in the lens data table (LENS DATA SHEET) of optical design software. When the R value is positive, the object side surface is judged to be convex; when the R value is negative, the judgment target side surface is concave. On the contrary, when the R value is positive, the display side surface is judged to be concave; when the R value is negative, it is determined that the display side is convex.
The invention discloses an eyepiece optical system, which is used for enabling imaging light to enter an observer's eye from a display picture through the eyepiece optical system, wherein the direction towards the eye is a target side, the direction towards the display picture is a display side, and the eyepiece optical system sequentially comprises a first lens and a fourth lens along an optical axis from the target side to the display side; the first lens to the fourth lens each include a mesh side surface facing the mesh side and passing the imaging light and a display side surface facing the display side and passing the imaging light.
The first lens has positive refractive index, the object side surface of the first lens is a convex surface, and the display side surface of the first lens is a convex surface.
The second lens has positive refractive index, the eye side surface of the second lens is concave, and the display side surface of the second lens is convex.
The third lens has positive refractive index, the side surface of the eye of the third lens is a convex surface, and the display side surface of the third lens is a convex surface.
The fourth lens has negative refractive index, the eye side surface of the fourth lens is a concave surface, and the display side surface of the fourth lens is a concave surface.
The eye side surface and the display side surface of the first lens and the second lens are aspheric; the third lens and the fourth lens are mutually glued, and the third lens and the fourth lens are glass lenses.
The first lens is used for reducing the primary quantity of aberration (particularly spherical aberration), reducing the advanced quantity of the first lens, correcting partial aberration, relieving the burden of a rear group, and using one aspheric lens to achieve the effect of using a plurality of spherical lenses, so that the structure is simpler, and the overall length of the system is easier to realize shorter; the second lens is used for reducing the primary quantity of aberration (particularly spherical aberration), and can also reduce the advanced quantity of the aberration, and the second lens and the first lens are used for correcting off-axis aberration of the system together, so that the effect of using a plurality of spherical lenses is achieved by using one aspheric lens, the structure is simpler, and the total length of the system is easier to realize shorter; the third lens further corrects the aberration, and effectively reduces the primary aberration; the fourth lens is used by being glued with the third lens, and chromatic aberration of the system is corrected.
The eyepiece optical system has only the first to fourth lenses. The invention adopts four lenses, and by carrying out corresponding design on each lens, the invention has large angle of view and horizontal angle of view of more than 44 degrees; the exit pupil distance is large and can reach 25mm; the imaging quality is good; the number of lenses is small, the size is small, and the product performance is achieved; the sensitivity of the lens is good, and the yield of mass production is good.
Preferably, the first lens and the second lens are made of plastic materials, so that the weight is further reduced, the cost is reduced, and the productization performance is improved.
Preferably, the eyepiece optical system further satisfies: nd4-nd3 is less than or equal to 0.07, wherein nd3 is the refractive index of the third lens, nd4 is the refractive index of the fourth lens, and the chromatic aberration of the system is further optimized.
More preferably, the eyepiece optical system further satisfies: nd3 is more than or equal to 1.88 and nd4 is more than or equal to 2.00, MTF and distortion are further optimized, and imaging quality is improved.
Preferably, the eyepiece optical system further satisfies: and vd3-vd4 is more than or equal to 20, wherein vd3 is the dispersion coefficient of the third lens, and vd4 is the dispersion coefficient of the fourth lens, so that the chromatic aberration of the system is further optimized.
Preferably, the eyepiece optical system further satisfies: and nd1 is less than or equal to 1.54, wherein nd1 is the refractive index of the first lens, MTF and distortion are further optimized, and imaging quality is improved.
Preferably, the eyepiece optical system further satisfies: and nd2 is not more than 1.64, wherein nd2 is the refractive index of the second lens, MTF and distortion are further optimized, and imaging quality is improved.
Preferably, the eyepiece optical system further satisfies: TTL is less than or equal to 35.1mm, wherein TTL is the distance from the eye side surface of the first lens to the display picture on the optical axis, and the total length of the system is further shortened, so that miniaturization is realized.
