Patent ID: 6685293
Filing Date: 2004-02-03
Classification: B41J

Abstract:
A liquid jetting apparatus, comprising:a liquid jetting head, provided with a pressure chamber, a piezoelectric vibrator which causes pressure fluctuation to the pressure chamber and a nozzle orifice communicated with the pressure chamber; a drive signal generator, which generates a drive signal including a base potential, an initial and termination potential which is a drive potential higher than the base potential, and at least one ejection pulse signal for ejecting an ink droplet from the nozzle orifice, the drive signal generating the drive signal every recording period; a drive signal supplier, which selectively supplies the ejection pulse signal to the piezoelectric vibrator in accordance with recording data which indicates whether a liquid jetting is performed; a jetting data storage, which stores the jetting data with regard to each of successive two jetting periods including a present jetting period; and a vibrator potential adjuster, which changes a potential of the piezoelectric vibrator to the base potential when the jetting data stored in the jetting data storage indicates that the liquid jetting is not performed in a latter jetting period, and changes the potential of the piezoelectric vibrator to the drive potential before the ejection pulse is supplied when the jetting data indicates that the liquid jetting is performed in the latter jetting period.