Piezoelectric Head Unit with Integrated Determination Circuit
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Solution Overview
Problem
Existing liquid discharge devices, such as inkjet printers, face issues with accurately determining the functionality of piezoelectric elements, leading to potential malfunctions and image quality deterioration due to noise interference when determining circuits are external to the head unit.
Innovation Solution
A head unit with an integrated determination circuit and discharge limitation circuit minimizes noise interference by performing drive signal determination and stopping the piezoelectric element's operation within the unit, ensuring accurate power storage capability assessment and preventing defective element usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the determination circuit is provided to the exterior of the head unit, then the device complexity is reduced, but the measurement precision deteriorates due to noise interference during signal transmission
Solution Approach 1:
The patent integrates the determination circuit directly into the head unit, merging the determination function with the discharge section. This eliminates the need for external circuitry while ensuring that potential measurements are performed locally without noise contamination from signal transmission, thereby maintaining high measurement precision while managing device complexity through functional integration.
2Ease of operation
If the determination circuit is provided to the exterior of the head unit, then the ease of operation is improved, but the reliability deteriorates due to potential noise interference affecting drive determination
Solution Approach 1:
By integrating the determination circuit within the head unit, the system ensures that potential measurements are performed locally at the source, eliminating noise interference from signal transmission. This integration maintains reliability by ensuring accurate drive determination while preserving ease of operation through automated local assessment of piezoelectric element functionality.
3Ease of operation
If the drive signal is not stopped rapidly when determination is negative, then the ease of operation is maintained, but the harmful factors increase due to continued operation of defective piezoelectric elements causing image quality deterioration
Solution Approach 1:
The system implements a feedback mechanism where the determination circuit continuously monitors piezoelectric element functionality, and the discharge limitation circuit responds immediately when a defect is detected. This closed-loop control ensures that defective elements are rapidly identified and stopped, preventing image quality deterioration while maintaining operational simplicity through automated protection.
Solution Approach 2:
The discharge limitation circuit is pre-configured to stop the drive signal to defective piezoelectric elements as soon as a determination is made. This preliminary protective action prevents harmful discharge patterns from developing, thereby preventing image quality issues before they occur while maintaining ease of operation through automatic intervention.
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 solution enables reliable and rapid identification of defective piezoelectric elements, preventing image quality degradation and safety issues by stopping the drive signal internally, thus ensuring consistent printing performance.
Implementation Method 1
a piezoelectric element that is configured to be displaced in accordance with changes in potential of a drive signal when the drive signal is supplied
Data Source
AI summary
A head unit includes a discharge section, a determination circuit, and a discharge limitation circuit. The discharge section is equipped with a piezoelectric element that is configured to be displaced in accordance with changes in potential of a drive signal when the drive signal is supplied. The discharge section is configured to discharge a liquid in accordance with displacement of the piezoelectric element. The determination circuit is configured to determine whether or not the piezoelectric element has a predetermined power storage capability. The discharge limitation circuit is configured to stop supply of the drive signal to the piezoelectric element and limit discharging of liquid from the discharge section when a result of determination is negative.