Virtual Image Display Apparatus Aberration Correction
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Solution Overview
Problem
Existing virtual image display apparatus using only eccentric curved mirrors struggle with insufficient aberration correction and limited resolution due to the inability to bring optical surfaces close enough, which restricts the angle of view and optical performance.
Innovation Solution
A virtual image display apparatus incorporating a lens, a first mirror member, a refractive reflective optical member with both refractive and mirror surfaces, and a transmissive third mirror member, where the lens and refractive reflective optical member are integrated as a composite unit, forming an eccentric optical system that corrects aberrations and enhances resolution over a wide angle of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If only eccentric curved mirrors are used in the optical system, then weight reduction is achieved, but optical surfaces cannot be brought close enough together resulting in insufficient aberration correction and limited resolution
Solution Approach 1:
The patent combines multiple optical element types (lens, reflective mirrors, and refractive reflective optical members) into a single integrated optical system. Specifically, the refractive reflective optical member integrates both refractive and reflective surfaces in one component, allowing optical surfaces to be positioned closer together while maintaining effective aberration correction and resolution
Solution Approach 2:
The optical system uses composite optical structures including the refractive reflective optical member that combines different optical functions (refraction and reflection) in a single element. This composite approach enables closer spacing of optical surfaces while achieving the necessary aberration correction performance
2Device complexity
If only eccentric curved mirrors are used, then device complexity is reduced, but angle of view and optical performance cannot be improved
Solution Approach 1:
The refractive reflective optical member serves multiple functions simultaneously - it provides both refraction and reflection capabilities within a single component. This multi-functionality allows the optical system to achieve wider angle of view and improved optical performance without proportionally increasing device complexity
Solution Approach 2:
By merging the lens and refractive reflective optical member into an integrated composite member, the patent reduces the number of separate components while maintaining enhanced optical performance and wider angle of view capabilities
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 integrated optical system improves aberration correction and optical performance, allowing for a wider angle of view and reduced distortion, enabling more precise and reliable virtual image display with enhanced resolution.
Implementation Method 1
a lens (40), which refracts imaging light from the image forming unit
Implementation Method 2
a first mirror member (21), which reflects imaging light that has passed through the lens (40)
Implementation Method 3
a second mirror member (22), which reflects imaging light reflected by the first mirror member (21)
Implementation Method 4
a third mirror member (23) which reflects imaging light reflected by the second mirror member (22) toward a position of an exit pupil
Data Source
AI summary
A virtual image display apparatus includes a display device (image forming unit), a lens configured to refract imaging light from the display device, a first mirror member configured to reflect imaging light that passed through the lens, a second mirror member being a refractive reflective optical member configured to reflect the imaging light reflected by the first mirror member, and a third mirror member of a transmissive type configured to reflect the imaging light reflected by the second mirror member toward a position of an exit pupil. The refractive reflective optical member includes, across a refractive member, a refractive surface and a mirror surface. The lens and the refractive reflective optical member are integrated as a composite member.