Illumination system of ghost elimination eye fundus camera

Abstract

The invention discloses an illumination system of ghost elimination eye fundus camera, which comprises the following steps of: sequentially comprising a beam splitter, a collimating lens, a light collecting system, a field-of-view optical waveguide, a polarization beam splitter, a reflecting mirror, a field mirror, a first polarizing beam splitter and a receiving objective lens from object space to image space, a first light source is arranged on the left side of the beam splitter, and a second light source is arranged on the upper side of the beam splitter; the light emitted by the first light source and the second light source sequentially passes through the beam splitter, the collimating lens and the light collecting system to form primary image on the field-of-view optical waveguide, then the light sequentially passes through the polarization beam splitter, the reflecting mirror, the field mirror, the first polarizing beam splitter and the receiving objective lens to form a field-of-view-optical waveguide-like spot is formed in the eye pupil or crystalline lens. Compared with the lighting system in prior art, the illumination system of ghost elimination eye fundus camera has the advantages of simpler structure, more uniform illumination and better effect of eliminating ghost.

Description

【Technical field】 [0001] The invention relates to a lighting system for a fundus camera for eliminating ghost shadows. 【Background technique】 [0002] Since the fundus itself does not emit light, and the diameter of the pupil generally does not exceed 3mm during the day, it is required that the light from the lighting equipment and the light from the imaging equipment pass through such a small aperture at the same time to achieve uniform illumination and imaging without ghosting. Traditional ring lighting requires The illumination source is a ring or an array surface light source plus a ring diaphragm or directly adopts the optical fiber external lighting and the imaging system does not share the lens. If the two overlap, it is easy to produce lens ghosts, which will lead to small imaging pupils, low light efficiency or uneven illumination. Traditional lighting does not use polarizers to eliminate corneal ghosts, but uses small angles. Imaging the light source on the cornea...

AI Technical Summary

Problems solved by technology

[0002] Since the fundus itself does not emit light, and the diameter of the pupil generally does not exceed 3mm during the day, it is required that the light from the lighting equipment and the light from the imaging equipment pass through such a small aperture at the same time to achieve uniform illumination and imaging without ghosting. Traditional ring lighting requires The illumination source is a ring or an array surface light source plus a ring diaphragm or directly adopts the optical fiber external lighting and the imaging system does not share the lens. If the two overlap, it is easy to produce lens ghosts, which will lead to small imaging pupils, low light efficiency or uneven illumination. Traditional lighting does not use polarizers to eliminate corneal ghosts, but uses small angles. Imaging the light source on the cornea can solve corneal ghosting, but lens ghosting cannot be solved. If the irradiation angle is increased to more than 45°, this method will inevitably produce corneal ghosting or lens ghosting. The optical fiber external illumination is not compatible with imaging The shared len

Images