Folded Lead Wire Connection Terminal for Image Forming Apparatus
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Solution Overview
Problem
Existing electric connection structures in image forming apparatuses, such as those described in Japanese Unexamined Patent Application Publication No. 2017-44937, suffer from instability due to poor balance of the connection terminal, leading to an unstable contact state between the lead wire and the connection terminal.
Innovation Solution
An electric connection structure featuring a connection terminal with a compression coil spring part and a terminal holding part that includes a base and a guide part, where the lead wire has a folded-back part held between the compression coil spring part and the base, ensuring multi-point contact with the connection terminal for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the connection terminal is arranged on one lead wire that linearly extends, then the structure is simple, but the balance is poor and the contact state becomes unstable
Solution Approach 1:
The lead wire is folded back to form a U-shape configuration, transitioning from a linear one-dimensional arrangement to a two-dimensional folded structure. This dimensional change allows the connection terminal to be contacted by two lines of the folded-back part simultaneously, improving balance and contact stability while maintaining structural simplicity
2Ease of manufacture
If the connection terminal is arranged on one lead wire, then the assembly process is simple, but the connection terminal is liable to incline and contact state becomes unstable
Solution Approach 1:
The lead wire is configured in a folded-back U-shape arrangement, changing from linear to folded geometry. This allows the connection terminal to be contacted at multiple points (two lines of the folded-back part) simultaneously, preventing inclination and ensuring stable contact state during assembly and operation
3Reliability
If a folded-back part of the lead wire is used, then multi-point contact is achieved improving stability, but the structure becomes more complex
Solution Approach 1:
The lead wire is folded back to create a U-shape configuration, achieving multi-point contact (two lines contacting the connection terminal) through a simple folded arrangement rather than a complex multi-component structure. This maintains structural simplicity while improving contact stability
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 improves the balance and stability of the connection terminal, ensuring reliable electrical contact and preventing conduction failures, while also simplifying assembly by eliminating the need for fastening members like screws.
Implementation Method 1
connection terminal that includes a compression coil spring part
Data Source
AI summary
An electric connection structure includes: a connection terminal that includes a compression coil spring part; a terminal holding part that includes a base supporting one end surface side of the compression coil spring part and a guide part provided along an outer surface of the compression coil spring part; and a lead wire that includes a folded-back part in one end part. In the electric connection structure, the folded-back part is held between the one end surface of the compression coil spring part and a support part and two lines of the folded-back part are brought into contact with the connection terminal, and the connection terminal and the lead wire are thereby electrically connected.