Semiconductor Control Terminal Blocking Section Design
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Solution Overview
Problem
Conventional semiconductor devices face issues with mechanical strength and dimensional accuracy due to gaps formed between control terminals and the resin case under compressive loads, leading to potential damage to the wiring substrate and circuit patterns.
Innovation Solution
A semiconductor device design featuring a control terminal with a cut-out section and a blocking section that is bent to accommodate pressure, ensuring the blocking section contacts the case and prevents movement, thereby reducing gaps and enhancing mechanical strength and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional control terminal design is used without a blocking section, then the manufacturing process is simpler, but gaps form between the control terminal and the resin case under compressive loads, reducing mechanical strength and dimensional accuracy
Solution Approach 1:
The control terminal is segmented into functional sections: a through section for electrical connection, a linking section for structural support, and a blocking section with cut-out for mechanical locking. This segmentation allows each part to perform its specific function optimally, preventing gaps under compressive loads while maintaining manufacturability through standardized processes
Solution Approach 2:
The blocking section utilizes the thickness dimension of the control terminal by forming cut-outs that extend through the terminal's thickness. This dimensional approach creates an effective locking mechanism that prevents gaps without adding lateral complexity, as the blocking section engages with the resin case in the thickness direction rather than requiring complex lateral structures
2Reliability
If the through hole width is increased to accommodate a protruding section, then the control terminal can be locked to the lid, but gaps form between the control terminal and the through hole side section, reducing dimensional accuracy
Solution Approach 1:
Instead of adding a protruding section that extends beyond the control terminal body, the blocking section extracts material through cut-outs from the terminal's existing structure. This extraction approach creates the locking function within the terminal's original dimensional envelope, eliminating gaps with the through hole while maintaining locking reliability
Solution Approach 2:
The cut-outs in the blocking section are strategically positioned to engage with the resin case at critical locations. This local modification approach concentrates the locking function where needed without affecting the overall dimensional accuracy of the control terminal, as only specific regions are modified rather than the entire structure
3Reliability
If compressive loads are applied to the control terminal, then electrical connection is maintained, but the control terminal embeds into the resin case, causing substrate cracking and circuit pattern damage
Solution Approach 1:
The blocking section with cut-outs is designed to engage with the resin case before compressive loads can cause embedding. This preliminary mechanical interlocking creates resistance to embedding forces, preventing the control terminal from penetrating into the resin case and causing substrate damage, while still allowing necessary compressive loads for electrical connection
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
The design significantly increases mechanical strength and dimensional accuracy by eliminating gaps between the control terminal and the case, preventing substrate cracking and deformation, and allowing for higher compressive loads without embedding the terminal in the resin case.
Implementation Method 1
a blocking section that is formed by bending a portion surrounded by the cut-out section and remaining on the control terminal, comes into contact with the case from the outer side of the case, and blocks a movement of the control terminal
Data Source
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AI summary
A semiconductor device is constituted by a metal base (6), a wiring substrate (2) joined to the metal base (6), a semiconductor chip (1) and a control terminal (5) joined to circuit patterns (2a, 2b) of the wiring substrate (2), and a resin case (20) bonded to the metal base (6). The control terminal (5) is constituted by a through section (5a) passing through a lid (21) of the resin case (20), a linking section (5b) linked to the through section (5a), and a connection section (5c) linked to the linking section (5b). A blocking section (5d) and a cut-out section (5e) are provided in the portion of the control terminal (5) that passes through the lid (21). The blocking section (5d) is in contact with a step (21b) formed on the front surface of the lid (21). When the through section (5a) passes through the lid (21) of the resin case (20), the blocking section (5d) is accommodated inside the cut-out section (5e). The linking section (5b) is in contact with a protrusion (21c) provided on the rear surface of the lid (21).