Print Head Temperature Correction Circuit for Dispensing Accuracy
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Solution Overview
Problem
The accuracy of temperature detection in liquid dispensing apparatuses, particularly those using piezoelectric elements, decreases over time due to internal temperature detectors, leading to suboptimal dispensing control.
Innovation Solution
A head unit with a temperature information output circuit that corrects temperature signals based on unit temperature information, utilizing a piezoelectric element, vibration plate, and temperature signal acquisition unit to improve temperature detection accuracy and dispensing control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature detector is provided inside the print head, then the temperature detection accuracy is improved initially, but the detection accuracy decreases with use over time
Solution Approach 1:
The system separates temperature detection functions into two independent components: a unit temperature detection circuit for the head unit and a temperature signal acquisition unit for the print head. This segmentation allows each component to perform its specific detection function optimally without interference, resolving the contradiction between initial accuracy and long-term stability.
Solution Approach 2:
A correction circuit acts as an intermediary between the unit temperature detection circuit and the temperature information output circuit. This correction circuit processes the temperature signal by applying correction values based on detection history, thereby maintaining accurate temperature information even as the print head ages or conditions change.
2Measurement precision
If temperature detection is performed continuously, then temperature control accuracy is improved, but energy consumption increases
Solution Approach 1:
The system performs temperature detection periodically rather than continuously. The correction circuit updates correction values at predetermined intervals based on the count value reaching specific thresholds, reducing energy consumption while maintaining adequate temperature control accuracy through periodic measurements and corrections.
Solution Approach 2:
The temperature information output circuit uses its own detection history and correction values to maintain accurate temperature information without requiring continuous external intervention or additional detection resources, achieving energy-efficient self-maintained temperature control.
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
Enhances the accuracy of temperature detection and dispensing control by correcting temperature signals, leading to improved ink dispensing precision and consistency.
Implementation Method 1
a piezoelectric element including a first electrode, a second electrode, and a piezoelectric body located between the first electrode and the second electrode in a stacking direction in which the first electrode, the second electrode, and the piezoelectric body are stacked, the piezoelectric element being configured to be driven when receiving the drive signal
Data Source
AI summary
Provided is a head unit including a unit temperature detection circuit configured to output a unit temperature signal including unit temperature information indicating a temperature of the head unit, a print head configured to dispense liquid when receiving a drive signal, a dispensing counter configured to count a dispensing timing of the liquid from the print head, and a temperature information output circuit configured to acquire a temperature signal indicating a temperature of the print head and output a temperature information signal based on the temperature signal, in which the print head includes a temperature signal acquisition unit located at the other side in a stacking direction with respect to a vibration plate and configured to acquire temperature information corresponding to a temperature of a pressure chamber and output the acquired temperature information as the temperature signal, the temperature information output circuit includes a correction circuit configured to correct the temperature signal, and the correction circuit corrects the temperature signal based on the unit temperature information at a predetermined timing after a count value of the dispensing timing reaches a predetermined value.