Sleeve Flange Structure for Accurate Terminal Hole Center Detection
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Solution Overview
Problem
In semiconductor devices, the center position of a sleeve's hole is often deviated due to surface irregularities and shadows created during image acquisition, leading to incorrect insertion of external terminals, which can result in inclination, damage, or insertion failure.
Innovation Solution
The semiconductor device incorporates a sleeve with flanges featuring protrusions and recesses that extend radially from the hole, providing a stable posture during soldering and minimizing shadow effects, allowing for accurate image recognition and precise detection of the hole's center position, thereby preventing external terminal inclination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If surface irregularities are formed in the flange end face for soldering, then soldering stability is improved, but image recognition accuracy deteriorates due to shadows and deviations
Solution Approach 1:
The flange end face is segmented into multiple regions: a flat portion for accurate image recognition and center position detection, and irregular portions (protrusions and recesses) for soldering stability. This segmentation allows each region to fulfill its specific function without interfering with the other.
Solution Approach 2:
Different regions of the flange end face are given different surface qualities: the central flat portion maintains a smooth surface for accurate optical detection, while the peripheral regions incorporate protrusions and recesses to provide soldering stability and prevent displacement during the soldering process.
2Productivity
If automatic insertion machine is used for external terminal insertion, then productivity is improved, but insertion accuracy deteriorates when center position is deviated
Solution Approach 1:
The flat portion is provided in advance on the flange end face to enable accurate image acquisition and center position detection before the automatic insertion process. This preliminary accurate detection ensures that the automatic insertion machine can correctly position the external terminal without deviation.
3Ease of manufacture
If flange design is simplified, then manufacturing cost is reduced, but image recognition accuracy may be affected
Solution Approach 1:
The flange is segmented into a flat detection portion and irregular soldering portions, allowing the use of simple, cost-effective manufacturing processes for each region while maintaining both detection accuracy and soldering functionality.
Solution Approach 2:
Only the necessary central region is maintained flat for image recognition, while the peripheral regions can be formed with protrusions and recesses through standard manufacturing processes, balancing manufacturing simplicity with detection accuracy.
Data Source
AI summary
A sleeve is disposed on a conductive layer of an insulated circuit substrate of a semiconductor device, and includes a cylindrical portion with a through hole and a flange provided at an one end of the cylindrical portion. The flange includes a plurality of protrusions and a plurality of recesses that each extend a radial direction of the cylindrical portion from the opening edge of the through hole to an outer circumferential periphery of the flange, and are disposed alternate with one another in a circumferential direction of the flange. Each protrusion has a top surface and each recess has a bottom surface that are continuous with the opening edge of the through hole so as to each have a single flat surface parallel to the radial direction.