Curing High Refractive Index Lens Adhesive with Visible Light
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Solution Overview
Problem
The challenge is to effectively bond two glass lenses with high refractive indexes (1.80 or more) using an ultraviolet curing adhesive, as insufficient ultraviolet light passes through the lenses, making it difficult to fully cure the adhesive.
Innovation Solution
A method involving the use of a photo-curable resin adhesive with a photopolymerization initiator having an absorption edge wavelength of 410 nm or more, which is cured by light with a wavelength of 400 nm or more, allowing for effective bonding of the high refractive index lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ultraviolet curing adhesive is used to bond high refractive index glass lenses, then bonding strength is improved, but insufficient ultraviolet light transmission through the lenses prevents complete adhesive curing
Solution Approach 1:
The patent changes the wavelength parameter of the curing light from conventional ultraviolet (below 400 nm) to visible light (400 nm or more). This parameter change allows the light to transmit through high refractive index glass lenses that block ultraviolet light, enabling complete adhesive curing while maintaining strong bonding between the lenses
2Productivity
If conventional ultraviolet light (wavelength below 400 nm) is used for curing, then adhesive curing speed is improved, but light cannot penetrate high refractive index lenses with sufficient intensity
Solution Approach 1:
The patent changes the wavelength parameter from ultraviolet range to visible light range (400 nm or more). This allows sufficient light penetration through high refractive index glass while maintaining effective curing speed by using photopolymerization initiators specifically designed to activate at these longer wavelengths
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 approach ensures a strong adhesive bond between the lenses with high refractive indexes, achieving an internal transmittance of 99% or more in the bonding portion, thereby enhancing the optical performance and mechanical strength of the cemented lens.
Implementation Method 1
the adhesive containing a photo-curable resin and a photopolymerization initiator having an absorption edge wavelength of 410 nm or more, and bonding the first transparent base and the second transparent base by irradiating the adhesive with light with a wavelength of 400 nm or more through the second transparent base to harden the adhesive
Data Source
AI summary
A method of manufacturing an optical element includes preparing a first transparent base having a d-line refractive index of 1.80 or more and a second transparent base having a d-line refractive index of 1.80 or more, coating an adhesive on the first transparent base and/or the second transparent base, the adhesive containing a photo-curable resin and a photopolymerization initiator having an absorption edge wavelength of 410 nm or more, and bonding the first transparent base and the second transparent base by irradiating the adhesive with light with a wavelength of 400 nm or more through the second transparent base to cure the adhesive.