Semiconductor Stem Structure for Brazing Position Accuracy
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Solution Overview
Problem
The existing methods for manufacturing stems with semiconductor devices face challenges in maintaining the accuracy of the device mounting surface position due to positional shifts caused by stress during the brazing process, which often require shape correction to rectify, but this correction can lead to uneven surfaces.
Innovation Solution
A stem design featuring a base member with a columnar portion that rises from its surface, allowing the block member to be fixed in a state where it is pressed against these columns, thereby maintaining the block member's position during brazing and preventing shifts, ensuring accurate positioning without the need for shape correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the block member is fixed to the base member by brazing, then the block member can be securely attached, but the block member shifts from the reference position due to stress during solidification of the brazing material
Solution Approach 1:
The columnar portion is formed on the base member before the brazing process. This preliminary structural feature serves as a positioning guide that constrains the block member's position during brazing, preventing stress-induced shifts while maintaining secure attachment through the brazing process.
Solution Approach 2:
The columnar portion acts as an intermediary element between the base member and the block member. It provides a controlled interface that manages the stress distribution during brazing, allowing the block member to be securely attached without shifting from its reference position.
2Manufacturing precision
If shape correction is performed by pressing a punch against the device mounting surface, then the accuracy of position of the device mounting surface is improved, but the surface becomes uneven with differences in level
Solution Approach 1:
The columnar portion is formed in advance on the base member to provide precise positioning during brazing. This preliminary action ensures the block member is correctly positioned before any final adjustments, eliminating the need for subsequent shape correction that would compromise surface flatness.
Solution Approach 2:
Instead of using forceful shape correction that damages the surface, the invention uses the columnar portion to convert the brazing process itself into a positioning mechanism. The columnar structure guides the block member into the correct position naturally during brazing, turning the brazing operation into a beneficial positioning tool rather than requiring separate correction steps.
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
This design effectively prevents positional shifts of the device mounting surface, ensuring accurate placement within ±30 μm of the reference position without requiring shape correction, thereby enhancing the stability and precision of the device mounting surface.
Implementation Method 1
the block member is fixed to the one surface of the base member by brazing
Implementation Method 2
stress applied to the block member in association with solidification of the brazing material corresponding to the fixing material after the brazing material has been melted
Data Source
AI summary
A stem includes a base member and a block member. The base member includes a main body portion and a columnar portion that rises from one surface of the main body portion. The block member incudes a device mounting surface, on which a semiconductor device is able to be mounted, and is fixed to the one surface of the main body portion in a state in which the block member is pressed against the columnar portion.