CN111580246B - Portable eye ground camera optical system - Google Patents

Portable eye ground camera optical system Download PDF

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CN111580246B
CN111580246B CN202010481976.0A CN202010481976A CN111580246B CN 111580246 B CN111580246 B CN 111580246B CN 202010481976 A CN202010481976 A CN 202010481976A CN 111580246 B CN111580246 B CN 111580246B
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CN111580246A (en
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伍雁雄
余苗
王丽萍
郭智元
张宏炫
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Foshan University
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Foshan University
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene

Abstract

The invention discloses a portable fundus camera optical system, which comprises a net film objective lens group and an imaging lens group, wherein the net film objective lens group and the imaging lens group are coaxially arranged from left to right in sequence; the imaging lens group comprises a seventh lens surface, an eighth lens surface, a ninth lens surface, a tenth lens surface, an eleventh lens surface, a twelfth lens surface, a thirteenth lens surface, a fourteenth lens surface, a fifteenth lens surface and a sixteenth lens surface which are sequentially arranged from left to right. The total length of the optical system of the fundus camera is less than or equal to 184mm, the whole design structure is simple, and the portable requirement is met. The invention is mainly applied to the technical field of optics.

Description

Portable eye ground camera optical system
Technical Field
The invention relates to the technical field of optics, in particular to a portable fundus camera optical system.
Background
The fundus camera is a medical instrument which illuminates the fundus oculi through an illumination system, and then images the fundus oculi onto a CCD or CMOS photosensitive chip through an imaging system to further acquire fundus oculi images. The fundus camera is used for checking whether tissues of the fundus, such as retina, optic disc, blood vessel distribution, etc., are abnormal, and is of great significance for diagnosis and prevention of ophthalmic diseases and blood vessel related diseases. To date, the design of fundus cameras has created two more sophisticated structures, internal and external illumination respectively. However, the existing fundus cameras are complex in optical structure and poor in portability.
Disclosure of Invention
It is an object of the present invention to provide a portable fundus camera optical system that solves one or more of the problems of the prior art, at least providing a useful alternative or creation.
The solution of the invention for solving the technical problem is as follows: the utility model provides a portable eye ground camera optical system, including nethike embrane objective lens group and imaging mirror group, nethike embrane objective lens group and imaging mirror group are from the setting of the coaxial axis in proper order from left to right. The omentum objective lens group comprises a first lens surface, a second lens surface, a third lens surface, a fourth lens surface, a fifth lens surface and a sixth lens surface which are arranged from left to right in sequence; the first lens surface is convex towards the right direction, and the curvature radius range of the first lens surface is greater than or equal to 707.15mm and less than or equal to 708.15 mm; the second lens surface is convex towards the right direction, and the curvature radius range of the second lens surface is greater than or equal to 38.97mm and less than or equal to 39.97 mm; the third lens surface and the second lens surface are arranged in a coplanar manner; the fourth lens surface is convex towards the right direction, and the curvature radius range of the fourth lens surface is greater than or equal to 49.48mm and less than or equal to 50.48 mm; the fifth lens surface is convex towards the left direction, and the curvature radius range of the fifth lens surface is greater than or equal to 44.52mm and less than or equal to 45.52 mm; the sixth lens surface is a plane.
The imaging lens group comprises a seventh lens surface, an eighth lens surface, a ninth lens surface, a tenth lens surface, an eleventh lens surface, a twelfth lens surface, a thirteenth lens surface, a fourteenth lens surface, a fifteenth lens surface and a sixteenth lens surface which are sequentially arranged from left to right; the seventh lens surface is convex towards the right direction, and the curvature radius range of the seventh lens surface is more than or equal to 28.04mm and less than or equal to 29.04 mm; the eighth lens surface is convex towards the right direction, and the curvature radius range of the eighth lens surface is greater than or equal to 6.32mm and less than or equal to 7.32 mm; the ninth lens surface and the eighth lens surface are arranged in a coplanar manner; the tenth lens surface is convex towards the right direction, and the curvature radius range of the tenth lens surface is greater than or equal to 17.78mm and less than or equal to 18.78 mm; the eleventh lens surface is convex towards the left direction, and the curvature radius range of the eleventh lens surface is more than or equal to 37.57mm and less than or equal to 38.57 mm; the twelfth lens surface is convex towards the right direction, and the curvature radius range of the twelfth lens surface is more than or equal to 11.45mm and less than or equal to 12.45 mm; the thirteenth lens surface and the twelfth lens surface are arranged in a coplanar manner; the fourteenth lens surface is convex towards the right direction, and the curvature radius range of the fourteenth lens surface is greater than or equal to 144.58mm and less than or equal to 145.58 mm; the fifteenth lens surface is convex towards the left direction, and the curvature radius range of the fifteenth lens surface is more than or equal to 11.62mm and less than or equal to 12.62 mm; the sixteenth lens surface is convex in the left direction, and has a radius of curvature of 9.38mm or more and 10.38mm or less.