The eyepiece optical system of the present invention will be described in detail with specific embodiments, and the following embodiments all use a reverse design (ray direction reverse tracking) method to describe the performance of the eyepiece optical system of the present invention, that is, the human eye exit pupil is used as a diaphragm, the display screen is used as an imaging plane, and rays are focused and imaged from the human eye exit pupil through the eyepiece optical system to the display screen.
Example 1
As shown in fig. 1, an eyepiece optical system for imaging an imaging light ray from a display screen 6 through the eyepiece optical system and an eye exit pupil 5 of an observer, the direction toward the eye being a destination side A1, the direction toward the display screen 6 being a display side A2, the eyepiece optical system sequentially including the eye exit pupil 5 (as a stop), a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, and the display screen 6 (as an imaging plane) along an optical axis I from the destination side A1 to the display side A2; the first lens 1 to the fourth lens 4 each include a mesh side surface facing the mesh side A1 and passing imaging light and a display side surface facing the display side A2 and passing imaging light.
The first lens 1 has positive refractive power, the object side 11 of the first lens 1 is convex, and the display side 12 of the first lens 1 is convex.
The second lens 2 has positive refractive power, the eye side 21 of the second lens 2 is concave, and the display side 22 of the second lens 2 is convex.
The third lens element 3 has positive refractive power, the object-side surface 31 of the third lens element 3 is convex, and the display-side surface 32 of the third lens element 3 is convex.
The fourth lens element 4 has a negative refractive power, the object-side surface 41 of the fourth lens element 4 is concave, and the display-side surface 42 of the fourth lens element 4 is concave.
The eye side surfaces 11, 21 and the display side surfaces 12, 22 of the first lens 1 and the second lens 2 are aspherical.
The third lens 3 and the fourth lens 4 are glued with each other, and the third lens 3 and the fourth lens 4 are glass spherical lenses.
In the present embodiment, the first lens 1 and the second lens 2 are preferably made of plastic materials, but are not limited thereto, and in some embodiments, may be made of other optical materials such as glass.
The detailed optical data of this particular example are shown in Table 1-1.
Table 1-1 detailed optical data for example one
In this embodiment, the eye side surfaces 11, 21 and the display side surfaces 12, 22 are defined by the following aspherical curve equation:
Wherein:
r is the distance from a point on the optical surface to the optical axis.
Z is the sagittal height of the point along the optical axis.
C is the curvature of the surface.
K is the quadric constant of the surface.
A 4、A6、A8、A10、A12、A14 is respectively: fourth, sixth, eighth, tenth, fourteen order aspheric coefficients.
For detailed data of the parameters of each aspheric surface, please refer to the following table:
the values of the related conditional expressions of this embodiment are shown in table 5.
The MTF transfer function chart of this embodiment is shown in fig. 2, and it can be seen that the resolution is high, the central MTF value of 30lp/mm spatial frequency is greater than 0.8, the edge MTF value is greater than 0.3, and the image quality is good; referring to fig. 3 (a) and (B), it can be seen that the curvature of field and distortion are small and the imaging quality is good.
In this particular embodiment, the focal length f=19.53 mm of the eyepiece optical system; horizontal field angle fov=45.0°; the exit pupil distance is 25.0mm; the distance ttl=35.00 mm on the optical axis I from the eye side 11 of the first lens 1 to the display screen 6.
Example two
As shown in fig. 4, in this embodiment, the surface roughness and refractive index of each lens are the same as those of the first embodiment, and only the optical parameters such as the radius of curvature and the lens thickness of each lens surface are different.
The detailed optical data of this particular example are shown in Table 2-1.
Table 2-1 detailed optical data for example two
For detailed data of the parameters of each aspheric surface in this embodiment, please refer to the following table:
| Surface of the body | K | A4 | A6 | A8 | A10 | A12 |
| 11 | 20.849 | -1.25E-05 | 4.95E-08 | -4.06E-11 | -2.48E-13 | 0.00E+00 |
| 12 | -0.741 | 2.24E-05 | 1.58E-07 | -1.04E-10 | -4.52E-13 | 0.00E+00 |
| 21 | 4.462 | 8.54E-06 | 1.06E-07 | 1.68E-10 | -3.39E-13 | 1.68E-15 |
| 22 | -2.201 | -6.90E-06 | -5.90E-08 | 1.64E-10 | 1.21E-12 | -1.36E-15 |
The values of the related conditional expressions of this embodiment are shown in table 5.
