Liquid Discharge Head Drive Circuit Wiring Length Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing liquid discharge devices using piezoelectric elements for inkjet printing lack optimization in drive signal waveforms and circuit disposition, which affects discharge accuracy and efficiency.
Innovation Solution
A liquid discharge device with a head drive circuit configuration that includes multiple drive circuits and wiring arrangements to output specific drive signals to piezoelectric elements, optimizing signal propagation and waveform design for improved discharge control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple drive circuits are arranged side by side on the substrate, then the discharge accuracy can be improved by optimizing signal propagation, but the wiring length differences between circuits create unequal signal transmission paths
Solution Approach 1:
The patent applies local quality by making each drive circuit have substantially equal wiring length from the connector to the piezoelectric element. Specifically, the first wiring has length L1, the second wiring has length L1+ΔL, the third wiring has length L1-ΔL, and the fourth wiring has length L1, where ΔL is a predetermined value. This local optimization of wiring length ensures uniform signal propagation characteristics for each drive circuit, improving discharge accuracy while maintaining manageable device complexity through systematic wiring design.
2Measurement precision
If drive circuits output sufficient current for piezoelectric elements, then high accuracy driving is achieved, but the current supply requirement increases the complexity of the drive circuit design
Solution Approach 1:
The patent segments the drive circuits into multiple independent circuits (first drive circuit, second drive circuit, third drive circuit, and fourth drive circuit), each responsible for driving specific piezoelectric elements. Each drive circuit outputs drive signals with optimized current characteristics tailored to its specific piezoelectric element, allowing precise control while distributing the current supply complexity across multiple independent circuit modules rather than requiring a single complex high-current supply system.
3Manufacturing precision
If piezoelectric elements are driven with optimized drive signals, then discharge amount control is improved, but the signal waveform optimization increases circuit design complexity
Solution Approach 1:
The patent applies parameter changes by optimizing the drive signal waveforms with specific characteristics for each piezoelectric element. The first drive circuit outputs a first drive signal with specific waveform parameters, the second drive circuit outputs a second drive signal with different waveform parameters, and so on. This systematic parameter optimization of signal waveforms enables precise control of discharge amounts while managing design complexity through standardized waveform optimization procedures.
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
Enhances discharge accuracy and efficiency by tailored signal output to piezoelectric elements, allowing for precise control of ink amount and distribution.
Implementation Method 1
the piezoelectric element is a capacitive load like a capacitor when electrically viewed
Data Source
AI summary
A liquid discharge device including a first drive circuit, a second drive circuit, a third drive circuit, a fourth drive circuit, a connector coupled to a discharge head, and a substrate that includes a first wiring which couples the connector and the first drive circuit outputting a first drive signal, a second wiring which couples the connector and the second drive circuit outputting a second drive signal, a third wiring which couples the connector and the third drive circuit outputting a third drive signal, and a fourth wiring which couples the connector and the fourth drive circuit outputting a fourth drive signal, in which the first wiring is shorter than the second wiring, the third wiring, and the fourth wiring, and the fourth wiring is longer than the first wiring, the second wiring, and the third wiring.