Axially Symmetrical Electrodes Stabilize Ink Jet Head Discharge
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Solution Overview
Problem
Piezoelectric element-type ink jet heads face challenges in stabilizing ink discharge direction and enhancing printing quality due to variations in ink flow resistance and temperature fluctuations, which affect the deformation and pressure generation necessary for reliable inkjet printing.
Innovation Solution
The ink jet head design incorporates axially symmetrical electrodes and a piezoelectric film actuator surrounding the nozzle hole, with a silicon wafer ink pressure chamber and stainless steel supply path structure to maintain consistent ink flow resistance and temperature stability, ensuring predictable ink discharge direction and improved printing quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a piezoelectric element is used to discharge ink, then ink droplets can be discharged according to image signals, but variations in ink flow resistance and temperature fluctuations cause unstable deformation and inconsistent discharge direction
Solution Approach 1:
The patent applies parameter changes by controlling the polarization direction of the piezoelectric element to be orthogonal to the ink discharge direction, and by optimizing the electrode arrangement (individual electrodes on one side, common electrode on the other side) to achieve stable and predictable deformation behavior under electric field application, thereby resolving the instability caused by variations in ink flow resistance and temperature fluctuations
2Manufacturing precision
If temperature fluctuations occur, then ink flow resistance varies, but this causes unpredictable piezoelectric element deformation and misdirection of ink discharge
Solution Approach 1:
The patent addresses temperature stability by optimizing the piezoelectric element configuration including polarization direction orthogonal to discharge direction, electrode material selection, and electrode arrangement patterns. These parameter optimizations ensure that the piezoelectric element deforms predictably even when temperature fluctuates, maintaining manufacturing precision and printing quality
3Reliability
If the piezoelectric element deformation is unstable, then ink discharge direction becomes inconsistent, but printing quality requires reliable and stable discharge direction
Solution Approach 1:
The patent resolves the contradiction between reliability and manufacturing precision by optimizing multiple parameters: setting polarization direction orthogonal to discharge direction, arranging individual electrodes on one side and common electrode on the other side, and selecting appropriate electrode materials. These parameter changes ensure stable piezoelectric deformation and consistent ink discharge direction, thereby achieving high printing quality
Solution Approach 2:
The patent implements feedback through the electrode arrangement where individual electrodes and common electrode create a controlled electric field that provides feedback to the piezoelectric element deformation. This feedback mechanism ensures that the deformation remains stable and predictable, maintaining consistent discharge direction and high printing quality
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
The design stabilizes the ink discharge direction and enhances printing quality by maintaining consistent ink flow resistance and temperature stability, preventing misdirection and improving image formation in inkjet printing.
Implementation Method 1
A piezoelectric element-type ink jet head discharges ink stored in an ink chamber from nozzles using deformation of piezoelectric elements. The piezoelectric element is an element that converts a voltage applied thereto into movement. When an electric field is exerted on the piezoelectric element, elongation or shear deformation occurs.
Data Source
AI summary
According to one embodiment, an ink jet head includes an ink pressure chamber, a nozzle hole, a vibrating plate, an actuator, and electrodes. The ink pressure chamber stores ink which is discharged through the nozzle hole. The vibrating plate is formed to surround the nozzle hole. The actuator drives the vibrating plate. The electrodes are formed to be axially symmetrical with respect to the nozzle hole and drive the actuator.