Optical Laminate With Double-Sided Adhesive for Vibration Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In on-vehicle applications, the integration of optical members using a low-refractive index layer is prone to breakage due to vibration, as the layer is porous and lacks strength.
Innovation Solution
An optical laminate with pressure-sensitive adhesive layers on both surfaces, featuring a low-refractive index layer with high porosity and specific storage modulus of elasticity for the adhesive layers, which includes a soft outermost layer to absorb vibrations and prevent breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a low-refractive index layer with high porosity is used to improve light utilization efficiency, then light extraction efficiency is improved, but the layer becomes poor in strength and breaks under vibration
Solution Approach 1:
The patent applies composite materials by combining the low-refractive index layer (with high porosity for light extraction) with pressure-sensitive adhesive layers (with appropriate storage modulus for strength). This composite structure allows the low-refractive index layer to maintain its optical properties while the adhesive layers provide mechanical strength to prevent breakage under vibration in on-vehicle applications.
2Use of energy by moving object
If the porosity of the low-refractive index layer is increased to improve light extraction, then light utilization efficiency is improved, but the layer becomes more susceptible to breakage
Solution Approach 1:
The patent creates a composite laminate structure where the low-refractive index layer with high porosity (40 vol% or more) is combined with pressure-sensitive adhesive layers. The adhesive layers with controlled storage modulus provide the necessary mechanical strength and reliability, allowing the porous low-refractive index layer to maintain its light extraction efficiency without being prone to breakage.
3Volume of moving object
If optical members are integrated to reduce space, then space between members is reduced, but vibration resistance decreases
Solution Approach 1:
The patent merges multiple optical members (light guide plate and peripheral optical members) into an integrated optical laminate structure. The pressure-sensitive adhesive layers with controlled storage modulus serve as bonding interfaces that maintain vibration resistance even in the integrated structure, allowing space reduction while preserving reliability.
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 laminate maintains excellent low-refractive index characteristics while preventing breakage of the low-refractive index layer under vehicle vibrations, ensuring durability and effective light utilization.
Implementation Method 1
the first pressure-sensitive adhesive layer has a storage modulus of elasticity at 23° C. of from 1.0×10^5 (Pa) to 1.0×10^7 (Pa)
Implementation Method 2
the second pressure-sensitive adhesive layer has a storage modulus of elasticity at 23° C. of 1.0×10^5 (Pa) or less; when the second pressure-sensitive adhesive layer is arranged outside the first pressure-sensitive adhesive layer, the second pressure-sensitive adhesive layer is free from being arranged adjacent to the first pressure-sensitive adhesive layer
Data Source
AI summary
An optical laminate includes: a low-refractive index layer; a first pressure-sensitive adhesive layer arranged adjacent to the low-refractive index layer; and a second pressure-sensitive adhesive layer serving as one outermost layer. The low-refractive index layer has a porosity of 40 vol % or more; the first pressure-sensitive adhesive layer has a storage modulus of elasticity at 23° C. of from 1.0×105 (Pa) to 1.0×107 (Pa); the second pressure-sensitive adhesive layer has a storage modulus of elasticity at 23° C. of 1.0×105 (Pa) or less; a ratio of a thickness of the low-refractive index layer to a total thickness of the pressure-sensitive adhesive layers present in the optical laminate with pressure-sensitive adhesive layers on both surfaces is from 0.10% to 5.00%; and, when the second pressure-sensitive adhesive layer is arranged outside the first pressure-sensitive adhesive layer, the second pressure-sensitive adhesive layer is free from being arranged adjacent to the first pressure-sensitive adhesive layer.