Angled Lens Edge Geometry for Invisible Rimless Spectacles
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Solution Overview
Problem
Conventional frame-less glasses have visible lens edges that interrupt the continuity of the viewed scene and continuously remind the wearer they are wearing glasses, especially in sports or activities requiring an uninterrupted field of view.
Innovation Solution
A lens design with an angled peripheral edge that is machined at a specific angle to be completely within an invisible zone, ensuring the edge is not visible to the wearer, achieved by calculating and adjusting the edge angle based on distances A and B from the eye to the lens rim, using existing machining equipment and techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If frame-less spectacles are used to minimize appearance, then the visibility of the frame is reduced, but the lens edge becomes visible and creates distraction in peripheral vision
Solution Approach 1:
The patent applies different surface treatments to different parts of the lens. The peripheral edge region receives an anti-reflective coating while the central optical zone maintains standard properties. This local differentiation eliminates the distracting lens edge ring effect without compromising overall optical performance or aesthetic appearance.
2Object-affected harmful factors
If the lens edge is polished or treated to reduce visibility, then reflections are minimized, but the structural integrity and strength of the lens edge may be compromised
Solution Approach 1:
The patent modifies the physical-chemical parameters of the lens edge surface by applying an anti-reflective coating with specific optical properties. This coating changes the refractive index and surface characteristics to minimize reflections while maintaining the underlying structural integrity of the lens edge.
3Ease of manufacture
If the lens edge is made thinner to reduce visibility, then the aesthetic appearance improves, but the lens becomes more susceptible to damage and stress
Solution Approach 1:
The patent applies protective and aesthetic treatments specifically to the peripheral edge region where the thickness transition occurs. This localized treatment enhances the appearance and protective properties of the thinnest parts of the lens without requiring the entire lens to be thicker, thus maintaining overall durability.
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 lens edge is concealed from both the wearer and onlookers, providing an uninterrupted field of view and a relaxing user experience, minimizing reflections and edge visibility even in extreme lighting conditions.
Implementation Method 1
an invisible zone created between the lines of sight P that pass the inner peripheral rim, and the lines of sight P1 refracted at the peripheral rim through the lens
Data Source
AI summary
There is provided a lens for use in frame-less spectacles, the lens body comprising an essentially flat angled peripheral edge joining inner and outer peripheral rims; the angled peripheral rim having an internal surface inside the lens body and an external surface defining an outside of the lens body. A junction between the angled peripheral edge and the inner lens surface forms a cleanly machined vertex at the inner peripheral rim. A junction of the angled peripheral edge and the outer lens surface forms a vertex sufficiently radiused to remove a sharp edge at the outer peripheral rim. An invisible zone is created between the lines of sight P that pass the inner peripheral rim, and the lines of sight P1 refracted at the peripheral rim through the lens. In use, the internal surface and external surface of the angled peripheral edge of the lens body and the outer peripheral rim are within the invisible zone and are therefore not visible to the user.