CN211796406U - Portable fundus imaging device - Google Patents
Portable fundus imaging device Download PDFInfo
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- CN211796406U CN211796406U CN202020105075.7U CN202020105075U CN211796406U CN 211796406 U CN211796406 U CN 211796406U CN 202020105075 U CN202020105075 U CN 202020105075U CN 211796406 U CN211796406 U CN 211796406U
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Abstract
The utility model relates to a portable eye ground imaging device, be in including lens cone and setting lens group in the lens cone, the lens group includes leading objective, first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens and the ninth lens that sets gradually along the optical axis direction by the object space to the image space, and wherein, fifth lens, sixth lens and seventh lens are the veneer lens. The utility model discloses an overcome current eye ground camera and had bulky, inconvenient shortcoming of taking and the definition is low, it is through leading thing mirror and nine lens collocation to cooperate its lens preference coefficient, have the advantage that the portability is good and the definition is high.
Description
Technical Field
The utility model relates to a portable eye ground imaging device uses in optical imaging device production field.
Background
The eyeground is the only internal physiological tissue of the human body which can be directly observed in a non-invasive way, and various eye diseases and systemic diseases can be accurately judged by examining the eyeground. At present, a doctor mainly uses a fundus camera to perform fundus examination on a patient, but the shooting definition of the existing fundus camera is low, so that fundus focus cannot be accurately and thoroughly observed by the doctor, and misdiagnosis is caused. High-definition imaging of the fundus can assist a doctor in qualitative and quantitative analysis of fundus lesions so as to solve the problem of misdiagnosis caused by low definition. Conventionally, "low portability", "difficult radiographing" and "difficult radiographing" are three major pain points in primary fundus screening work. Among them, "not portable" is because the traditional desk-top eye ground camera is big in size, difficult to carry, can't satisfy the needs of the primary doctor going out a home visit. Therefore, it is desirable to provide a portable fundus imaging apparatus having a simple structure, good portability, and high resolution.
SUMMERY OF THE UTILITY MODEL
In order to overcome the shortcoming that current eye ground camera exists bulky, inconvenient taking and the definition is low, the utility model provides a portable eye ground imaging device, it is through leading objective and nine lens collocation to cooperate its lens preference coefficient, have that the portability is good and the advantage that the definition is high.
The technical scheme of the utility model as follows:
a portable fundus imaging device comprises a lens barrel and a lens group arranged in the lens barrel, wherein the lens group comprises a front objective lens, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens which are sequentially arranged from an object space to an image space along an optical axis direction, wherein the fifth lens, the sixth lens and the seventh lens are cemented lenses;
and each lens satisfies the following optical conditions:
1.6< n <1.7, 50< v <60, radius of curvature: 400-500 of S1 surface, 20-30 of S2 surface, 10-11MM of center thickness, 30-40 of focal length and 15-20 of radius of light-passing hole;
1.8< n1<2.0, 10< v1<20, radius of curvature: 20-40 parts of S1 surface, 80-100 parts of S2 surface, 2-3MM of center thickness, 80-100 parts of focal length and 15-20 parts of radius of a light through hole;
1.9< n2<2.1, 15< v2<30, radius of curvature: 10-20 parts of S1 surface, 5-10 parts of S2 surface, 1-2MM of center thickness, 50-70 parts of focal length and 10-12 parts of radius of a light through hole;
1.6< n3<1.7, 40< v3<60, radius of curvature: 5-10 of S1 surface, 20-30 of S2 surface, 4-6MM of center thickness, 50-60 of focal length and 8-10 of radius of light through hole;
1.9< n4<2.1,10< v4<30, radius of curvature: s1 plane-20 to 30, S2 plane-20 to 30, center thickness 0.5 to 2MM, focal length 70 to 90, and radius of the light-passing hole 8 to 10;
1.4< n5<1.6,60< v5<90, radius of curvature: 20-40 parts of S1 surface, 80-100 parts of S2 surface, 2-3MM of center thickness, 10-20 parts of focal length and 5-6 parts of radius of a light through hole;
1.82< n6<2,20< v6<30, radius of curvature: 5-20 of S1 surface, 80-105 of S2 surface, 2-3MM of center thickness, 5-10 of focal length and 4-5 of radius of light through hole;
1.84< n7<1.9,20< v7<30, radius of curvature: 10-20 of S1 surface, 8-10 of S2 surface, 0.5-2MM of center thickness, 10-20 of focal length and 3-4 of radius of a light through hole;
1.75< n8<1.85,30< v8<45, radius of curvature: 8-10 of S1 surface, 8-10 of S2 surface, 0.5-1MM of center thickness, 20-30 of focal length and 3-4 of radius of light through hole;
1.6< n9<1.85,50< v8<60, radius of curvature: 8-10 parts of S1 surface, 10-20 parts of S2 surface, 6-8MM of center thickness, 20-30 parts of focal length and 3-4 parts of radius of a light through hole;
wherein n, n1-n12 are refractive indexes of the front objective lens and the first to twelfth lenses, respectively, and v, v1-v12 are abbe numbers of the front objective lens and the first to twelfth lenses, respectively;
the air space between the front objective lens and the first lens is 68-75mm, the air space between the first lens and the second lens is 45-55mm, the air space between the second lens and the third lens is 9-11mm, the air space between the third lens and the fourth lens is 1-2mm, the air space between the fourth lens and the fifth lens is 14-20mm, the air space between the seventh lens and the eighth lens is 0.05-0.2mm, and the air space between the eighth lens and the ninth lens is 1-2 mm; the combined focal length of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens is-5-10 mm.
