Eyepiece Optical Member Segmentation for Cleanable HMD
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Solution Overview
Problem
Existing eyepiece optical members for head-mounted displays face issues with rainwater and sweat entering the gap between the light guide prism and protective cover, leading to soiling and difficulty in cleaning, which can cause unnecessary scattering and material property changes.
Innovation Solution
An eyepiece optical member design featuring a housing with opposing plate-like portions that sandwich a light guide prism and protective member, allowing for easy attachment and detachment, with convexities and concavities for engagement, enabling simple cleaning without tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the protective cover is secured to the light guide prism, then protection is improved, but cleaning accessibility deteriorates
Solution Approach 1:
The protective cover and light guide prism are divided into separate components that can be easily detached from each other. The protective cover is designed as a separate piece that can be removed without tools, allowing users to access and clean the light guide prism surface while maintaining protection during normal use.
2Stability of the object's composition
If the protective cover is secured to the light guide prism, then structural stability is improved, but maintenance difficulty increases
Solution Approach 1:
The protective cover is designed as a separable component rather than a permanently fixed part. This segmentation allows the cover to provide structural stability and protection during normal operation, while enabling easy removal for cleaning and maintenance without requiring tools or complex disassembly procedures.
3Object-affected harmful factors
If rainwater and sweat enter the gap between the light guide prism and protective cover, then soiling occurs, but cleaning complexity increases
Solution Approach 1:
The protective cover is designed as a removable component that can be easily detached from the light guide prism. This segmentation prevents soiling by allowing users to remove the cover and clean the prism surface directly, eliminating the complexity of cleaning trapped contaminants from tight gaps between fixed components.
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
Facilitates easy cleaning and maintenance of the optical member, preventing soiling and maintaining image quality while allowing for easy assembly and disassembly, reducing size and weight, and ensuring a clear field of view.
Implementation Method 1
a light guide prism in which image light from the display element enters through an entrance surface and is guided to exit from an exit surface towards an eyeball of an observer so as to be observed as a magnified virtual image
Implementation Method 2
a concavity and a convexity may form a pair, the protective member including one of the concavity and the convexity, and the light guide prism including the other of the concavity and the convexity; and by the protective member and the light guide prism being sandwiched between the two opposing plate-like portions, the concavity and the convexity may engage to configure the protective member and the light guide prism as the assembled member
Data Source
AI summary
An eyepiece optical member has an easy-to-clean interior, and a head-mounted display device is provided with the eyepiece optical member. The eyepiece optical member includes a housing with a built-in display element, a light guide prism in which image light from the display element enters through an entrance surface and is guided to exit from an exit surface towards an eyeball of an observer so as to be observed as a magnified virtual image, and a protective member formed separately from the housing and covering a portion of the light guide prism. The housing includes two opposing plate-like portions, the light guide prism is fixed to the protective member as an assembled member, and the assembled member is sandwiched between the two opposing plate-like portions. The head-mounted display device includes a support member for fixation to a wearer's head and includes the eyepiece optical member attached to the support member.