Eyewear Lens Coupling Angled Surfaces Friction Fit
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Solution Overview
Problem
Antiballistic eyewear lenses are difficult to insert into frames, often resulting in optical distortion and damage during assembly or use, due to the high force required and improper fitting, which compromises their functionality.
Innovation Solution
The design incorporates a metal frame with a lens-receiving region featuring angled surfaces and a lens with corresponding peripheral edges to form a secure friction fit, ensuring the lens is securely retained without excessive strain, thereby reducing optical distortion and enhancing durability to withstand ballistic impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high force is applied to insert the lens into the frame, then the lens can be securely retained, but the lens undergoes optical distortion and damage
Solution Approach 1:
The lens insertion interface is segmented into multiple surfaces: a first insertion surface on the lens, a second insertion surface in the frame, and a third retention surface. This segmentation allows the insertion force to be distributed across different stages and locations, reducing peak stresses on the lens while ensuring secure retention.
Solution Approach 2:
The frame's second insertion surface is configured to receive the lens's first insertion surface at an angled orientation during assembly. This preliminary angled reception guides the lens into position before final retention engagement, allowing controlled insertion without requiring excessive force that would distort the lens.
2Stability of the object's composition
If the frame compresses or twists the lenses during assembly, then the lenses can be retained by the frame, but the lenses become distorted and damaged
Solution Approach 1:
Different surfaces of the lens and frame are given different geometric properties tailored to their specific functions. The first insertion surface has a curvature matching the second insertion surface for guided insertion, while the third retention surface has a different geometry optimized for secure holding. This local differentiation allows each surface to perform its function without causing distortion to other parts of the lens.
Solution Approach 2:
The lens and frame connection structure features asymmetric surface orientations and angles. The first insertion surface is angled relative to the lens optical axis, the second insertion surface in the frame is angled to receive it, and the third retention surface has a different orientation. This asymmetric design enables controlled insertion and secure retention while minimizing compressive and twisting forces on the lens.
3Reliability
If a secure friction fit is used to retain the lens, then the lens is securely held without dislodgment, but excessive strain may still occur during assembly
Solution Approach 1:
The lens retention mechanism transitions from a single-dimension press-fit approach to a multi-dimensional engagement system. The lens engages the frame through multiple surfaces at different orientations and angles, distributing the retention forces across multiple degrees of freedom. This reduces the force required in any single direction while maintaining overall secure retention.
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 eyewear effectively prevents lens dislodgment and distortion, maintaining optical quality and providing high-level ballistic protection by securely coupling the lens to the frame, meeting standards such as MIL-PRF-32432A and ANSI Z87.1.
Implementation Method 1
a peripheral edge of a lens can comprise one or more of the following features: a front wall comprising a front connection surface being configured to interact with a rear connection surface of a front wall of a frame, a middle wall being configured to interact with a middle wall of a frame, and a rear wall comprising a rear connection surface being configured to interact with a front connection surface of a rear wall of a frame
Data Source
AI summary
An eyewear lens coupling system and methods can be used during assembly of an eyewear. The system and methods may advantageously decrease optical distortion of the lens during assembly and use and/or may also advantageously increase retention of the lens to the eyewear frame to improve the overall quality of the eyewear.