The portable fundus imaging device adopts a group of nine-piece lens structure, a front objective lens is introduced into the front end of the portable fundus imaging device, and parameters of the preferable lens are matched to improve imaging resolution, so that the MTF value of the central view field of the imaging device is greater than 0.5 at a position 110lp/mm, the MTF value of the edge view field is greater than 0.2 at a position 110lp/mm, the imaging target surface reaches 8.8mm, distortion is less than 5%, the F number is less than 2.6, and the relative illumination is greater than 60%. The radius parameter of the light through hole selected by each lens is optimized, the optical total length is less than 230mm, and the lens is convenient to carry.
The front objective lens is a biconvex lens, the first lens is a meniscus lens, the second lens is a meniscus lens, the third lens is a biconvex lens, the fourth lens is a meniscus lens, the fifth lens is a biconvex lens, the sixth lens is a biconcave lens, the seventh lens is a biconvex lens, the eighth lens is a meniscus lens, and the ninth lens is a meniscus lens.
The front lens and other lenses with the optimal shapes enable the imaging resolution of the portable fundus imaging device to be further improved.
Compared with the prior art, the utility model discloses the application has following advantage:
1) the portable fundus imaging device adopts the structure of a front objective and a nine-piece lens, and is matched with various parameters of the optimized lens, so that the MTF value of the central view field of the imaging device is greater than 0.5 at the 110lp/mm position, the MTF value of the edge view field is greater than 0.2 at the 110lp/mm position, the imaging target surface reaches 8.8mm, the distortion is less than 5%, the F number is less than 2.6, the relative illumination is greater than 60%, the total optical length is less than 230mm, the definition is high, and the portable fundus imaging device is convenient to carry;
2) the preferable front lens and other lens shapes can further improve the imaging resolution of the imaging device.
Drawings
Fig. 1 is a schematic view of a lens structure of a portable fundus imaging apparatus according to the present invention;
fig. 2 is an MTF diagram of the portable fundus imaging apparatus of the present invention;
FIG. 3 is a light fan diagram of the portable fundus imaging apparatus of the present invention;
fig. 4 is a distortion diagram of the portable fundus imaging apparatus of the present invention;
fig. 5 is a speckle pattern of the portable fundus imaging apparatus of the present invention.
Description of reference numerals:
the lens comprises a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9 and a front objective lens 10.
Detailed Description
The technical solution of the present invention will be described in detail with reference to the accompanying drawings 1-5 of the specification.
