| 摘要 |
An image forming apparatus (1) includes: a plurality of heads (11-1 and 11-2), each of which includes a capacitive load (46) used as an actuator for discharging ink; a drive-voltage generating circuit (191) that outputs a drive voltage to be applied to the actuator and includes a plurality of current amplifying circuits (44-1 and 44-2); and a plurality of head drivers (45-1 and 45-2) that control the actuators of the heads (11-1 and 11-2). Each of the current amplifying circuits (44-1 and 44-2) is configured to include a plurality of bipolar transistors (51a, 51b, 61a, 61b, 61c, and 61d) and to operate so as to equalize output current loads of the bipolar transistors (61a, 61b, 61c, and 61d) included in the current amplifying circuits (44-1 and 44-2), and waveforms of the drive voltages output from the current amplifying circuits (44-1 and 44-2) are combined to form a combined waveform of the drive voltages to be applied to each of the head drivers (45-1 and 45-2). |
