Ink jet computer printers
Well, I'm going to talk about ink jet computer printers, that I believe everybody knows, because we use them almost every day. I will present you what types of ink jet printers we know and how works each of them.
After my presentation or at home you should do the exercises, I (mr. somebody) gave you.
We know different types of ink jet printers like thermal ink jets, piezoelectric ink jets and continuous ink jets. Each of them works in a different way. Most of ink jet printers that we have at home or at work are thermal ink jets.
Thermal ink jets works by having a print cartridge with a series of tiny electrically-heated chambers constructed by photolithography. Photolithography is a process used in semiconductor device fabrication to transfer a pattern from a photomask to the surface of a substrate. To produce an image, the printer runs a pulse of current through the heating elements. A steam explosion in the chamber forms a bubble, which propels a droplet of ink onto the paper. Canon's trade name for this kind of inkjets is Bubblejet. The ink's surface tension pulls another charge of ink into the chamber through a narrow channel attached to an ink reservoir.
The ink used is usually water-based, pigment-based or dye-based but the print head is produced usually at less cost than other ink jet technologies.
Second type of ink jet printers are piezoelectric ink jets, which uses a piezoelectric crystal in each nozzle instead of a heating element. Piezoelectricity is the ability of crystals to generate a voltage in response to applied mechanical stress. When current is applied, the crystal changes shape or size, forcing a droplet of ink from the nozzle. Piezoelectric ink jet allows a wider variety of inks than thermal or continuous ink jet but is more expensive.
The oldest ink jet printers were and are continuous ink jets. In continuous ink jet technology, a high-pressure pump directs liquid ink from a reservoir...
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