Wavelength Conversion Element Adhesion Layer Design
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Solution Overview
Problem
Current projection apparatuses face durability issues due to high operating temperatures in the phosphor wheel, where the organic silica gel adhesive burns, leading to insufficient adhesion and reduced durability of the wavelength conversion element.
Innovation Solution
A wavelength conversion element with a substrate having an adhesion zone divided into central and edge portions, using a first adhesive with lower operating temperature and higher viscosity at the edge portions and a second adhesive with higher operating temperature at the central portion, to manage heat distribution and enhance adhesion, along with a substrate material like metal for improved thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If organic silica gel is used as adhesive in the phosphor wheel, then the manufacturing cost is reduced and ease of manufacture is improved, but the adhesive burns at high temperature causing adhesion failure and durability decreases
Solution Approach 1:
The adhesion zone is divided into a central portion and two edge portions, with different adhesive materials applied to each region. The central portion uses high-temperature-resistant adhesive while edge portions use organic silica gel, allowing the structure to withstand thermal stress while maintaining manufacturing efficiency
Solution Approach 2:
Different regions of the adhesion zone are assigned different adhesive properties based on their thermal exposure. The central portion requires high-temperature resistance while edge portions benefit from the ease of application of organic silica gel, optimizing both durability and manufacturability in specific locations
2Illumination intensity
If the phosphor wheel operates at high temperature to maintain brightness, then illumination intensity is improved, but the organic silica gel adhesive burns leading to adhesion failure
Solution Approach 1:
The central portion of the adhesion zone is equipped with high-temperature-resistant adhesive material that can withstand the thermal conditions required for maintaining brightness, while edge portions use different adhesive properties
Solution Approach 2:
The high temperature that would normally cause adhesive burning is converted into a beneficial factor by using heat-resistant adhesive materials in the central portion, allowing the system to operate at optimal temperature for brightness without adhesive degradation
3Strength
If high viscosity adhesive is used at edge portions, then adhesion strength is improved, but the adhesive may fail at high temperature in the central portion
Solution Approach 1:
The adhesion zone is segmented into central and edge portions with different adhesive characteristics. Edge portions use high viscosity adhesive for strong adhesion, while the central portion uses high-temperature-resistant adhesive that maintains its properties under thermal stress
Solution Approach 2:
Different adhesive properties are assigned to different regions: high viscosity at edge portions for maximum adhesion strength, and high temperature resistance at the central portion for thermal stability
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 improves the durability and wavelength conversion efficiency of the wavelength conversion element, preventing adhesive burning and ensuring stable operation, thereby enhancing the overall durability and image quality of the projection apparatus.
Implementation Method 1
The adhesion layer is disposed on the adhesion zone, wherein the adhesion layer includes a first adhesive and a second adhesive
Implementation Method 2
along with a substrate material like metal for improved thermal conductivity
Data Source
AI summary
A wavelength conversion element includes a substrate, an adhesion layer and a wavelength conversion material. The substrate has a bearing surface having an adhesion zone. The adhesion zone has a central portion and two edge portions respectively on two sides of the central portion. The adhesion layer is disposed on the adhesion zone and includes a first adhesive and a second adhesive. The first adhesive is disposed at the edge portions. The second adhesive is disposed at the central portion. Operating temperature of the first adhesive is lower than operating temperature of the second adhesive. Viscosity of the first adhesive is larger than viscosity of the second adhesive. The wavelength conversion material is fixed on the bearing surface by the first adhesive and the second adhesive. A projection apparatus having the wavelength conversion element is provided, and the durability of the wavelength conversion element and the projection apparatus is improved.