Patent ID: 6831392
Filing Date: 2004-12-14
Classification: B41J

Abstract:
A piezoelectric element driving circuit for driving a plurality of piezoelectric elements disposed in a plurality of head units, comprising:a plurality of power amplifiers for driving the plurality of piezoelectric elements disposed in the plurality of head units; a plurality of first switch devices, disposed corresponding to said plurality of power amplifiers, having a plurality of connection/disconnection switches whose input side is short-circuited; a plurality of flexible cables connected to the connection/disconnection switches of said plurality of first switch devices; and a plurality of second switch devices, disposed corresponding to said plurality of head units, having a plurality of connection/disconnection switches whose input side is connected to said plurality of flexible cables and whose output side is short-circuited and connected to the plurality of head units, wherein the output side of the connection/disconnection switches of said plurality of first switch devices and the input side of the connection/disconnection switches of said plurality of second switch devices are paired and connected, wherein the connection/disconnection of the connection/disconnection switches of said plurality of first switch devices and said plurality of second switch devices is controlled corresponding to the number of piezoelectric elements to be driven so as to decrease the time constant of said plurality of power amplifiers to a predetermined value or less.