Light-Guide Optical Element Encapsulation with Pre-Bonding Control
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Solution Overview
Problem
There is a need for a high-quality assembling method for head-mounted see-through display systems that can accommodate the wearer's corrective ophthalmic needs and ensure optimal positioning and bonding of the light-guide optical element within a transparent capsule, while minimizing breakage and ensuring homogeneous optical functionality.
Innovation Solution
A method involving the encapsulation of a light-guide optical element in a transparent capsule, which includes steps for providing the capsule and optical element, depositing adhesive, positioning, controlling parameters, and bonding, with a control step to adjust parameters before bonding to ensure optimal alignment and bonding quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the light-guide optical element and transparent capsule are bonded using adhesive, then the bonding strength and structural integrity are improved, but the light-guide optical element is fragile and has a high breakage rate when separation is attempted
Solution Approach 1:
The patent implements a control step before the bonding step to verify parameters of the optical system formed by the light-guide optical element and transparent capsule. This preliminary verification ensures correct positioning and alignment before permanent bonding occurs, preventing the need for separation and subsequent breakage of the fragile light-guide element.
2Stability of the object's composition
If the bonding step is performed to make the light-guide optical element and transparent capsule integral, then the structural stability is improved, but it becomes very difficult to separate the components for adjustment or recovery
Solution Approach 1:
The control step is performed before bonding to verify that the optical system parameters are correct. This preliminary verification ensures that bonding only occurs when positioning is optimal, eliminating the need for later separation and adjustment, thus achieving both structural stability and ease of repair (by preventing the need for separation).
Solution Approach 2:
The control step provides feedback on the parameters of the optical system formed by the light-guide optical element and transparent capsule. This feedback mechanism ensures correct positioning before bonding, allowing verification that the components are properly aligned before making them integral, thus achieving structural stability without sacrificing the ability to correct positioning errors.
3Manufacturing precision
If the light-guide optical element is positioned precisely to ensure enhanced quality reality element, then the optical quality is improved, but the positioning precision requirements become more stringent and difficult to achieve
Solution Approach 1:
The control step measures parameters of the optical system and provides feedback on the positioning of the light-guide optical element relative to the transparent capsule. This feedback mechanism enables verification and adjustment of positioning precision without requiring overly complex positioning mechanisms, as the control step can detect and indicate positioning errors.
Solution Approach 2:
The patent replaces complex mechanical positioning mechanisms with an optical control and verification system. Instead of relying solely on mechanical precision, the control step uses optical parameter measurement to verify positioning, substituting mechanical complexity with optical measurement and feedback.
4Manufacturing precision
If a control step is added before bonding to verify optical system parameters, then the quality control and recovery capability are improved, but the manufacturing process time and complexity increase
Solution Approach 1:
The control step is performed as a preliminary verification before bonding to ensure optical system parameters are correct. This preliminary action prevents the need for rework or recovery operations after bonding, which would consume more time. By verifying parameters early, the process actually reduces total manufacturing time despite adding a control step.
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
This method ensures a high-quality, optically homogeneous bonding of the light-guide optical element and transparent capsule, reducing breakage and allowing for customization to the wearer's needs, thereby enhancing the overall performance and cosmetic and optical quality of the head-mounted see-through display system.
Implementation Method 1
an adhesive deposing step during which an adhesive is deposited on at least part of a face of the transparent capsule and/or of a face of the light-guide optical element... a bonding step during which the light-guide optical element and the transparent capsule are made integral with the adhesive
Data Source
AI summary
Method for encapsulating at least partly a light-guide optical element in a transparent capsule, the method comprising at least: —a transparent capsule providing step during which a transparent capsule is provided, —a light-guide optical element providing step during which a light-guide optical element is provided, —an adhesive deposing step during which an adhesive is deposited on at least part of a face of the transparent capsule and/or of a face of the light-guide optical element, —a positioning step during which the transparent capsule and the light-guide optical element are positioned one relative to the other so as to form an optical system, —a bonding step during which the light-guide optical element and the transparent capsule are made integral with the adhesive, wherein the method further comprises prior to the bonding step a control step during which at least one parameter of the optical system is controlled.