Curved Reflector Fundus Imaging System Ghost Image Elimination
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Solution Overview
Problem
Current fundus cameras suffer from ghost images due to lens module reflections and have limited imaging fields, which hinder high-quality imaging and disease detection.
Innovation Solution
An ultra-wide field fundus imaging system utilizing a photosource, optical splitter, scanning mirrors, and a curved reflector for total reflection, allowing light to enter the fundus at larger angles, avoiding ghost images and enabling wide field imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lens module is used for fundus imaging, then the imaging function is achieved, but ghost images are formed due to light reflection affecting imaging quality
Solution Approach 1:
The patent removes the lens module from the optical path and replaces it with a curved reflector that uses total internal reflection. This extraction of the problematic lens element eliminates the ghost image formation while maintaining the imaging function through the curved reflector's reflective surface.
Solution Approach 2:
The patent substitutes the refractive lens system with a reflective curved mirror system. By replacing the lens-based optical path with a mirror-based total internal reflection path, the system eliminates chromatic aberration and ghost images while achieving wide-field imaging capability.
2Adaptability or versatility
If a lens module is used for fundus imaging, then imaging is achieved, but the imaging field is small and cannot satisfy wide field imaging demand
Solution Approach 1:
The patent employs a curved reflector with a specific radius of curvature to expand the imaging field. The curved surface geometry allows light rays from different angles to be reflected onto the sensor, achieving wide-field imaging while the total internal reflection mechanism maintains optical quality without ghost images.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively prevents ghost images and achieves high-quality, wide field imaging, enhancing disease detection capabilities by allowing 100° to 180° fundus perspective imaging.
Implementation Method 1
an ultra wide field fundus imaging system utilizes a photosource, an optical splitter, a scanning assembly, a probe pinhole and an imaging assembly; the scanning assembly includes a first scanning mirror scanning along a first direction and a second scanning mirror scanning along a second direction; wherein the ultra wide field fundus imaging system further comprises a curved reflector arranged opposite to the scanning assembly; the light emitted by the photosource passes through the optical splitter, then successively is reflected by the first scanning mirror, the curved reflector, the second scanning mirror and the curved reflector, and then enters in the fundus
Data Source
AI summary
An ultra wide field fundus imaging system comprises a photosource, an optical splitter, a scanning assembly, a curved reflector, a probe pinhole and an imaging assembly. The scanning assembly includes a first scanning mirror scanning along a first direction and a second scanning mirror scanning along a second direction. The light emitted by the photosource passes through the optical splitter, then successively is reflected by the first scanning mirror, the curved reflector, the second scanning mirror and the curved reflector, and then enters in the fundus; the light entering the fundus is reflected by the retina and then successively is reflected by the curved reflector, the second scanning mirror, the curved reflector, the first scanning mirror and then returned to the optical splitter; the light is reflected by the optical splitter and passes through the probe pinhole, finally the light enters in the imaging assembly. Compared with the prior art, the ultra wide field fundus imaging system realizes fundus imaging by total reflection and can effectively avoid ghost images caused by lens module imaging to improve the imaging quality. Since the curvature of the curved reflector is gradually changed, so the light reflected by the curved reflector can enter in the fundus at a larger incident angle to achieve wide field imaging.