Elastic Foil Body for Light Transmitter in Vehicle Lamp
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Solution Overview
Problem
Conventional light emitting devices with semiconductor laser light sources face issues of light-transmitting member embrittlement and breakage due to repetitive expansion and contraction caused by heat generated from the locally irradiating light, leading to potential dislodgment and reduced light output efficiency.
Innovation Solution
A light emitting device configuration that includes a base portion, a light-transmitting member fixed over a through hole, a semiconductor light emitting element to irradiate the member, an optical system for condensing and locally irradiating the member, and an elastic foil body to sandwich the member, allowing for elastic deformation and reduced stress, along with a high reflectance member to enhance light output and prevent embrittlement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light-transmitting member is firmly fixed by a fixing member to prevent falling off, then the light-transmitting member is secured in position, but the light-transmitting member and fixing member experience repeated expansion and contraction due to heat, causing embrittlement and breakage
Solution Approach 1:
The patent uses a flexible adhesive layer instead of a rigid fixing member to bond the light-transmitting member to the base portion. This adhesive layer can elastically deform to accommodate thermal expansion and contraction of the light-transmitting member, preventing stress concentration and embrittlement while maintaining secure fixation and preventing dislodgment during repeated heating cycles.
2Stability of the object's composition
If the light-transmitting member is firmly fixed to ensure stability, then positional stability is achieved, but stress concentration occurs due to thermal expansion and contraction, leading to embrittlement
Solution Approach 1:
The patent changes the mechanical properties of the bonding interface by using an adhesive layer with appropriate elasticity and compliance. This allows the bonding structure to accommodate dimensional changes in the light-transmitting member during thermal cycles, reducing stress concentration while maintaining positional stability through controlled adhesion.
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 light-transmitting member dislodgment and embrittlement, increases light output efficiency, allows for arbitrary light emission surface shaping, and improves luminance distribution by using an elastic foil body and high reflectance member to manage thermal expansion and enhance light reflection.
Implementation Method 1
the light-transmitting member 12 and the fixing member 250 experience repeated expansion and contraction because of heat generated by the locally irradiating laser light from the semiconductor laser light source
Implementation Method 2
a foil body configured to include a second through hole for light emitted from the light-transmitting member to pass through and has elasticity
Data Source
AI summary
A light emitting device can include a base portion including a surface, a back surface, and a first through hole penetrating the surface and the back surface. A light-transmitting member can be fixed to the surface so as to cover the first through hole. A semiconductor light emitting element can emit light to pass through the first through hole and for irradiating the light-transmitting member. An optical system can be provided for condensing the light from the semiconductor light emitting element and locally irradiating the light-transmitting member with the light. A foil body can be provided and can include a second through hole for light emitted from the light-transmitting member to pass through and has elasticity. The light-transmitting member can be sandwiched between the foil body around the second through hole and the base portion with part of the light-transmitting member exposed from the second through hole.