As can be seen from the detailed graph of the MTF transfer function in FIG. 5, the resolution is high, the central MTF value of 30lp/mm spatial frequency is greater than 0.7, the edge MTF value is greater than 0.3, and the image quality is good; referring to fig. 6 (a) and (B), it can be seen that the curvature of field and distortion are small and the imaging quality is good.
In this particular embodiment, the focal length f=19.68 mm of the eyepiece optical system; horizontal field angle fov=44.8 °; the exit pupil distance is 25.0mm; the distance ttl= 34.96mm on the optical axis I from the eye side 11 of the first lens 1 to the display 6.
Example III
As shown in fig. 7, in this embodiment, the surface roughness and refractive index of each lens are the same as those of the first embodiment, and only the optical parameters such as the radius of curvature and the lens thickness of each lens surface are different.
The detailed optical data of this particular example are shown in Table 3-1.
Table 3-1 detailed optical data for example three
For detailed data of the parameters of each aspheric surface in this embodiment, please refer to the following table:
| Surface of the body | K | A4 | A6 | A8 | A10 | A12 |
| 11 | 15.922 | -1.44E-05 | 4.64E-08 | -6.75E-12 | -1.40E-13 | 0.00E+00 |
| 12 | -0.754 | 2.40E-05 | 1.63E-07 | -1.35E-10 | -6.19E-13 | 0.00E+00 |
| 21 | 4.106 | 5.67E-06 | 1.11E-07 | 1.59E-10 | -3.78E-13 | 1.30E-15 |
| 22 | -1.243 | -1.02E-05 | -5.25E-08 | 1.60E-10 | 1.22E-12 | -8.05E-16 |
The values of the related conditional expressions of this embodiment are shown in table 5.
The MTF transfer function chart of this embodiment is shown in fig. 8, and it can be seen that the resolution is high, the central MTF value of 30lp/mm spatial frequency is greater than 0.8, the edge MTF value is greater than 0.25, and the image quality is good; referring to fig. 9 (a) and (B), it can be seen that the curvature of field and distortion are small and the imaging quality is good.
In this particular embodiment, the focal length f=19.62 mm of the eyepiece optical system; horizontal field angle fov=44.7 °; the exit pupil distance is 25.0mm; the distance ttl=35.02 mm on the optical axis I from the eye side 11 of the first lens 1 to the display screen 6.
Example IV
As shown in fig. 10, in this embodiment, the surface roughness and refractive index of each lens are the same as those of the first embodiment, and only the optical parameters such as the radius of curvature and the lens thickness of each lens surface are different.
The detailed optical data of this particular example are shown in Table 4-1.
Table 4-1 detailed optical data for example four
For detailed data of the parameters of each aspheric surface in this embodiment, please refer to the following table:
| Surface of the body | K | A4 | A6 | A8 | A10 | A12 |
| 11 | 15.720 | -1.59E-05 | 3.62E-08 | -3.40E-11 | -6.06E-14 | 0.00E+00 |
| 12 | -0.727 | 2.37E-05 | 1.63E-07 | -1.62E-10 | -6.35E-13 | 0.00E+00 |
| 21 | 4.230 | 6.41E-06 | 1.05E-07 | 1.59E-10 | -3.31E-13 | 1.46E-15 |
| 22 | -1.322 | -1.02E-05 | -5.76E-08 | 1.52E-10 | 1.23E-12 | -6.33E-16 |
The values of the related conditional expressions of this embodiment are shown in table 5.
The MTF transfer function chart of this embodiment is shown in fig. 11, and it can be seen that the resolution is high, the central MTF value of 30lp/mm spatial frequency is greater than 0.8, the edge MTF value is greater than 0.25, and the image quality is good; referring to fig. 12 (a) and (B), it can be seen that the curvature of field and distortion are small and the imaging quality is good.
In this particular embodiment, the focal length f=19.70 mm of the eyepiece optical system; horizontal field angle fov=44.7 °; the exit pupil distance is 25.0mm; the distance ttl=35.02 mm on the optical axis I from the eye side 11 of the first lens 1 to the display screen 6.