Further, portable eye ground camera optical system still includes annular light source, annular light source sets up between omentum objective lens group and formation of image mirror group, annular light source's central point is located the main optical axis of omentum objective lens group and formation of image mirror group, annular light source is equipped with 2 mm's annular luminous belt.
Furthermore, the thickness range of the independent lens composed of the first lens surface and the second lens surface is [11.76mm,12.76mm ], the thickness range of the independent lens composed of the third lens surface and the fourth lens surface is [8.45mm,9.45mm ], and the thickness range of the independent lens composed of the fifth lens surface and the sixth lens surface is [14.11mm,15.11mm ].
Further, the thickness range of the independent lens composed of the seventh lens surface and the eighth lens surface is [5.5mm,6.5mm ], the thickness range of the independent lens composed of the ninth lens surface and the tenth lens surface is [5.48mm,6.48mm ], the thickness range of the independent lens composed of the eleventh lens surface and the twelfth lens surface is [5.5mm,6.5mm ], the thickness range of the independent lens composed of the thirteenth lens surface and the fourteenth lens surface is [4.5mm,5.5mm ], and the thickness range of the independent lens composed of the fifteenth lens surface and the sixteenth lens surface is [5.5mm,6.5mm ].
Further, the retinal objective lens group comprises 1 double cemented lens and 1 plano-convex lens.
Further, the imaging lens group comprises a front imaging lens group and a rear imaging lens group, the front imaging lens group is 1 double cemented lens, and the rear imaging lens group comprises 1 double cemented lens and 1 positive lens.
Furthermore, the glass material of the independent lens formed by the first lens surface and the second lens surface is H-LAK 2; the glass material of the independent lens formed by the third lens surface and the fourth lens surface is F2; the independent lens formed by the fifth lens surface and the sixth lens surface is made of H-LAK2 glass; the independent lens formed by the seventh lens surface and the eighth lens surface is made of H-LAK3 glass; the glass material of the independent lens formed by the ninth lens surface and the tenth lens surface is ZF 6; the glass material of the independent lens formed by the eleventh lens surface and the twelfth lens surface is H-LAK 3; the glass material of the independent lens formed by the thirteenth lens surface and the fourteenth lens surface is ZF 6; the independent lens composed of the fifteenth lens surface and the sixteenth lens surface is made of H-LAK 3.
The invention has the beneficial effects that: the portable fundus camera optical system comprises a retina objective lens group and an imaging lens group, the whole design structure is simple, the total length of the optical system is less than or equal to 188mm, the portable function of the fundus camera is better realized, and the practicability of the fundus camera is improved.
Drawings
In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures are only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from them without inventive effort.
FIG. 1 is a diagram of a portable fundus camera optical system of the present invention;
fig. 2 is a schematic diagram of a structure of a ring light source.
The arrow directions in fig. 1 are indicated as left and right.
Detailed Description
The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention. In addition, all the coupling/connection relationships mentioned herein do not mean that the components are directly connected, but mean that a better coupling structure can be formed by adding or reducing coupling accessories according to specific implementation conditions. All technical characteristics in the invention can be interactively combined on the premise of not conflicting with each other.
Fig. 1 is a portable fundus camera optical system according to an embodiment of the present invention, which is to add a fundus to be detected during operation to an object plane, and which is replaced with a human eye model 100 in this embodiment, and a cmos sensor 500 is provided on an image plane of the optical system for detecting information of an obtained image.
