Inkjet Head Driving Device High Impedance Control
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Solution Overview
Problem
Inkjet heads with shared actuators experience noise current and wasteful power consumption due to floating capacitors when adjacent ink chambers are driven with the same potential, leading to inefficient ink ejection and potential errors in droplet ejection.
Innovation Solution
A driving device and method that sets electrodes of ink chambers to a high impedance state when an identical potential is applied to at least three adjacent ink chambers, preventing the charging or discharging of floating capacitors and reducing noise current by maintaining a high impedance state during specific operational states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adjacent ink chambers are driven with the same potential to prevent partition deformation, then ink ejection reliability is improved, but noise current and power consumption increase due to floating capacitor charging/discharging
Solution Approach 1:
The patent changes the electrical parameter (impedance state) of the electrodes during operation. When adjacent ink chambers are driven with the same potential, the control circuit sets the electrodes to a high impedance state (floating state), preventing the charging/discharging of floating capacitors and eliminating noise current while maintaining ink ejection reliability.
2Loss of energy
If electrodes are set to high impedance state to reduce noise current, then power consumption is reduced, but control complexity increases
Solution Approach 1:
The control circuit monitors the driving state of adjacent ink chambers and automatically adjusts the impedance state of the electrodes accordingly. When adjacent chambers are driven with the same potential, the feedback mechanism activates the high impedance state, reducing power consumption without requiring complex manual control.
3Stability of the object's composition
If floating capacitors are allowed to charge/discharge, then ink chamber potential stability is maintained, but noise current is generated causing wasteful power consumption
Solution Approach 1:
The patent converts the harmful effect of floating capacitor charging/discharging (noise current) into a beneficial state by intentionally setting electrodes to high impedance. This prevents the harmful noise current while maintaining potential stability through the natural charge retention of capacitors in the high impedance state.
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 reduces noise current and wasteful power consumption, ensuring precise ink ejection and minimizing errors by controlling the impedance of electrodes in the inkjet head, thereby improving the efficiency and reliability of the inkjet head operation.
Implementation Method 1
a plurality of ink chambers which are separated from each other by partitions made of a piezoelectric material are arranged in parallel
Data Source
AI summary
There is provided a controller which sets electrodes which are respectively disposed on wall surfaces of a plurality of ink chambers which are arranged in parallel so as to be separated from each other by partitions made of a piezoelectric material, to a high impedance state. In addition, at a timing when an identical potential is applied to the electrodes of at least three ink chambers which are arranged in parallel so as to be separated from each other by mutually adjacent partitions, the controller sets electrodes of ink chambers other than ink chambers located on both sides to a high impedance state.