Lighting System Sequential Inspection for Anomaly Detection
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Solution Overview
Problem
Existing lighting systems using semiconductor light-emitting devices cannot individually detect anomalies in semiconductor laser devices and light guide members, complicating the configuration with additional photodetectors.
Innovation Solution
A lighting system with a light source, wavelength conversion member, optical system, and optical sensor that uses a monitor signal to inspect each light-emitting device and optical system sequentially, allowing for individual anomaly detection without increasing system complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional photodetectors are added to detect anomalies in semiconductor laser devices, then anomaly detection capability is improved, but device complexity increases
Solution Approach 1:
The patent makes the existing photodetector perform multiple functions: it detects both the light from semiconductor laser devices during light source inspection and the light from the light guide member during optical system inspection. By controlling the inspection sequence and using the same photodetector for different detection purposes at different times, the system achieves comprehensive anomaly detection without adding additional photodetectors, thus resolving the contradiction between detection capability and system complexity
Solution Approach 2:
The patent implements periodic switching between light source inspection and optical system inspection modes. The inspection controller alternates between inspecting semiconductor laser devices and inspecting the light guide member, allowing the single photodetector to serve both purposes sequentially. This periodic action enables comprehensive monitoring while maintaining a simple system configuration
2Reliability
If light source inspection is performed continuously without suspension, then inspection completeness is improved, but optical system anomaly detection is delayed
Solution Approach 1:
The inspection controller periodically switches between light source inspection and optical system inspection, ensuring that both inspection types are performed regularly. This periodic action prevents continuous light source inspection from delaying optical system anomaly detection, while maintaining comprehensive inspection coverage through systematic alternation between the two inspection modes
Solution Approach 2:
The system performs preliminary inspection setup by configuring the inspection controller to manage the sequence of inspections. Before actual inspection begins, the controller is programmed to alternate between light source and optical system inspection, ensuring that optical system inspection is not delayed by continuous light source inspection. This preliminary configuration ensures timely detection of both types of anomalies
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
Enables simplified configuration for detecting anomalies in light-emitting devices and optical systems, ensuring efficient operation by suspending light source inspection to perform optical system inspection without delaying anomaly detection.
Implementation Method 1
a wavelength conversion member (4a) that converts part of the first light into second light (yellow light) having a different wavelength from a wavelength of the first light
Implementation Method 2
an optical sensor (53) that receives part of the second light as monitor light (L3) and outputs a monitor signal (Y1) corresponding to an intensity of the second light
Data Source
AI summary
Lighting system includes light source that includes a plurality of light-emitting devices and emits first light; wavelength conversion member that converts part of the first light into second light; an optical system that applies the first light to wavelength conversion member; optical sensor that output monitor signal corresponding to the intensity of the second light; and output control circuit that controls light source and optical sensor. Output control circuit performs a light source inspection of a condition of light source and an optical system inspection of conditions of the optical system and wavelength conversion member in accordance with monitor signal. In the light source inspection, the output control circuit inspects each of light-emitting devices in sequence, and after having inspected one of light-emitting devices, suspends the light source inspection and performs the optical system inspection before inspection of another one of the light emitting devices.