| 摘要 |
A head drive apparatus of an ink jet printer is provided that enables rapid rise and fall of a drive signal to an actuator and does not require a cooling plate radiator or the like. A modulator 24 compares an analog drive waveform signal WCOM to control drive of an actuator outputted from a drive waveform generator 70 with a triangular wave to obtain a modulated signal. A digital power amplifier 25 amplifies the power of the modulated signal. A low pass filter 26 smoothes the power-amplified modulated signal subjected to the power amplification to obtain a drive signal COM to the actuator. A transistor such as a MOSFET in the digital power amplifier 25, which is used as a switching element, causes less power loss, and is being capable of dispensing a cooling plate radiator. Characteristics of the low pass filter 26 are set to remove only a power-amplified modulated signal component, thereby enabling rapid rise and fall of a drive signal. |
