HEAD UNIT AND LIQUID EJECTION APPARATUS

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HEAD UNIT AND LIQUID EJECTION APPARATUS - A simplified explanation of the abstract

This abstract first appeared for US patent application 18611784 titled 'HEAD UNIT AND LIQUID EJECTION APPARATUS

The abstract describes a patent application for a head unit that includes a piezoelectric element used to eject liquid, along with various circuits and units to control the process.

The head unit features a piezoelectric element that displaces to eject liquid based on a driving signal.
A driving signal generation unit creates the driving signal for the piezoelectric element.
A residual vibration signal generation circuit detects residual vibrations in the pressure chamber after the driving signal is supplied.
An analog differential residual vibration signal generation circuit converts the residual vibration signal into an analog form.
A demodulation circuit processes the analog differential residual vibration signal into a demodulated signal.
An AD converter converts the demodulated signal into a digital signal.
A determination unit analyzes the digital signal to determine the state in the pressure chamber.

Potential Applications: - This technology can be used in inkjet printers, medical devices, and industrial equipment that require precise liquid ejection. - It can also be applied in automotive systems for fuel injection or cooling mechanisms.

Problems Solved: - The technology addresses the need for accurate and controlled liquid ejection in various applications. - It helps in reducing waste and improving efficiency in liquid handling processes.

Benefits: - Improved precision and control in liquid ejection processes. - Enhanced reliability and performance in devices utilizing liquid ejection technology. - Potential cost savings through efficient liquid handling.

Commercial Applications: "Advanced Liquid Ejection Technology for Inkjet Printers and Medical Devices"

Questions about the technology: 1. How does the piezoelectric element contribute to the liquid ejection process? 2. What are the key advantages of using residual vibration signals in controlling liquid ejection systems?

Original Abstract Submitted

A head unit includes a piezoelectric element displaced according to a driving signal to cause a liquid to be ejected, a driving signal generation unit that generates the driving signal, a residual vibration signal generation circuit that outputs a change in an electromotive force of the piezoelectric element according to residual vibration, in a pressure chamber in communication with a nozzle, that occurs after supply of the driving signal, as a residual vibration signal, an analog differential residual vibration signal generation circuit that converts the residual vibration signal into an analog differential residual vibration signal, a demodulation circuit that demodulates the analog differential residual vibration signal and outputs a demodulated signal, an AD converter that converts the demodulated signal into a digital signal, and a determination unit that determines, based on the digital signal, a state in the pressure chamber.