Optical Member Wiring Across Ceramic Boundary for Laser Leak Detection
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Solution Overview
Problem
Existing light emitting devices using laser elements face challenges in detecting cracks or displacement of fluorescent material plates, particularly at the boundary portions with holding members, leading to insufficient prevention of laser light leakage.
Innovation Solution
An optical member comprising a conversion member with a fluorescent material, a light-reflecting ceramic holding member, a continuous surface with a light-transmissive film, and wiring extending along the surface to detect defects and prevent laser light leakage, including a laser element to irradiate the conversion member and a detection circuit to monitor the wiring's resistance for breakages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an electrically conductive thin wire or track is formed on the fluorescent material plate surface, then cracks in the fluorescent material plate can be detected, but cracks in the vicinity of the boundary portion between the fluorescent material plate and holding member cannot be detected
Solution Approach 1:
The patent extends the detection system from a two-dimensional surface (conductive wire on fluorescent plate) to a three-dimensional continuous structure by forming conductive wiring on both the fluorescent material plate and the holding member, connected through a light-transmissive film at the boundary. This dimensional extension enables detection of cracks at the previously undetectable boundary portion.
2Measurement precision
If the fluorescent material plate is displaced during use, then no defect is detected unless the displacement causes breakage of the wire, but laser light leakage may occur without wire breakage
Solution Approach 1:
The patent implements preliminary detection by forming a continuous conductive wiring structure that spans across the boundary between the fluorescent material plate and holding member before any defect occurs. This preliminary continuous structure enables detection of displacement and cracks at any stage, not just when wire breakage occurs, by monitoring changes in electrical continuity along the entire path including the boundary region.
3Measurement precision
If a continuous conductive structure is formed across the boundary, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The light-transmissive film serves multiple functions: it acts as a substrate for forming the conductive wiring that connects the fluorescent material plate to the holding member, provides mechanical support for the wiring at the boundary, and maintains optical transparency to allow laser light transmission. This multi-functionality reduces the need for separate components, thereby limiting the increase in device 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
The solution enables more accurate detection of defects that may cause laser light leakage, ensuring the integrity of the light emitting device by preventing light leakage and allowing for downsizing of the conversion member to enhance brightness.
Implementation Method 1
a conversion member including a fluorescent material
Implementation Method 2
a light reflecting ceramic holding the conversion member
Data Source
AI summary
An optical member includes: a conversion member including a fluorescent material; a light reflecting ceramic holding the conversion member, the conversion member and the light reflecting ceramic having a continuous surface; a light-transmissive film on the continuous surface; and a wiring on the light-transmissive film.