Laser Light Module Shutdown Circuit for Converter Damage Detection
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Solution Overview
Problem
Existing light-emitting modules with laser diodes face issues in reliably terminating lasing when the converting member is damaged, potentially leading to laser light leakage that can harm human eyes.
Innovation Solution
A light-emitting module design that includes a laser element, a coherence-reducing converting member, a sense wiring, and an electric potential determining circuit with comparators to control switching elements, ensuring reliable termination of lasing by monitoring the sense wiring's electric potential and switching the laser element on or off accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stop system is implemented to terminate lasing when the converting member is damaged, then safety is improved, but the complexity of the control circuit increases
Solution Approach 1:
The patent implements a stop system that proactively terminates lasing before damage can occur. The control circuit continuously monitors the state of the converting member and preemptively stops the laser diode when damage is detected, preventing potential safety hazards rather than reacting after damage occurs.
Solution Approach 2:
The control circuit incorporates feedback mechanisms that monitor the state of the converting member and adjust the lasing operation accordingly. When the converting member is detected as damaged, the feedback signal triggers the stop system to terminate lasing, creating a closed-loop safety mechanism that responds to real-time conditions.
2Device complexity
If the control circuit is simplified to reduce complexity, then device complexity is reduced, but the reliability of lasing termination may be compromised
Solution Approach 1:
The patent extracts the essential safety function from a potentially complex control system by focusing on the critical monitoring and stopping mechanisms. The control circuit is designed to perform only the necessary functions of detecting converting member damage and terminating lasing, removing unnecessary complexity while maintaining reliability through targeted safety features.
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 module effectively stops laser light emission when the converting member is damaged, preventing leakage and ensuring safety by maintaining lasing termination even with circuit element failures, thus enhancing safety in applications like vehicular headlamps.
Implementation Method 1
a laser element (14) configured to emit a laser light (L0)
Implementation Method 2
a converting member (22) configured to reduce coherence of the laser light (L0)
Data Source
AI summary
A light-emitting module including: a laser element; a converting member; a sense wiring; an electric potential determining circuit configured to output a first value when an electric potential at a first end of the sense wiring is in a predetermined range, and to output a second value when the electric potential at the first end of the sense wiring is out of the predetermined range; a first switching element electrically connected in series to the laser element, the first switching element configured to become conductive when the output is the first value, and to become non-conductive when the output is the second value; and a second switching element electrically connected in parallel to a circuit comprising the laser element and the first switching element, the second switching element configured to become conductive when the output is the second value, and to become non-conductive when the output is the first value.