| 摘要 |
A head drive apparatus of an inkjet printer is provided which does not require any cooling plate radiator of transistor and makes drive signals actually applied to actuators uniform. In the head drive apparatus, an analog drive waveform signal WCOM for controlling the drive of an actuator is modulated into a modulated signal by a modulator 24, and the modulated signal is power-amplified by a digital power amplifier 25, which is smoothed by a low pass filter 26 to form a drive signal COM to the actuator. MOSFETS in the digital power amplifier 25 is used as a switching element, which generates a small power loss and eliminates a cooling plate radiator. In addition, a plurality of capacitances C1 and C2 are provided in the low pass filter 26, so that the capacitances C1 and C2 are connected to the drive circuit in parallel depending on the number of the driven actuators 22, to limit the components removed from a drive signal COM by the low-pass filter to a certain amount or within a predetermined range.
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