MID Reservoir Segmentation for Paste Containment
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Solution Overview
Problem
Existing connection structures between molded interconnect devices (MIDs) and wiring boards using electroconductive paste face reliability issues due to the paste's tendency to spread and short-circuit, especially when in contact with non-electroconductive resin, leading to insufficient connections and reduced reliability.
Innovation Solution
A connection structure featuring a molded interconnect device with non-electroconductive resin as a base material and electroconductive paste members that are housed in reservoir sections, preventing contact with the resin and minimizing spread, ensuring high bonding strength to metal electrodes while maintaining low bonding strength to resin, thus enhancing connection reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If electroconductive paste is used to connect MID to wiring board, then low temperature bonding is achieved, but the paste spreads and causes short-circuits reducing reliability
Solution Approach 1:
The patent divides the bonding interface into separate regions by introducing reservoir sections that contain the electroconductive paste. Each paste member is segmented into its own enclosed space, preventing spread to adjacent areas. This segmentation allows low-temperature bonding while maintaining connection reliability by isolating the paste within defined boundaries.
Solution Approach 2:
The reservoir section acts as an intermediary structure between the electroconductive paste and the non-electroconductive resin. This intermediate enclosure allows the paste to perform its bonding function at low temperatures while preventing direct contact with the resin that would cause short-circuits. The reservoir serves as a mediating element that resolves the contradiction between low-temperature bonding and connection reliability.
2Strength
If electroconductive paste contacts non-electroconductive resin, then bonding is achieved, but short-circuits occur reducing connection reliability
Solution Approach 1:
The patent segments the bonding interface by creating separate reservoir sections for each electroconductive paste member. This segmentation ensures that the paste maintains strong bonding to the metal electrodes within the enclosed space while preventing contact with the non-electroconductive resin. The segmentation strategy simultaneously achieves high bonding strength and high connection reliability.
Solution Approach 2:
The patent applies local quality by creating regions with different functional properties: the reservoir sections provide an enclosed environment where paste can bond strongly to metal electrodes, while the surrounding non-electroconductive resin remains isolated from the paste. This local differentiation allows strong bonding where needed while preventing short-circuits where contact would be harmful.
3Temperature
If electroconductive paste is applied freely, then low temperature bonding is possible, but paste spread causes insufficient connections
Solution Approach 1:
The patent introduces reservoir sections that segment the paste application area into discrete, enclosed spaces. This segmentation enables free application of paste at low temperatures while preventing unwanted spread. The enclosed reservoirs maintain manufacturing precision by confining the paste to specific regions, ensuring accurate electrical connections without requiring high-precision application processes.
Solution Approach 2:
The reservoir section serves as an intermediary structure that mediates between the electroconductive paste and the surrounding environment. It allows the paste to be applied freely at low temperatures while preventing spread that would compromise connection precision. The reservoir acts as a containment mediator that maintains manufacturing precision without restricting the low-temperature bonding process.
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 solution effectively prevents the electroconductive paste from coming into contact with the non-electroconductive resin, reducing the risk of short-circuits and ensuring high reliability in the electrical connection between the wiring board and the MID, even at low temperatures.
Implementation Method 1
the plurality of electroconductive members are housed in respective reservoir sections formed by the second member and are not in contact with the non-electroconductive resin
Implementation Method 2
each of the electroconductive members electrically connecting each of the plurality of first electrodes to each of the plurality of second electrodes
Data Source
AI summary
A connection structure includes: a wiring board including a plurality of first electrodes that are arranged on a principal surface; a molded interconnect device (MID) made of a non-electroconductive resin as a base material, the MID including a side surface and a bottom surface, the bottom surface being parallel to the principal surface of the wiring board and including a plurality of arranged second electrodes, and the side surface being perpendicular to the principal surface of the wiring board; and a plurality of electroconductive members each made of an electroconductive paste, each of the electroconductive members electrically connecting each of the plurality of first electrodes to each of the plurality of second electrodes, in which the plurality of electroconductive members are housed in respective reservoir sections formed by the second member and are not in contact with the non-electroconductive resin.