Optical Mount with Groove Structures to Prevent Adhesive Migration
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Solution Overview
Problem
Conventional optical mounts face issues with adhesive migration onto the active area, which can negatively impact the performance of optical elements used in artificial reality systems.
Innovation Solution
The design incorporates a buffer area with groove structures and obstruction structures, such as micro-walls or micro-prisms, to prevent adhesive migration from the wall into the active area, and may include a diffuser to redirect light as needed for specific applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesives are placed on the top side of the wall to bond mounts together, then mounting reliability is improved, but adhesive migration into the active area occurs causing performance degradation
Solution Approach 1:
The buffer area is segmented into multiple functional zones: an adhesive application zone on the wall top side, a buffer zone with groove structures to contain migrating adhesive, and a protected active area. This segmentation prevents adhesive from reaching the optical element while maintaining bonding functionality.
Solution Approach 2:
The buffer area acts as an intermediary zone between the adhesive application area and the active area. Groove structures within the buffer area serve as physical barriers that intercept and contain adhesive migration, preventing direct contact between the adhesive and the optical element.
2Object-affected harmful factors
If a buffer area with groove structures is introduced to prevent adhesive migration, then optical element protection is improved, but device complexity increases
Solution Approach 1:
The buffer area with groove structures is integrated directly into the mount substrate as a monolithic structure, combining the protective function with the existing mount geometry. This eliminates the need for separate protective components and minimizes additional manufacturing steps.
Solution Approach 2:
The groove structures are strategically positioned only in the buffer area where adhesive migration is most likely to occur, rather than throughout the entire mount. This localized approach provides protection where needed while minimizing additional complexity in other regions.
Data Source
AI summary
A mount includes an active area in which an optical element may be located. The mount is bonded to a neighboring mount using adhesives that are placed on a top side of a wall structure of the mount. Migration of the adhesives from the wall of the mount into the active area is prevented by use of groove-structures and micro-wall structures located in a buffer area of the mount that circumscribes the active area. In some embodiments, a diffuser is located in the buffer area of the mount to redirect the emitted light as desired for a particular application.