Table 5 values of relevant important parameters for four embodiments of the present invention
| First embodiment | Second embodiment | Third embodiment | Fourth embodiment | |
| nd4-nd3 | 0.07 | 0.07 | 0.07 | 0.07 |
| vd3-vd4 | 21.30 | 22.20 | 22.80 | 22.80 |
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. An eyepiece optical system for imaging an imaging light ray from a display screen through the eyepiece optical system into an eye of an observer, the direction towards the eye being the eye side and the direction towards the display screen being the display side, characterized in that: the eyepiece optical system sequentially comprises a first lens, a second lens and a third lens from the eye side to the display side along an optical axis; the first lens to the fourth lens respectively comprise a mesh side surface facing the mesh side and allowing imaging light rays to pass through and a display side surface facing the display side and allowing imaging light rays to pass through;
The first lens has positive refractive index, the eye side surface of the first lens is a convex surface, and the display side surface of the first lens is a convex surface;
the second lens has positive refractive index, the eye side surface of the second lens is a concave surface, and the display side surface of the second lens is a convex surface;
the third lens has positive refractive index, the side surface of the eye of the third lens is a convex surface, and the display side surface of the third lens is a convex surface;
The fourth lens has negative refractive index, the eye side surface of the fourth lens is a concave surface, and the display side surface of the fourth lens is a concave surface;
the eye side surface and the display side surface of the first lens and the second lens are aspheric; the third lens and the fourth lens are glued mutually, and the third lens and the fourth lens are glass lenses;
The eyepiece optical system has only the first to fourth lenses, and satisfies: nd4-nd3 is less than or equal to 0.07, and vd3-vd4 is more than or equal to 20, wherein nd3 is the refractive index of the third lens, nd4 is the refractive index of the fourth lens, vd3 is the dispersion coefficient of the third lens, and vd4 is the dispersion coefficient of the fourth lens.
2. The eyepiece optical system of claim 1 wherein: the first lens and the second lens are made of plastic materials.
3. The eyepiece optical system of claim 1, the eyepiece optical system is characterized in that the eyepiece optical system further satisfies: nd3 and nd4 are respectively 1.88 and 2.00.
4. The eyepiece optical system of claim 1, the eyepiece optical system is characterized in that the eyepiece optical system further satisfies: and nd1 is equal to or less than 1.54, wherein nd1 is the refractive index of the first lens.
5. The eyepiece optical system of claim 1, the eyepiece optical system is characterized in that the eyepiece optical system further satisfies: and nd2 is 1.64.ltoreq.nd 2, wherein nd2 is the refractive index of the second lens.
6. The eyepiece optical system of claim 1, the eyepiece optical system is characterized in that the eyepiece optical system further satisfies: TTL is less than or equal to 35.1mm, wherein TTL is the distance from the eye side surface of the first lens to the display picture on the optical axis.
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| CN115291382A (en) * | 2022-07-28 | 2022-11-04 | 京东方科技集团股份有限公司 | Eyepiece lens system and near-to-eye display device |
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| CN213780538U (en) * | 2020-12-30 | 2021-07-23 | 厦门力鼎光电股份有限公司 | Eyepiece optical system |
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| TWI411812B (en) * | 2006-03-31 | 2013-10-11 | Hitachi Maxell | Camera lens assembly |
| TWM398126U (en) * | 2010-07-20 | 2011-02-11 | Asia Optical Co Inc | Wide-angle lens |
| CN104898256B (en) * | 2015-02-13 | 2017-06-06 | 玉晶光电(厦门)有限公司 | Optical imaging lens and the electronic installation using the optical imaging lens |
| US10215978B2 (en) * | 2015-11-13 | 2019-02-26 | Shenzhen Ned Optics Co., Ltd. | Eyepiece optical system with large field-of-view angle and head-mounted display apparatus |
| CN106970464B (en) * | 2017-01-11 | 2019-06-21 | 玉晶光电(厦门)有限公司 | Eyepiece optical system |
| CN110542997B (en) * | 2019-10-10 | 2024-05-17 | 厦门力鼎光电股份有限公司 | Optical imaging lens |
| CN111781715A (en) * | 2020-08-10 | 2020-10-16 | 厦门力鼎光电股份有限公司 | Wide-angle low-distortion optical imaging lens |
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| CN213780538U (en) * | 2020-12-30 | 2021-07-23 | 厦门力鼎光电股份有限公司 | Eyepiece optical system |
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