Piezo ceramics inkjet printer

                                   Piezo ceramics inkjet printer

Piezoelectric inkjet printers have several different configurations, one of which is the use of piezo ceramic cylinder thickness vibrations to extrude ink from the ink jet channels. It is composed of an array of piezoelectric actuators arranged in parallel, and two adjacent actuating members enclose an ink ejection channel, and each ink ejection channel corresponds to an piezo ceramic plate crystal. The entire print head is electrically equivalent to a series of capacitors connected in series (a piezoelectric ceramic is a capacitive load).

The voltage of the driving power supply is applied to each channel, and the voltages of adjacent frequency of piezo ceramic should satisfy certain timing relationships. . For piezoelectric actuators, the drive voltage of piezoelectric ceramic vibration sensor is the difference between the voltages on both sides of the channel. This requires the driving power supply to be able to realize the parallel driving of multiple serial loads, and each load must have an independent amplifying circuit. Piezo inkjet printer has a set of adjacent channel drive waveforms.

When one channel ejects ink, the adjacent piezoelectric transducer circuit do not work properly (vibration of the actuating element interferes with the adjacent channel) so that the channels of piezo electric disc on the print head cannot simultaneously eject ink. In general, all channels are divided into three cycles to work alternately. For example, channels 1, 4, (7)... Are the first cycle, channels 2, 5, (8) are the second cycle, and channels 3, 6, (9)... Are the third cycle. Therefore, the drivers are loaded on different channels.