CN211348827U - Endoscopic imaging device with lens and hyperspectral - Google Patents

Endoscopic imaging device with lens and hyperspectral Download PDF

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Publication number
CN211348827U
CN211348827U CN201921937908.XU CN201921937908U CN211348827U CN 211348827 U CN211348827 U CN 211348827U CN 201921937908 U CN201921937908 U CN 201921937908U CN 211348827 U CN211348827 U CN 211348827U
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lens
focal length
positive diopter
imaging
mirror
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赵辉
梁洪易
罗飞
梁朝阳
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Shenzhen Wayho Technology Ltd
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Abstract

The utility model is suitable for an optics technical field provides a camera lens and imaging device is peeped in to high spectrum, the camera lens is including the first lens that has positive diopter, the second lens that has positive diopter, the third lens that has positive diopter, the fourth lens that has negative diopter, the fifth lens that has positive diopter, the sixth lens that has positive diopter and the seventh lens that has positive diopter, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, sixth lens and seventh lens set up with the optical axis, and arrange in proper order from the object side to picture side along the optical axis. The first converging lens, the second converging lens and the fourth lens with negative focal length are arranged between the first lens serving as the objective lens and the seventh lens serving as the image side lens, so that the chromatic aberration of the lens can be eliminated through reasonable material selection and design, each waveband in a wide spectral range can be clearly imaged, the diameter of the lens is effectively reduced, and the lens can be arranged in a narrow space where the end part of the imaging optical fiber extends into.

Description

Endoscopic imaging device with lens and hyperspectral
Technical Field
The utility model relates to the technical field of optics, in particular to imaging device is peeped with to camera lens and high spectrum.
Background
The hyperspectral endoscopic imaging is one of the latest imaging technologies at present, can realize hyperspectral imaging on in-vivo tissues of a patient while carrying out routine endoscopic examination on the patient, obtains the histological spectral characteristics of in-vivo mucosa of the patient in real time, and provides help for doctors to carry out clinical diagnosis and cancer prevention. In the hyperspectral endoscopic imaging technology, an optical fiber endoscopic probe with hyperspectral imaging capability is one of the key technologies of endoscopic imaging.
With the continuous refinement of the imaging fiber bundle technology, the hyperspectral endoscopic imaging device has higher and higher requirements on the optical performance of an endoscope, and in addition to the desire to obtain a larger image field of view with a smaller caliber and a shorter length, higher requirements are also put forward on the applicable spectral range of an endoscope head. The traditional endoscope lens has poor capability of eliminating chromatic aberration, so that the bandwidth of the hyperspectral endoscopic imaging device is very limited.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a camera lens, it is poor to aim at solving traditional optical lens achromatism ability, and spectral range that can clear formation of image is little technical problem.
The utility model discloses a realize like this, a camera lens, the camera lens is including the first lens that has positive diopter, the second lens that has positive diopter, the third lens that has positive diopter, the fourth lens that has negative diopter, the fifth lens that has positive diopter, the sixth lens that has positive diopter and the seventh lens that has positive diopter, first lens, second lens, third lens, fourth lens, fifth lens, sixth lens and seventh lens set up with the optical axis, and follow the optical axis is arranged in proper order from the object side to picture side.
In an embodiment of the present invention, the first focusing lens includes a second lens and a third lens, the second focusing lens includes a fifth lens and a sixth lens, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged along the optical axis in sequence, the refractive index of the first lens is higher than the refractive index of the second lens and the third lens, and the abbe number of the first lens is lower than the abbe numbers of the second lens and the third lens.
In an embodiment of the present invention, a refractive index of the first lens is 1.8 or more.
In an embodiment of the present invention, among the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens, a refractive index of the fourth lens is the highest, and an abbe number of the fourth lens is the lowest.
In one embodiment of the present invention, the operating spectral range of the lens covers a wavelength range from 400nm to 1000 nm.
In an embodiment of the present invention, the first lens and the seventh lens are concave-convex lenses, and a surface of the first lens facing the object space and a surface of the seventh lens facing the image space are both concave surfaces.
In an embodiment of the present invention, a plane portion is disposed around a concave surface of the first lens facing the object space.
In an embodiment of the present invention, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all spherical lenses.