As shown in fig. 1, a portable fundus camera optical system includes a retinal objective lens group 200 and an imaging lens group 300, the retinal objective lens group 200 and the imaging lens group 300 are coaxially arranged in sequence from left to right, and the retinal objective lens group 200 includes a first lens surface 201, a second lens surface 202, a third lens surface 203, a fourth lens surface 204, a fifth lens surface 205 and a sixth lens surface 206 which are arranged in sequence from left to right; the first lens surface 201 is convex towards the right direction, and the curvature radius range is greater than or equal to 707.15mm and less than or equal to 708.15 mm; the second lens surface 202 is convex in the right direction, and has a curvature radius range of 38.97mm or more and 39.97mm or less; the third lens surface 203 and the second lens surface 202 are arranged in a coplanar manner; the fourth lens surface 204 is convex towards the right, and the curvature radius range is greater than or equal to 49.48mm and less than or equal to 50.48 mm; the fifth lens surface 205 is convex in the left direction, and has a curvature radius range of 44.52mm or more and 45.52mm or less; the sixth lens surface 206 is a plane.
The imaging lens group 300 comprises a seventh lens surface 307, an eighth lens surface 308, a ninth lens surface 309, a tenth lens surface 310, an eleventh lens surface 311, a twelfth lens surface 312, a thirteenth lens surface 313, a fourteenth lens surface 314, a fifteenth lens surface 315 and a sixteenth lens surface 316 which are arranged in sequence from left to right; the seventh lens surface 307 is convex in the right direction, and has a curvature radius range of 28.04mm or more and 29.04mm or less; the eighth lens surface 308 is convex in the right direction, and the curvature radius range thereof is greater than or equal to 6.32mm and less than or equal to 7.32 mm; the ninth lens surface 309 and the eighth lens surface 308 are arranged in a coplanar manner; the tenth lens surface 310 is convex in the right direction, and has a curvature radius range of 17.78mm or more and 18.78mm or less; the eleventh lens surface 311 is convex in the left direction, and has a curvature radius range of 37.57mm or more and 38.57mm or less; the twelfth lens surface 312 is convex in the right direction, and has a curvature radius range of 11.45mm or more and 12.45mm or less; the thirteenth lens surface 313 and the twelfth lens surface 312 are coplanar; the fourteenth lens surface 314 is convex in the right direction, and has a curvature radius range of 144.58mm or more and 145.58mm or less; the fifteenth lens surface 315 is convex in the left direction, and has a curvature radius range of 11.62mm or more and 12.62mm or less; the sixteenth lens surface 316 is convex in the left direction, and has a radius of curvature of 9.38mm or more and 10.38mm or less.
The thickness range of the independent lens formed by the first lens surface 201 and the second lens surface 202 is [11.76mm,12.76mm ], the thickness range of the independent lens formed by the third lens surface 203 and the fourth lens surface 204 is [8.45mm,9.45mm ], and the thickness range of the independent lens formed by the fifth lens surface 205 and the sixth lens surface 206 is [14.11mm,15.11mm ].
The thickness range of the independent lens formed by the seventh lens surface 2307 and the eighth lens surface 308 is [5.5mm,6.5mm ], the thickness range of the independent lens formed by the ninth lens surface 309 and the tenth lens surface 310 is [5.48mm,6.48mm ], the thickness range of the independent lens formed by the eleventh lens surface 311 and the twelfth lens surface 312 is [5.5mm,6.5mm ], the thickness range of the independent lens formed by the thirteenth lens surface 313 and the fourteenth lens surface 314 is [4.5mm,5.5mm ], and the thickness range of the independent lens formed by the fifteenth lens surface 315 and the sixteenth lens surface 316 is [5.5mm,6.5mm ].
Specifically, the omentum objective lens group comprises 1 double cemented lens and 1 plano-convex lens.
Specifically, the imaging lens group comprises a front imaging lens group and a rear imaging lens group, the front imaging lens group is 1 double cemented lens, and the rear imaging lens group comprises 1 double cemented lens and 1 positive lens.
For convenience of description, a lens formed by the first lens surface 201 and the second lens surface 202 is referred to as a first lens 210, a lens formed by the third lens surface 203 and the fourth lens surface 204 is referred to as a second lens 220, a lens formed by the fifth lens surface 205 and the sixth lens surface 206 is referred to as a third lens 230, a lens formed by the seventh lens surface 307 and the eighth lens surface 308 is referred to as a fourth lens 340, a lens formed by the ninth lens surface 309 and the tenth lens surface 310 is referred to as a fifth lens 350, a lens formed by the eleventh lens surface 311 and the twelfth lens surface 312 is referred to as a sixth lens 360, a lens formed by the thirteenth lens surface 313 and the fourteenth lens surface 314 is referred to as a seventh lens 370, and a lens formed by the fifteenth lens surface 315 and the sixteenth lens surface 316 is referred to as an eighth lens 380.
