Ophthalmologic Imaging Apparatus Wavelength Focus Adjustment
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Solution Overview
Problem
Existing ophthalmologic imaging apparatuses are bulky, complex, and require multiple components to handle different wavelengths of light for capturing images of the eye, which limits their portability and simplicity.
Innovation Solution
A focusing unit is used to capture light returned from the eye illuminated by one wavelength, and a moving unit adjusts based on optical path length differences when light of a different wavelength is focused, allowing for a smaller, lighter, and simpler apparatus with a unified imaging unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple image capturing means are used to handle different wavelengths of light, then the imaging capability for both mydriatic and non-mydriatic observations is improved, but the device complexity and size increase
Solution Approach 1:
The patent employs a single image capturing means (CCD) that can capture images across different wavelengths by utilizing a focusing unit that adjusts focus for both visible light (mydriatic observation) and near-infrared light (non-mydriatic observation). This universal approach eliminates the need for separate image capturing devices for each wavelength, thereby reducing device complexity while maintaining versatile imaging capability
Solution Approach 2:
The patent merges the functions of multiple image capturing means into a single unified system. By combining the mydriatic and non-mydriatic imaging functions into one apparatus with a single CCD sensor and an adjustable focusing unit, the system achieves both imaging capabilities without requiring separate devices, thus reducing overall device complexity and integration requirements
2Measurement precision
If optical path length correction elements are added to handle wavelength differences, then the imaging precision for different wavelengths is improved, but the device complexity and weight increase
Solution Approach 1:
The patent employs a dynamic focusing unit that can adjust its focal length or position to accommodate different wavelengths of light. Instead of using static optical path length correction elements for each wavelength, the focusing unit dynamically adapts its parameters based on whether visible light (mydriatic) or near-infrared light (non-mydriatic) is being used, thereby maintaining imaging precision while avoiding the complexity of multiple fixed correction elements
Solution Approach 2:
The patent changes the optical parameters (such as focal length or focus position) of the focusing unit to optimize imaging for different wavelengths. By adjusting these parameters dynamically rather than incorporating separate correction elements for each wavelength, the system maintains high imaging precision across both mydriatic and non-mydriatic modes while minimizing device complexity
3Measurement precision
If separate optical paths are used for mydriatic and non-mydriatic observations, then the imaging quality for each mode is improved, but the device size and portability are worsened
Solution Approach 1:
The patent segments the optical path using a mirror that can switch between directing visible light and near-infrared light to the same image capturing means. This segmentation allows different wavelengths to follow different paths temporarily while converging on a single sensor, maintaining imaging quality for each mode while avoiding the need for separate complete optical systems that would increase device size and reduce portability
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
This approach results in a more compact, efficient, and versatile imaging system capable of capturing images using different wavelengths, enhancing portability and reducing component complexity.
Implementation Method 1
a moving unit configured to move the focusing unit based on an optical path length difference between the light of the first wavelength and the light of a second wavelength
Data Source
AI summary
An ophthalmologic imaging apparatus that captures an image of a subject's eye is provided. The apparatus includes a focusing unit configured to focus light returned from the subject's eye that is illuminated by the light of a first wavelength, onto an imaging unit, and a moving unit configured to move the focusing unit based on an optical path length difference between the light of the first wavelength and the light of a second wavelength that is different from the first wavelength when light returned from the subject's eye that is illuminated by the light of the second wavelength is focused onto the imaging unit.