As shown in fig. 1-5, the portable fundus imaging device of the present invention comprises a lens barrel and a lens set disposed in the lens barrel, wherein the lens set comprises a front lens 10, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8 and a ninth lens 9, which are sequentially disposed from an object space to an image space along an optical axis direction, wherein the fifth lens 5, the sixth lens 6 and the seventh lens 7 are cemented lenses;
and each lens satisfies the following optical conditions:
1.6< n <1.7, 50< v <60, radius of curvature: 400-500 of S1 surface, 20-30 of S2 surface, 10-11MM of center thickness, 30-40 of focal length and 15-20 of radius of light-passing hole;
1.8< n1<2.0, 10< v1<20, radius of curvature: 20-40 parts of S1 surface, 80-100 parts of S2 surface, 2-3MM of center thickness, 80-100 parts of focal length and 15-20 parts of radius of a light through hole;
1.9< n2<2.1, 15< v2<30, radius of curvature: 10-20 parts of S1 surface, 5-10 parts of S2 surface, 1-2MM of center thickness, 50-70 parts of focal length and 10-12 parts of radius of a light through hole;
1.6< n3<1.7, 40< v3<60, radius of curvature: 5-10 of S1 surface, 20-30 of S2 surface, 4-6MM of center thickness, 50-60 of focal length and 8-10 of radius of light through hole;
1.9< n4<2.1,10< v4<30, radius of curvature: s1 plane-20 to 30, S2 plane-20 to 30, center thickness 0.5 to 2MM, focal length 70 to 90, and radius of the light-passing hole 8 to 10;
1.4< n5<1.6,60< v5<90, radius of curvature: 20-40 parts of S1 surface, 80-100 parts of S2 surface, 2-3MM of center thickness, 10-20 parts of focal length and 5-6 parts of radius of a light through hole;
1.82< n6<2,20< v6<30, radius of curvature: 5-20 of S1 surface, 80-105 of S2 surface, 2-3MM of center thickness, 5-10 of focal length and 4-5 of radius of light through hole;
1.84< n7<1.9,20< v7<30, radius of curvature: 10-20 of S1 surface, 8-10 of S2 surface, 0.5-2MM of center thickness, 10-20 of focal length and 3-4 of radius of a light through hole;
1.75< n8<1.85,30< v8<45, radius of curvature: 8-10 of S1 surface, 8-10 of S2 surface, 0.5-1MM of center thickness, 20-30 of focal length and 3-4 of radius of light through hole;
1.6< n9<1.85,50< v8<60, radius of curvature: 8-10 parts of S1 surface, 10-20 parts of S2 surface, 6-8MM of center thickness, 20-30 parts of focal length and 3-4 parts of radius of a light through hole;
wherein n, n1-n12 are refractive indexes of the front objective lens and the first to twelfth lenses, respectively, and v, v1-v12 are abbe numbers of the front objective lens and the first to twelfth lenses, respectively;
the air space between the front objective lens 10 and the first lens 1 is 68-75mm, the air space between the first lens 1 and the second lens 2 is 45-55mm, the air space between the second lens 2 and the third lens 3 is 9-11mm, the air space between the third lens 3 and the fourth lens 4 is 1-2mm, the air space between the fourth lens 4 and the fifth lens 5 is 14-20mm, the air space between the seventh lens 7 and the eighth lens 8 is 0.05-0.2mm, and the air space between the eighth lens 8 and the ninth lens 9 is 1-2 mm; the combined focal length of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8 and the ninth lens 9 is-5-10 mm.
The front objective lens 10 is a biconvex lens, the first lens 1 is a meniscus lens, the second lens 2 is a meniscus lens, the third lens 3 is a biconvex lens, the fourth lens 4 is a meniscus lens, the fifth lens 5 is a biconvex lens, the sixth lens 6 is a biconcave lens, the seventh lens 7 is a biconvex lens, the eighth lens 8 is a meniscus lens, and the ninth lens 9 is a meniscus lens.
Description with respect to figures 2-5:
in fig. 2, the central MTF of the portable fundus imaging device of the utility model is more than 0.5 at 160lp/mm, and the edge MTF is more than 0.2 at 100 lp/mm; the MTF is a standard for measuring the imaging quality of the lens, the higher the frequency is, the better the resolving power is, and the central MTF 160lp/mm of the existing fundus device is generally more than 0.3 and less than 0.5.
In fig. 3 the utility model discloses portable fundus imaging device's aberration curve is level and smooth, and the curve is close to the X axle, and the aberration is little, the image quality is good (the explanation system aberration that light fan picture can be fine, the curve is gentler, is close to the X axle more, and the aberration is less).
Fig. 4 shows that the distortion of the portable fundus imaging apparatus of the present invention is small, and the distortion cannot be seen by naked eyes (the curvature of field is small, and the edge is also optimal when the center is focused optimally).
Fig. 5 shows that the portable fundus imaging device of the utility model has small circle of dispersion and well matches with chip imaging (the radius of the circle of dispersion is smaller than that of the chip pixel, namely the device can achieve the best imaging effect of the chip).
The portable fundus imaging device of the utility model is not only limited to the above-mentioned embodiments, all are the basis the utility model discloses any improvement or replacement of principle all should be within the protection scope.
