Fundus Camera Alignment Modes for Opaque Media Imaging
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Solution Overview
Problem
Current fundus photographing apparatuses face challenges in capturing clear images of the fundus when there is opacity in the optic media, as existing techniques require complex configurations or alignment adjustments that can lead to flare and reduced image quality.
Innovation Solution
A fundus photographing apparatus with a front photographing optical system that scans the fundus with illuminating light to acquire a two-dimensional reflection image, a driver to adjust the positional relation between the apparatus and the eye, and a processor to switch between alignment modes to minimize the impact of opacity, allowing for effective alignment and image capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If alignment adjustment is performed to avoid opacity, then the fundus image quality is improved, but the device complexity and operation complexity increase
Solution Approach 1:
The patent implements dynamic alignment adjustment by allowing the photographing unit to move relative to the examinee's eye in multiple directions (first direction along scanning path, second direction crossing the scanning path). The processor dynamically controls the driver to adjust the positional relationship between the photographing unit and the eye based on real-time alignment state, enabling flexible adaptation to opacity positions without requiring complex manual intervention.
Solution Approach 2:
The patent employs feedback mechanisms where the processor monitors the alignment state and compares it with reference alignment information. Based on this feedback, the processor automatically adjusts the photographing unit position through the driver, creating a closed-loop control system that simplifies the alignment process while maintaining high image quality by continuously optimizing the optical path.
2Measurement precision
If alignment adjustment is performed to avoid opacity, then the fundus image quality is improved, but the ease of operation deteriorates
Solution Approach 1:
The patent implements self-service alignment where the apparatus automatically performs alignment adjustment without requiring manual intervention. The processor autonomously monitors alignment status, identifies opacity positions, and controls the driver to adjust the photographing unit position, making the system self-sufficient and easy to operate while maintaining high fundus imaging quality.
Solution Approach 2:
The patent replaces complex manual mechanical alignment procedures with automated electronic control systems. The processor uses electronic signals to control the driver, which adjusts the photographing unit position automatically based on digital alignment analysis, substituting manual mechanical operations with automated electro-optical control for simpler operation.
3Manufacturing precision
If traditional alignment methods are used, then alignment precision is achieved, but the device complexity and time consumption increase
Solution Approach 1:
The patent performs preliminary alignment setup by establishing a reference alignment state before actual fundus photographing. The processor pre-configures the photographing unit position and optical path parameters based on reference information, so that when opacity is detected, the system can quickly adjust from the pre-established reference state rather than performing alignment from scratch, reducing alignment time while maintaining precision.
Solution Approach 2:
The patent implements periodic alignment verification during the photographing process. The processor continuously or periodically checks the alignment state and makes minor adjustments as needed, rather than requiring a single time-consuming alignment procedure. This periodic verification maintains alignment precision while reducing overall time consumption by detecting and correcting deviations in real-time during imaging.
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 apparatus enables favorable photography of the fundus with opaque optic media by reducing the influence of opacity, improving image quality and simplifying the alignment process, while avoiding the complexity of traditional methods.
Implementation Method 1
a front photographing optical system that forms, on a pupil of an examinee's eye, an illuminating light projection region and an illuminating light receiving region next to each other in a first direction, the front photographing optical system scanning a fundus of the examinee's eye with illuminating light to acquire a two-dimensional reflection image of the fundus
Data Source
AI summary
A fundus photographing apparatus includes: a photographing unit including a front photographing optical system that forms, on a pupil of an examinee's eye, an illuminating light projection region and an illuminating light receiving region next to each other in a first direction, the front photographing optical system scanning a fundus of examinee's eye with illuminating light to acquire two-dimensional reflection image of the fundus; a driver that moves the photographing unit relative to examinee's eye; and a processor that switches, between a first and a second alignment mode, a control of guiding a positional relation between the examinee's eye and the photographing unit, the positional relation being guided to a first alignment state in predetermined positional relationship in the first alignment mode, and being guided to a second alignment state displaced at least in a direction crossing the first direction from the first alignment state in the second alignment mode.