HMD Band Adjustment Mechanism Using Spiral Spring
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Solution Overview
Problem
Existing head-mounted displays (HMDs) face challenges in adjusting to fit different head sizes effectively, particularly in maintaining a secure fit without increasing the size of the adjustment mechanism, which can complicate the design and increase part count.
Innovation Solution
The proposed HMD incorporates a mounting band with an adjustment mechanism featuring a spiral spring that applies elastic force to adjust the band length, a ratchet mechanism to restrict rotation direction, and a clutch mechanism for interlocking the link member with the operation dial, allowing for size adjustment while minimizing the mechanism's size and part count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rubber band and operation dial are used to adjust the mounting band size, then the mounting band can be temporarily fixed and adjusted to fit different head sizes, but the adjustment mechanism becomes complex and increases in size
Solution Approach 1:
The patent combines the rubber band elastic force mechanism with the operation dial adjustment mechanism into an integrated system. The rubber band is positioned to directly interact with the operation dial, merging the temporary fixation function and the size adjustment function into a unified mechanism that reduces overall complexity while maintaining both adaptability features
Solution Approach 2:
The operation dial serves multiple functions: it acts as both the adjustment control for changing band size and as part of the fixation mechanism working with the rubber band. This multi-functionality reduces the need for separate components, thereby reducing mechanism complexity while preserving adjustability across different head sizes
2Adaptability or versatility
If a rubber band and operation dial are used to adjust the mounting band size, then the mounting band can be temporarily fixed and adjusted to fit different head sizes, but the number of parts increases
Solution Approach 1:
The patent merges the fixation function and adjustment function into a single integrated mechanism involving the rubber band and operation dial. By combining these functions into one interconnected system rather than using separate independent mechanisms, the total number of parts is reduced while maintaining the ability to adjust and temporarily fix the mounting band for different head sizes
3Length of moving object
If the spiral spring is arranged with its center line extending along the forward and rearward direction, then the size of the adjustment mechanism in the forward and rearward direction is suppressed, but the spring must be precisely positioned
Solution Approach 1:
The patent positions the spiral spring such that its center line extends along the forward and rearward direction, utilizing this specific dimensional orientation to minimize the mechanism's size in that direction. The spring is precisely positioned within the mounting band structure, leveraging the dimensional constraint to achieve compact design while the precise positioning ensures proper mechanical function
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
This solution enables secure fitting of the HMD to various head sizes without increasing the mechanism's size, reducing the number of parts and enhancing user operability, while maintaining effective length adjustment and secure locking.
Implementation Method 1
The adjustment mechanism includes a spiral spring that applies elastic force to the link member
Implementation Method 2
The adjustment mechanism includes a ratchet mechanism that restricts a rotation direction of the operation member to one direction
Data Source
AI summary
Provided is a head-mounted display which can use a spring for adjusting the size of a mounting band to the head of a user while suppressing increase of the size of an adjustment mechanism in a forward and rearward direction. The adjustment mechanism includes an operation dial operated by a user and a link member held in engagement with a rear portion (rack) of a right band portion and a rear portion (rack) of a left band portion, and moves the link member in such a manner that the length of the mounting band changes in response to a movement of the operation dial. The adjustment mechanism includes a spiral spring that applies elastic force to the link member. The spiral spring is arranged in such a manner as to have its center line extending along the forward and rearward direction as viewed in top plan.