Flexible Flat Cable Ground Wiring Wear Prevention
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Solution Overview
Problem
In image reading apparatuses, the bent ground wiring member can enter gaps between accommodating portions and signal wiring members, causing wear on the signal wiring due to pressing forces, which existing technologies fail to adequately prevent.
Innovation Solution
The design includes a ground wiring member with a wider portion that is longer than the gap between accommodating portions and signal wiring members, allowing it to be accommodated without pressing on the signal wiring, and features like widened portions and accommodating portions that restrict movement and overlap with curved signal wiring to prevent wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the ground wiring member is made with a smaller width to fit in the accommodating portion, then the accommodating space is optimized, but the bent ground wiring member can enter the gap between the accommodating portion and signal wiring member causing wear
Solution Approach 1:
The ground wiring member is designed with non-uniform width: a first width in the accommodating portion and a second width (greater than the first width) at the bent portion. This local variation in dimensions prevents the bent ground wiring from entering the gap and contacting the signal wiring member, while still fitting within the accommodating portion constraints.
Solution Approach 2:
The solution addresses the two-dimensional gap problem by introducing a width dimension variation along the length of the ground wiring member. The bent portion extends further in the width direction than the straight portion, creating a dimensional barrier that prevents entry into the gap between accommodating portion and signal wiring.
2Reliability
If the ground wiring member is made wider to prevent entering the gap, then the signal wiring wear is prevented, but the accommodating portion size increases
Solution Approach 1:
The ground wiring member is designed with non-uniform width: a first width in the accommodating portion and a second width (greater than the first width) at the bent portion. This local variation in dimensions prevents the bent ground wiring from entering the gap and contacting the signal wiring member, while still fitting within the accommodating portion constraints.
3Reliability
If the ground wiring member width is increased to block the gap, then wear prevention is achieved, but the overall cable assembly size increases
Solution Approach 1:
The ground wiring member is designed with non-uniform width: a first width in the accommodating portion and a second width (greater than the first width) at the bent portion. This local variation in dimensions prevents the bent ground wiring from entering the gap and contacting the signal wiring member, while still fitting within the accommodating portion constraints.
Data Source
AI summary
An image reading apparatus includes a lower unit, an upper unit, a flexible flat cable (FFC), a GND harness, an accommodating portion, and a widened portion. The lower unit includes a main board. The upper unit includes a sub-board and is pivotably connected to the lower unit. The FFC and the GND harness have flexibility and couple the main board and the sub-board to each other. The accommodating portion accommodates the FFC and the GND harness. A length of the GND harness in a width direction is larger than a length corresponding to a gap between the accommodating portion and the FFC.