10/24: Output: Printers Types of printers: laser, inkjet, dot-matrix printers Other types: plotters, label printers, digital presses, photo printers, electrostatic.

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Presentation transcript:

10/24: Output: Printers Types of printers: laser, inkjet, dot-matrix printers Other types: plotters, label printers, digital presses, photo printers, electrostatic printers, LED printers How color printing works What to look for in a printer

Printers: General Printers two main groups: impact (dot-matrix, daisy-wheel) & nonimpact (laser, inkjet, thermal) other types: plotters, label printers, digital presses, photo printers, large-format printers color printing dot matrix printer image courtesy of epson.com, others courtesy of hp.com

Impact Printers Dot-Matrix printers: Pins are pushed by solenoids to hit a ribbon in front of the paper. Daisy-Wheel printers: Letters are pushed to hit the ribbon in front of the paper. Stamp ink onto the paper. Advantages: cheap, reliable, low CPU demand, multiple-form copying Disadvantages: loud, slow images courtesy of How Computers Work and Brother.com

Non-Impact: Inkjet Printers The ink cartridges have tiny heating elements that cause microdrops of ink to heat up and expand, shooting out of the nozzle and onto the paper. Advantage: cheap color printing images courtesy of HP.com and How Computers Work

The Ink Cartridge The ink cartridge(s) nozzle firing chamber path from reservoir thin-film resistor Cross-section of a nozzle. How does the ink get out? One of two ways: The Thermal method or the Piezo-Electric method.

How the ink gets out: thermal method Used by Hewlett Packard & Canon A thin-film resistor is heated by electric current. The resistor heats up the ink that is next to it. Nozzle Firing Chamber Resistor

How the ink gets out: thermal method The ink- now gaseous - expands, forming a bubble. The bubble pushes out the rest of the ink in the firing chamber. Nozzle Firing Chamber Resistor

How the ink gets out: thermal method The resistor cools, causing the bubble to shrink. The shrinking creates a vacuum, which draws new ink from the reservoir. Nozzle Firing Chamber Resistor The piezo method uses a flexing, swelling crystal instead of heat to push the ink out.

Laser Printers Deposit toner onto the paper, then melt it to make it permanent. Cheaper by the day – per page printing costs are very low. Faster than inkjet printers. Very quiet. images courtesy of How Computers Work

Laser printing The pattern to be printed is set up in a grid of black areas and white areas. The laser beams, horizontal line by horizontal line, this grid of dark areas.

Laser printing When the drum is hit with the laser beam, it electrically charges the coating at that spot. In HP & Canon printers, the coating is positively charged.

Laser printing As the drum rolls by, the positively charged parts of the coating on the drum attract the toner particles.

Laser printing The sheet of paper touches the drum coated in toner. The toner jumps to the paper from the drum because the paper is more strongly charged than the drum.

Laser printing The paper, with the toner particles, goes to the fusing rollers. The rollers use pressure and heat to bind the toner to the paper permanently.

How Color Printing Works subtractive color monitors use additive color: all colors combine to get lighter shades printers combine colors to get darker shades all colors together create black

Looking at printers in ads Go to http://www.buy.com things to note when comparison shopping: what YOU will be using the printer for ppm (pages per minute) in b&w, color size limitations of paper paper tray capacity price (and price of ink/toner cartridges) dpi (dots per inch) – print quality capabilities (inkjets) type of black printing: separate cartridge?