Virtual Image Display Apparatus Dust-Proofing
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Solution Overview
Problem
Existing virtual image display apparatuses face challenges in forming intermediate images entirely within optical members due to dirt or contamination on the surface, leading to image degradation, especially when using relay optical systems in head mount displays.
Innovation Solution
A virtual image display apparatus with a light guiding member having partially covered optical surfaces and a coupling member that covers the light guiding member, forming intermediate images separated from the partially covered surfaces, and incorporating a dust-proofing structure to prevent contamination and dirt from affecting image formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the intermediate image is formed on the surface of the optical member, then the optical system can be compact, but dirt or contamination on the surface causes image degradation
Solution Approach 1:
A dust-proof member is introduced as an intermediary component between the optical member and the external environment. This dust-proof member covers the optical surface where the intermediate image is formed, preventing dirt and contamination from reaching the surface while allowing the optical system to maintain its compact design with the intermediate image formed on the surface.
2Reliability
If the intermediate image is formed inside the optical member, then image quality is maintained, but the optical system size increases
Solution Approach 1:
The dust-proof member serves as a protective intermediary that enables the intermediate image to be formed on the surface of the optical member without compromising image quality. By blocking contaminants while allowing optical functionality, the system achieves both compact size and maintained image quality.
3Reliability
If the optical surface is partially covered by the coupling member, then protection is provided, but the covered area cannot be cleaned
Solution Approach 1:
The dust-proof member acts as a removable intermediary cover that protects the optical surface during operation but can be removed to allow cleaning. This solves the contradiction by providing protection when needed while enabling maintenance access when required.
Solution Approach 2:
The dust-proof member is designed to be movable or removable, transforming the static covered state into a dynamic system where the cover can be positioned to either protect or allow cleaning of the optical surface, depending on operational requirements.
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 allows for the formation of images with a wide angle while maintaining light guidance, reducing the influence of dirt or contamination on the image and preventing image degradation by positioning intermediate images away from surfaces prone to contamination.
Implementation Method 1
a light guiding member which has a plurality of optical surfaces, guides video image light from the video image element by reflecting the video image light by an internal surface
Data Source
AI summary
In relation to a fourth surface as a partially covered optical surface from among a plurality of optical surfaces which configure a light guiding member in a light guiding device, such as a first surface, an intermediate image is formed at a location separated from the partially covered optical surface (fourth surface). With such a configuration, it is possible to reduce the influence of dirt, contamination, or the like on an image even if the dirt, the contamination, or the like are generated on the partially covered optical surface (fourth surface), from which it is difficult or impossible to remove the dirt, the contamination, or the like, and to display an image with a wide image angle by a configuration forming an intermediate image.