In an embodiment of the present invention, the diameter of the lens is less than or equal to 4mm, the length is less than or equal to 15mm, the object viewing field is greater than or equal to 270um, the image viewing field is greater than or equal to 600um, the focal length f1 of the first lens, the focal length f2 of the second lens, the focal length f3 of the third lens, the focal length f4 of the fourth lens, the focal length f5 of the fifth lens, the focal length f6 of the sixth lens, the focal length f7 of the sixth lens, satisfy the following relations:
3.0354mm≤f1≤3.7099mm;
6.3807mm≤f2≤7.7987mm;
5.5911mm≤f3≤6.8336mm;
-2.8866mm≤f4≤-2.3618mm;
6.9676mm≤f5≤8.5159mm;
8.7779mm≤f6≤10.7286mm;
7.5707mm≤f7≤9.2530mm。
another object of the present invention is to provide an endoscopic hyperspectral imaging device using the lens, the endoscopic hyperspectral imaging device further comprises an illumination assembly, an image transmission optical fiber bundle and a hyperspectral camera, the lens is used for entering the imaging and coupling of the internal tissue the image transmission optical fiber bundle, the illumination assembly is used for illuminating the internal tissue, the image transmission optical fiber bundle is connected to the lens with the hyperspectral camera, for transmitting the imaging of the internal tissue to the hyperspectral camera.
Implement the utility model discloses an endoscopic imaging device is peeped to camera lens and high spectrum has following beneficial effect at least:
the utility model provides a camera lens, set gradually the first convergent lens that second lens and third lens are constituteed between the first lens as objective and the seventh lens as image side camera lens, the second convergent lens that fourth lens and fifth lens and sixth lens are constituteed, wherein fourth lens focus is the burden, thus, can be through reasonable selection material and design, the colour difference of camera lens is eliminated to a great extent, can be to the clear formation of image of each wave band in the wide spectral range, and effectively reduced the diameter of camera lens, make it can set up in the tip of formation of image optic fibre stretches into narrow and small space, carry out the high spectral imaging of high definition to the object side space.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in 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 it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of a lens provided in an embodiment of the present invention;
fig. 2 is a modulation transfer curve diagram of a lens provided by an embodiment of the present invention;
fig. 3 is a root-mean-square diameter graph of a lens provided by an embodiment of the present invention;
fig. 4 is an external schematic view of a lens provided in an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a hyperspectral endoscopic imaging device according to an embodiment of the present invention.
Reference numerals referred to in the above figures are detailed below:
1-a lens; 10-a first lens; 20-a second lens; 30-a third lens; 40-a fourth lens; 50-a fifth lens; 60-a sixth lens; 70-a seventh lens; 101-a first mirror; 102-a second mirror; 103-a third mirror; 104-fourth mirror; 105-a fifth mirror; 106-sixth mirror; 107-seventh mirror; 108-eighth mirror; 109-ninth mirror; 110-tenth mirror; 111-eleventh mirror; 112-twelfth mirror; 113-a thirteenth mirror; 114-fourteenth mirror; 2-an image transmission fiber bundle; 3-a lighting assembly; 4-hyperspectral camera.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and not to be construed as limiting the technical solution. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.
In order to explain the technical solution of the present invention, the following detailed description is made with reference to the specific drawings and examples.
Referring to fig. 1 and 4, the present embodiment provides a lens 1, including a first lens 10 having a positive refractive power, a second lens 20 having a positive refractive power, a third lens 30 having a positive refractive power, a fourth lens 40 having a negative refractive power, a fifth lens 50 having a positive refractive power, a sixth lens 60 having a positive refractive power, and a seventh lens 70 having a positive refractive power, wherein the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50, the sixth lens 60, and the seventh lens 70 are disposed on the same optical axis and are sequentially arranged from an object side to an image side along the optical axis.
A first convergent lens consisting of a second lens and a third lens, a fourth lens 40 and a second convergent lens consisting of a fifth lens and a sixth lens are sequentially arranged between a first lens 10 serving as an objective lens and a seventh lens 70 serving as an image side lens 1, wherein the focal length of the fourth lens is negative, so that the chromatic aberration of the lens 1 can be eliminated to a great extent through reasonable material selection and design, and each waveband in a wide spectral range can be imaged clearly; moreover, by controlling the refractive power and the dispersion coefficient of the first converging lens and the second converging lens, the light between the first lens 10 and the fourth lens 40 and between the fourth lens 40 and the seventh lens 70 can be converged while further enhancing the achromatization capability of the lens 1, so that the diameter of the lens 1 is effectively reduced, the lens 1 can be arranged in a narrow space where the end part of the imaging optical fiber extends, and high-definition hyperspectral imaging is carried out in an object space.
As an alternative to the present embodiment, the aperture stop of the lens 1 is located at the fourth lens 40.
