Semiconductor Electrode Terminal Width Variation for Bending Accuracy
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Solution Overview
Problem
Existing semiconductor devices face issues with electrode terminal strength leading to breakage and insulation failures due to inadequate bending accuracy and bulging during the bending process, particularly when the width of the bent portion is large.
Innovation Solution
The semiconductor device features electrode terminals with a root portion, a first middle portion wider than the root and tip portions, and a second middle portion with a narrower width than the first middle portion, which is bent towards an orthogonal direction, ensuring sufficient strength and preventing insulation failures and breakage by managing bulging during the bending process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the width of the bent portion of an electrode terminal is large, then bending workability is improved, but the electrode terminal easily undergoes bending deformation and insulation failure occurs between adjacent electrode terminals
Solution Approach 1:
The electrode terminal is designed with varying width along its length: a wide first middle portion for bending workability, a narrow second middle portion for insulation, and a root portion with appropriate width. This local variation in dimensional properties allows the terminal to be bent easily at the wide portion while maintaining insulation at the narrow portion.
Solution Approach 2:
The electrode terminal is segmented into distinct portions with different width characteristics: the root portion, the first middle portion (widest), the second middle portion (narrower), and the tip portion. This segmentation allows each portion to serve its specific function - bending at the first middle portion while maintaining insulation at the second middle portion.
2Manufacturing precision
If a narrow portion is provided in the electrode terminal to improve bending accuracy, then bending precision is improved, but the strength of the electrode terminal lowers and it becomes easily broken or deformed
Solution Approach 1:
The electrode terminal features localized width variation where only specific portions (first and second middle portions) have different widths, while other portions (root and tip) maintain appropriate dimensions for strength. This localized quality change achieves bending accuracy without compromising overall terminal strength.
Solution Approach 2:
The terminal is divided into segments with different width characteristics, allowing the narrow second middle portion to provide bending accuracy while the wider first middle portion and properly dimensioned root portion maintain structural strength and resist breakage.
Data Source
AI summary
A semiconductor device includes a sealing resin being an insulating resin sealing the semiconductor element therein, and a plurality of electrode terminals each including a root portion being a root protruding from the sealing resin, a tip portion being a tip and portion extending from the root portion, and a middle portion provided between the tip portion and the root portion, and the middle portion includes first middle portions having a width wider than those of the root portion and the tip portion in the first direction, and a second middle portion having a width wider than those of the root portion and the tip portion in the first direction, a width narrower than those of the first middle portions in the first direction, and a bent portion bent toward in a third direction orthogonal to the first direction and the second direction.