Eyeglass Lens Laminated Pattern Layer Scratch Resistance
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Solution Overview
Problem
Eyeglass lenses with metal pattern layers on hard coatings suffer from optical defects such as scratches and peeling, leading to decreased transmittance.
Innovation Solution
A laminated pattern layer structure on the hard layer, comprising a metal oxide layer adjacent to the hard layer, a metal layer in between, and another metal oxide layer on the surface, enhances adhesion and prevents scratches, thereby suppressing optical defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a metal layer is formed directly on a hard layer to control light incident through the substrate, then light diffraction effect is effectively obtained, but optical defects such as scratches occur leading to decreased transmittance
Solution Approach 1:
The patent introduces a metal oxide layer as an intermediary between the metal layer and the hard layer. This intermediate layer prevents direct contact between the metal and hard layer, reducing stress concentration and preventing scratches while maintaining the light diffraction effect of the metal layer.
Solution Approach 2:
The patent creates a composite structure by combining metal oxide and metal layers. This composite pattern layer structure leverages the protective properties of metal oxide and the optical properties of metal, resolving the contradiction between achieving light diffraction and preventing scratches.
2Device complexity
If a metal layer is formed directly on a hard layer, then the structure is simple, but adhesion is poor leading to peeling of the pattern layer
Solution Approach 1:
The metal oxide layer serves as a mediator that improves adhesion between the metal layer and hard layer. It provides chemical bonding sites that enhance interlayer adhesion, preventing peeling while adding only one intermediate layer to the structure.
3Illumination intensity
If a metal layer is exposed on the surface of the pattern layer, then light diffraction is maximized, but the metal layer deteriorates and scratches occur
Solution Approach 1:
The patent solves the surface exposure problem by changing the vertical dimension of the layer structure. Instead of having the metal layer exposed on the surface, it places the metal layer in the middle of the pattern layer structure, with metal oxide layers above and below it, protecting the metal from surface damage.
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 laminated structure effectively reduces the occurrence of optical defects like scratches and peeling, maintaining transmittance and durability of the eyeglass lenses.
Implementation Method 1
The metal oxide layer adjacent to the hard layer can enhance adhesion between the hard layer and the pattern layer
Implementation Method 2
a metal layer is suitable as a thin film for controlling light incident through a substrate because a light diffraction effect can be effectively obtained
Implementation Method 3
the metal oxide layer located on the uppermost surface of the pattern layer contributes to preventing deterioration of the metal layer
Data Source
AI summary
Provided is an eyeglass lens having a hard layer on a lens substrate and a pattern layer having a laminate structure in which a plurality of layers are laminated on the hard layer, wherein the pattern layer includes: a metal oxide layer laminated directly on a surface of the hard layer; a metal layer; and a metal oxide layer located at the uppermost surface of the pattern layer.