Referring to fig. 1, in an embodiment of the present invention, the refractive index of the first lens 10 is higher than the refractive indices of the second lens 20 and the third lens 30, and the abbe number of the first lens 10 is lower than the abbe numbers of the second lens 20 and the third lens 30. The first converging lens is formed by the second lens 20 and the third lens 30, and the second converging lens is formed by the fifth lens 50 and the sixth lens 60, so that the refractive power and the dispersion power of the first converging lens and the second converging lens are more conveniently controlled, the material selection design of the lens 1 is facilitated, the chromatic aberration eliminating capability of the lens 1 is improved, and the applicable wavelength range of the lens 1 is widened.
Referring to fig. 1, as a preferred embodiment of the present embodiment, the second lens 20 and the third lens 30 are both convex lenses, a surface of the second lens 20 with a smaller curvature radius is opposite to a surface of the third lens 30 with a smaller curvature radius, the fifth lens 50 and the sixth lens 60 are both convex lenses, a surface of the fifth lens 50 with a smaller curvature radius is opposite to a surface of the sixth lens 60 with a smaller curvature radius, and the fourth lens 40 is a biconcave lens, so that the diameter of the lens 1 can be further reduced, and the wavelength range of the lens 1 capable of eliminating chromatic aberration is widened.
In an embodiment of the present invention, in the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50, the sixth lens 60, and the seventh lens 70, the fourth lens 40 has the highest refractive index and the lowest abbe number, and as a preferred embodiment of the present embodiment, the fourth lens 40 is made of a glass material with a sufficiently large refractive index and a sufficiently small abbe number, such as a glass material with a model N-SF66, which is selected from crown glass, flint glass, barium crown glass, light crown glass, or heavy crown glass, so as to ensure that the fourth lens 40 has a sufficiently high refractive index and a sufficiently low abbe number to correct chromatic aberration of the lens 1, and to widen a wave band width of the lens 1 capable of imaging clearly.
In an embodiment of the present invention, the refractive index of the first lens 10 is higher than that of the second lens 20 and the third lens 30, the abbe number of the first lens 10 is lower than that of the second lens 20 and the third lens 30, the refractive index of the seventh lens 70 is higher than that of the fifth lens 50 and the sixth lens 60, and the abbe number of the seventh lens 70 is lower than that of the fifth lens 50 and the sixth lens 60, so that the numerical aperture of the lens 1 and the ability of eliminating chromatic aberration in a wide wavelength range can be improved.
In an embodiment of the present invention, the refractive index of the first lens 10 is greater than or equal to 1.8, which can obtain a higher numerical aperture, and converge the light beam of the object space to the optical axis. In a preferred embodiment of the present invention, the first lens 10 is made of a glass material having a refractive index of 1.8 or more selected from crown glass, flint glass, barium crown glass, light crown glass, and dense crown glass, for example, a glass material of type N-LASF31A, and is formed as a meniscus lens, and the first mirror 101 is formed on a surface facing the object space, and the first mirror 101 is a concave surface having a flat surface portion formed around the concave surface. Due to the design, the first lens 10 can be suitable for a more complex object space environment, the first mirror surface 101 is ensured to be in contact with air, the tissue inside a human body can be conveniently imaged, and the object space environment under various common media can be clearly imaged in a wide wavelength range; the first mirror surface 101 is arranged to be a concave surface, and a plane part is designed around the concave surface, so that the first mirror surface 101 directly contacting with the object space can be prevented from being scratched and damaged.
Referring to fig. 1, in an embodiment of the present invention, the seventh lens element 70 is a concave-convex lens element, and a surface of the concave-convex lens element facing the image space is a concave surface, so as to prevent scratch and damage during the installation process.
In one embodiment of the present invention, the working spectrum range of the lens covers the wavelength range of 400nm to 1000 nm.
In an embodiment of the present invention, the first lens 10, the fourth lens 40 and the seventh lens 70 are all spherical lenses, and the first converging lens and the second converging lens are all composed of spherical lenses, that is, the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50, the sixth lens 60 and the seventh lens 70 are all composed of spherical lenses, which facilitates the processing and grinding of the lenses.
The utility model discloses an embodiment, the diameter less than or equal to 4mm of camera lens 1, length less than or equal to 15mm, object space visual field 270um, image space visual field 600um are convenient for stretch into narrower and small space and carry out the high spectral imaging to narrow and small space, are particularly useful for the endoscopic equipment of human tissue, are convenient for carry out the high spectral imaging analysis to tissues such as the inside mucosa of human body.
