Optical Unit for Ophthalmic Devices with Expanded Viewable Area
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Solution Overview
Problem
Existing ophthalmic devices struggle to provide an optimal viewing experience for observers, particularly in ophthalmic systems where the need for increased degrees of freedom and improved image display is crucial for diagnostics and surgical treatments.
Innovation Solution
The development of an optical unit with a specific configuration that includes a focal point on the incident side of light for setting a display image, emitting light from a focal plane as parallel light, and satisfying condition equations such as IB≥7570 mm3 and d1/d2>0.5, which enhance the viewable area and aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a conventional optical system is used in ophthalmic devices, then the device structure is simple, but the viewable area is limited and aberration correction is insufficient
Solution Approach 1:
The optical system is divided into multiple lens groups (first lens group, second lens group, third lens group) with specific configurations. Each lens group has designated functions: the first lens group forms the display image, the second lens group corrects aberrations, and the third lens group expands the viewable area. This segmentation allows each component to be optimized independently while achieving the overall goal of large viewable area with good aberration correction.
Solution Approach 2:
Different regions of the optical system are assigned different characteristics. The first lens group uses specific refractive indices and curvatures optimized for image formation, while the second and third lens groups have different optical characteristics optimized for aberration correction and field of view expansion. The condition equations (IB≥7570 mm³ and d1/d2>0.5) ensure that each lens group has locally optimized properties to achieve the overall performance goals.
2Area of stationary object
If the viewable area is increased, then the immersion experience is improved, but the optical path becomes longer and aberrations increase
Solution Approach 1:
The aberration correction function is extracted and assigned to a dedicated second lens group that is optically separated from the image-forming first lens group. This second lens group specifically addresses aberrations introduced by the wide field of view, using lenses with carefully selected refractive indices and curvatures to compensate for optical path differences and eliminate distortion while maintaining the expanded viewable area.
Solution Approach 2:
The optical system uses precise parameter optimization including refractive indices (n1, n2, n3), curvatures (r1, r2, r3), and spacing distances (d1, d2) that satisfy specific condition equations. By carefully adjusting these parameters, the system achieves both large viewable area (IB≥7570 mm³) and effective aberration correction, with the ratio d1/d2>0.5 ensuring proper optical path management.
3Manufacturing precision
If multiple lens groups are added for aberration correction, then image quality improves, but the device size increases
Solution Approach 1:
The optical system utilizes the longitudinal dimension (optical path length) efficiently by arranging lens groups at specific distances from each other along the optical axis. The condition equations specify precise axial distances (d1, d2) that optimize the compact arrangement. This dimensional organization allows multiple lens groups to be integrated in a space-efficient manner, achieving good aberration correction without excessive device volume.
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 significantly improves the viewable area and aberration correction, allowing for a more stable and immersive viewing experience for observers, even in complex ophthalmic procedures.
Implementation Method 1
an optical system that includes a focal point on an incident side of light at a position for setting a display image of an object and that is configured to emit light from a focal plane as parallel light
Data Source
AI summary
An optical unit includes an optical system that includes a focal point on an incident side of light at a position for setting a display image of an object and that is configured to emit light from a focal plane as parallel light. The optical unit also includes a housing section housing the optical system and is configured so as to satisfy a condition equation expressed byIB≥7570 mm3 wherein IB is a viewable area where the display image is viewable.