Wavelength Conversion Wiring for Direct Laser Power Cutoff
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Solution Overview
Problem
Existing light-emitting devices do not have a mechanism to directly cut off power supply to the semiconductor laser element when an abnormality occurs in the wavelength conversion portion, potentially leading to safety risks.
Innovation Solution
A light-emitting device design that includes a wavelength conversion member with a wiring region as part of the current path, where the power supply to the light-emitting element is directly cut off when an abnormality is detected in the wavelength conversion portion, using a conductive film to disconnect the current path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive film is disposed around the wavelength conversion portion to detect abnormalities, then abnormality detection capability is improved, but the response speed is insufficient because indirect control requires additional processing time
Solution Approach 1:
The patent combines the wavelength conversion portion and the conductive film into a single integrated structure. The conductive film is disposed on the wavelength conversion portion, creating a unified component that serves both wavelength conversion and abnormality detection functions. This integration eliminates the need for separate detection and control systems, enabling direct current path interruption when abnormalities occur, thus improving response speed while maintaining reliability.
2Reliability
If a separate detection mechanism is used to monitor the wavelength conversion portion, then abnormality detection is improved, but the device complexity increases due to additional components and control circuits
Solution Approach 1:
The patent merges the detection function into the existing wavelength conversion portion by integrating a conductive film that serves dual purposes: wavelength conversion and abnormality detection. This eliminates the need for separate sensors, control circuits, and processing units, thereby reducing device complexity while maintaining reliable abnormality detection capability.
Solution Approach 2:
The conductive film is designed to perform multiple functions simultaneously: it converts wavelength and detects abnormalities. This multi-functionality reduces the number of components needed in the system, simplifying the overall device structure while improving reliability through integrated monitoring.
3Reliability
If the current path is made separate from the wavelength conversion portion, then safety is improved through isolation, but the response speed decreases due to indirect control requirements
Solution Approach 1:
The patent combines the current path with the wavelength conversion portion by integrating the conductive film directly into the wavelength conversion structure. This integration allows the current path to be interrupted directly at the wavelength conversion portion when abnormalities are detected, achieving both safety through isolation and rapid response speed through direct control.
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
Ensures immediate power shutdown to the light-emitting element upon detection of an abnormality in the wavelength conversion portion, enhancing safety by preventing unintended light emission and reducing the risk of damage.
Implementation Method 1
a wavelength conversion member... configured to emit first light from an emitting end surface... The wavelength conversion member has an incident lateral surface on which the first light emitted from the light-emitting element is incident and an upper surface from which second light is emitted
Data Source
AI summary
A light-emitting device includes, a base member having a placement surface, a light-emitting element disposed on the placement surface and configured to emit light from an emitting end surface, and a wavelength conversion member disposed on the placement surface along a direction in which the light emitted from the light-emitting element travels. The wavelength conversion member includes a wiring region that is a part of a current path electrically connected to the light-emitting element.