Print Head Temperature Signal Circuit for Precise Liquid Ejection
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Solution Overview
Problem
Existing liquid ejecting apparatuses with piezoelectric elements lack accurate temperature detection and correction mechanisms, leading to insufficient temperature acquisition accuracy of the print head, which affects ejection control.
Innovation Solution
A head unit with a temperature information output circuit that includes a first print head, a first piezoelectric element, a first vibration plate, a first pressure chamber, a first nozzle, and a first temperature detection section, along with amplification, output control, and reference voltage control circuits to correct drive signals based on temperature information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature detection section is provided in the print head to detect temperature, then temperature detection capability is achieved, but temperature acquisition accuracy remains insufficient
Solution Approach 1:
The temperature detection function is segmented into two independent parts: a temperature detection section in the print head for sensing, and a separate temperature information output circuit for signal processing. This segmentation allows each component to be optimized independently, improving overall measurement accuracy and reliability.
Solution Approach 2:
A temperature information output circuit is introduced as an intermediary between the temperature detection section and the control system. This intermediary circuit processes the raw temperature signal through amplification and reference voltage control, enhancing signal quality and measurement accuracy before transmission to the control unit.
2Measurement precision
If temperature detection is implemented in the print head, then temperature monitoring is enabled, but signal processing accuracy is insufficient
Solution Approach 1:
The temperature information output circuit performs preliminary signal processing actions before the temperature data is used for ejection control. The amplification circuit pre-amplifies the weak temperature signal, and the reference voltage control circuit pre-adjusts voltage levels, ensuring high-quality signal input to the control unit and improving measurement precision.
3Manufacturing precision
If drive signals are corrected based on temperature information, then ejection precision is improved, but system complexity increases
Solution Approach 1:
A feedback mechanism is implemented where the temperature information output circuit continuously monitors temperature and provides corrected drive signals to the piezoelectric element. The control unit adjusts ejection parameters based on real-time temperature feedback, maintaining high ejection precision under varying thermal conditions.
Solution Approach 2:
The system dynamically changes drive signal parameters based on temperature information. The amplification circuit and reference voltage control circuit adjust electrical parameters in response to temperature variations, enabling the piezoelectric element to maintain optimal performance across different temperatures without requiring complex hardware modifications.
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
Improves temperature detection accuracy, enhancing the precision of liquid ejection by correcting drive signals, thereby improving the quality of printed images or deposited materials.
Implementation Method 1
a first piezoelectric element including a first electrode, a second electrode, and a first piezoelectric body... driven by receiving a drive signal; a first vibration plate located on one side of the first piezoelectric element in the first stacking direction and deformed due to drive of the first piezoelectric element; a first pressure chamber substrate located on one side of the first vibration plate in the first stacking direction and provided with a first pressure chamber having a volume that changes due to deformation of the first vibration plate
Implementation Method 2
a first temperature detection section located on another side of the first vibration plate in the first stacking direction to detect first temperature information corresponding to a temperature of the first pressure chamber and output the first temperature information as a first temperature signal
Implementation Method 3
a first amplification circuit that amplifies a difference between a first reference potential signal and the first temperature signal
Data Source
AI summary
There is provided a head unit in which a first print head that ejects a liquid includes: a first nozzle for ejecting the liquid according to change in the volume of the first pressure chamber; and a first temperature detection section that detects first temperature information corresponding to a temperature of the first pressure chamber and outputs the first temperature information as a first temperature signal, and a temperature information output circuit that outputs a temperature information signal indicating a temperature of the first print head includes: a first amplification circuit that amplifies a difference between a first reference potential signal and the first temperature signal, an output control circuit that outputs a temperature information signal according to an output of the first amplification circuit, and a reference voltage control circuit that controls a voltage value of the first reference potential signal.