Liquid injection head and liquid injection recording device

Abstract

This invention provides a liquid spray head that can improve convenience with a simple configuration. [Solution] The liquid spray head comprises a spray unit having a nozzle and a piezoelectric actuator, and a drive circuit unit that generates a drive signal for spraying liquid from the nozzle based on input data and outputs the drive signal to the piezoelectric actuator. The drive circuit unit comprises a drive waveform generation unit that generates a sloped drive waveform having a slope at least on one of the rising and falling times based on input data and a predetermined single power supply, a switch element arranged on the path between the drive waveform generation unit and the piezoelectric actuator, and a switch control unit that generates a drive signal by arbitrarily cutting out the amplitude of the sloped drive waveform by controlling a first switching operation from the ON state to the OFF state of the switch element at the rising time of the sloped drive waveform and a second switching operation from the OFF state to the ON state of the switch element at the falling time of the sloped drive waveform.

Claims

1. A spray unit having one or more nozzles for spraying liquid and a piezoelectric actuator including a pressure chamber for applying pressure to the liquid, Based on input data supplied from an external head control unit, one or more drive circuit units generate a drive signal for ejecting the liquid from the nozzle and output the drive signal to the piezoelectric actuator. Equipped with, The aforementioned drive circuit section is A drive waveform generation unit generates a sloped drive waveform having a slope in at least one of the rising and falling times, based on the input data and a predetermined single power supply. A switch element is arranged in the path between the drive waveform generation unit and the piezoelectric actuator, A switch control unit generates the drive signal by controlling a first switching operation of the switch element from the ON state to the OFF state during the rising edge of the tilt drive waveform, and a second switching operation of the switch element from the OFF state to the ON state during the falling edge of the tilt drive waveform, thereby arbitrarily cutting out the amplitude of the tilt drive waveform. A liquid spray head.

2. The switch control unit, By controlling the switching timing during the first switching operation and the second switching operation, respectively, so that the amplitude of the drive signal becomes a predetermined target voltage, The amplitude of the aforementioned tilt drive waveform is arbitrarily extracted. The liquid spray head according to claim 1.

3. The aforementioned drive circuit further includes a comparator that compares the magnitude relationship between the amplitude of the gradient drive waveform and a predetermined target voltage. The switch control unit, By controlling the first switching operation and the second switching operation, respectively, according to the comparison result between the amplitude of the gradient drive waveform in the comparator and the target voltage, The amplitude of the aforementioned tilt drive waveform is arbitrarily extracted. The liquid spray head according to claim 1.

4. The drive circuit further includes a detection unit for detecting the amplitude in the drive signal or the tilt drive waveform. The drive waveform generation unit calibrates the amplitude of the tilt drive waveform according to the detection result in the detection unit. A liquid spray head according to any one of claims 1 to 3.

5. A liquid spray head according to any one of claims 1 to 3, The head control unit and A liquid injection recording device equipped with a liquid injection system.

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