Referring to fig. 5, another object of the present invention is to provide an endoscopic hyperspectral imaging apparatus using the lens 11 as described above, the endoscopic hyperspectral imaging apparatus further includes an illumination assembly 3, an image transmission fiber bundle 2 and a hyperspectral camera 4, the lens 11 is used for imaging and coupling the internal tissue into the image transmission fiber bundle 2, the illumination assembly 3 is used for illuminating the internal tissue, and the image transmission fiber bundle 2 connects the lens 11 and the hyperspectral camera 4 for transmitting the imaging of the internal tissue by the lens 11 to the hyperspectral camera 4.
The following describes advantageous effects of the lens provided by embodiments of the present invention with specific embodiments.
Example one
In this embodiment, the lens includes a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, a sixth lens 60, and a seventh lens 70, a medium between the lenses is air or vacuum, the first lens 10 is made of a material with a high refractive index and a low abbe number, and optionally, the first lens 10 is made of an N-LASF31A glass material with a refractive index of 1.8 or more; the second lens 20, the third lens 30, the fifth lens 50, the sixth lens 60 and the seventh lens 70 are made of a material having a refractive index of 1.4-1.7. Alternatively, N-PK52A glass, N-FK5HTI glass, N-PSK3 glass, N-SF5 glass, or the like can be used; the fourth lens 40 is made of a material having a high refractive index and a sufficiently low abbe number. Specifically, the fourth lens 40 is ground with N-SF66 glass in this embodiment. By reasonably designing the mirror surfaces of the lenses, the lenses can achieve excellent chromatic aberration elimination effect on chromatic light with various wavelengths within the range of 400nm-1000 nm.
Example two
This example is a more specific embodiment of the first example, where first lens 10 is made of N-LASF31A glass, second lens 20 and sixth lens 60 are made of N-PK52A glass, third lens 30 is made of N-FK5HTI glass, fourth lens 40 is made of N-SF66 glass, fifth lens 50 is made of N-PSK3 glass, and seventh lens 70 is made of N-SF5 glass.
In the present embodiment, the first to fourteenth mirror surfaces are respectively provided from the surface of the first lens 10 contacting the object space to the surface of the seventh lens 70 contacting the image space, the radius of curvature of the mirror surface on the object space side of the spherical center of the curved surface is set to be negative, and the radius of curvature and the pitch of each mirror surface are respectively set as follows (data unit is mm):
the radius of curvature of the first mirror 101 is-0.88, and the distance from the next mirror is 1.363;
the radius of curvature of the second mirror 102 is-1.14, spaced 1 from the next mirror;
the radius of curvature of the third mirror 103 is-4518.99, the distance 2.861 from the next mirror;
the radius of curvature of the fourth mirror 104 is-3.93, and the distance from the next mirror is 1;
the radius of curvature of the fifth mirror 105 is 4.24, which is spaced from the next mirror by 1.557;
the radius of curvature of the sixth mirror 106 is-10.32, which is spaced from the next mirror by 1;
the radius of curvature of the seventh mirror 107 is-6.67, spaced 1 from the next mirror;
the radius of curvature of the eighth mirror 108 is 4.22, and the distance from the next mirror is 1.102;
the ninth mirror 109 has a radius of curvature of 19.78, which is spaced 1.594 from the next mirror;
the tenth mirror 110 has a radius of curvature of-4.77 and is spaced 1 from the next mirror;
the eleventh mirror 111 has a radius of curvature of 7.64, spaced 1.526 from the next mirror;
the radius of curvature of the twelfth mirror 112, is-19.28, spaced 4.862 from the next mirror;
the thirteenth mirror 113 radius of curvature of 3.42, spaced from the next mirror 1.314;
fourteenth mirror 114 has a radius of curvature of 8.64.
Thus, the diameter of the lens 1 is less than or equal to 4mm, the length is less than or equal to 15mm, the object field is greater than or equal to 270um, the image field is greater than or equal to 600um, and if the focal length f1 of the first lens, the focal length f2 of the second lens, the focal length f3 of the third lens, the focal length f4 of the fourth lens, the focal length f5 of the fifth lens, the focal length f6 of the sixth lens, and the focal length f7 of the seventh lens satisfy the following relationships:
3.0354mm≤f1≤3.7099mm;
6.3807mm≤f2≤7.7987mm;
5.5911mm≤f3≤6.8336mm;
-2.8866mm≤f4≤-2.3618mm;
6.9676mm≤f5≤8.5159mm;
8.7779mm≤f6≤10.7286mm;
7.5707mm≤f7≤9.2530mm。
as shown in fig. 2 and 3, the lens thus configured can obtain an MTF (Modulation Transfer Function) curve higher than 0.3 when imaging at a position 3mm behind the fourteenth mirror 114, and as can be seen from a view field position-RMS (Root Mean Square Root diameter) relation graph shown in fig. 3, a Root Mean Square diameter better than 3.5 μm can be obtained in the full view field range, and high-quality hyperspectral imaging can be realized for a cell tissue.
