CN119781138B - A portable large-field-of-view fundus camera optical system - Google Patents
A portable large-field-of-view fundus camera optical systemInfo
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- CN119781138B CN119781138B CN202411927184.6A CN202411927184A CN119781138B CN 119781138 B CN119781138 B CN 119781138B CN 202411927184 A CN202411927184 A CN 202411927184A CN 119781138 B CN119781138 B CN 119781138B
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Abstract
本发明涉及一种便携大视场眼底相机光学系统，该系统采用四片式作为网膜物镜，通过改进高斯镜组作为成像镜组，采用二次成像，视网膜先通过网膜物镜在系统中央进行成像，中央像再经过调焦镜组与成像镜组最终成像在CMOS传感器，最终获取清晰的眼底图像。同时采用平凹透镜作为高斯镜组中的调焦透镜。该系统光学设计结构简单，制作成本低，相较于市面上的便携式眼底相机，镜片数量更少，且没有用到非球面镜便能满足大视场，大范围调焦的要求，系统长度小于190mm，符合便携式要求。
The present invention relates to a portable, large-field-of-view fundus camera optical system. This system utilizes a four-lens retinal objective lens and an improved Gaussian lens assembly as the imaging lens assembly. This system employs secondary imaging, with the retina first being imaged at the center of the system by the retinal objective lens. The central image then passes through a focusing lens assembly and an imaging lens assembly, ultimately forming an image on a CMOS sensor, ultimately acquiring a clear fundus image. Furthermore, a plano-concave lens is employed as the focusing lens in the Gaussian lens assembly. This system exhibits a simple optical design and low manufacturing cost. Compared to commercially available portable fundus cameras, this system utilizes fewer lenses and, without the use of aspheric lenses, meets the requirements of a large field of view and wide focusing range. The system length is less than 190 mm, meeting portability requirements.
Description
Technical Field
The invention relates to the field of ophthalmic optical instruments, in particular to a portable large-view-field fundus camera optical system.
Background
The retina is used as the only tissue of the whole body which can observe blood vessels and distribution states thereof under living and non-invasive conditions, and becomes an important window for diagnosing eye diseases and related systemic diseases at present. The most common ophthalmic diseases include cataract, glaucoma, conjunctivitis, etc., and the ocular diseases characterized by the appearance of the ophthalmic diseases, such as hypertension, diabetes, thrombus, etc., can be diagnosed early by the capillary vascular diseases of retina. In the current society, along with the improvement of the living standard of people, more and more people begin to pay attention to the health problem of the people, the retinal vascular state is used as the pathological basis of fundus health and general diseases, and if fundus cameras can be widely applied to communities, schools and even families, the retinal vascular state has important medical value for early health screening.
The focusing range of the portable fundus camera at the present stage is mainly +/-10D, and the field angle is mainly 30-40 degrees. The focusing device has the advantages of small focusing range, small visual field and high manufacturing cost. And most of the selective barrier objectives are aspherical due to the field of view limitation. In addition, the design process is required to meet the portable requirement, high resolution is met, the system volume is limited, and the view field range and the focusing range are difficult to be simultaneously considered in the design process. As in reference "optical design of a novel portable fundus camera", the focusing range of the fundus camera reaches ±15d, but its angle of view is only 40 ° [1]. The field angle of the fundus camera provided in the development design of the fundus camera optical apparatus system based on mobile equipment reaches 50 degrees, but the focusing range thereof reaches only + -10D 2. The angle of view of the novel mydriasis-free portable fundus camera reaches 60 degrees, but the focusing range of the novel mydriasis-free portable fundus camera only reaches-8D to +10D3.
Reference is made to:
[1] Optical design of novel portable fundus camera [ D ] Jiangsu university, su university, 2021.
[2] Dong Ruya, hong Chaoyang, zheng Qingqing, etc. design of fundus camera optics system based on mobile device [ J ]. Chinese medical equipment, 2022 (007): 019.
[3] Liu Yue, yang Jiajiang, wang Qingfeng, etc. a novel mydriasis-free portable fundus camera 2012[2024-10-16].
The existing fundus camera is difficult to perform large-scale fundus screening, meets fundus screening requirements and covers remote areas, so that the design of the portable fundus camera with large visual field, simple structure, large focusing range, low cost and high resolution is particularly important.
