Voltage Control Device for Liquid Injection Head
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Solution Overview
Problem
Conventional voltage control devices for liquid injection heads fail to accurately control voltage due to fluctuations in piezoelectric elements and varying physical properties of inks, leading to dispersion in ink droplet jetting and decreased image quality, as they do not account for waveform amplification fluctuations and require complex structures for precise voltage reading.
Innovation Solution
A voltage control device with a waveform generator, voltage determiner, amplifier, amplifier, reader, and adjuster that uses a simple structure to measure voltage immediately before application, incorporating a switching mechanism to select between primary and correction waveforms, allowing for accurate voltage control and correction value calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If voltage is read after waveform amplification to control piezoelectric elements, then voltage control structure becomes simpler, but voltage reading accuracy deteriorates due to amplification fluctuations not being considered
Solution Approach 1:
The patent applies preliminary action by reading the voltage of the drive waveform before it is amplified by the waveform amplifying section. This allows the voltage control device to obtain accurate voltage information at the original scale, avoiding the amplification fluctuations that would occur if reading after amplification. The voltage reader is positioned to read voltage from the drive waveform output of the waveform generator, prior to the voltage being subjected to amplification by the voltage amplifying section.
2Manufacturing precision
If calibration is conducted to correct voltage differences between nozzles, then voltage control accuracy improves, but device complexity increases due to additional correction mechanisms
Solution Approach 1:
The patent applies feedback by implementing a calibration process where the voltage control device reads the actual voltage of drive waveforms for multiple nozzles, compares them to determine voltage differences, and calculates correction values. These correction values are then used to adjust the drive waveforms before amplification, ensuring each nozzle receives the correct voltage. The feedback loop includes: reading voltage for each nozzle, comparing voltages to determine differences, calculating correction values, and applying corrections to the drive waveforms.
3Stability of the object's composition
If separate voltage control is implemented for each nozzle, then ink droplet jetting uniformity improves, but device complexity increases due to multiple voltage reading and control paths
Solution Approach 1:
The patent applies segmentation by providing separate voltage control paths for each nozzle. The voltage control device includes multiple voltage readers that can read voltages for different nozzles, and the control unit processes voltage information separately for each nozzle to determine individual correction values. This allows independent voltage optimization for each nozzle while maintaining a unified control device structure.
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
Enables accurate voltage control with reduced dispersion, improving the reliability of voltage adjustments and maintaining high image quality by accounting for waveform amplification fluctuations and simplifying the voltage reading process.
Implementation Method 1
piezoelectric elements are used as drive elements for jetting ink droplets, and when a plurality of piezoelectric elements provided corresponding to plural nozzles are driven selectively, ink droplets are jetted from the nozzles based on dynamic pressure of each piezoelectric element
Data Source
AI summary
A voltage control device for a liquid injection head corrects a voltage supplied to the liquid injection head.