Inkjet head, driving device of inkjet head and driving method thereof

摘要

A driving device of an inkjet head including a pressure chamber for accommodating ink, a nozzle that communicates with the pressure chamber to eject the ink in the pressure chamber, and an actuator for expanding or contracting a volume of the pressure chamber, is provided with a drive circuit that applies a driving signal to the inkjet head. The driving signal includes: a first contracting pulse, a first expanding pulse following the first contracting pulse, a second contracting pulse following the first expanding pulse, a second expanding pulse following the second contracting pulse, and a third contracting pulse following the second expanding pulse.

主权项

1. A driving device for an inkjet head including a pressure chamber for accommodating ink, a nozzle that communicates with the pressure chamber to eject the ink in the pressure chamber, and an actuator for expanding or contracting a volume of the pressure chamber, the driving device comprising:
a drive circuit configured to apply a driving signal to the inkjet head, the driving signal including:
a first contracting pulse that causes the actuator to contract the volume of the pressure chamber and a meniscus of ink to move in an ejecting direction in the nozzle,a first expanding pulse following the first contracting pulse that causes the actuator to expand the volume of the pressure chamber and the meniscus of ink to move in a direction opposite the ejecting direction,a second contracting pulse following the first expanding pulse that causes the actuator to contract the volume of the pressure chamber and the meniscus of ink to move in the ejecting direction and form an ink column extending from the nozzle,a second expanding pulse following the second contracting pulse that causes the actuator to expand the volume of the pressure chamber and the meniscus of ink to move in the direction opposite the ejecting direction and cut off the ink column to form an ink droplet, anda third contracting pulse following the second expanding pulse that causes the actuator to contract the volume of the pressure chamber and substantially cancel a pressure vibration in the pressure chamber.