Liquid ejection device and printhead
By setting an independent temperature detection unit in the liquid ejection device and electrically connecting it to the wiring board to detect the temperature of the pressure chamber, the problem of reduced temperature detection accuracy inside the printhead is solved, achieving higher temperature detection accuracy and device stability.
CN117799316BActive Publication Date: 2026-07-14SEIKO EPSON CORP
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SEIKO EPSON CORP
- Filing Date
- 2023-09-27
- Publication Date
- 2026-07-14
AI Technical Summary
Technical Problem
In existing liquid ejection devices, the internal temperature detection unit of the printhead leads to reduced accuracy of pressure chamber temperature detection, which needs to be improved.
Method used
In the liquid ejection device, a temperature detection unit is set on the other side of the vibrating plate and electrically connected to the wiring board. It detects the temperature information of the pressure chamber and inputs it into the control circuit during a constant first drive signal, and outputs the temperature information.
Benefits of technology
This improves the accuracy of pressure chamber temperature detection, ensuring the stability and accuracy of the liquid ejection device.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN117799316B_ABST
Abstract
The present application provides a liquid ejection device and a print head that can solve problems caused by a temperature detection unit provided inside the print head. The liquid ejection device includes a control circuit that outputs a control signal, a first drive signal output circuit that outputs a first drive signal, and a print head that receives the control signal and the first drive signal and ejects a liquid, the print head including a piezoelectric element that receives the first drive signal and is driven, a vibrating plate that deforms under the driving of the piezoelectric element, a pressure chamber substrate that is provided with a plurality of pressure chambers whose volumes change according to the deformation of the vibrating plate, a switching circuit that switches whether the first drive signal is supplied to the piezoelectric element, a wiring substrate that is provided with the switching circuit, and a temperature detection unit that detects temperature information of the pressure chambers, and the temperature information detected by the temperature detection unit during a period in which the voltage value of the first drive signal is constant is input to the control circuit.
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