Liquid Discharging Apparatus Pulse Sequence for Vibration Control
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Solution Overview
Problem
High viscosity liquids in liquid discharging apparatuses, such as ink jet printers, face challenges with discharge consistency due to high resistance in flow channels and residual vibrations from previous discharge pulses, leading to deviations in droplet amount and flying speed.
Innovation Solution
A liquid discharging apparatus that includes a pressure chamber, a pressure-changing element, and a pulse generating section, which generates a first discharge pulse, a non-discharge pulse to create pressure vibration, and a second discharge pulse, utilizing the pressure vibration from the non-discharge pulse to assist in discharging liquid droplets, thereby suppressing the effects of residual vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a previous discharge pulse is applied to discharge liquid droplets, then liquid discharge is achieved, but residual vibration affects subsequent discharge pulses causing deviation in droplet amount and flying speed
Solution Approach 1:
A non-discharge pulse is applied before the subsequent discharge pulse to preemptively control the pressure vibration state in the liquid. This preliminary action resets the vibration phase and creates optimal conditions for the following discharge pulse, ensuring consistent droplet discharge without interference from previous pulse residuals.
Solution Approach 2:
The discharge process uses periodic pulsing with alternating non-discharge pulses and discharge pulses. This periodic pattern allows the liquid to return to a stable vibration state between discharge events, enabling consistent and controlled droplet ejection while managing residual vibrations systematically.
2Productivity
If high viscosity liquid is discharged, then liquid discharge is achieved, but high resistance in flow channel requires more considerable discharge pulse
Solution Approach 1:
The non-discharge pulse prepares the liquid by establishing optimal pressure vibration conditions before the actual discharge pulse. This preliminary preparation reduces the energy required by the subsequent discharge pulse to overcome flow channel resistance, making high viscosity liquid discharge more efficient.
Solution Approach 2:
The pulse waveform parameters (voltage, duration, timing) are optimized based on liquid viscosity characteristics. By adjusting these parameters and using the non-discharge pulse to pre-condition the liquid, the system achieves effective discharge of high viscosity liquids while minimizing energy consumption compared to using only high-energy discharge pulses.
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 approach effectively stabilizes the discharge of high viscosity liquids by using the pressure vibration from the non-discharge pulse to enhance the discharge of liquid droplets, reducing deviations in droplet amount and flying speed, and improving discharge consistency.
Implementation Method 1
an element that performs an operation for providing change of pressure to liquid within the pressure chamber
Implementation Method 2
a non-discharge pulse, generated later than the first discharge pulse, that produces pressure vibration of strength, by which the liquid droplets are not discharged from the nozzles, in the liquid within the pressure chamber
Data Source
AI summary
A liquid discharging apparatus is provided, which including: a pressure chamber communicating with a liquid supply portion and each nozzle; an element that performs an operation for providing change of pressure to liquid within the pressure chamber; and a pulse generating section that generates a pulse of which a voltage is changed to operate the element. The pulse generating section generates a first discharge pulse that causes the element to perform an operation for discharging liquid droplets from the nozzles, a non-discharge pulse, generated later than the first discharge pulse, that produces pressure vibration of strength, by which the liquid droplets are not discharged from the nozzles, in the liquid within the pressure chamber, which has a phase different from pressure vibration produced in the liquid within the pressure chamber by applying the first discharge pulse to the element, and a second discharge pulse, generated later than the non-discharge pulse, that causes the element to perform the operation for discharging the liquid droplets from the nozzles, while using the pressure vibration produced in the liquid within the pressure chamber by applying the non-discharge pulse to the element.