Control experiment one, in order to verify the present optical system, an optical system was constructed in which the radii of curvature of all the mirror surfaces of the retinal objective lens group and the imaging lens group are as shown in table 1 below:
TABLE 1
Lens surface Radius of curvature/(mm)
First lens surface 201 -708.15
Second lens face 202 -39.97
Third lens surface 203 -39.97
Fourth lens surface 204 -50.48
Fifth lens surface 205 45.52
Sixth lens surface 206 Infinite number of elements
Seventh lens surface 307 -29.04
Eighth lens surface 308 -7.32
Ninth lens surface 309 -7.32
Tenth lens surface 310 -18.78
Eleventh lens surface 311 37.57
Twelfth lens surface 312 -12.15
Thirteenth lens surface 313 -12.45
Fourteenth lens surface 314 -145.58
Fifteenth lens surface 315 11.62
Sixteenth lens surface 316 9.38
Here, it is assumed that the lens surface and the main optical axis create an intersection point, and if the center of sphere of the spherical surface on which the lens surface is located is to the left of the intersection point, the radius of curvature of the lens surface is negative, whereas if the center of sphere of the spherical surface on which the lens surface is located is to the right of the intersection point, the radius of curvature of the lens surface is positive.
The thickness and material comparison table for each lens element in the retinal objective lens group and the imaging lens group is shown in table 2 below: :
TABLE 2
Lens and lens assembly Thickness/(mm) Glass material
First lens 210 11.76mm H-LAK2
Second lens 220 8.45mm F2
Third lens 230 14.11mm H-LAK2
Fourth lens 340 5.5 H-LAK3
Fifth lens 350 5.48 ZF6
Sixth lens 360 5.5 H-LAK3
Seventh lens 370 4.5 ZF6
Eighth lens 380 5.5 H-LAK3
Tests conducted on the optical system of the above embodiment revealed that the MTF of the modulation transfer function of the imaging system was 0.25 at the Nyquist frequency of 901 p/mm. Meanwhile, the distance between the image plane of the optical system and the sixteenth lens plane 316 in this embodiment is 8.50 mm; the distance between the image plane of the optical system and the first lens surface 201 in this embodiment is 180 mm; the distance between the first lens surface 201 and the human eye model 100 is 40 mm.
In contrast, in order to verify the present optical system, the following optical system was constructed in which the radii of curvature of all the mirror surfaces of the retinal objective lens group and the imaging lens group are as shown in table 3 below:
TABLE 3
Figure BDA0002512794780000091
Figure BDA0002512794780000101
The thickness and material comparison table for each lens element in the retinal objective lens group and the imaging lens group is shown in the following table 4: :
TABLE 4
Figure BDA0002512794780000102
Figure BDA0002512794780000111
Here, when a light ray is incident on the lens surface, the lens surface and the main optical axis form an intersection point, and if the center of the sphere of the spherical surface on which the lens surface is located is on the left of the intersection point, the radius of curvature of the lens surface is negative, whereas if the center of the sphere of the spherical surface on which the lens surface is located is on the right of the intersection point, the radius of curvature of the lens surface is positive.
Tests conducted on the optical system of the above embodiment revealed that the MTF of the modulation transfer function of the imaging system was 0.35 when the Nyquist frequency was 901 p/mm. Meanwhile, the distance between the image plane of the optical system and the sixteenth lens plane 316 in this embodiment is 8.00 mm; the distance between the image plane of the optical system and the first lens surface 201 in this embodiment is 184 mm; the distance between the first lens surface 201 and the human eye model 100 is 40 mm.