Disclosure of Invention
Aiming at the defects in the prior art, the invention designs an optical imaging system based on the Gultstrand-Le Grand100 eye model, and provides a focusing optical imaging system which can realize a large field of view and meet a short-distance large-range focusing.
The specific technical scheme of the invention is as follows:
A portable large-view-field fundus camera optical system comprises a omentum objective lens, a focusing lens group and an imaging lens group which are sequentially arranged from left to right in a common optical axis manner;
the omentum objective comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged from left to right, wherein the first lens is a meniscus lens, the second lens is a biconvex lens, and the third lens and the fourth lens are combined into a biconvex lens;
The focusing lens group comprises a fifth lens, and the fifth lens is a plano-concave lens;
the imaging lens group comprises a front imaging lens group and a rear imaging lens group which are sequentially arranged from left to right, the front imaging lens group comprises a sixth lens, a seventh lens and an eighth lens which are sequentially arranged from left to right, the sixth lens is a plano-convex lens, the seventh lens and the eighth lens form a double-cemented lens, the rear imaging lens group comprises a ninth lens, a tenth lens, an eleventh lens and a twelfth lens which are sequentially arranged from left to right, the ninth lens and the tenth lens form a double-cemented lens, the eleventh lens is a meniscus lens, and the twelfth lens is a positive lens.
Preferably, the first lens has a first lens surface, a second lens surface, a third lens surface and a fourth lens surface in this order from left to right, the third lens and the fourth lens have a fifth lens surface, a sixth lens surface and a seventh lens surface, the first lens surface faces the right direction convex with a radius of curvature ranging from [122.31mm,123.31mm ], the second lens surface faces the right direction convex with a radius of curvature ranging from [41.9mm,42.9mm ], the third lens surface faces the left direction convex with a radius of curvature ranging from [319.07mm,320.07mm ], the fourth lens surface faces the right direction convex with a radius of curvature ranging from [68.53mm,69.53mm ], the fifth lens surface faces the left direction convex with a radius of curvature ranging from [57.55mm,58.55mm ], the sixth lens surface faces the right direction convex with a radius of curvature ranging from [54.83mm,55.83mm ], and the seventh lens surface faces the right direction convex with a radius ranging from [ 52.83 mm, 520.520 mm ].
Preferably, the first lens thickness range is [10.25mm,11.25mm ], the second lens thickness range is [10.61mm,11.61mm ], the third lens thickness range is [14.76mm,15.76mm ], and the fourth lens thickness range is [4.43mm,5.43mm ].
Preferably, the glass material of the first lens is H-LAK3, the glass material of the second lens is H-ZPK, the glass material of the third lens is H-ZPK5, and the glass material of the fourth lens is H-ZF62GT.
Preferably, the fifth lens has an eighth lens surface and a ninth lens surface in this order, the eighth lens surface is a plane, the ninth lens surface is convex toward the left, and the radius of curvature ranges are [18.46mm,19.46mm ].
Preferably, the fifth lens thickness range is [2.15mm,3.15mm ].
Preferably, the glass material of the fifth lens is H-LAK2A.
Preferably, from left to right, the sixth lens sequentially has a tenth lens surface, an eleventh lens surface, the seventh lens sequentially has a twelfth lens surface, a thirteenth lens surface, a fourteenth lens surface, the ninth lens sequentially has a fifteenth lens surface, a sixteenth lens surface, and a seventeenth lens surface, the eleventh lens sequentially has an eighteenth lens surface, a nineteenth lens surface, and the twelfth lens sequentially has a twentieth lens surface and a twenty-first lens surface; the tenth lens face is convex in the left direction, the range of curvature radius is [22.19mm,23.19mm ], the eleventh lens face is a plane, the twelfth lens face is convex in the left direction, the range of curvature radius is [9.52mm,10.52mm ], the thirteenth lens face is convex in the right direction, the range of curvature radius is [8.25mm,9.25mm ], the fourteenth lens face is convex in the left direction, the range of curvature radius is [21.32mm,22.32mm ], the fifteenth lens face is convex in the right direction, the range of curvature radius is [10.25mm,11.25mm ], the sixteenth lens face is convex in the left direction, the range of curvature radius is [4.34mm,5.34mm ], the seventeenth lens face is convex in the right direction, the range of curvature radius is [6.75mm,7.75mm ], the eighteenth lens face is convex in the right direction, the range of curvature radius is [21.32mm,22.32mm ], the fifteenth lens face is convex in the left direction, the range of curvature radius is [10.25mm,11.25mm, the sixteenth lens face is convex in the left direction, the range of curvature radius is [ 4.34.34 mm, the sixteenth lens face is 15.34 mm, the range of curvature radius is 15.21.25 mm, the seventeenth lens face is the seventeenth lens face, the range of curvature radius is the seventeenth lens face is the range of curvature radius is 15.21.25 mm, the seventeenth lens face, the fifteen mm, the range of the fifteenth lens face is the range of the lens face is the lens face.
