Three-Group Ophthalmic Objective Lens for Ultra-Wide-Field 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 an objective lens system with a positive first and second lens group, and a third lens group with a concave surface between them, forming an intermediate pupil position to correct aberrations and reduce lens diameter, thereby enhancing image forming performance and maintaining a wide field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary 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 lens is divided into three separate lens groups (first lens group, second lens group, and third lens group) with specific configurations. The third lens group includes a concave surface that diverges light, while the first and second lens groups are positive. This segmentation allows each group to perform specific optical functions, achieving wide field of view while keeping individual lens groups compact and manageable in size.
Solution Approach 2:
Different regions of the optical system have different lens configurations optimized for their specific functions. The third lens group with the concave surface is specifically positioned to diverge light and correct aberrations in the wide field region, while the positive lens groups handle focusing and overall optical path management. This localized optimization enables wide field of view without proportionally increasing overall device size.
2Area of stationary object
If a wide field angle is achieved using existing ophthalmic devices, then the field of view is improved, but the weight increases
Solution Approach 1:
By segmenting the objective lens into three distinct lens groups with specific configurations, the system achieves wide field of view while distributing the optical load across multiple smaller components rather than requiring a single large heavy lens. The third lens group with the concave surface is specifically designed to diverge light and correct aberrations in the wide field region, while the positive lens groups handle focusing and overall optical path management. This localized optimization enables wide field of view without proportionally increasing overall device size.
3Volume of moving object
If a compact size is achieved, then the device size is reduced, but aberration correction deteriorates
Solution Approach 1:
Different regions of the optical system have different lens configurations optimized for their specific functions. The third lens group with the concave surface is specifically positioned to diverge light and correct aberrations in the wide field region, while the positive lens groups handle focusing and overall optical path management. This localized optimization enables wide field of view without proportionally increasing overall device size.
Solution Approach 2:
The third lens group with the concave surface acts as an intermediary element between the light source and the retina. It specifically targets and corrects optical aberrations that occur in wide field observations by diverging light rays before they reach the retinal imaging plane. This intermediary correction allows the system to maintain compact size while achieving acceptable aberration correction for wide field applications.
4Volume of moving object
If a compact size is achieved, then the device size is reduced, but image forming performance deteriorates
Solution Approach 1:
The objective lens is divided into three separate lens groups (first lens group, second lens group, and third lens group) with specific configurations. The third lens group includes a concave surface that diverges light, while the first and second lens groups are positive. This segmentation allows each group to perform specific optical functions, achieving wide field of view while keeping individual lens groups compact and manageable in size.
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 high-performance, compact ophthalmic devices capable of ultra-wide field observations with improved aberration correction and reduced weight, while maintaining a wide field of view.
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.