Laser Light Source Thermal Control for Brightness Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Image display, monitor, and lighting devices using laser beam sources face issues with rapid output power drop due to increased temperatures, leading to shortened service life and unstable operation.
Innovation Solution
A light source device with a temperature sensor and controller that adjusts the power supplied to the laser beam source, reducing power when temperatures exceed a threshold to prevent overheating and maintain output brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the laser beam source operates at high power, then the brightness output is improved, but the temperature increases causing rapid output power drop and shortened service life
Solution Approach 1:
The patent implements a feedback control system where a temperature sensor continuously monitors the laser beam source temperature and feeds this information to a controller. The controller adjusts the power supplied to the laser beam source based on the temperature feedback, reducing power when temperature exceeds a predetermined threshold. This closed-loop feedback mechanism prevents temperature-induced output power drop and extends service life while maintaining optimal brightness output.
2Illumination intensity
If the laser beam source operates at high temperature, then the initial brightness output is maintained, but the output power drops rapidly over time
Solution Approach 1:
The patent employs preliminary action by proactively monitoring the temperature of the laser beam source before thermal degradation occurs. The temperature sensor detects temperature changes in advance, and the controller preemptively reduces power supply when the temperature approaches the predetermined threshold. This preliminary intervention prevents the rapid output power drop that would otherwise occur at high temperatures, thereby extending the stable operation period while maintaining brightness output.
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
Prevents sudden decreases in output power and extends the service life of laser beam sources by controlling temperature and maintaining stable brightness, even in high-temperature environments or with cooling device failures.
Implementation Method 1
an acquirer that acquires the temperature of the light source
Implementation Method 2
a light source that emits a laser beam
Implementation Method 3
a laser beam source that emits laser beams
Implementation Method 4
a driving circuit that supplies electric power for driving the light source
Data Source
AI summary
The controller 170 controls the output power of the semiconductor laser device 100a depending on the temperature of the semiconductor laser device 100a acquired by the temperature sensor 130. The controller 170 references the correspondence table 510 when the sensor temperature Ts is obtained, obtains the output power PWs corresponding to the sensor temperature Ts, and controls the power supply driving circuit 150a so that the output power per unit time of the semiconductor laser device 100a will be the output power PWs. Thus increase in temperature of the semiconductor laser device is able to be prevented through reducing the output power by controlling the amount of power supplied to the semiconductor laser device. As a result, it is possible to prevent reductions in the service life of the semiconductor laser device, even when there is a failure in a cooling device that cools the semiconductor laser device, and even when the device is used in a high temperature environment not envisioned at the time of manufacturing.