Light-emitting device recognition target contrast via insulation layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing light-emitting devices face challenges in recognizing a mark or recognition target portion due to small differences in reflectivity between the substrate and feeder patterns, making visual or digital recognition difficult, especially when heat-dissipation and sulfur resistance are prioritized.
Innovation Solution
A light-emitting device design featuring a support body, wiring pattern, light-emitting element, recognition target portion made of conductive material, insulation layer, and a light transmissive unit with a lens portion and flange, where the insulation layer has a higher reflectivity difference with the support body than with the recognition target portion, enhancing contrast and recognition independence from wiring pattern reflectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mark is made of the same material as the feeder patterns, then heat-dissipation and sulfur resistance are improved, but the difference in reflectivity between the substrate and the mark becomes small, making visual or digital recognition difficult
Solution Approach 1:
An insulation layer is introduced as an intermediary between the substrate and the mark. This insulation layer has a reflectivity that creates a significant difference from the substrate, enabling visual and digital recognition of the mark's position. The mark itself can still be made of the same material as the feeder patterns, maintaining heat-dissipation and sulfur resistance properties, while the insulation layer provides the necessary optical contrast for recognition.
2Difficulty of detecting and measuring
If the difference in reflectivity between the substrate and the mark is increased, then visual or digital recognition is improved, but the combination of substrate and mark materials becomes more limited
Solution Approach 1:
The insulation layer serves as a mediator that decouples the optical recognition function from the material selection constraints. By placing the insulation layer between the substrate and the mark, the system achieves high reflectivity contrast for recognition purposes while allowing the mark to be made from materials optimized for heat-dissipation and sulfur resistance, thus expanding material selection versatility.
Solution Approach 2:
The insulation layer is selectively applied only in specific regions where mark recognition is needed, rather than uniformly across the entire substrate. This localized application maintains the original substrate and mark material properties in areas where they are not needed for recognition, preserving heat-dissipation and sulfur resistance characteristics while providing optical contrast only where required.
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 design allows for easy recognition of the recognition target portion, facilitating inspection, mounting, and division processes even with small reflectivity differences between the support body and wiring patterns, while maintaining good heat-dissipation and sulfur resistance.
Implementation Method 1
an insulation layer configured to reflect light emitted from the light-emitting element
Data Source
AI summary
A light-emitting device includes a support body having a quadrangle planar shape, a wiring pattern on the support body, a light-emitting element on the wiring pattern, a recognition target portion on a corner portion of the support body, the recognition target portion including a conductive material, an insulation layer reflecting light emitted from the light-emitting element and covering a periphery of the recognition target portion, and a light-transmissive member including a lens portion covering the light-emitting element and a flange portion on a periphery of the lens portion and covering a portion of the recognition target portion that is covered with the insulation layer. The portion of the recognition target portion covered by the flange portion is arranged in a non-point symmetry around a center of the support body, and a difference in reflectivity between the support body and the insulation layer is larger than between the support body and the recognition target portion.