Preferably, the sixth lens thickness range is [9.11mm,10.11mm ], the seventh lens thickness range is [7.8mm,8.8mm ], the eighth lens thickness range is [1.1mm,2.1mm ], the ninth lens thickness range is [3.16mm,4.16mm ], the tenth lens thickness range is [2.23mm,3.23mm ], the eleventh lens thickness range is [1.9mm,2.9mm ], and the twelfth lens thickness range is [7.62mm,8.62mm ].
Preferably, the glass material of the sixth lens is H-ZLAF50 0E, the glass material of the seventh lens is H-ZPK E, the glass material of the eighth lens is H-K3, the glass material of the ninth lens is H-F1, the glass material of the tenth lens is H-ZPK7, the glass material of the eleventh lens is H-ZF12, and the glass material of the twelfth lens is H-ZLAF A.
The beneficial effects of the invention are as follows:
The invention designs the fundus molding optical imaging system based on the Gullstrand-Le Grand100 eye model, can realize a large field of view, meets the requirement of short-distance large-range focusing optical imaging, and has the following advantages:
1. The mode of secondary imaging is adopted, the four-piece type omentum objective is utilized for central imaging, secondary imaging is realized through the imaging lens group, distortion caused by a large field of view is reduced, and an aspheric surface is not required to be used.
2. And combining the four-piece type omentum objective lens with the optimized Gaussian lens group to realize a large-view-field and high-resolution imaging system.
3. And the plano-concave lens is adopted to eliminate aberration and is used as a focusing lens group of the system, so that the focusing of a large range and a small distance is met.
4. The instrument has simple optical design structure and low manufacturing cost. Compared with the portable fundus camera on the market, the design has fewer lenses, and can meet the requirements of large visual field and large-scale focusing without using an aspherical mirror. The fundus camera optical system has a large field of view, the angle of view can reach 53.13 degrees, the system structure is simple, the system length is less than 190mm, and the portable fundus camera optical system meets the portable requirement.
Drawings
FIG. 1 is a schematic diagram of an optical system of a portable large-field fundus camera of the present invention;
Fig. 2 is a schematic view of a portable large field fundus camera of the present invention.
Detailed Description
The present invention is further illustrated below with reference to specific examples, which are not intended to limit the invention in any way.
Referring to fig. 1, the portable large-field fundus camera optical system of the invention is designed based on a Gullstrand-Le Grand eye model and comprises a omentum objective lens, a focusing lens group and an imaging lens group. The omentum objective lens, the focusing lens group and the imaging lens group are sequentially arranged on the common optical axis from left to right.
The omentum objective 200 comprises a first lens 210, a second lens 220, a third lens 230 and a fourth lens 240 which are arranged in sequence from left to right, wherein the first lens 210 is a meniscus lens, the second lens 220 is a biconvex lens, and the third lens 230 and the fourth lens 240 are combined into a biconvex lens.
The focusing lens assembly 300 includes a fifth lens element 310, and the fifth lens element 310 is a plano-concave lens.
The imaging lens assembly 400 comprises a front imaging lens assembly and a rear imaging lens assembly, wherein the front imaging lens assembly comprises a sixth lens 420, a seventh lens 430 and an eighth lens 440, the sixth lens 420 is a plano-convex lens, the seventh lens 430 and the eighth lens 440 form a double-cemented lens, the rear imaging lens assembly comprises a ninth lens 450, a tenth lens 460, an eleventh lens 470 and a twelfth lens 480, the ninth lens 450 and the tenth lens 460 form a double-cemented lens, the eleventh lens 470 is a meniscus lens and the twelfth lens 480 is a positive lens.
The system adopts four-piece type as a net film objective lens, and a Gaussian lens group is modified to be used as an imaging lens group. By adopting secondary imaging, retina firstly images in the center of the system through a omentum objective, and then the central image finally images on the CMOS sensor 500 through a focusing lens group and an imaging lens group, so as to finally obtain a clear fundus image. And a plano-concave lens is adopted as a focusing lens in the Gaussian lens group, so that large-range short-distance focusing is realized.
