Liquid Ejection Drive Pulses for Residual Vibration Control
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Solution Overview
Problem
Existing liquid ejecting apparatuses face difficulties in accurately correcting the amount of droplets ejected, despite adjustments to the electrical potential difference in drive signals.
Innovation Solution
The method involves generating drive signals with ejection pulses that include an ejection waveform element and a residual vibration suppression element, adjusting the residual vibration suppression element to correct the weight of droplets ejected over multiple drive periods, using a drive signal generating circuit to control the pressure changes in the pressure chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the difference between the highest and lowest electrical potentials in the drive signal is adjusted to correct droplet ejection amount, then the droplet ejection amount can be modified, but the correction accuracy is insufficient and cannot achieve desired precision
Solution Approach 1:
The drive signal is divided into multiple independent pulse signals, each capable of controlling a specific ejection section. This segmentation allows precise control of droplet ejection amount for each section independently, enabling accurate correction without affecting other sections.
Solution Approach 2:
The drive signal is made dynamically adjustable with multiple ejection pulses having different electrical potential differences. The control circuit can selectively adjust the electrical potential difference of specific pulses based on detected droplet ejection amounts, enabling real-time precise correction.
2Manufacturing precision
If multiple ejection pulses are used to control droplet ejection, then droplet weight can be precisely controlled, but the device complexity increases
Solution Approach 1:
A single control circuit performs multiple functions: it generates multiple ejection pulses, adjusts electrical potential differences, detects droplet ejection amounts, and corrects deviations. This multi-functionality reduces overall device complexity despite using multiple pulses for precise droplet weight control.
Solution Approach 2:
The control circuit detects the actual droplet ejection amount and uses this feedback to adjust the electrical potential difference of subsequent pulses. This closed-loop feedback mechanism enables precise droplet weight control while simplifying the control logic through automated adjustment.
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 allows for precise control of droplet weight by reducing residual pressure changes in the pressure chamber, thereby improving the accuracy of droplet ejection in liquid ejecting apparatuses.
Implementation Method 1
a drive element that is driven to change pressure applied to liquid in a pressure chamber according to the supplied drive signal
Implementation Method 2
a residual vibration suppression element that reduces the change in the pressure applied to the liquid in the pressure chamber, the change in the pressure remaining after the ejection of the droplet from the nozzle according to a natural vibration period of the ejection section
Data Source
AI summary
A liquid ejecting apparatus includes an ejection section that is configured to eject a droplet from a nozzle communicating with a pressure chamber by driving a drive element according to a supplied drive signal The drive signal includes a at least one ejection pulse including an ejection waveform element that changes an electrical potential to be ejected a droplet from the nozzle, and a residual vibration suppression element that changes an electrical potential to reduce the change in the pressure of the liquid in the pressure chamber, the change in the pressure remaining after the ejection of the droplet according to a natural vibration period of the ejection section. A weight of droplets to be continuously ejected from the nozzle when the drive signal is supplied to the drive element over a period corresponding to two or more drive periods is corrected by adjusting the residual vibration suppression element.