Flat Cable Bonding via Anisotropic Conductive Film
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Solution Overview
Problem
The use of connectors for connecting circuit boards and flat cables increases costs while compromising connection stability.
Innovation Solution
An electronic apparatus that utilizes an anisotropic conductive film to bond one end of the flat cable to the circuit board's surface, with an engaging member to restrain the engaged portion of the flat cable, eliminating the need for connectors and maintaining stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a connector is used to connect the flat cable to the circuit board, then connection stability is improved, but costs increase
Solution Approach 1:
The patent extracts the connector component from the connection system and replaces it with a direct bonding structure using anisotropic conductive film. The flat cable is bonded directly to the circuit board through the ACF without requiring a separate connector, thereby eliminating the cost of the connector while maintaining connection stability through the adhesive and conductive properties of the ACF.
Solution Approach 2:
The anisotropic conductive film serves as an intermediary material between the flat cable and the circuit board. This ACF layer provides both mechanical bonding (adhesive function) and electrical connection (conductive function), replacing the need for a traditional connector while ensuring stable connection.
2Reliability
If a connector is used to connect the flat cable to the circuit board, then connection stability is improved, but device complexity increases
Solution Approach 1:
The connector component is extracted and removed from the system. The connection is achieved through a simpler structure where the flat cable is directly bonded to the circuit board using anisotropic conductive film, reducing the number of parts and simplifying the overall device structure while maintaining connection stability.
Solution Approach 2:
The bonding function and electrical connection function are merged into a single anisotropic conductive film layer. This eliminates the need for separate connector components that would otherwise be required to achieve both mechanical attachment and electrical connectivity, thereby reducing device complexity.
3Ease of manufacture
If the flat cable is bonded directly to the circuit board through anisotropic conductive film, then costs are reduced, but movement restraint may be insufficient
Solution Approach 1:
The patent introduces a reinforcing plate that extends in a direction different from the thickness direction of the flat cable. This reinforcing plate provides additional dimensional support and restraint, preventing movement of the flat cable in directions other than the thickness direction, thereby compensating for the reduced movement restraint in the thickness direction caused by eliminating the connector.
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 solution reduces costs while maintaining connection stability between the flat cable and circuit board, preventing unintended movement and ensuring reliable connectivity.
Implementation Method 1
one end of which is bonded to the surface of the circuit board through an anisotropic conductive film
Implementation Method 2
bonded to the surface of the circuit board through an anisotropic conductive film
Data Source
AI summary
An electronic apparatus 1 includes a flat cable 70, an end 70a of which is bonded to the front surface of a sub-board 30 through an anisotropic conductive film 79, engaged portions 74A and 74B formed in the flat cable 70, and an intermediate frame 40 that engages with the engaged portions 74A and 74B to restrain the movement of the engaged portions 74A and 74B in a direction away from the electrode on the sub-board 30. Consequently, it is possible to realize a reduction in costs while maintaining connection stability between a flat cable and a circuit board.