Objective Optical Layout for Wide-Field Fundus Imaging
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Solution Overview
Problem
Existing ophthalmic devices face challenges in achieving a wide field of view for fundus imaging while maintaining a compact and cost-effective optical design, and optimizing pupil aberration to prevent vignetting of scanning light at the pupil.
Innovation Solution
The ophthalmic device employs an objective lens with specific lens configurations that satisfy conditional expressions for lens thickness and angular magnification ratios, ensuring a medium-angle field of view (60° to 80°) and optimizing pupil aberration (0.1≤D/L≤0.25) to prevent vignetting, using a combination of positive lens groups and scanning sections to achieve efficient imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the field of view is increased to achieve wide-angle fundus imaging, then the imaging coverage is improved, but the optical system complexity and vignetting of scanning light increase
Solution Approach 1:
The patent applies parameter changes by optimizing the conditional expression 0.1 ≤ D/L ≤ 0.25, where D is the sum of central thicknesses of lenses and L is the distance from the pupil conjugate position to the subject eye. This parameter optimization enables the objective lens to achieve a medium-angle field of view (60° to 80°) while controlling optical system complexity and preventing vignetting of scanning light.
2Manufacturing precision
If lens thickness is increased to improve imaging quality, then the optical performance is improved, but the device weight and complexity increase
Solution Approach 1:
The patent optimizes lens parameters by constraining the ratio D/L (sum of central thicknesses of lenses divided by distance from pupil conjugate position to subject eye) to satisfy 0.1 ≤ D/L ≤ 0.25. This parameter optimization achieves improved imaging quality through proper lens thickness control while preventing excessive device weight and complexity.
3Loss of energy
If the pupil aberration is optimized to prevent vignetting, then the light transmission is improved, but the optical design complexity increases
Solution Approach 1:
The patent addresses pupil aberration and light transmission by optimizing the conditional expression 0.1 ≤ D/L ≤ 0.25. This parameter optimization simultaneously improves light transmission by preventing vignetting of scanning light while maintaining reasonable optical design complexity through systematic lens parameter control.
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 solution enables efficient scanning and imaging of the fundus over a wide field of view (60° to 80°) with reduced costs and improved transmittance, while minimizing the weight and complexity of the optical system.
Implementation Method 1
an objective optical system that forms a pupil that has a conjugate relationship with a pupil of the subject eye
Data Source
AI summary
An ophthalmic optical system for observing an subject eye, including: an objective optical system that forms a pupil that has a conjugate relationship with a pupil of the subject eye, wherein, given that a distance from a pupil position that has a conjugate relationship with the pupil of the subject eye to the pupil of the subject eye is L, and a sum of central hicknesses of lenses included in the objective optical system is D, a conditional expression expressed by0.1≤D/L≤0.25is satisfied.