Ring-Shaped HMD Mount With Torque-Limited Circumference Adjustment
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Solution Overview
Problem
Existing head mounted devices (HMDs) face challenges in providing easy mounting and demounting with fine adjustments to accommodate various head shapes, and existing circumference variable mechanisms require complex operations that cause user inconvenience.
Innovation Solution
A ring-shaped mount unit with a first and second housing, featuring a circumference variable mechanism that allows enlargement and reduction through engagement of band portions with a pinion and torque limiter or friction plates, enabling intuitive rough and fine adjustments without complex operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a retention mechanism is provided to prevent the inner belt from moving in a direction where the inner belt is removed from the outer belt, then the HMD can be securely held on the user's head, but it becomes difficult to make fine adjustments to enlarge the circumference of the mount unit
Solution Approach 1:
The patent employs a dynamic adjustment mechanism where the dial can rotate to change the circumference of the mount unit. The holding member engages with different positions on the dial to maintain the adjusted circumference, allowing both secure holding and flexible adjustment. This dynamic system resolves the contradiction by making the holding force adjustable rather than fixed.
Solution Approach 2:
The patent changes the parameter of circumference by rotating the dial, which moves the holding member to engage with different positions on the dial's circumference. This allows continuous adjustment of the mount unit's circumference while maintaining secure holding through the engagement mechanism, thereby resolving the contradiction between fixed holding and adjustable circumference.
2Adaptability or versatility
If a rack and pinion is combined with a latching mechanism to enable circumference adjustment, then the mount unit can be adjusted, but the user must keep turning the dial to achieve maximum circumference which causes inconvenience
Solution Approach 1:
The patent applies preliminary action by providing a release button that, when pressed, automatically releases the holding member from the dial. This allows the dial to be freely rotated to maximum circumference without continuous manual engagement, reducing operation complexity while maintaining full adjustment range.
Solution Approach 2:
The system allows the dial to rotate freely when the holding member is released, enabling the user to achieve maximum circumference simply by rotating the dial without continuous turning or complex operations. The mechanism serves itself by maintaining position only when needed, otherwise allowing free movement.
Data Source
AI summary
A head mounted device includes a ring-shaped mount unit for mounting the head mounted device on a head of a user, the ring-shaped mount unit including a first housing having a band portion on each of both sides thereof and a second housing having an engagement portion to be engaged with the band portion, and the ring-shaped mount unit being formed in a ring shape that enables enlargement and reduction of a circumference thereof by engagement of the band portion with the engagement portion. The head mounted device further includes a circumference holding unit, such as a torque limiter, configured to generate a holding force at least in a circumference enlargement direction of the ring-shaped mount unit.