Print Head Temperature Sensing Timed to Stable Drive Voltage
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Solution Overview
Problem
Existing liquid ejecting apparatuses with piezoelectric elements lack accurate temperature detection and control, leading to inefficiencies in ink ejection due to variations in ink temperature.
Innovation Solution
Incorporating a temperature information output circuit with a timing control circuit to accurately acquire temperature information and adjust the timing of drive signal acquisition based on voltage stability, ensuring precise ink ejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature detection is performed continuously, then temperature information can be obtained at any time, but power consumption increases and measurement accuracy decreases due to noise from drive signals
Solution Approach 1:
The timing control circuit determines in advance whether the drive signal voltage is constant before acquiring temperature information. This preliminary check ensures that temperature measurement is only performed when electrical noise from drive signals will not interfere, thereby maintaining high measurement precision without requiring continuous monitoring.
Solution Approach 2:
The timing control circuit uses feedback from the drive signal voltage status to control the timing of temperature information acquisition. By continuously monitoring the drive signal voltage and using this feedback to determine appropriate measurement timing, the system achieves accurate temperature detection while minimizing power consumption and avoiding noise interference.
2Measurement precision
If drive signal voltage is monitored continuously, then timing control accuracy is improved, but power consumption and circuit complexity increase
Solution Approach 1:
The timing control circuit extracts only the necessary information (whether drive signal voltage is constant) from the drive signal without requiring continuous detailed analysis. This selective extraction of critical timing information reduces circuit complexity while maintaining sufficient timing control accuracy for the temperature measurement function.
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 and consistency of ink ejection by accounting for temperature variations, improving print quality and reliability.
Implementation Method 1
a print head that ejects a liquid by receiving a drive signal
Implementation Method 2
a temperature detection circuit that detects a temperature of a print head
Data Source
AI summary
A liquid ejecting apparatus includes a drive circuit that outputs a drive signal, a print head that ejects a liquid by receiving the drive signal, and a temperature information output circuit that acquires a head temperature signal corresponding to a temperature of the print head, in which the temperature information output circuit includes a temperature information acquisition circuit that acquires, from the head temperature signal, temperature information corresponding to the temperature of the print head, and a timing control circuit that controls a timing at which the temperature information acquisition circuit acquires the temperature information, and the timing control circuit determines whether or not a voltage value of the drive signal is constant, and outputs a timing control signal for controlling, based on a determination result, the timing at which the temperature information acquisition circuit acquires the temperature information.