Radiation Angle Changing Element Bonding Strength
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Solution Overview
Problem
Radiation angle changing elements face challenges in achieving strong bonding to housings due to adhesion issues between resin and ceramic materials, sensitivity to thermal shock, and limited heat resistance, particularly with high-temperature bonding methods.
Innovation Solution
A radiation angle changing element with a glass substrate and a resin layer having an optically functioning microlens array, where the resin layer is not formed on the glass substrate in the bonding portion, allowing for bonding between glass and ceramic, and optionally incorporating a metal film for enhanced bonding strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a resin microlens array is bonded to a ceramic housing, then the radiation angle can be controlled, but the bonding strength is lowered due to adhesion problems between resin and ceramic
Solution Approach 1:
A metal film is introduced as an intermediary layer between the resin microlens array and the ceramic housing. The metal film serves as a bonding intermediary that is compatible with both materials, enabling strong adhesion where direct resin-ceramic bonding fails. This mediator resolves the adhesion incompatibility between the organic resin and inorganic ceramic materials.
Solution Approach 2:
The bonding structure is designed as a composite system comprising resin microlens array + metal film + ceramic housing. This multi-material composite approach leverages the complementary properties of each material: the resin provides optical functionality, the metal film provides bonding strength and thermal stability, and the ceramic provides structural integrity and heat resistance.
2Strength
If high-temperature bonding methods are used, then bonding strength may be improved, but the resin microlens array cannot withstand temperatures of several hundred degrees
Solution Approach 1:
The bonding process is segmented into two distinct stages: (1) high-temperature bonding between the metal film and ceramic housing, and (2) low-temperature bonding between the resin microlens array and metal film. This segmentation allows each bonding interface to be optimized for its specific temperature requirements, enabling the use of high-temperature methods without exposing the resin to damaging temperatures.
Solution Approach 2:
The metal film is pre-formed on the ceramic housing before the resin microlens array is attached. This preliminary preparation creates a thermally stable bonding substrate that can withstand high-temperature processing, protecting the resin from thermal damage while still enabling strong overall bonding.
3Device complexity
If resin and ceramic are bonded directly, then the structure is simplified, but the bonding is sensitive to thermal shock due to different coefficients of thermal expansion
Solution Approach 1:
The metal film acts as a thermal expansion intermediary that buffers the mismatch between resin and ceramic coefficients of thermal expansion. This mediator layer absorbs and distributes thermal stress, preventing catastrophic failure during thermal cycling while adding only minimal structural complexity.
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 configuration enhances bonding strength and thermal shock resistance by eliminating adhesion issues between resin and ceramic, enabling secure attachment to housings while maintaining high transmittance and diffusion performance.
Implementation Method 1
radiation angle changing elements for scattering incident light in various directions or changing the angle thereof
Implementation Method 2
elements produced by distributing minute spaces or distributing microparticles inside a flat plate
Data Source
AI summary
A radiation angle changing element bonded to a housing includes: a glass substrate; and a resin layer provided on the glass substrate and having an optically functioning part. In a bonding portion bonded to the housing, the resin layer is not formed on the glass substrate.