The small character inkjet printer is also what people often call the continuous inkjet printer, that is, the CIJ inkjet printer. Its working principle is that under the action of pressure, the ink enters the spray chamber, and a crystal oscillator is installed in the spray chamber. , through vibration, the ink is ejected from a nozzle with a very small aperture (generally 60 microns) to form fixed intervals. Through CPU processing and phase tracking, some ink dots through the charging electrode are charged with different electric cores. Different deflections occur under the high-voltage magnetic field of several thousand volts, and the flying nozzle lands on the surface of the moving product to form a dot matrix, thereby forming text, numbers or graphics.