Constant Load Spring Mounting Band for HMDs
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Solution Overview
Problem
Existing head-mounted displays burden users with high operational loads when mounting the mounting band due to increased elastic force as the circumference is expanded, and existing solutions do not effectively reduce this load.
Innovation Solution
A head-mounted display with a mounting band featuring a stretching unit, adjustment mechanism, and a spring member that generates constant elastic force, allowing the band to be easily accommodated into a case, reducing the load on the user by maintaining fixed elastic force regardless of the band's circumference expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a rubber band is used to generate elastic force for mounting the mounting band, then the mounting band can be temporarily mounted on the user's head, but the elastic force increases as the circumference is expanded more, making the mounting operation burdensome
Solution Approach 1:
The patent changes the parameter of elastic force from variable (increasing with circumference expansion) to constant (maintained at a fixed level). This is achieved by using a constant load spring mechanism where the spring generates a predetermined constant elastic force regardless of the stretching distance, thereby resolving the contradiction between maintaining mounting force and ease of operation.
2Adaptability or versatility
If the mounting band is expanded to increase circumference for easier mounting, then more user head sizes can be accommodated, but the elastic force becomes excessively large increasing operational burden
Solution Approach 1:
The patent maintains the elastic force parameter at a constant level while allowing the circumference to vary. The constant load spring mechanism ensures that regardless of how much the mounting band is expanded to accommodate different head sizes, the elastic force remains at a predetermined constant value, thus resolving the contradiction between adaptability and force magnitude.
3Force
If a constant load spring is used to generate fixed elastic force for adjusting mounting position, then the elastic force remains constant during adjustment, but the solution does not reduce the operational burden on the user when mounting the band
Solution Approach 1:
The patent applies the constant load spring mechanism to change the elastic force parameter from variable to constant. By doing so, the mounting band can be expanded to any circumference without generating excessive elastic force, making the mounting operation easier while maintaining constant elastic force for secure fitting.
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 significantly reduces the load on the user during mounting by maintaining consistent elastic force, allowing for easier expansion and contraction of the band's circumference, enhancing user comfort and reducing operational burden.
Implementation Method 1
a spring member which is fixed at a front portion thereof to the stretching unit and is wound at a rear portion thereof on the winding target member... the spring member generating elastic force to act in a direction in which the stretching unit is accommodated into the case
Data Source
AI summary
An HMD includes a mounting band for surrounding a head H of a user. The mounting band includes a case, a stretching unit, an adjustment mechanism that adjusts a length of the stretching unit to be accommodated in the case by relatively moving the stretching portion with respect to the case, a winding target member, and a spring member which is fixed at a front portion thereof to the stretching unit and at a rear portion thereof wound on the winding target member and in which an unwinding amount from the winding target member changes according to the length of the stretching unit accommodated in the case. The spring member generates elastic force that acts in a direction in which the stretching portion is accommodated into the case. A first elastic force of the spring member generated by a first unwinding amount and a second elastic force of the spring member generated by a second unwinding amount are equal to each other.