Projector Light Source Module Temperature Sensing for Optical Breakage Safety
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Solution Overview
Problem
Micro-projector devices used in automotive illumination systems face light hazards due to breakage of optical elements in the light diffusion assembly or wavelength conversion assembly, leading to unintended light leakage.
Innovation Solution
A projector device and light source module design that includes a light-emitting element, a light diffusion assembly, a first structural component, and a first temperature-sensing element. The temperature-sensing element is positioned to detect abnormal temperature rises on the structural component when an optical element breaks, triggering the immediate shutdown of the light-emitting element to prevent light hazards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If optical elements in the light diffusion assembly are used to diffuse illumination light, then light distribution is improved, but light hazards occur when elements break
Solution Approach 1:
The patent places temperature sensing elements in advance at positions corresponding to optical elements (light diffusion assembly and wavelength conversion assembly) before any breakage occurs. These sensing elements are pre-positioned to detect temperature changes that indicate broken optical elements, enabling immediate detection and response to potential light hazards.
Solution Approach 2:
The patent establishes a feedback mechanism where temperature sensing elements continuously monitor temperature at optical element positions, and when abnormal temperature rise is detected (indicating broken elements), the system sends feedback signals to control the light-emitting element to shut down, thereby preventing light hazards while maintaining normal illumination function.
2Reliability
If temperature-sensing elements are added to detect breakage, then safety is improved, but device complexity increases
Solution Approach 1:
The patent makes the structural components serve multiple functions: they act as both structural support elements and as mounting bases for temperature sensing elements. The control element serves dual purposes by both controlling the light-emitting element and receiving temperature detection signals. This multi-functionality reduces the need for separate dedicated safety 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
Effectively prevents light hazards by immediately turning off the light-emitting element when an optical element breaks, thereby ensuring safety and maintaining proper light distribution in automotive illumination systems.
Implementation Method 1
a first temperature-sensing element disposed on the first structural component and corresponding to the light diffusion assembly
Data Source
AI summary
A projector includes a light source module, a light valve, and a projecting lens. The light source module includes a light-emitting element, a light diffusion assembly, a first structural component, and a first temperature-sensing element. The light-emitting element is adapted to emit an illumination light beam. The light diffusion assembly is adapted to diffuse the illumination light beam. The light diffusion assembly has a front end and a rear end opposite to each other, the front end of the light diffusion assembly faces the light-emitting element, and the rear end of the light diffusion assembly faces the first structural component. The first temperature-sensing element is disposed on the first structural component and corresponds to the light diffusion assembly. The light valve is adapted to convert the illumination light beam from the light source module into an image light beam. The projecting lens is adapted to project the image light beam.