Flexible Printed Wiring Board Crimp Structure for Stable Contact
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Solution Overview
Problem
Existing techniques for attaching crimp terminals to flexible printed wiring boards result in insufficient electrical connection and reduced strength due to limited contact area and weak conductor material, such as copper foil.
Innovation Solution
The crimp terminal is designed with crimping pieces that penetrate and bite into exposed regions of the circuit without penetrating the cover film, increasing contact area and ensuring strength by incorporating the base film in the crimped portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the crimping piece penetrates the base film and cover film to bite into the circuit, then the crimp terminal can be attached to the flexible printed wiring board, but the contact area between the crimping piece and the circuit is small and electrical connection is insufficient
Solution Approach 1:
The cover film is removed in advance from the region where crimping pieces will be arranged, creating a prepared area where the circuit is exposed. This preliminary action allows the crimping pieces to directly contact and bite into the circuit with a larger contact area, improving electrical connection without needing to penetrate the cover film during the crimping process.
2Reliability
If the crimping piece is bent to bite into the circuit, then the crimp terminal can be attached, but the strength is low because the conductor is made of copper foil or the like
Solution Approach 1:
The crimp terminal structure combines the flexible printed wiring board (with its base film and circuit) and the crimp terminal body into a composite assembly. The base film of the flexible printed wiring board is incorporated into the crimped portion, creating a composite structure that leverages the strength of the base film to compensate for the low strength of the copper foil conductor alone, while maintaining overall flexibility.
3Reliability
If the crimping piece penetrates the base film and cover film, then the crimp terminal can be attached, but the base film and cover film are damaged
Solution Approach 1:
The cover film is removed in advance from the crimping region before the crimping process. This preliminary removal prevents the cover film from being damaged during crimping, while the base film is strategically incorporated into the crimped portion to provide structural support and maintain integrity where needed.
4Reliability
If the crimp terminal is designed to penetrate the cover film, then attachment is achieved, but the cover film protection function is lost in the crimped region
Solution Approach 1:
The cover film is selectively removed in advance only from the specific region where crimping pieces will be arranged. This preliminary action maintains the cover film's protective function in all other regions of the flexible printed wiring board, while allowing direct contact between the crimping pieces and the circuit in the exposed region for reliable attachment.
Data Source
AI summary
A flexible printed wiring board with crimp terminal includes: a flexible printed wiring board having a base film, a circuit including a metal foil provided on a surface of the base film, and a cover film attached to the base film so as to sandwich the circuit; and a crimp terminal with a plurality of crimping pieces that penetrates the flexible printed wiring board by being crimped and is bent to bite into a part of the circuit. A part of the circuit is exposed without the cover film being provided in a partial region of the flexible printed wiring board, and at least some of the crimping pieces are arranged in the partial region, and thus bite into a part of the circuit without penetrating the cover film.