Claims (2)
1. A portable fundus imaging apparatus characterized in that: the device comprises a lens barrel and a lens group arranged in the lens barrel, wherein the lens group comprises a front objective lens (10), a first lens (1), a second lens (2), a third lens (3), a fourth lens (4), a fifth lens (5), a sixth lens (6), a seventh lens (7), an eighth lens (8) and a ninth lens (9) which are sequentially arranged from an object space to an image space along the direction of an optical axis, wherein the fifth lens (5), the sixth lens (6) and the seventh lens (7) are cemented lenses;
and each lens satisfies the following optical conditions:
1.6< n <1.7, 50< v <60, radius of curvature: 400-500 of S1 surface, 20-30 of S2 surface, 10-11MM of center thickness, 30-40 of focal length and 15-20 of radius of light-passing hole;
1.8< n1<2.0, 10< v1<20, radius of curvature: 20-40 parts of S1 surface, 80-100 parts of S2 surface, 2-3MM of center thickness, 80-100 parts of focal length and 15-20 parts of radius of a light through hole;
1.9< n2<2.1, 15< v2<30, radius of curvature: 10-20 parts of S1 surface, 5-10 parts of S2 surface, 1-2MM of center thickness, 50-70 parts of focal length and 10-12 parts of radius of a light through hole;
1.6< n3<1.7, 40< v3<60, radius of curvature: 5-10 of S1 surface, 20-30 of S2 surface, 4-6MM of center thickness, 50-60 of focal length and 8-10 of radius of light through hole;
1.9< n4<2.1,10< v4<30, radius of curvature: s1 plane-20 to 30, S2 plane-20 to 30, center thickness 0.5 to 2MM, focal length 70 to 90, and radius of the light-passing hole 8 to 10;
1.4< n5<1.6,60< v5<90, radius of curvature: 20-40 parts of S1 surface, 80-100 parts of S2 surface, 2-3MM of center thickness, 10-20 parts of focal length and 5-6 parts of radius of a light through hole;
1.82< n6<2,20< v6<30, radius of curvature: 5-20 of S1 surface, 80-105 of S2 surface, 2-3MM of center thickness, 5-10 of focal length and 4-5 of radius of light through hole;
1.84< n7<1.9,20< v7<30, radius of curvature: 10-20 of S1 surface, 8-10 of S2 surface, 0.5-2MM of center thickness, 10-20 of focal length and 3-4 of radius of a light through hole;
1.75< n8<1.85,30< v8<45, radius of curvature: 8-10 of S1 surface, 8-10 of S2 surface, 0.5-1MM of center thickness, 20-30 of focal length and 3-4 of radius of light through hole;
1.6< n9<1.85,50< v8<60, radius of curvature: 8-10 parts of S1 surface, 10-20 parts of S2 surface, 6-8MM of center thickness, 20-30 parts of focal length and 3-4 parts of radius of a light through hole;
wherein n, n1-n12 are refractive indexes of the front objective lens (10) and the first lens (1) to the twelfth lens (12), respectively, and v, v1-v12 are abbe coefficients of the front objective lens (10) and the first lens (1) to the twelfth lens (12), respectively;
the air space between the front objective lens (10) and the first lens (1) is 68-75mm, the air space between the first lens (1) and the second lens (2) is 45-55mm, the air space between the second lens (2) and the third lens (3) is 9-11mm, the air space between the third lens (3) and the fourth lens (4) is 1-2mm, the air space between the fourth lens (4) and the fifth lens (5) is 14-20mm, the air space between the seventh lens (7) and the eighth lens (8) is 0.05-0.2mm, and the air space between the eighth lens (8) and the ninth lens (9) is 1-2 mm; the combined focal length of the first lens (1), the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5), the sixth lens (6), the seventh lens (7), the eighth lens (8) and the ninth lens (9) is-5-10 mm.
2. The portable fundus imaging apparatus of claim 1, wherein: the front objective lens (10) is a biconvex lens, the first lens (1) is a meniscus lens, the second lens (2) is a meniscus lens, the third lens (3) is a biconvex lens, the fourth lens (4) is a meniscus lens, the fifth lens (5) is a biconvex lens, the sixth lens (6) is a biconcave lens, the seventh lens (7) is a biconvex lens, the eighth lens (8) is a meniscus lens, and the ninth lens (9) is a meniscus lens.
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| CN202020105075.7U CN211796406U (en) | 2020-01-17 | 2020-01-17 | Portable fundus imaging device |
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| CN202020105075.7U CN211796406U (en) | 2020-01-17 | 2020-01-17 | Portable fundus imaging device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114732353A (en) * | 2022-06-13 | 2022-07-12 | 南京览视医疗科技有限公司 | High-resolution fundus optical imaging system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114732353A (en) * | 2022-06-13 | 2022-07-12 | 南京览视医疗科技有限公司 | High-resolution fundus optical imaging system |
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