Stem Lead Tip Curvature for Substrate Insertion
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Solution Overview
Problem
The insertability of substrates into the gap between the raised portion and the lead in a stem is reduced due to the sharp edge on the lead tip, especially when the gap is narrow, leading to worsened assemblability.
Innovation Solution
The lead tip is modified with a curved surface, such as a semi-spherical or rounded edge, or an inclined surface to widen the gap, allowing smoother insertion and attachment of the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lead is fixed to the through-hole with a narrow gap, then the structural compactness is improved, but the substrate insertability deteriorates due to the sharp edge catching on the substrate
Solution Approach 1:
The lead tip is modified with a curved surface (rounded edge) instead of a sharp edge. This curvature prevents the substrate from getting caught during insertion while maintaining a compact overall structure. The rounded tip allows the substrate to slide smoothly into the gap between the raised portion and the lead.
Solution Approach 2:
The lead tip is pre-modified with a curved surface before the substrate insertion process. This preliminary modification ensures that when the substrate is inserted, it encounters a smooth, non-catching surface from the outset, facilitating easy insertion without requiring additional adjustments during assembly.
2Ease of operation
If the lead tip is modified with a curved surface or inclined surface, then the substrate insertability is improved, but the manufacturing complexity increases
Solution Approach 1:
The lead tip geometry is modified by changing its surface parameters - specifically, introducing a curved surface or inclined surface with defined angles and radii. These parameter changes can be achieved through standard machining operations such as rounding, chamfering, or polishing, which are conventional manufacturing processes that do not significantly increase complexity.
Data Source
AI summary
A stem includes a base member that includes a main body, a raised portion raised from the top surface of the main body, and a through-hole through the main body, a lead that is inserted into the through-hole of the base member and is fixed to the through-hole with a fixing material such that one end of the lead juts out of the top surface of the main body of the base member, and a substrate that is inserted into a gap between the raised portion of the base member and one end of the lead and is attached to the raised portion to be electrically connected to the one end. The lead has a curved surface curving in a direction widening the gap into which the substrate is inserted, or an inclined surface inclined in a direction widening the gap, on a tip of the one end.