Metal Inlay in Substrate Through Hole for Press-Fit Terminal
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Solution Overview
Problem
Conventional electronic devices with press-fit terminals experience a reduction in holding force due to deformation of dummy holes under elastic deformation reaction forces, leading to strain restriction issues in substrates.
Innovation Solution
Incorporating a metal inlay press-fitted into a second through hole located between the first through hole and the electronic component or wiring, which aligns with the elastic deformation direction of the press-fit terminal, thereby restricting strain and maintaining the holding force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a dummy hole is provided between through holes to restrict strain in the substrate, then the strain is restricted, but the dummy hole is deformed by reaction force of elastic deformation and the holding force is reduced
Solution Approach 1:
A metal inlay is introduced as an intermediary element between the press-fit terminal and the substrate. The inlay is press-fitted into a second through hole and positioned between the first through hole (containing the press-fit terminal) and the electronic component/wiring. This intermediary structure restricts strain in the substrate without being deformed by the reaction force, thereby maintaining the holding force of the substrate.
2Stability of the object's composition
If the inlay is press-fitted in the second through hole, then the strain is restricted, but the device structure becomes more complex
Solution Approach 1:
The metal inlay serves multiple functions: it restricts strain in the substrate, provides a stable mounting position for electronic components, enhances heat dissipation, and maintains the holding force of the substrate. By consolidating these functions into a single element, the overall device complexity is minimized while achieving multiple technical objectives.
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 metal inlay effectively restricts strain in the substrate, preventing deformation and maintaining the holding force of the press-fit terminal, while also enhancing heat dissipation and connection reliability.
Implementation Method 1
the press-fit terminal applies a reaction force of elastic deformation to a wall surface of the through hole
Data Source
AI summary
An electronic device includes a press-fit terminal, an electronic component and a substrate. The substrate includes a first through hole, a second through hole and an inlay. The press-fit terminal is press-fitted in the first through hole. The second through hole is located between the first through hole and a part of the substrate at which the electronic component is mounted. The inlay is made of a metal material and press-fitted in the second through hole. The inlay restricts a strain in the substrate and restricts decrease of a holding force of the substrate holding the press-fit terminal.