Chip Part Light Diffusion Reflection Structure
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Solution Overview
Problem
Existing chip parts with mirrored outer surfaces experience biases in light reflection direction during external appearance inspections, leading to variations in color and tint, which hinder smooth quality determination.
Innovation Solution
A chip part with a substrate featuring a light diffusion reflection structure on its second main surface, formed by roughening the surface with recesses and protrusions, diffusely reflects light to minimize reflection direction biases and color variations during inspections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the substrate has a mirrored outer surface, then the appearance is smooth and uniform, but light reflection direction biases occur during inspection causing color and tint variations
Solution Approach 1:
The patent applies asymmetry by transitioning from a symmetric mirrored surface to an asymmetric roughened surface with random micro-irregularities. This asymmetric structure scatters light in multiple directions rather than reflecting it uniformly, eliminating the directional bias that causes color variations during inspection.
Solution Approach 2:
The patent introduces micro-curvature to the surface by creating a roughened structure with numerous small protrusions and recesses. This curvature at the micro-scale diffuses light reflection, preventing the uniform directional reflection characteristic of flat mirrored surfaces and thereby resolving the inspection accuracy issue.
2Measurement precision
If a light diffusion reflection structure is formed on the substrate, then light reflection consistency is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent changes the surface parameter from smooth to roughened by controlling the degree of roughness within specific ranges (arithmetic mean roughness Ra of 0.1-10 μm). This parameter change achieves light diffusion while maintaining compatibility with existing manufacturing processes, avoiding excessive complexity.
Solution Approach 2:
The patent replaces complex mechanical light diffusion structures with a simpler surface treatment approach. Instead of incorporating bulky light-diffusing components, the invention uses surface roughening treatment that achieves the same optical effect through material surface modification, thereby reducing overall 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
The chip part ensures consistent light reflection, allowing for accurate quality determination by reducing visual color changes, thus enabling smooth external appearance inspections.
Implementation Method 1
a light diffusion reflection structure formed at a second main surface side of the substrate and diffusely reflecting light irradiated toward the second main surface of the substrate
Data Source
AI summary
A chip part includes a substrate having a first main surface on one side thereof and a second main surface on the other side thereof, a functional device famed at a first main surface side of the substrate, an external terminal formed at the first main surface side of the substrate and electrically connected to the functional device, and a light diffusion reflection structure formed at a second main surface side of the substrate and diffusely reflecting light irradiated toward the second main surface of the substrate.