Optical Device Mechanical References for Lens Positioning
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Solution Overview
Problem
Existing ophthalmic lens assemblies face challenges in accurate positioning and easy integration into frames, particularly with gluing methods that require precise glue management and risk delamination due to friction.
Innovation Solution
An optical system with mechanical references on the optical device allows for accurate positioning and attachment of optical lenses, independent of the device material, minimizing friction and enabling customization, using various attachment methods such as clips, magnets, or adhesives, and incorporating features like anti-reflective coatings and air gaps for enhanced functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If gluing is used for attachment of the optical lens to the optical device, then the attachment strength is improved, but the positioning accuracy and ease of integration deteriorate due to glue management complexity
Solution Approach 1:
The attachment system is segmented into distinct functional elements: mechanical references (positioning features), attachment features (clips, magnets, or adhesive zones), and optical elements. This segmentation allows the positioning and attachment functions to be independently optimized, eliminating the need for complex glue management while maintaining strong attachment.
Solution Approach 2:
Mechanical references act as intermediaries between the optical lens and optical device, providing precise positioning without requiring direct adhesive bonding. The attachment features (clips, magnets) serve as intermediaries that provide secure attachment without the complexity of glue management, including overspread control and curing processes.
2Measurement precision
If mechanical references are added to the optical device, then the positioning accuracy is improved, but the device complexity increases
Solution Approach 1:
Mechanical references are implemented as localized features at specific positions on the optical device rather than complex systems throughout. These localized positioning features provide high positioning accuracy while adding minimal overall complexity to the device structure.
3Strength
If the optical lens is attached with friction during mounting, then the attachment strength is improved, but the optical lens edge may delaminate due to stress
Solution Approach 1:
The harmful frictional stress during attachment is eliminated by extracting it from the attachment process. Instead of relying on friction between the lens and device surfaces, the patent uses dedicated attachment features (clips, magnets, or controlled adhesive zones) that secure the lens without creating edge stress that could cause delamination.
Data Source
AI summary
A method and an optical system adapted for a wearer having an ophthalmic prescription. The optical system includes an optical device having a planar optical function, and an optical lens having an optical function based on the prescription of the wearer. The rear face of the optical device is attached to the front face of the optical lens, the optical device having at least one mechanical reference so as to allow an accurate relative position of the optical device and the optical lens.