Wavelength Conversion Device Fixing Member Design
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Solution Overview
Problem
In light source devices with rotation fluorescent plates, the phosphor layer tends to peel off the substrate due to decreased fixing force during rotation, leading to reliability issues.
Innovation Solution
A wavelength conversion device is designed with a fixing member that contacts the phosphor layer's side surface section, providing increased fixation and preventing peeling by extending to the opposite surface, thus enhancing the fixing force and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the phosphor layer is fixed only to the substrate surface, then the device structure is simple, but the fixing force decreases during rotation causing the phosphor layer to peel off
Solution Approach 1:
The fixing member extends from the substrate surface into the phosphor layer along the thickness direction (third dimension), transforming a two-dimensional surface fixation into a three-dimensional volumetric fixation. This dimensional transition enables the fixing member to engage with the phosphor layer at multiple depths, significantly increasing the fixing force and preventing peeling during rotation without substantially complicating the overall device structure.
Solution Approach 2:
The fixing member is nested within the phosphor layer, with part of the fixing member positioned inside the phosphor layer volume. This nesting arrangement allows the fixing member to be embedded in the phosphor layer while maintaining structural integrity, creating a secure mechanical interlock that prevents the phosphor layer from peeling off during rotational operation.
2Ease of manufacture
If the fixing member contacts only the top surface of the phosphor layer, then the manufacturing process is simple, but the fixing force is insufficient under rotational stress
Solution Approach 1:
The fixing member extends along the thickness direction of the phosphor layer, transitioning from surface-level contact to volumetric engagement. This dimensional change allows the fixing member to contact the phosphor layer at multiple positions through its thickness, significantly increasing the fixing force and resistance to rotational stress while maintaining manufacturing feasibility through straightforward molding or extrusion processes.
Solution Approach 2:
The fixing member is formed from a material that can be molded into a shape extending into the phosphor layer, combining structural support functionality with fixation functionality. This composite approach integrates the fixing mechanism into the overall component design, achieving both ease of manufacture (through molding) and high fixing strength (through three-dimensional engagement).
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 solution effectively prevents the phosphor layer from coming off the substrate, increasing the reliability of the illumination device and projector systems by maintaining a strong fixation even under rotational stress and heat generation from excitation light.
Implementation Method 1
The rotation fluorescent plate irradiates, while rotating a substrate on which a phosphor layer is provided, excitation light on the phosphor layer on the substrate to generate fluorescent light
Data Source
AI summary
A wavelength conversion device in which a wavelength conversion element less easily comes off a substrate. A wavelength conversion device includes a substrate capable of rotating around a rotation axis, a wavelength conversion element provided around the rotation axis on one surface side of the substrate, and a fixing member that fixes the wavelength conversion element to the substrate. The wavelength conversion element includes a first surface opposed to the one surface of the substrate, a second surface on the opposite side of the first surface, and a first side surface section that connects the first surface to the second surface. The fixing member is in contact with the first side surface section in at least a part of the first side surface section when viewed from a direction parallel to the rotation axis.