The first lens 210 sequentially has a first lens surface 201 and a second lens surface 202 from left to right, the second lens 220 has a third lens surface 203 and a fourth lens surface 204, the third lens 230 and the fourth lens 240 have a fifth lens surface 205, a sixth lens surface 206 and a seventh lens surface 207, the fifth lens 310 sequentially has an eighth lens surface 301 and a ninth lens surface 302, the sixth lens 420 sequentially has a tenth lens surface 401 and an eleventh lens surface 402, the seventh lens 430 and the eighth lens 440 sequentially has a twelfth lens surface 403, a thirteenth lens surface 404, a fourteenth lens surface 405, a ninth lens surface 450 and a tenth lens surface 460 sequentially have a fifteenth lens surface 406, a sixteenth lens surface 407 and a seventeenth lens surface 408, the eleventh lens 470 sequentially has an eighteenth lens surface 409, a nineteenth lens surface 410, and the twelfth lens 480 sequentially has a twentieth lens surface 411 and a twenty-first lens surface 412.
The first lens surface 201 is convex in the right direction with a radius of curvature ranging from [122.31mm,123.31mm ], the second lens surface 202 is convex in the right direction with a radius of curvature ranging from [41.9mm,42.9mm ], the third lens surface 203 is convex in the left direction with a radius of curvature ranging from [319.07mm,320.07mm ], the fourth lens surface 204 is convex in the right direction with a radius of curvature ranging from [68.53mm,69.53mm ], the fifth lens surface 205 is convex in the left direction with a radius of curvature ranging from [57.55mm,58.55mm ], the sixth lens surface 206 is convex in the right direction with a radius of curvature ranging from [54.83mm,55.83mm ], the seventh lens surface 207 is convex in the right direction with a radius of curvature ranging from [520.24mm,521.24mm ].
The eighth lens surface 301 is a flat surface, and the ninth lens surface 302 is convex in the left direction, and the radius of curvature thereof is in the range of 18.46mm,19.46 mm.
The tenth lens surface 401 is convex in the left direction with a curvature radius range of [22.19mm,23.19mm ], the eleventh lens surface 402 is a plane, the twelfth lens surface 403 is convex in the left direction with a curvature radius range of [9.52mm,10.52mm ], the thirteenth lens surface 404 is convex in the right direction with a curvature radius range of [8.25mm,9.25mm ], the fourteenth lens surface 405 is convex in the left direction with a curvature radius range of [21.32mm,22.32mm ], the fifteenth lens surface 406 is convex in the right direction with a curvature radius range of [10.25mm,11.25mm ], the sixteenth lens surface 407 is convex in the left direction with a curvature radius range of [4.34mm,5.34mm ], the seventeenth lens surface 404 is convex in the right direction with a curvature radius range of [6.75mm,7.75mm ], the eighteenth lens surface 409 is convex in the right direction with a curvature radius range of [5.26mm,6.26mm ], the fifteenth lens surface 406 is convex in the left direction with a curvature radius range of [ 10.25.25 mm,11.25mm ], the sixteenth lens surface 407 is convex in the left direction with a curvature radius range of [ 4.34.34.34 mm, 15.34 mm, and the nineteenth lens surface is convex in the left direction with a curvature range of [ 21.21.21.21.25 mm, 16.25 mm, 15.25 mm, the sixteenth lens surface is convex in the left direction with a curvature range of the radius range of [ 35.21.21.21.39 mm.
The first lens 210 has a thickness in the range of [10.25mm,11.25mm ], the second lens 220 has a thickness in the range of [10.61mm,11.61mm ], the third lens 230 has a thickness in the range of [14.76mm,15.76mm ], and the fourth lens 240 has a thickness in the range of [4.43mm,5.43mm ]. The fifth lens 310 has a thickness in the range of [2.15mm,3.15mm ]. The sixth lens 420 has a thickness in the range of [9.11mm,10.11mm ], the seventh lens 430 has a thickness in the range of [7.8mm,8.8mm ], the eighth lens 440 has a thickness in the range of [1.1mm,2.1mm ], the ninth lens 450 has a thickness in the range of [3.16mm,4.16mm ], the tenth lens 460 has a thickness in the range of [2.23mm,3.23mm ], the eleventh lens 470 has a thickness in the range of [1.9mm,2.9mm ], and the twelfth lens 480 has a thickness in the range of [7.62mm,8.62mm ].
