Shielded Cable Positioning for Signal Noise Reduction
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Solution Overview
Problem
Existing liquid discharging apparatuses face challenges in minimizing size due to increased area occupancy and complexity from mutual signal interference and misalignment issues in flexible flat cables, particularly with the need for ground wires and shield layers.
Innovation Solution
The apparatus incorporates a shielded cable with a conductive material for higher-frequency signals and non-shielded cables for lower-frequency signals, with the non-shielded cables positioned between the shielded cables and the housing, reducing noise interference and maintaining a compact structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ground wires are provided to reduce mutual interference in flexible flat cables, then signal interference is reduced, but the number of wires increases and the area occupied by the cable increases
Solution Approach 1:
The patent combines the ground wire function with the housing structure by making the housing itself conductive and serving as the ground reference. This eliminates the need for separate ground wires in the flexible flat cable, reducing the cable's wire count and area while maintaining signal interference reduction through the housing's ground potential.
2Adaptability or versatility
If the number of signals in flexible flat cable increases to improve control functionality, then control capability is enhanced, but wiring density increases and misalignment risk increases
Solution Approach 1:
The patent introduces a conductive housing as an intermediary reference potential structure that simplifies the wiring architecture. By using the housing as a common ground reference, the system can accommodate multiple control signals without proportionally increasing wiring complexity, as the housing serves as a shared reference for all signal wires.
3Reliability
If shield layer is added to flexible flat cable to reduce signal interference, then mutual interference is reduced, but cable thickness and width increase
Solution Approach 1:
The patent extracts the shielding function from the flexible flat cable itself and relocates it to the housing structure. The conductive housing serves as the shield, providing interference protection for signals while allowing the flexible flat cable to remain thin and compact without its own integrated shield layer.
4Manufacturing precision
If extra components are provided to prevent misalignment of ground wires, then misalignment risk is reduced, but device complexity and size increase
Solution Approach 1:
The conductive housing serves multiple functions simultaneously: it provides the ground reference potential, acts as a shield against interference, and serves as a mechanical reference structure for wire alignment. This multi-functionality eliminates the need for separate alignment components while maintaining manufacturing precision.
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 effectively reduces signal contamination and prevents size increase, maintaining the apparatus's compactness while ensuring accurate signal propagation and status monitoring.
Implementation Method 1
the second cable includes a shield layer containing a conductive material
Data Source
AI summary
A liquid discharging apparatus includes: a drive unit that includes a discharging head that discharges liquid; a first board that includes a control circuit that controls the discharging head; a first cable for electrical coupling between the control circuit and the drive unit; a second cable for electrical coupling between the control circuit and the drive unit; and housing inside which the drive unit, the first board, the first cable, and the second cable are housed. The second cable includes a shield layer containing a conductive material. The position of the first cable is between the housing and the second cable.