Retina imaging optical system with high resolution and coaxial illumination

Abstract

The invention discloses a retina imaging optical system with high resolution and coaxial illumination, comprising a first lens group, a second lens group, a third lens group and a photosensitive chip, wherein the first lens group, the second lens group, the third lens group and the photosensitive chip are sequentially arranged from an objective direction to a lens direction by a common optical shaft; a diaphragm is arranged between the second lens group and the third lens group; and a semitransparent reflective mirror, which is used for transmitting part of rays and reflecting part of rays and forms an angle of 45 degrees with the optical shaft, is arranged between a first lens and a second lens in the first lens group, close to the objective direction. An illumination light path is arranged aside an imaging optical shaft, wherein the rays are reflected into the reflective mirror through a 45-degree reflective mirror surface. The invention provides the optical system with the characteristics of high resolution, large drawing angles, automatic focusing, convenient movement and coaxial illumination.

Description

【Technical field】 [0001] The invention relates to an optical system, which is a new type of optical system for photographing the fundus in medical examination. The optical system is composed of multiple lenses, prisms, reflectors, photosensitive chips and light sources. 【Background technique】 [0002] At present, most fundus examinations are performed by doctors directly observing and examining patients' eyes with the naked eye through traditional ophthalmoscopes. There is no objective comparison effect, and it is difficult to carry out data archiving and management. [0003] The traditional ophthalmoscope adopts non-coaxial illumination, and the illumination light path and the observation light path have a deflection angle, which leads to poor illumination uniformity and small observation angle, and the general observation angle is about 30 degrees. When the pupil is used in a state with a large pupil, the patient is often required to dilate the pupil for examination. [0...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the fundus examinations are performed by doctors directly observing and examining the patient's eyes with the naked eye through the traditional ophthalmoscope, which has no objective contrast effect, and it is difficult to carry out data archiving and management

[0003] The traditional ophthalmoscope adopts non-coaxial illumination, and the illumination light path and the observation light path have a deflection angle, which leads to poor illumination uniformity and small observation angle, and the general observation angle is about 30 degrees. When used in the state of large pupils, patients are often required to dilate the pupils before examination

[0004] Traditional ophthalmoscopes use 10-20pcs lenses to adjust the focal length in segments for different eyeball sizes and diopters. It is inconvenient to manually turn the dial to switch between different magnifying glasses to adjust the focal length

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