Head driver for liquid jetting apparatus
AssigneeSeiko Epson Corporation
InventorAtsushi Umeda
Life of this patent
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Abstract
A head drive circuit is adapted to selectively drive piezoelectric elements for ejecting liquid droplets from a liquid jetting head of a liquid jetting apparatus. A charger is adapted to apply a bias voltage to ground-side electrodes of the piezoelectric elements. An anomalous voltage detector outputs a detection signal when a charging voltage of the charger is a predetermined value or more.
Claims7
A head driver for a liquid jetting apparatus, comprising:
- a head drive circuit, adapted to selectively drive piezoelectric elements for ejecting liquid droplets from a liquid jetting head;
- a charger, adapted to apply a bias voltage to ground-side electrodes of the piezoelectric elements;
- and
- an anomalous voltage detector, which outputs a detection signal when a charging voltage of the charger is a predetermined value or more.
A liquid jetting apparatus, comprising:
- a liquid jetting head, provided with nozzle orifices;
- piezoelectric elements, associated with the nozzle orifices to eject liquid droplets therefrom;
- a head drive circuit, which selectively drives the piezoelectric elements;
- a charger, which applies a bias voltage to ground-side electrodes of the piezoelectric elements;
- and
- an anomalous voltage detector, which outputs a detection signal when a charging voltage of the charger is a predetermined value or more.
A method of driving a liquid jetting head provided with piezoelectric elements which are selectively driven to eject liquid droplets, the method comprising steps of:
- applying a bias voltage to ground-side electrodes of the piezoelectric elements by a charger;
- detecting whether a charging voltage of the charger is predetermined value or more;
- and
- outputting an anomalous signal when it is detected that the charging voltage is predetermined value or more.
Dependencies are inferred from the claim text.