More intuitively, and data accurately, the parameters of the first through twelfth mirrors are as follows:
Figure BDA0002268585490000091
the units of radius, interval and focal length are all mm;
the glass material in table one is from the schottky glass library, and those skilled in the art can replace the glass material used in the existing system according to the glass replacement principle with reference to the following table, as shown below.
Figure BDA0002268585490000101
When the glass is replaced, glass having a close abbe number should be selected as much as possible, and crown glass having a high refractive index should be selected as much as possible as the positive lens. To ensure constant focal power, the radius of the lens should be finely adjusted after glass replacement, and the lens is newRefractive index nnewNew radius of curvature rnewAnd the original refractive index n and the original curvature radius r satisfy the following relations:
Figure BDA0002268585490000102
in addition, glass manufactured by Ohara Kagaku Kogyo, Hoya Kagaku, Corning, Sumita, Nikon and other manufacturers can be used instead of the glass, and it should be specifically noted that glass materials of different manufacturers can be used instead of the glass materials of only one manufacturer.
The above description is only an alternative embodiment of the present invention, and should not be construed as limiting the present invention, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A lens barrel is characterized by comprising a first lens with positive diopter, a second lens with positive diopter, a third lens with positive diopter, a fourth lens with negative diopter, a fifth lens with positive diopter, a sixth lens with positive diopter and a seventh lens with positive diopter, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged on the same optical axis and are sequentially arranged from an object side to an image side along the optical axis.
2. The lens barrel according to claim 1, wherein a refractive index of the first lens is higher than refractive indices of the second lens and the third lens, and an abbe number of the first lens is lower than abbe numbers of the second lens and the third lens.
3. The lens barrel as claimed in claim 2, wherein the refractive index of the first lens is 1.8 or more.
4. The lens barrel as claimed in claim 3, wherein the fourth lens has the highest refractive index and the lowest Abbe number among the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens.
5. The lens barrel as claimed in any one of claims 1 to 4, wherein the operational spectral range of the lens covers a wavelength band of 400nm to 1000 nm.
6. The lens barrel according to any one of claims 1 to 4, wherein the first lens and the seventh lens are both meniscus lenses, and a surface of the first lens facing the object space and a surface of the seventh lens facing the image space are concave surfaces.
7. The lens barrel as claimed in claim 6, wherein a flat portion is provided around a concave surface of the first lens facing the object space.
8. The lens barrel as claimed in any one of claims 1 to 4, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all spherical lenses.
9. A lens barrel according to any one of claims 1 to 4, wherein the lens barrel has a diameter of 4mm or less, a length of 15mm or less, an object field of view of 270um or more, an image field of view of 600um or more, a focal length f1 of the first lens, a focal length f2 of the second lens, a focal length f3 of the third lens, a focal length f4 of the fourth lens, a focal length f5 of the fifth lens, a focal length f6 of the sixth lens, and a focal length f7 of the sixth lens, and satisfies the following relationships:
3.0354mm≤f1≤3.7099mm;
6.3807mm≤f2≤7.7987mm;
5.5911mm≤f3≤6.8336mm;
-2.8866mm≤f4≤-2.3618mm;
6.9676mm≤f5≤8.5159mm;
8.7779mm≤f6≤10.7286mm;
7.5707mm≤f7≤9.2530mm。
10. a hyperspectral endoscopic imaging apparatus comprising the lens of any of claims 1 to 9, further comprising an illumination assembly, an imaging fiber bundle and a hyperspectral camera, the lens for imaging and coupling of in vivo tissue into the imaging fiber bundle, the illumination assembly for illuminating in vivo tissue, the imaging fiber bundle connecting the lens and the hyperspectral camera for transmitting the lens imaging in vivo tissue to the hyperspectral camera.
CN201921937908.XU 2019-11-11 2019-11-11 Endoscopic imaging device with lens and hyperspectral Active CN211348827U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113946035A (en) * 2021-11-08 2022-01-18 华中科技大学 Large-view-field bifocal lens with outer diameter of 2.6mm

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113946035A (en) * 2021-11-08 2022-01-18 华中科技大学 Large-view-field bifocal lens with outer diameter of 2.6mm

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