Lighting Device Substrate Adhesion via Connection Sections
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Solution Overview
Problem
Lighting devices for moving bodies, such as vehicles, face challenges with adhesion strength between substrates and body sections due to vibration and thermal stress, particularly in extreme temperature variations, leading to potential peeling of the substrate.
Innovation Solution
The lighting device incorporates a substrate with connection sections on its side surface, an adhesive section that covers these sections, and a body section with inclined and concave surfaces, increasing the contact area and mechanical connection to enhance adhesion strength and resistance to peeling forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a substrate is bonded to a body section in a lighting device for a moving body, then the lighting device can be assembled and function, but the substrate peels off due to vibration and thermal stress
Solution Approach 1:
The side surface of the substrate is divided into multiple connection sections (first, second, third connection sections) with different adhesion strengths. This segmentation allows each section to be optimized for its specific function, with stronger adhesion in areas experiencing higher stress and weaker adhesion in areas where thermal expansion/contraction occurs, thereby improving overall reliability under vibration and thermal stress
Solution Approach 2:
Different regions of the substrate's side surface are given different adhesion characteristics. The first connection section has stronger adhesion to resist vibration, while the second and third connection sections have weaker adhesion to accommodate thermal deformation. This local differentiation of adhesion quality prevents peeling while managing thermal stress
2Ease of manufacture
If the adhesive section covers only part of the connection sections, then manufacturing is simplified, but adhesion strength is reduced
Solution Approach 1:
The adhesive section is selectively applied to specific connection sections based on their adhesion strength requirements. The first connection section (requiring stronger adhesion) receives adhesive coverage, while the second and third connection sections (requiring weaker adhesion for thermal accommodation) may have reduced or no adhesive coverage. This localized adhesive application maintains necessary strength while simplifying manufacturing
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
This configuration improves the adhesion strength between the substrate and body section, effectively resisting vibration and thermal stress, even with reduced surface area coverage, thereby enhancing the reliability of the lighting device across varying temperatures.
Implementation Method 1
an adhesive section that covers at least a part of the plurality of connection sections
Implementation Method 2
a physical bonding such as van der Waals force or a chemical bonding can be increased
Implementation Method 3
since a part of the adhesive section can enter the inside of the connection sections, it is possible to increase mechanical connection
Data Source
AI summary
A lighting device for a moving body includes a substrate that has a base body having connection sections on a side surface and a wiring pattern provided on at least one main surface of the base body. The moving body further includes a light emitting element that is electrically connected to the wiring pattern, and an adhesive section that is provided between the base body and a body section. The connection sections are at least one of groove sections, concave sections, and convex sections, while the adhesive section covers at least a part of the plurality of connection sections.