Fundus Camera Split Image Focusing and Gaze Fixation Integration
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Solution Overview
Problem
Conventional fundus cameras with LCD gaze fixation systems face challenges in manufacturing cost due to independent optical path systems and lack of split image focusing, making it difficult to quickly and precisely focus images for individual eye diopters, and the LCD system does not integrate with the optical path design for split image focusing.
Innovation Solution
A fundus examination device integrates gaze fixation and split image focusing means into a focusing zone, with gaze-fixation images and a split image screen located at different focal positions corresponding to the eye curvature, using a light projecting device, illuminating system, and focusing and gaze-fixation device with a focus mask, light-penetrable structure, and gaze fixation devices to provide clear focal positions and high contrast for comfortable fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an LCD gaze fixation system is used, then gaze fixation is provided, but the manufacturing cost increases due to independent optical path systems
Solution Approach 1:
The patent combines the gaze fixation function and split image focusing function into a single integrated optical path system. The semi-lens displays both the gaze fixation image and the split image on the same display surface, eliminating the need for separate independent optical path systems. This merging reduces device complexity and manufacturing cost while maintaining both functions.
2Ease of operation
If an LCD gaze fixation system is used, then gaze fixation is provided, but split image focusing cannot be performed
Solution Approach 1:
The patent makes the optical path system universal by enabling it to perform multiple functions: gaze fixation and split image focusing. The semi-lens is designed to display both types of images simultaneously, and the optical path can switch between or combine these functions as needed, making the system adaptable to different examination requirements.
3Device complexity
If gaze fixation images and split image screen are at the same focal position, then focusing is simplified, but the examinee cannot clearly see both images simultaneously
Solution Approach 1:
The patent resolves the focal position conflict by using different spatial dimensions. The semi-lens displays the gaze fixation image and split image at different positions on the display surface, while both remain within the same focal range. This dimensional arrangement on the semi-lens surface allows the examinee to clearly see both images simultaneously without requiring different focal positions.
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
Enables convenient focusing on the fundus, allows split image focusing adjustment according to individual eye diopter, and independently controls gaze fixation targets for improved examination efficiency and comfort by using invisible light and intermittently lightened images.
Implementation Method 1
a semi-lens 141, a relay lens 142
Implementation Method 2
a focusing lens 122
Implementation Method 3
a focusing lens 122
Data Source
AI summary
A fundus examination device aiding in gaze fixation and image focusing includes a light projecting device for projecting an examination light to illuminate an examinee's fundus; an illuminating system for transmitting the examination light to the examinee's eye and receiving a fundus image; an imaging system for showing the fundus image; and a focusing and gaze-fixation device located in the illuminating system and including a focus mask formed in a focusing zone, on which the examinee's eye focuses. The focus mask includes a split image screen surrounded by a light-penetrable structure, and gaze fixation devices for forming gaze-fixation images at examinee's eye focusing positions within the focusing zone, such that the split image screen and the gaze-fixation images are located at different focal positions corresponding to the examinee's eye curvature. Therefore, when a split image focusing is completed, the gaze-fixation images are also located at clearly recognizable focal positions.