Reworkable Optical Element Mounting Assembly for HMDs
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Solution Overview
Problem
Conventional head-mounted display (HMD) mounting assemblies do not allow for the removal or replacement of optical elements without damaging the HMD, and lack flexibility in re-aligning optical elements with the display element once manufactured, leading to costly replacements and limited adaptability.
Innovation Solution
A mounting assembly with a reworkable active alignment system, featuring a housing and an element retainer where the optical element is fixed to the retainer via a first adhesive element and the retainer is fixed to the housing via a second adhesive element, allowing for the optical element to be removed and re-aligned without damaging the HMD.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If optical elements are fixed directly to the housing via adhesive elements, then the mounting structure is simple, but the optical elements cannot be removed or replaced without damaging the HMD
Solution Approach 1:
The mounting structure is segmented into three distinct components: the housing, the element retainer, and the optical element. The element retainer acts as an intermediate component that is fixed to the housing, while the optical element is fixed to the retainer. This segmentation allows the optical element to be removed and replaced by detaching it from the retainer, without damaging the housing or the adhesive bonds to the housing.
2Stability of the object's composition
If optical elements are fixed directly to the housing, then the alignment is stable, but there is no flexibility for re-aligning once manufactured
Solution Approach 1:
By segmenting the mounting structure into housing, element retainer, and optical element, the patent enables re-alignment flexibility. The optical element can be detached from the element retainer and re-positioned if alignment adjustments are needed, while the element retainer remains firmly attached to the housing, maintaining structural stability.
3Ease of manufacture
If optical elements are permanently fixed to the housing, then the manufacturing process is straightforward, but replacement costs are high when damage occurs
Solution Approach 1:
The segmented mounting structure allows the optical element to be replaced independently by removing it from the element retainer, without needing to damage or replace the entire housing assembly. This reduces replacement costs and improves the cost-effectiveness of repairs while maintaining a straightforward manufacturing process.
4Device complexity
If a single adhesive bond is used to fix optical elements to the housing, then the structure is simple, but the adhesive must withstand all operational stresses
Solution Approach 1:
The adhesive bonding is segmented into two separate bonds: one between the element retainer and the housing, and another between the optical element and the element retainer. This distributes the operational stresses across two adhesive joints rather than concentrating all stresses in a single bond, reducing the strength requirement for each individual adhesive bond.
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 cost-effective replacement and re-alignment of optical elements, improving the adaptability and maintenance of HMDs by allowing for the removal and re-installation of optical elements without damaging the HMD, thereby reducing replacement costs and enhancing flexibility in optical alignment.
Implementation Method 1
The first surface is fixed to the optical element via a first adhesive element
Implementation Method 2
The second surface is fixed to the housing via a second adhesive element
Data Source
AI summary
A mounting assembly for optical elements in a head-mounted display. The mounting assembly includes a housing and an element retainer. The housing encloses an optical element. The element retainer includes a first surface and a second surface. The first surface is fixed to the optical element via a first adhesive element. The second surface is fixed to the housing via a second adhesive element.