The first lens 210 has a glass material of H-LAK3, the second lens 220 has a glass material of H-ZPK, the third lens 230 has a glass material of H-ZPK5, and the fourth lens 240 has a glass material of H-ZF62GT. The glass material of the fifth lens element 310 is H-LAK2A. The glass material of the sixth lens 420 is H-ZLAF50 0E, the glass material of the seventh lens 430 is H-ZPK E, the glass material of the eighth lens 440 is H-K3, the glass material of the ninth lens 450 is H-F1, the glass material of the tenth lens 460 is H-ZPK7, the glass material of the eleventh lens 470 is H-ZF12, and the glass material of the twelfth lens 480 is H-ZLAF A.
Example 1
In one embodiment of the present invention, the radii of curvature and thickness materials of the lens surfaces and lenses of the portable large field fundus camera optical system of the present invention are shown in tables 1-2.
Table 1 radius of curvature of each lens surface
Note that here, assuming that the lens surface and the main optical axis form an intersection, the radius of curvature of the lens surface is negative if the center of the sphere on which the lens surface is located is left of the intersection, whereas the radius of curvature of the lens surface is positive if the center of the sphere on which the lens surface is located is right of the intersection.
TABLE 2 thicknesses and materials of lenses
| Lens | Thickness/(mm) | Glass material |
| First lens 210 | 11.25 | H-LAK3 |
| Second lens 220 | 11.61 | H-ZPK5 |
| Third lens 230 | 15.76 | H-ZPK5 |
| Fourth lens 240 | 5.43 | H-ZF62GT |
| Fifth lens 310 | 3.15 | H-LAK2A |
| Sixth lens 420 | 10.11 | H-ZLAF50E |
| Seventh lens 430 | 8.8 | H-ZPK5 |
| Eighth lens 440 | 2.1 | H-K3 |
| Ninth lens 450 | 4.16 | H-F1 |
| Tenth lens 460 | 3.23 | H-ZPK7 |
| Eleventh lens 470 | 2.9 | H-ZF12 |
| Twelfth lens 480 | 8.62 | H-ZLAF75A |
The optical system of the above example was tested to find that the modulation transfer function MTF of the imaging system was 0.3 when the Nyquist frequency was 145 lp/mm. Meanwhile, the distance between the image plane of the optical system and the twenty-first lens surface 412 in this embodiment is 11.6mm, the distance between the image plane of the optical system and the first lens surface 201 in this embodiment is 190mm, and the distance between the first lens surface 201 and the human eye model 100 is 38mm. In this embodiment, the focusing range of the optical system is ±20d, when the focusing is +20d, the nyquist frequency is 145lp/mm, the modulation transfer function MTF of the imaging system is 0.2, and when the focusing is-20d, the nyquist frequency is 145lp/mm, the modulation transfer function MTF of the imaging system is 0.2. In this embodiment, when the focusing is +20d, the distance from the eighth lens surface to the seventh lens surface is 11.6mm. When focusing is-20D, the eighth lens face is 16.4mm from the seventh lens face. The total focusing distance was 4.8mm.
Table 3 modern optical processing grade
In order to verify the optical system, 1000 Monte Carlo tests are carried out on the optical system, a modern optical processing Q6 level tolerance coefficient is adopted for analysis, an imaging system modulation transfer function MTF-meridian vector average at the position of 145lp/mm of Nyquist frequency is used as a judging condition, a focusing lens is used as a compensator, and a compensation range of +/-0.2 is added. The imaging system modulation transfer function MTF is 0.256 when the Monte Carlo test has a 98% probability that the Nyquist frequency is 145lp/mm when the focusing lens group is at 0D, 0.226 when the Monte Carlo test has a 98% probability that the Nyquist frequency is 145lp/mm when the focusing lens group is at +20D, and 0.213 when the Monte Carlo test has a probability that the Nyquist frequency is greater than 98% when the focusing lens group is at-20D.
