Liquid Discharge Head Wire Shielding for Noise Reduction
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Solution Overview
Problem
Noise interference from drive signals complicates the determination of the state of a liquid discharge head in liquid discharge apparatuses, making it difficult to accurately assess the normalcy of liquid discharge states and overheating conditions.
Innovation Solution
A liquid discharge apparatus employs double-sided shielded wires for state signals, designation signals, and drive signals to prevent noise superimposition, allowing for clearer state signal transmission, including residual vibration and overheating notifications, and incorporates a controller with a characteristic-information storage unit to manage head module operations based on stored data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wire is used to supply drive signal and acquire state signal from liquid discharge head, then electrical connection is established, but noise from drive signal is superimposed on state signal
Solution Approach 1:
The wire is divided into multiple independent conductors (first conductor for state signal, second conductor for drive signal, third conductor for designation signal) with individual shielding. This segmentation isolates the state signal transmission path from noise-generating signals, allowing reliable state signal acquisition without noise superimposition.
Solution Approach 2:
Shielding layers (first shielding layer, second shielding layer) are introduced as intermediary elements between the state signal conductor and other signal conductors. These shielding layers act as mediators that block electromagnetic interference from drive signals and designation signals, preventing noise from reaching the state signal transmission path.
2Area of stationary object
If multiple wires are stacked with reduced interval in wire section, then space utilization is improved, but noise interference increases
Solution Approach 1:
Each wire is segmented into isolated conductors with individual shielding layers. The first conductor carrying the state signal is surrounded by first and second shielding layers, creating isolated transmission channels. This allows multiple wires to be stacked closely without noise interference, as each conductor's electromagnetic field is contained within its own shielding boundary.
Solution Approach 2:
The potential harm of close stacking (increased noise interference) is converted into a benefit by using the shielding layers to actively manage electromagnetic fields. The shielding structure transforms the close-proximity environment into an controlled space where noise is redirected away from the state signal conductor, enabling compact wiring while maintaining signal integrity.
Data Source
AI summary
A liquid discharge apparatus includes a liquid discharge head including a head module provided with a discharge section configured to be driven by a drive signal and discharge a liquid and a supply section configured to supply the drive signal to the discharge section in accordance with a designation signal for designating an operation in the discharge section, and a state signal output section configured to output a state signal, and a wire section including a first wire to which the state signal is supplied, a second wire configured to supply the designation signal, and a third wire configured to supply the drive signal. The first wire includes a first shielding layer containing a conductive material, a second shielding layer containing a conductive material, and a first conductor provided between the first shielding layer and the second shielding layer, the first conductor being configured to transmit the state signal.