Abstract: In an ink jet printer, a print head is provided with a plurality of nozzles. Each of piezoelectric elements is associated with one of the nozzles, and is provided with a drive electrode and a common electrode. A head driver generates a drive signal for driving the piezoelectric elements, and selectively supplies the drive signal to at least one of the piezoelectric elements to eject an ink droplet from at least one associated nozzle. A bias power source applies a bias voltage having a predetermined potential to the common electrode of each piezoelectric element.

Abstract: In an ink jet printer, a print head is provided with a plurality of nozzles. Each of piezoelectric elements is associated with one of the nozzles, and is provided with a drive electrode and a common electrode. A head driver generates a drive signal for driving the piezoelectric elements, and selectively supplies the drive signal to at least one of the piezoelectric elements to eject an ink droplet from at least one associated nozzle. A bias power source applies a bias voltage having a predetermined potential to the common electrode of each piezoelectric element.

Abstract: To provide an ink jet recording apparatus wherein distorting the waveform of a drive signal can be prevented, a recording head also containing a drive signal generating circuit can be tested, and the detrimental effect when such a configuration is adopted can be avoided. In the ink jet recording apparatus, a heat radiation member 200 is placed in a recording head 100 and an IC 300 is mounted on a vertical plate section 210 of the heat radiation member 200. The IC 300 is provided with not only a head drive circuit, but also a current amplification circuit of a drive signal generating circuit for generating a drive signal to drive a pressure generating element 17. The recording head 10 is attached to a carriage in a state in which the vertical plate section 210 of the heat radiation member 200 is brought into contact with the carriage with heat radiation fins.

Abstract: In an ink-jet printer, on the basis of the previous, current, and next drive conditions held in latch circuits 252, 253, and 254, an output control section 255 switches the current drive waveform to be supplied to a pressure generation device. Therefore, the vibrating state of a vibrating state or that of an ink meniscus can be optimized by the time the next expelling of ink is performed. Accordingly, there is no need for consumption of time to wait for the next expelling of ink until the vibration of the vibrating plate or that of meniscus subsides sufficiently, thus resulting in a reduction in time intervals between ink expelling operations and implementing high-speed printing operations.