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Large-view-field catadioptric fundus camera optic system

An optical system, catadioptric technology, applied in the optical system field of large field of view catadioptric fundus cameras, can solve the problems of difficult manufacturing and assembly of off-axis retinal objective lens without diopter compensation, small imaging field of view, complex structure, etc. , to reduce the difficulty of processing and manufacturing, reduce the difficulty of assembly and adjustment, and solve the effect of large field of view

Inactive Publication Date: 2012-08-22
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the technical problems existing in the prior art, including the stray light of the total refraction system, the small imaging field of view of the all-trans system, the complex structure, no diopter compensation, and the difficulty in manufacturing and assembling the off-axis retinal objective lens, etc., now Provide a large field of view catadioptric fundus camera optical system

Method used

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  • Large-view-field catadioptric fundus camera optic system

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specific Embodiment approach 1

[0015] to combine figure 1 To describe this embodiment, figure 1 It is a schematic diagram of the optical principle of a large field of view catadioptric fundus camera optical system of the present invention, including an optical model 1 of the human eye, a clear aperture 2, a reflective retinal objective lens primary mirror 3, and a reflective retinal objective lens secondary Mirror 4, hollow reflector 5 (the hollow part is also the aperture diaphragm of the imaging system), refractive illumination relay mirror group 6, illumination diaphragm 7, refractive illumination condenser lens group 8, light source 9, refractive focusing lens group 10. A refraction focusing imaging group 11 and a camera 12. The present invention adopts coaxial illumination, the illumination light path A and the imaging light path B share the clear aperture 2 of the omentum objective lens, the main mirror 3 of the reflection type omentum objective lens and the secondary mirror 4 of the reflection type ...

specific Embodiment approach 2

[0020] to combine figure 2 , image 3 and Figure 4 Description of this embodiment

[0021] figure 2 It is the optical structure diagram of the used omentum objective lens of the present embodiment, figure 2 The retinal objective in the image 3 light path and Figure 4 The common part of the imaging light path, the pupil 1-1 (object side), the clear aperture 2, the reflective omentum objective primary mirror 3 and the reflective omentum objective secondary mirror 4, and the hollow mirror 5 (image side) are on the same optical axis (folded optical axis) placed sequentially. Its magnification is 1.5, the pupil (object space) 1-1 is 6mm, the image space 5 is 9mm, and the front working distance is 48mm.

[0022] The structural parameters of reflective omentum objective lens main mirror, reflective omentum objective lens secondary mirror and hollow reflector are provided below in the present embodiment:

[0023] Table 1

[0024]

[0025] Table 2

[0026]

[0027...

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Abstract

A large-view-field catadioptric fundus camera optic system belongs to the field of medical optical instruments and aims at resolving technical problems in the prior art that a total refraction system is stray in light, and a total catadioptric system is small in imaging view field, complex in structure, free of diopter compensation, difficult in manufacturing off-axial retina objective lenses and the like. The large-view-field catadioptric fundus camera optic system comprises two parts including an imaging light path and an illumination light path, wherein the imaging light path and the illumination light path share a reflection type retina objective lens primary lens, a reflection type retina objective lens secondary lens and a hollow reflection lens. The large-view-field catadioptric fundus camera optic system further comprises a refraction type illumination relay lens group, an illumination diaphragm, a refraction illumination collecting lens group, a light source, a refraction focusing lens group, a refraction type focus imaging lens group and a camera, wherein the refraction type imaging lens group adopts a free-form surface to rectify residual off-axial aberration of a reflection type retina objective lens. Therefore, a fundus imaging system is guaranteed to meet imaging requirements in the area of 45-degree view field, and performance of the refraction fundus camera optical system is improved.

Description

technical field [0001] The invention relates to an optical system of a catadioptric fundus camera with a large field of view, belonging to the field of medical optical instruments. Background technique [0002] A fundus camera is a traditional medical device used to observe and record retinal images of the human eye. Although the purpose of the fundus camera is to image the retina, its lighting path is more complicated. The stray light and ghost images introduced by the lighting path are the main factors that affect its imaging quality and are also the design difficulties. [0003] The stray light mainly comes from the reflection of the illumination light by the eyeball optical system and the transmissive retinal objective lens, and the stray light of other parts is not considered in the design. Usually, the intermediate reflected light of the optical structure of the eyeball is eliminated by means of pupil separation, that is, ring illumination is used. The traditional so...

Claims

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Application Information

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IPC IPC(8): A61B3/12A61B3/15G02B17/06
Inventor 孙强李灿李淳刘英
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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