Liquid Discharge Head Cable Wiring for Crosstalk Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing liquid discharge apparatuses face issues with electromagnetic noise interference between drive waveforms, leading to distorted waveforms and reduced discharge performance due to crosstalk in the wiring of the cable connecting the liquid discharge head and the drive waveform generation unit.
Innovation Solution
The cable arrangement includes multiple wires for each signal type, with at least (n−1) third wires placed between the first and second wires, effectively reducing electromagnetic noise interference by positioning the voltage signal wires between the drive signal wires, thereby minimizing crosstalk and maintaining waveform integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple wires are used for each signal type in the cable, then electromagnetic noise interference is reduced, but the cable complexity and space requirements increase
Solution Approach 1:
The patent uses the voltage signal wires (third wires) as intermediary elements positioned between the first drive signal wires and second drive signal wires. These intermediary wires act as electromagnetic shields, utilizing their voltage signals to counteract or reduce the electromagnetic noise between the drive signal wires, thereby improving signal transmission quality without requiring additional dedicated shield wires.
2Reliability
If voltage signal wires are positioned between drive signal wires, then crosstalk is minimized, but the cable arrangement becomes more complex
Solution Approach 1:
The patent merges the functions of signal transmission and electromagnetic shielding by using the same voltage signal wires (third wires) for both purposes. Instead of having separate dedicated shield wires, the voltage signal wires perform dual functions: transmitting control signals to the common electrode and simultaneously acting as electromagnetic barriers between drive signal wires, thus reducing crosstalk while avoiding additional wire complexity.
3Reliability
If more wires are added to reduce electromagnetic interference, then discharge performance improves, but the number of wires and space required increases
Solution Approach 1:
The voltage signal wires (third wires) are designed to serve multiple functions simultaneously: they transmit control signals to the common electrode for piezoelectric element operation and also function as electromagnetic interference shields between the drive signal wires. This multi-functional design improves discharge performance by reducing electromagnetic noise without increasing the total wire count, as the same wires perform both signaling and shielding roles.
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 enhances the discharge properties of the liquid discharge head by reducing electromagnetic noise influence, improving the reliability and accuracy of liquid droplet discharge, and potentially reducing the number of wires needed, thus saving space and cost.
Implementation Method 1
The liquid discharge head includes a common electrode and multiple individual electrodes corresponding to multiple piezoelectric elements, respectively
Data Source
AI summary
A head unit includes a liquid discharge head, circuitry, and a cable. The liquid discharge head includes multiple piezoelectric elements including multiple individual electrodes and a common electrode. The circuitry generates a first drive signal applied to the multiple individual electrodes, a second drive signal applied to the multiple individual electrodes and having a different waveform from the first drive signal, and a voltage signal applied to the common electrode. The cable connects the liquid discharge head and the circuitry. The cable includes n first wires through which the first drive signal is transmitted, n second wires through which the second drive signal is transmitted, and n third wires through which the voltage signal is transmitted. Here, n is an integer equal to or greater than 2. Each of at least (n−1) third wires is arranged between one of the n first wires and one of the n second wires.