HMD Case Segmentation for Waterproofing Without Adhesives
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Solution Overview
Problem
Existing head-mounted display (HMD) technologies face challenges in achieving a waterproof structure without complicating assembly processes, particularly when exposed to outdoor conditions where rain and sweat can enter the device.
Innovation Solution
The HMD design incorporates a case member with an inner case having a rib surrounding the control section and an outer case that covers both the image projection and control sections, preventing liquid entry and adherence, eliminating the need for adhesive fillers in gaps and simplifying assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive fillers are used to seal gaps between components to prevent liquid entry, then waterproofing performance is improved, but assembly complexity and manufacturing time increase
Solution Approach 1:
The case is divided into an outer case and an inner case as separate components. The inner case is inserted into the outer case, creating a nested structure that provides waterproofing without requiring adhesive fillers in gaps. This segmentation allows each case to be manufactured and assembled independently, simplifying the overall assembly process while maintaining reliable waterproofing performance.
2Reliability
If adhesive fillers are used to seal gaps between components, then waterproofing performance is improved, but manufacturing time and production efficiency decrease
Solution Approach 1:
The case is segmented into outer and inner cases that can be manufactured separately and assembled through simple insertion. This eliminates the time-consuming process of applying adhesive fillers to seal gaps, significantly improving assembly efficiency while maintaining waterproofing performance through the nested structure design.
3Device complexity
If a simple case structure is used without additional waterproofing components, then device complexity is reduced, but waterproofing reliability deteriorates due to liquid entry through gaps
Solution Approach 1:
The inner case is nested within the outer case, creating a protective enclosure for the control section. This nested configuration provides effective waterproofing by preventing liquid entry through the case structure, while maintaining relative simplicity as both cases are basic structural components without complex additional waterproofing elements.
Data Source
AI summary
A head mounted image display apparatus including an image projection section that forms an image and projects the image, a display section that displays the image projected by the image projection section, a control section that controls the image formation performed by the image projection section, a frame member that supports the display section, and a case member that is attached to the frame member and accommodates the image projection section and the control section, wherein the control section is located below the image projection section, and the case member includes an inner case that has a first rib surrounding the circumference of the control section and is located between the image projection section and the control section and an outer case that is attached to the frame member and covers the image projection section and the control section and further covers the inner case.