Wiring Board Assembly with Extended Electrodes for Curling Resistance
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Solution Overview
Problem
Integrated wiring board assemblies with flexible boards tend to curl up, leading to damage and breakage of contact points, which compromises the electrical connection between the flexible and printed boards.
Innovation Solution
The integration of a joint member that brazes or solders the contact points of both boards, with extended connection electrodes that surround the contact points and have bent portions to enhance bonding strength, ensuring the connection remains intact even when the flexible board curls up.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the flexible board is used to connect wiring boards, then flexibility and ease of connection are improved, but the board end portions curl up causing contact points to be damaged and broken
Solution Approach 1:
The patent applies preliminary action by extending the connection electrodes beyond the contact points and forming bent portions before assembly. These bent portions are pre-formed to surround and protect the contact points, preventing damage before it can occur during assembly or use. The extended electrodes are positioned in advance to ensure proper alignment and connection even when the flexible board curls.
2Reliability
If contact points are arranged in a row on the flexible board, then electrical connection is achieved, but the left and right side portions of the flexible board easily curl up damaging the end contact points
Solution Approach 1:
The patent implements beforehand cushioning by creating bent portions of the connection electrodes that surround and cushion the contact points at both ends of the row. These bent portions act as protective structures that absorb and distribute mechanical stress, preventing the contact points from being damaged when the flexible board curls during assembly or use.
3Reliability
If soldering is used to connect contact points, then electrical connection is established, but bonding strength is insufficient when the flexible board curls up
Solution Approach 1:
The patent applies preliminary action by extending the connection electrodes beyond the contact points and pre-forming bent portions that surround the contact points. This preliminary extension and shaping of the electrodes creates a stronger mechanical structure that maintains bonding strength even when the flexible board curls, preventing connection failure.
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 configuration significantly increases the bonding strength between the boards, maintaining electrical connectivity despite curling, and reduces heat production at high-current contact points by using larger contact points.
Implementation Method 1
The joint member is used for the first contact points of the first wiring board and the second contact points of the second wiring board to be brazed or soldered
Implementation Method 2
the first contact points and the second contact points face one another and used for the first connection electrode of the first wiring board and the second connection electrode of the second wiring board to be brazed or soldered
Data Source
AI summary
A connection FPC 75 and a sheet heater 30 are joined together with a solder joint member interposed therebetween. The connection FPC 75 includes a ground contact point 90b and a connection electrode 90d extending along a row of contact points and to which the ground contact point 90b is connected. The connection electrode 90d extends beyond both ends of the row. The sheet heater 30 includes a ground land 46b and a connection land 46d extending along a row of lands and to which the ground land 46b is connected. The connection land 46d extends beyond both ends of the row.