Telescoping Strap Adjuster for Head-Mounted Displays
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Solution Overview
Problem
Conventional head-mounted display systems face challenges in precisely tailoring head straps to fit varying head circumferences, leading to mechanical failure and discomfort, especially as these systems become more complex and heavier.
Innovation Solution
A telescoping strap adjuster with a gas spring mechanism that allows for adjustable head strap sizing, featuring a piston rod and cylinder, and an adjustable dial to customize the spring constant for optimal fit and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional head strap is used, then the head mounted display can be worn, but the strap cannot be precisely tailored for varying head circumferences
Solution Approach 1:
The head strap incorporates a telescoping mechanism with movable segments that allow dynamic adjustment of strap length and configuration. This enables the strap to adapt to different head circumferences while maintaining precise fit through user-adjustable telescopic sections.
Solution Approach 2:
The strap system allows modification of physical parameters such as length and tension through telescoping adjustments. Users can change the effective length of strap segments to precisely match their head circumference, transforming a fixed-parameter strap into a variable-parameter system.
2Adaptability or versatility
If the head mounted display becomes more complex and heavier, then the display functionality is improved, but the conventional head strap cannot comfortably support it
Solution Approach 1:
The telescoping strap mechanism provides dynamic adjustment capabilities that allow users to optimize strap tension and distribution to accommodate heavier displays. The adjustable segments enable redistribution of weight across different portions of the head, improving comfort while supporting increased device weight.
Solution Approach 2:
The head strap is divided into multiple telescoping segments that can be independently adjusted. This segmentation allows for localized adjustment of tension and fit, enabling the strap to comfortably support heavier displays by distributing weight more effectively across the head.
3Reliability
If a conventional head strap is used, then the display can be positioned, but the strap is susceptible to mechanical failure
Solution Approach 1:
The strap is divided into multiple modular telescoping segments rather than a single continuous structure. This segmentation allows individual segments to be replaced if failed, and distributes mechanical stress across multiple joints and connection points, reducing the likelihood of complete strap failure.
Solution Approach 2:
The telescoping mechanism incorporates built-in flexibility and adjustment capacity that acts as a buffer against mechanical failure. The ability to adjust and redistribute stress prevents any single point from bearing excessive load that could lead to failure.
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
Enables precise and comfortable fitting of head-mounted displays across different head sizes by allowing users to adjust the head strap opening size and tightness, improving wearability and reducing mechanical stress.
Implementation Method 1
The telescoping strap adjuster includes a gas spring embodied as a cylinder and piston rod. As the piston rod translationally displaces relative to the cylinder, the movement of the piston rod is further translated to the head strap.
Implementation Method 2
After termination of the force input on the head strap, the telescoping strap adjuster returns to its default position, thereby causing the head strap to return towards its default head strap opening size until the head strap opening size is tailored for the size of the user's head.
Data Source
AI summary
A telescoping strap adjuster is embodied as a gas spring that enables a head strap of a head mounted display system to be worn around an individual's head. The gas spring includes a piston rod that translationally displaces, which adjusts the size of an opening of formed by the head strap. In the default configuration, the piston rod of the telescoping strap adjuster is fully extended, thereby causing the head strap opening to be minimized. A user can provide a force input to enlarge the head strap opening and subsequently don the head mounted display system. Once the force input is ceased, the telescoping strap adjuster reverts towards its default configuration and tightens the head strap such that the opening is tailored for the user's head size.