Kinematic Lens Mount Debris Mitigation for Head-Mounted Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electronic devices such as head-mounted devices are prone to debris contamination, which can interfere with their operation and alignment of removable vision correction lenses, leading to inaccuracies in image presentation.
Innovation Solution
Incorporation of kinematic mount alignment structures with debris mitigation features such as kinematic mount alignment protrusions and recesses, magnets for debris attraction, adhesive for gathering debris, and liquid drainage holes to ensure accurate alignment and prevent contamination, allowing for the use of removable vision correction lenses that correct vision defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If removable vision correction lenses are used to correct user vision defects, then the device can accommodate different vision needs, but debris contamination can interfere with the alignment and operation of these lenses
Solution Approach 1:
The patent applies preliminary action by providing debris covers that pre-protect the alignment structures before the removable lenses are attached to the optical assemblies. The debris covers are positioned to shield the alignment protrusions and recesses from debris contamination, and are removed or moved aside only when the lens is being aligned and attached, thus preventing contamination in advance while allowing alignment when needed
Solution Approach 2:
The patent converts the harmful effect of debris into a beneficial feature by incorporating magnets that actively attract and collect debris particles. The magnets are positioned to draw debris away from the alignment structures and toward designated collection areas, transforming the harmful debris into a controlled element that does not interfere with lens alignment
2Manufacturing precision
If kinematic mount alignment structures are used to align removable lenses, then accurate alignment is achieved, but the alignment structures are vulnerable to debris interference
Solution Approach 1:
The debris covers provide pre-protection to the alignment structures before they are exposed during lens attachment. By covering the alignment protrusions and recesses in advance, the system prevents debris from compromising the alignment accuracy, ensuring that when the covers are removed and alignment occurs, the structures remain clean and functional
Solution Approach 2:
The debris covers act as intermediary elements between the external environment and the alignment structures. They mediate by blocking debris from directly contacting the alignment protrusions and recesses, while still allowing the alignment function to occur when the covers are temporarily moved aside during the lens attachment process
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 effectively prevents debris from interfering with the alignment of removable lenses, ensuring accurate image presentation and maintaining the operational integrity of head-mounted devices by mitigating dust and other contaminants.
Implementation Method 1
magnets for attracting debris
Implementation Method 2
adhesive for gathering debris
Data Source
AI summary
A head-mounted device may include optical assemblies for presenting images to a user. Each optical assembly may have a support, a fixed lens mounted to the support, and a display configured to provide an image to an eye box through the fixed lens. Removable vision correction lenses may be used to correct for user vision defects such as nearsightedness. The vision correction lenses may be removably coupled to the optical assemblies. When coupled to the optical assemblies, the vision correction lenses overlap the fixed lenses. Each removable vision correction lens and corresponding optical assembly may have structures such as kinematic mount alignment protrusions and recesses configured to form a kinematic coupling. Debris mitigation features may be provided such as alignment structure debris covers, debris collection grooves, magnets for attracting debris, adhesive for gathering debris, and liquid drainage holes to facilitate washing to remove debris.