In contrast, in order to verify the present optical system, the following optical system was constructed in which the radii of curvature of all the mirror surfaces of the retinal objective lens group and the imaging lens group are as shown in the following table 5: :
TABLE 5
Figure BDA0002512794780000112
Figure BDA0002512794780000121
The thickness and material comparison table for each lens element in the retinal objective lens group and the imaging lens group is shown in table 6 below: :
TABLE 6
Figure BDA0002512794780000122
Figure BDA0002512794780000131
Here, when a light ray is incident on the lens surface, the lens surface and the main optical axis form an intersection point, and if the center of the sphere of the spherical surface on which the lens surface is located is on the left of the intersection point, the radius of curvature of the lens surface is negative, whereas if the center of the sphere of the spherical surface on which the lens surface is located is on the right of the intersection point, the radius of curvature of the lens surface is positive.
Tests conducted on the optical system of the above embodiment revealed that the MTF of the modulation transfer function of the imaging system was 0.25 at the Nyquist frequency of 901 p/mm. Meanwhile, the distance between the image plane of the optical system and the sixteenth lens plane 316 in this embodiment is 7.50 mm; the distance between the image plane of the optical system and the first lens surface 201 in this embodiment is 188 mm; the distance between the first lens surface 201 and the human eye model 100 is 40 mm.
In summary, when the curvature radii of the first lens surface 201, the second lens surface 202, the third lens surface 203, the fourth lens surface 204, the fifth lens surface 205, the sixth lens surface 206, the seventh lens surface 307, the eighth lens surface 308, the ninth lens surface 309, the tenth lens surface 310, the eleventh lens surface 311, the twelfth lens surface 312, the thirteenth lens surface 313, the fourteenth lens surface 314, the fifteenth lens surface 315, and the sixteenth lens surface 316 adopt the value range of the present invention, when the nyquist frequency is 901p/mm, the MTF of the modulation transfer function of the imaging system is greater than or equal to 0.2, and the requirements of the fundus camera are satisfied. Meanwhile, the distance range between the image plane of the optical system of the fundus camera and the sixteenth lens surface 316 is [7.50mm,8.50mm ], and the distance between the image plane of the optical system of the fundus camera and the first lens surface 201 is 188mm or less. Therefore, the optical system of the fundus camera has a simple structure and a short total system length, and realizes the portable function of the fundus camera.
Referring to fig. 2, as some preferred embodiments, an annular light source 400 is disposed in the optical system, and the annular light source 400 is disposed between the retinal objective lens group 200 and the imaging lens group 300, and particularly between the sixth lens surface 206 and the seventh lens surface 307. The annular light source 400 is provided with an annular luminous band 410 with the diameter of 2mm, and the annular luminous band 410 is composed of eight LED lamp beads 420 which are annularly arranged. Wherein the central point of the ring-shaped light source 400 is located on the main optical axis (shown by the dotted line in fig. 1) of the retina objective lens group 200 and the imaging lens group 300. As shown in fig. 1, light emitted from the ring light source 400 enters the human eye model 100 through the retinal objective lens group 200 to illuminate the fundus of the human eye model 100, and reflected light from the illuminated fundus is projected onto the CMOS sensor 500 through the retinal objective lens group 200 and the imaging lens group 300. The annular light source 400 is arranged between the retina objective lens group 200 and the imaging objective lens group 300, so that the complexity of the design of the whole optical system is reduced, and the portability of the fundus camera is improved.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the invention and its scope is defined by the claims appended hereto.

