Semiconductor Terminal Positioning via Protrusion Recess Alignment
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Solution Overview
Problem
Conventional semiconductor devices face challenges in accurately positioning main terminals due to variations in assembly, leading to inconsistent connections and potential mechanical instability during assembly and operation.
Innovation Solution
The semiconductor device incorporates a terminal portion with a through hole and a casing portion featuring a depression and protruding portions, allowing for precise alignment and secure fixation of the terminal portion, including a tapered end surface protruding portion and side surface protruding portions, which facilitate accurate positioning and enhanced mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a clearance is provided between the resin case and the main terminals to facilitate assembly, then assembly ease is improved, but positioning precision deteriorates
Solution Approach 1:
The patent introduces an insertion portion as an intermediary component between the resin case and the main terminal. This insertion portion includes positioning protrusions that fit into corresponding positioning recesses, providing precise positioning while still allowing for assembly clearance. The intermediary structure mediates between the conflicting requirements of assembly ease and positioning precision.
Solution Approach 2:
The terminal structure is segmented into multiple functional parts: the main terminal body, the insertion portion with positioning protrusions, and the resin case with positioning recesses. This segmentation allows each component to fulfill its specific function - the insertion portion handles positioning while the main terminal handles electrical connection, resolving the contradiction between assembly ease and positioning precision.
2Ease of manufacture
If main terminals are fixed to external bus bars during assembly, then electrical connection is established, but mechanical stability deteriorates due to position variations
Solution Approach 1:
The positioning protrusions and recesses are pre-formed during the molding process, establishing the precise geometric relationship between components before assembly. This preliminary action ensures that when the main terminal is assembled to the bus bar, the positioning features are already in place to maintain mechanical stability, preventing position variations during operation.
Solution Approach 2:
The patent changes the geometric parameters of the terminal structure by adding positioning protrusions with specific dimensions and orientations. These parameter changes create mechanical constraints that prevent relative movement between the terminal and the resin case, thereby improving mechanical stability while maintaining assembly capability.
3Adaptability or versatility
If relative positions of main terminals to the resin case vary during assembly, then assembly flexibility is improved, but connection consistency deteriorates
Solution Approach 1:
The positioning protrusions are designed with asymmetric geometries that provide specific orientation and positioning functions. The asymmetric shapes ensure that components can only be assembled in the correct orientation, providing connection consistency while still allowing assembly flexibility through the clearance design. The asymmetric features prevent incorrect assembly while maintaining ease of correct assembly.
Data Source
AI summary
A semiconductor device is provided. The semiconductor device includes a terminal portion and a casing portion. The terminal portion has a through hole in a principal surface portion. The casing portion has a depression at a position facing the through hole and has an end surface facing portion facing an end surface of the terminal portion. An end surface protruding portion is provided on at least one of the end surface and the end surface facing portion.