Laser Light Source Device with Cooled Reflection Diffusion Member
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Solution Overview
Problem
High-output laser light in image projectors can cause safety hazards due to direct exposure, and existing diffusion members are prone to heat-induced damage, leading to potential leaks when they break or malfunction.
Innovation Solution
A light source device incorporating a reflection and diffusion member cooled by a cooler, where the laser light is reflected and diffused twice to enhance diffusion performance and reduce thermal stress, preventing direct leakage and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a diffusion member is provided on the traveling light path of high-output laser light to relieve energy density and improve safety, then laser light safety is improved, but the diffusion member is prone to heat breaking and damage due to poor heat conductivity of glass
Solution Approach 1:
A heat-resistant member with high heat conductivity (such as metal) is introduced as an intermediary between the laser light source and the glass diffusion member. This heat-resistant member absorbs and conducts away the heat generated by the high-output laser light, preventing the glass diffusion member from overheating and breaking, thus maintaining both safety and durability
Solution Approach 2:
The system uses a composite structure combining a heat-resistant material (metal with high heat conductivity) and a glass diffusion member. The metal component handles the thermal management while the glass component provides the diffusion function, creating a synergistic system that resolves the contradiction between safety and durability
2Illumination intensity
If the diffusion member is made of glass to achieve diffusion effect, then light diffusion performance is improved, but heat breaking occurs due to very small heat conductivity of glass when irradiated with high-output laser light
Solution Approach 1:
A heat-resistant member made of material with high heat conductivity (such as metal) is placed between the laser light source and the glass diffusion member. This intermediary component absorbs the thermal load from the high-output laser light and conducts it away, allowing the glass diffusion member to maintain its light diffusion performance without suffering from heat-related damage
3Power
If laser light of high output is used to provide sufficient energy for projection, then projection brightness is improved, but direct exposure to laser light causes safety hazards to human eyes and skin
Solution Approach 1:
A diffusion member (such as a glass diffusion plate) is placed in the light path between the high-output laser source and the external environment. This diffusion member scatters the concentrated laser light, reducing the energy density and eliminating the coherent beam structure that causes retinal damage, while the heat-resistant member ensures the diffusion member can withstand the thermal load
Solution Approach 2:
The potentially harmful high-output laser light is converted into a safe diffused light source. The diffusion member transforms the dangerous coherent beam into harmless scattered light, while the heat-resistant member enables this conversion by withstanding the initial thermal conditions
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 solution effectively diffuses high-output laser light without direct exposure, ensuring safety and preventing damage to the diffusion member, thus maintaining continuous operation and safety without laser light leakage.
Implementation Method 1
a cooler that cools the reflection and diffusion member
Implementation Method 2
a diffusion member to relieve energy density of laser light
Implementation Method 3
the laser light propagates through the diffusion member, is reflected off the reflection member towards the diffusion member
Data Source
Figure 1
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Figure 5
AI summary
A light source device includes a light source section that emits laser light, a reflection and diffusion member that diffuses and reflects the laser light emitted from the light source section, and a cooler that cools the reflection and diffusion member. The cooler includes at least one of an axial fan, an electronic cooling element, and a heat pipe.