Trapezoidal Alignment Mark in Multilayer Electronic Components
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Solution Overview
Problem
In electronic components with low translucency insulating base materials, accurately detecting the alignment mark is challenging due to scattering light from the edges and upper surfaces, making it difficult to achieve precise positioning during mounting.
Innovation Solution
A multilayer body configuration with a trapezoidal-shaped alignment mark, where one insulating base material has higher translucency than the other, and the alignment mark is formed using the same material as the conductor pattern, reducing scattering and enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating base materials with low translucency are used, then manufacturing cost is reduced, but alignment mark detection accuracy deteriorates due to scattering light from edges and upper surfaces
Solution Approach 1:
The alignment mark is designed with an asymmetric cross-sectional shape where the width at the first main surface is larger than the width at the second main surface. This asymmetric geometry causes light incident from the first main surface to reflect primarily toward the second main surface, preventing scattered light from reaching the image sensor and improving detection accuracy
Solution Approach 2:
The insulating base materials are designed with different translucency properties in different regions: the first layer area has higher translucency to allow light transmission and reduce scattering, while the second layer area has lower translucency. This local differentiation of optical properties optimizes both detection accuracy and manufacturing considerations
2Ease of operation
If the alignment mark is formed on the surface of the electronic component, then detection is simplified, but resistance to external forces such as collision and friction deteriorates
Solution Approach 1:
The alignment mark is nested within the multilayer body structure, specifically formed on an insulating base material that is laminated between other insulating base materials. This nesting provides mechanical protection against external forces while the transparent or translucent properties allow optical detection to remain effective
Solution Approach 2:
The insulating base material containing the alignment mark is positioned strategically within the multilayer structure with specific optical properties (transparent or translucent) that enable detection while the overall multilayer construction provides mechanical strength and protection
3Measurement precision
If a separate special material is used for the alignment mark, then detection accuracy is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The alignment mark is merged with the conductor pattern, both being formed from the same conductor material on the same insulating base material. This integration eliminates the need for separate alignment mark materials and simplifies the manufacturing process while maintaining detection accuracy through the conductor pattern's optical contrast
Solution Approach 2:
The conductor pattern serves dual functions: as part of the electrical circuit and as the alignment mark for detection. This multi-functionality reduces manufacturing complexity by eliminating dedicated alignment mark structures while maintaining positioning accuracy
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 accuracy of alignment mark detection and provides high resistance to external forces, facilitating precise positioning and reducing manufacturing costs by eliminating the need for special alignment mark materials.
Implementation Method 1
light is reflected at the edges of a side surface and an upper surface of the alignment mark... scattered light from the edges and upper surfaces
Data Source
AI summary
An electronic component includes a multilayer body including insulating base materials laminated on each other and including first and second main surfaces perpendicular or substantially perpendicular to a lamination direction, and an alignment mark is defined by a conductor on one of the insulating base materials. The multilayer body includes a first layer area at a side of the first main surface and a second layer area at a side of the second main surface with respect to the alignment mark. An insulating base material in the first layer area has higher translucency than an insulating base material in the second layer area. The alignment mark is a trapezoidal cross-sectional shape including a first base at the side of the first main surface and a second base at the side of second main surface, the first base being longer than the second base.