Inkjet Head Driving Waveform Control for Vibration Suppression
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Solution Overview
Problem
Existing inkjet head driving circuits face challenges in achieving fast response times without inducing unwanted high-frequency vibrations, which can deteriorate printing quality.
Innovation Solution
The proposed inkjet head driving circuit includes a waveform pattern generation unit and a driving waveform generation unit that utilize a power source and multiple switch elements to generate a driving waveform. This circuit adjusts the number of switch elements turned on during different sections of the waveform to control the actuator's operation and prevent high-frequency vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If actuator changes are made too fast to improve response speed, then response speed is improved, but unwanted high-frequency vibration occurs
Solution Approach 1:
The patent applies dynamics by making the switch element configuration adjustable during operation. The circuit transitions from a fixed switch configuration to a dynamic one where the number of switched elements can be changed in real-time based on the waveform section, allowing the system to adapt its electrical characteristics to different operational phases
Solution Approach 2:
The patent changes electrical parameters (number of switched elements, their resistance values) during different sections of the driving waveform cycle. By varying these parameters dynamically - using fewer high-resistance switches during certain phases and more low-resistance switches during others - the system controls the rate of voltage change to prevent high-frequency vibration while maintaining fast response
2Reliability
If the number of switch elements turned on is increased to reduce resistance, then current flow is improved, but response time increases
Solution Approach 1:
The driving waveform cycle is segmented into multiple sections, and the switch element configuration is optimized for each section. During initial response phases, fewer switches are activated to minimize capacitance and maximize speed. During steady-state phases, more switches are activated to reduce resistance and improve current flow stability
Solution Approach 2:
The switch element configuration is made dynamic rather than static. The circuit transitions between different switch states based on the operational phase, allowing it to exhibit low-resistance characteristics when needed for current stability and high-speed characteristics when needed for response time
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 solution effectively inhibits the occurrence of high-frequency vibrations, thereby improving the quality of printing by allowing for faster response times without compromising the stability of the actuator.
Implementation Method 1
For the actuator, a piezoelectric actuator is normally used
Data Source
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AI summary
According to one embodiment, an inkjet head driving circuit includes a waveform pattern generation unit configured to generate a waveform pattern based on input data and a driving waveform generation unit configured to generate a driving waveform for driving an actuator of an inkjet head based on the generated waveform pattern. The driving waveform generation unit includes a power source configured to supply a driving voltage for the actuator, a plurality of switch elements for connecting the power source to the actuator, and a driving waveform output unit that outputs the driving waveform to the actuator by switching of the plurality of switch elements based on the waveform pattern. The waveform pattern changes the number of switch elements that are turned on in a section of the driving waveform within one cycle of the driving waveform for causing the actuator to eject an ink droplet.