Further, the test was performed by actually machining the system setup, as shown in FIG. 2, by placing a target at a distance of 1m+38mm from the system, where 38mm is the distance of the theoretical system from the model of the human eye. Through tests, the image shooting height is 1.02m, the image shooting height is obtained through triangle sine function calculation, the field angle of the system is 53.13 degrees, and the requirements of a large field of view are met. The length of the system is not more than 190mm, and the portable requirement is met. And the internal focusing range is +/-20D, the moving distance of the focusing lens group is 4.8mm, the camera structure is simple, spherical lenses are adopted, and the cost is low.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (7)
1. The utility model provides a portable big visual field fundus camera optical system, includes from left to right net membrane objective, focusing lens group and the imaging lens group that the optical axis set up altogether in proper order, its characterized in that:
The omentum objective lens (200) comprises a first lens (210), a second lens (220), a third lens (230) and a fourth lens (240) which are sequentially arranged from left to right, wherein the first lens (210) is a meniscus lens, the second lens (220) is a biconvex lens, the third lens (230) and the fourth lens (240) are combined into a biconvex lens, the first lens (210) sequentially comprises a first lens surface (201) and a second lens surface (202) from left to right, the second lens (220) comprises a third lens surface (203) and a fourth lens surface (204), and the third lens (230) and the fourth lens (240) comprise a fifth lens surface (205), a sixth lens surface (206) and a seventh lens surface (207);
The first lens surface (201) is protruded in the right direction with a curvature radius range of [122.31mm,123.31mm ], the second lens surface (202) is protruded in the right direction with a curvature radius range of [41.9mm,42.9mm ], the third lens surface (203) is protruded in the left direction with a curvature radius range of [319.07mm,320.07mm ], the fourth lens surface (204) is protruded in the right direction with a curvature radius range of [68.53mm,69.53mm ], the fifth lens surface (205) is protruded in the left direction with a curvature radius range of [57.55mm,58.55mm ], the sixth lens surface (206) is protruded in the right direction with a curvature radius range of [54.83mm,55.83mm ], and the seventh lens surface (207) is protruded in the right direction with a curvature radius range of [ 520.83 mm, 521.242483 mm ];
The focusing lens group (300) comprises a fifth lens (310), wherein the fifth lens (310) is a plano-concave lens, the fifth lens (310) is sequentially provided with an eighth lens surface (301) and a ninth lens surface (302), the eighth lens surface (301) is a plane, the ninth lens surface (302) protrudes towards the left direction, and the curvature radius range of the ninth lens surface (302) is [18.46mm,19.46mm ];
the imaging lens group (400) comprises a front imaging lens group and a rear imaging lens group which are sequentially arranged from left to right;
The front group imaging lens group comprises a sixth lens (420), a seventh lens (430) and an eighth lens (440) which are sequentially arranged from left to right, wherein the sixth lens (420) is a plano-convex lens, and the seventh lens (430) and the eighth lens (440) form a double-cemented lens;
The rear imaging lens group comprises a ninth lens (450), a tenth lens (460), an eleventh lens (470) and a twelfth lens (480) which are sequentially arranged from left to right, wherein the ninth lens (450) and the tenth lens (460) form a double-cemented lens, the eleventh lens (470) is a meniscus lens, and the twelfth lens (480) is a positive lens;
From left to right, the sixth lens (420) sequentially has a tenth lens surface (401) and an eleventh lens surface (402), the seventh lens (430) and the eighth lens (440) sequentially have a twelfth lens surface (403), a thirteenth lens surface (404) and a fourteenth lens surface (405), the ninth lens (450) and the tenth lens (460) sequentially have a fifteenth lens surface (406), a sixteenth lens surface (407) and a seventeenth lens surface (408), the eleventh lens (470) sequentially has an eighteenth lens surface (409) and a nineteenth lens surface (410), and the twelfth lens (480) sequentially has a twentieth lens surface (411) and a twentieth lens surface (412);
The tenth lens surface (401) protrudes in the left direction, the curvature radius range of the tenth lens surface (401) is 22.19mm,23.19mm, the eleventh lens surface (402) is a plane, the twelfth lens surface (403) protrudes in the left direction, the curvature radius range of the thirteenth lens surface (404) is 9.52mm,10.52mm, the thirteenth lens surface (404) protrudes in the right direction, the curvature radius range of the thirteenth lens surface (404) is 8.25mm,9.25mm, the fourteenth lens surface (405) protrudes in the left direction, the curvature radius range of the fifteenth lens surface (406) is 21.32mm,22.32mm, the curvature radius range of the fifteenth lens surface (406) is 10.25mm,11.25mm, the sixteenth lens surface (407) protrudes in the left direction, the curvature radius range of the thirteenth lens surface (404) is 4.34mm,5.34mm, the seventeenth lens surface (408) protrudes in the right direction, the curvature radius range of the seventeenth lens surface (408) is 6.75mm, 7.26 mm, the eighteenth lens surface (37) is 21.26 mm, the curvature radius range of the seventeenth lens surface (37) is 16.21.25 mm, the fifteenth lens surface (37 mm), the fifteenth lens surface (37) protrudes in the left direction, the curvature radius range of the twenty.26.25 mm, the twenty-first lens surface (37) is 15.25 mm, the twenty-first lens surface (37) protrudes in the left direction, the twenty-first lens surface (37) is 35.25 mm), the radius range of the twenty-first lens surface (37.25 mm), the fifteenth lens surface (35.25) is 35.25 mm), the radius ranges (35.25 mm) protrudes in the radius ranges, the twenty-35.35 mm, the one mm (35 mm, the one lens surface (35 mm).
