Three-Group Ophthalmic Optics for Compact Ultra-Wide Imaging
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Solution Overview
Problem
Existing ophthalmic devices face challenges in achieving a wide field of view while maintaining compact size and effective aberration correction, particularly in ultra-wide field observations of the eye.
Innovation Solution
The ophthalmic device employs a specific optical system configuration with a first and second positive lens group and a third lens group that includes a concave surface to diverge light, forming an intermediate pupil position between the lens groups, which helps in reducing lens diameter and weight, and enhances aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a wide field angle is achieved using existing ophthalmic devices, then the field of view is improved, but the device size and weight increase
Solution Approach 1:
The objective optical system is divided into three distinct lens groups: a first positive lens group, a second positive lens group, and a third lens group with a concave surface positioned between them. This segmentation allows each group to perform specific optical functions, enabling wide field of view while maintaining compact size through optimized light paths and intermediate pupil formation.
2Area of moving object
If a wide field angle is achieved using existing ophthalmic devices, then the field of view is improved, but the lens diameter and weight increase
Solution Approach 1:
The lens system is segmented into three groups with specific refractive power distributions. The third lens group with the concave surface acts as an intermediate element that forms an intermediate pupil, allowing the system to achieve wide field of view with reduced lens diameter and weight compared to conventional two-group designs.
3Volume of moving object
If a compact size is achieved, then the device size is reduced, but aberration correction becomes difficult
Solution Approach 1:
The third lens group is specifically designed with a concave surface that has optimized refractive properties. This local optimization in the intermediate lens group provides targeted aberration correction for the wide field of view application, compensating for optical aberrations while maintaining compact device size.
Solution Approach 2:
The third lens group with the concave surface serves as an intermediary element between the first and second positive lens groups. It forms an intermediate pupil that mediates the light paths, enabling effective aberration correction in a compact configuration by optimizing the overall optical path length and ray angles.
4Manufacturing precision
If a three-lens-group configuration is used, then aberration correction is improved, but the device complexity increases
Solution Approach 1:
The objective optical system is segmented into three lens groups with clear functional assignments: the first and second groups provide positive refractive power for focusing, while the third group with the concave surface provides intermediate pupil formation and aberration correction. This segmentation organizes the complexity into manageable functional modules.
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 configuration allows for a compact, ultra-wide field of view with improved image forming performance and reduced lens diameter, effectively addressing the challenges of aberration correction and size in ophthalmic devices.
Implementation Method 1
a third lens group that is disposed between the first lens group and the second lens group, and that includes a concave surface configured to diverge light
Data Source
AI summary
An ophthalmic device for observing a subject eye, including: a light source; a scanning section that scans light from the light source; and an objective optical system configured to form a pupil, which has a conjugate relationship with a pupil of the subject eye, at the scanning section, wherein the objective optical system has, in order from the scanning section toward the subject eye, a first lens group that is positive, a second lens group that is positive, and a third lens group that is disposed between the first lens group and the second lens group, and that includes a concave surface configured to diverge light.