HMD Cover Member Magnetic Attachment and Mechanical Segmentation
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Solution Overview
Problem
Head-mounted display apparatuses face issues with lens attachment due to the strong vertical magnetic force of magnets, making it difficult to move the lens parallel to the surface without it coming off the casing, and intensifying the magnet force complicates lens removal.
Innovation Solution
A head-mounted display apparatus with a cover member that includes a contact portion and a protruding portion, both positioned inside the outer edge, which are magnetically attracted to the support portion, preventing the cover member from sliding off and allowing for easy attachment and detachment by regulating its movement with magnetic forces and structural features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the magnet's attracting force is intensified to hold the cover member securely, then the attachment reliability is improved, but the ease of removal deteriorates
Solution Approach 1:
The attachment force is segmented into two components: strong vertical magnetic attraction for secure holding, and mechanical protrusions (first and second protruding portions) that engage with corresponding recesses to enable controlled removal. This segmentation allows the magnetic force to be optimized for attachment while mechanical features facilitate easy detachment.
Solution Approach 2:
The protruding portions act as intermediary mechanical elements between the cover member and support portion. These intermediaries provide a mechanical engagement mechanism that works in conjunction with the magnetic force, allowing the cover to be securely held during normal use but easily removed when needed by applying minimal force to disengage the protrusions.
2Reliability
If the magnet is positioned to strongly attract the cover member, then the attachment reliability is improved, but the cover member becomes difficult to move parallel to the surface without coming off
Solution Approach 1:
The attachment mechanism is segmented into magnetic attraction for vertical holding and mechanical protrusions for lateral positioning. The protruding portions extend in the lateral direction and engage with corresponding recesses, allowing the cover to be easily positioned and adjusted parallel to the surface without being held down by strong magnetic force in that direction.
Solution Approach 2:
Different regions of the attachment interface have different properties: the magnetic attractors provide strong vertical attraction locally, while the protruding portions provide mechanical guidance and positioning locally in the lateral direction. This local differentiation of attachment characteristics allows easy positioning without compromising overall attachment reliability.
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 ensures secure attachment and easy removal of the cover member, preventing it from sliding off while maintaining a compact and visually appealing design, allowing for effective image display and user interaction.
Implementation Method 1
at least one of the cover member and the support portion includes a magnet that attracts the other one of the cover member and the support portion by a magnetic force
Data Source
AI summary
A head-mounted display apparatus includes a display unit, a support portion configured to support the display unit, and a cover member is removably provided to the support portion. The cover member includes a contact portion that is positioned on a facing surface facing the support portion and that comes into contact with the support portion, and a first protruding portion that is positioned on the facing surface and that protrudes toward the support portion to be inserted into the support portion. At least one of the cover member and the support portion includes a magnet that attracts the other one by a magnetic force. The contact portion and the first protruding portion are provided on an inner side with respect to an outer edge of the cover member when the cover member is viewed in the direction opposite to the first direction.