2. The portable large field fundus camera optical system according to claim 1, wherein the first lens (210) has a thickness in the range of [10.25mm,11.25mm ], the second lens (220) has a thickness in the range of [10.61mm,11.61mm ], the third lens (230) has a thickness in the range of [14.76mm,15.76mm ], and the fourth lens (240) has a thickness in the range of [4.43mm,5.43mm ].
3. The portable large-field fundus camera optical system according to claim 1, wherein the glass material of the first lens (210) is H-LAK3, the glass material of the second lens (220) is H-ZPK, the glass material of the third lens (230) is H-ZPK, and the glass material of the fourth lens (240) is H-ZF62GT.
4. The portable large field fundus camera optical system according to claim 1, wherein the fifth lens (310) has a thickness in the range of [2.15mm,3.15mm ].
5. The portable large-field fundus camera optical system according to claim 1, wherein the glass material of the fifth lens (310) is H-LAK2A.
6. The portable large field fundus camera optical system according to claim 1, wherein said sixth lens (420) has a thickness in the range of [9.11mm,10.11mm ], said seventh lens (430) has a thickness in the range of [7.8mm,8.8mm ], said eighth lens 440 has a lens thickness in the range of [1.1mm,2.1mm ], said ninth lens (450) has a thickness in the range of [3.16mm,4.16mm ], said tenth lens (460) has a thickness in the range of [2.23mm,3.23mm ], said eleventh lens (470) has a thickness in the range of [1.9mm,2.9mm ], and said twelfth lens (480) has a thickness in the range of [7.62mm,8.62mm ].
7. The portable large-field fundus camera optical system according to claim 1, wherein the glass material of the sixth lens (420) is H-ZLAF E, the glass material of the seventh lens (430) is H-ZPK E, the glass material of the eighth lens (440) is H-K3, the glass material of the ninth lens (450) is H-F1, the glass material of the tenth lens (460) is H-ZPK7, the glass material of the eleventh lens (470) is H-ZF12, and the glass material of the twelfth lens (480) is H-ZLAF a.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102688016A (en) * | 2012-03-07 | 2012-09-26 | 北京理工大学 | Novel mydriasis-free portable fundus camera |
| CN111543938A (en) * | 2020-04-10 | 2020-08-18 | 佛山科学技术学院 | A fundus camera optical system |
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| JP2011128445A (en) * | 2009-12-18 | 2011-06-30 | Sony Corp | Zoom lens and image pickup apparatus |
| KR102074429B1 (en) * | 2019-08-23 | 2020-02-06 | 주식회사 디오스텍 | Optical system of fundus camera for wide angle and light weight |
| CN111580246B (en) * | 2020-05-28 | 2021-11-09 | 佛山科学技术学院 | Portable eye ground camera optical system |
| CN217358946U (en) * | 2021-12-22 | 2022-09-02 | 江苏汇鼎光学眼镜有限公司 | Optical system for detecting chromatic aberration of spectacle lens |
| WO2024142829A1 (en) * | 2022-12-26 | 2024-07-04 | 株式会社ニコン | Optical system, optical device, and optical system manufacturing method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102688016A (en) * | 2012-03-07 | 2012-09-26 | 北京理工大学 | Novel mydriasis-free portable fundus camera |
| CN111543938A (en) * | 2020-04-10 | 2020-08-18 | 佛山科学技术学院 | A fundus camera optical system |
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