There are two main technologies used in inkjet printers: continuous inkjet technology and random inkjet technology.
1. The continuous inkjet technology is represented by the charge modulation type. The principle of this inkjet printing is to use a piezoelectric drive device to apply a fixed pressure to the ink in the nozzle to make it continuously eject. For recording, the vibration signal of the oscillator is used to excite the jet to generate ink droplets, and the size and spacing of the ink droplets are controlled. The printing information from the character generator and the analog modulator controls the charge on the control telegram to form charged and uncharged ink drops, and then the deflection electrode changes the flying direction of the ink drops to make the ink drops that need to be printed Fly to the paper to generate character/graphic records. Ink droplets that do not participate in the recording are recovered by the catheter. For the deflection electrodes, some systems use two pairs of mutually perpendicular deflection electrodes to perform two-dimensional deflection on the ink drop printing position; some systems use multi-dimensional control of the deflection electrodes, that is, multi-dimensional deflection.
2. Random inkjet Random inkjet technology mainly includes micro piezoelectric and thermal bubble inkjet technology: thermal bubble inkjet technology, the principle of thermal bubble inkjet printing is to load ink into a very tiny capillary In, the ink is quickly heated to the boiling point by a miniature heating pad. This creates a very tiny vapor bubble, which expands and ejects a drop of ink to the top of the capillary. When the heating is stopped, the ink cools, causing the vapor to condense and contract, thereby stopping the ink flow until the next time the vapor is generated and an ink droplet is generated. The micro piezoelectric inkjet system is equipped with a transducer on the ink-filled nozzle, and the transducer is controlled by the printing signal to control the ejection of the ink.
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