Claims (5)

1. The utility model provides a portable eye ground camera optical system, includes that nethike embrane objective lens group and imaging mirror group, nethike embrane objective lens group and imaging mirror group from the left hand right side in proper order share the optical axis setting, its characterized in that:
the omentum objective lens group comprises a first lens surface, a second lens surface, a third lens surface, a fourth lens surface, a fifth lens surface and a sixth lens surface which are arranged from left to right in sequence; the first lens surface is convex towards the right direction, and the curvature radius range of the first lens surface is greater than or equal to 707.15mm and less than or equal to 708.15 mm; the second lens surface is convex towards the right direction, and the curvature radius range of the second lens surface is greater than or equal to 38.97mm and less than or equal to 39.97 mm; the third lens surface and the second lens surface are arranged in a coplanar manner; the fourth lens surface is convex towards the right direction, and the curvature radius range of the fourth lens surface is greater than or equal to 49.48mm and less than or equal to 50.48 mm; the fifth lens surface is convex towards the left direction, and the curvature radius range of the fifth lens surface is greater than or equal to 44.52mm and less than or equal to 45.52 mm; the sixth lens surface is a plane;
the imaging lens group comprises a seventh lens surface, an eighth lens surface, a ninth lens surface, a tenth lens surface, an eleventh lens surface, a twelfth lens surface, a thirteenth lens surface, a fourteenth lens surface, a fifteenth lens surface and a sixteenth lens surface which are sequentially arranged from left to right; the seventh lens surface is convex towards the right direction, and the curvature radius range of the seventh lens surface is more than or equal to 28.04mm and less than or equal to 29.04 mm; the eighth lens surface is convex towards the right direction, and the curvature radius range of the eighth lens surface is greater than or equal to 6.32mm and less than or equal to 7.32 mm; the ninth lens surface and the eighth lens surface are arranged in a coplanar manner; the tenth lens surface is convex towards the right direction, and the curvature radius range of the tenth lens surface is greater than or equal to 17.78mm and less than or equal to 18.78 mm; the eleventh lens surface is convex towards the left direction, and the curvature radius range of the eleventh lens surface is more than or equal to 37.57mm and less than or equal to 38.57 mm; the twelfth lens surface is convex towards the right direction, and the curvature radius range of the twelfth lens surface is more than or equal to 11.45mm and less than or equal to 12.45 mm; the thirteenth lens surface and the twelfth lens surface are arranged in a coplanar manner; the fourteenth lens surface is convex towards the right direction, and the curvature radius range of the fourteenth lens surface is greater than or equal to 144.58mm and less than or equal to 145.58 mm; the fifteenth lens surface is convex towards the left direction, and the curvature radius range of the fifteenth lens surface is more than or equal to 11.62mm and less than or equal to 12.62 mm; the sixteenth lens surface is convex towards the left direction, and the curvature radius range of the sixteenth lens surface is more than or equal to 9.38mm and less than or equal to 10.38 mm;
the omentum objective lens group comprises 1 double cemented lens and 1 plano-convex lens;
the imaging lens group comprises a front imaging lens group and a rear imaging lens group, the front imaging lens group is 1 double cemented lens, and the rear imaging lens group comprises 1 double cemented lens and 1 positive lens.
2. A portable fundus camera optical system according to claim 1, wherein: the portable fundus camera optical system further comprises an annular light source, the annular light source is arranged between the retina objective lens group and the imaging lens group, the central point of the annular light source is located on a main optical axis of the retina objective lens group and the imaging lens group, and the annular light source is provided with an annular luminous belt of 2 mm.
3. A portable fundus camera optical system according to claim 1, wherein: the thickness range of the independent lens formed by the first lens surface and the second lens surface is [11.76mm,12.76mm ], the thickness range of the independent lens formed by the third lens surface and the fourth lens surface is [8.45mm,9.45mm ], and the thickness range of the independent lens formed by the fifth lens surface and the sixth lens surface is [14.11mm,15.11mm ].
4. A portable fundus camera optical system according to claim 1, wherein: the thickness range of the independent lens composed of the seventh lens surface and the eighth lens surface is [5.5mm,6.5mm ], the thickness range of the independent lens composed of the ninth lens surface and the tenth lens surface is [5.48mm,6.48mm ], the thickness range of the independent lens composed of the eleventh lens surface and the twelfth lens surface is [5.5mm,6.5mm ], the thickness range of the independent lens composed of the thirteenth lens surface and the fourteenth lens surface is [4.5mm,5.5mm ], and the thickness range of the independent lens composed of the fifteenth lens surface and the sixteenth lens surface is [5.5mm,6.5mm ].
5. A portable fundus camera optical system according to claim 1, wherein: the glass material of the independent lens formed by the first lens surface and the second lens surface is H-LAK 2; the glass material of the independent lens formed by the third lens surface and the fourth lens surface is F2; the independent lens formed by the fifth lens surface and the sixth lens surface is made of H-LAK2 glass; the independent lens formed by the seventh lens surface and the eighth lens surface is made of H-LAK3 glass; the glass material of the independent lens formed by the ninth lens surface and the tenth lens surface is ZF 6; the glass material of the independent lens formed by the eleventh lens surface and the twelfth lens surface is H-LAK 3; the glass material of the independent lens formed by the thirteenth lens surface and the fourteenth lens surface is ZF 6; the independent lens composed of the fifteenth lens surface and the sixteenth lens surface is made of H-LAK 3.
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CN207851398U (en) * 2017-12-27 2018-09-11 江西联创电子有限公司 Pick-up lens

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