11. PC Peripherals Part III

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. Arrangement. PrintersScannersKeyboardsPointing Devices. Printers. Four principle types:Dot matrixLaserInk jetThermal color exchange and warm wax exchange. Sway versus Non-Impact. Sway printers physically exchange a spot or shape to the paperOf those in the previous slide, just dab grid uses sway printingNon-sway printers splash or set out the picture with impactImpact printers stay essential in light of the fact that

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Slide 1

11. PC Peripherals – Part III Chapt. 10

Slide 2

Plan Printers Scanners Keyboards Pointing Devices

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† Impact (the others are non-affect) Printers Four principle sorts: Dot grid Laser Ink fly Thermal color exchange and warm wax exchange

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Impact versus Non Impact printers physically exchange a speck or shape to the paper Of those in the first slide, just spot network utilizes affect printing Non-affect printers splash or set out the picture with effect Impact printers stay essential since they can print multi-part frames

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Printers Four primary sorts: Dot lattice Laser Ink stream Thermal color exchange and warm wax exchange

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How it works A print-head moves forward and backward before structures (paper) on which characters or realistic pictures are exchanged. The print-head contains various wires, regularly from 9 to 24. Each wire is a piece of a solenoid-like unit. A heartbeat connected to the solenoid makes an attractive field which drives the wire to propel quickly then in reverse. As the wire advances, it presses against a print strip containing ink. The effect exchanges an ink dab to the paper. The paper is upheld from behind by a platen.

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Demo (well, kind of)

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One print wire Side view Dot Matrix Print Head Print wires (e.g., 12) Front view

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Paper Print wire Platen Ribbon Side view Front view Dot Matrix Impact Printing Side view

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Specifications cps characters every second Varies by nature of print (e.g., draft versus last) lpm lines every moment (identified with cps) Forms Maximum number of layers of paper that can by printed at the same time Specified as n - part shapes (e.g., 4-section frames) mtbf Mean time between disappointment (e.g., 6000 hours)

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Noise Dot network printers are famously uproarious! This is a noteworthy weakness in numerous conditions

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Uses Primarily two: Any circumstance that requires multi-part shapes Small printers, for example, Calculators Adding machines Point-of-offer terminals

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Dot Matrix Printer Example - 1 Specifications 800 cps 400 lpm 6-section frames (max) FormsMaster 8000 by Printek, Inc. http://www.printek.com

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Dot Matrix Printer Example - 2 Specifications Printhead wires: 9 Printhead life: 200 million characters Print speed: close letter quality: 105 cps utility: 420 cps rapid draft: 550 cps Number of duplicates: 8 MTBF: 8000 hours @ 25% obligation cycle, 35% thickness Pacemaker 3410 by OKI Data, Inc. http://www.okidata.com

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Printers Four principle sorts: Dot grid Laser Ink fly Thermal color exchange and warm wax exchange

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Laser Photosensitive drum Spinning mirror How it functions Four stages A laser is let go in correspondence to the dabs to be printed. A turning mirror causes the dabs to be fanned out over the drum. The drum turns to the following line, generally 1000 th or 1600 th of an inch. The drum is photosensitive. Subsequently of the laser light, the drum turns out to be electrically charged wherever a dab is to be printed.

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Laser Photosensitive drum Spinning mirror Operation of a Laser Printer Four stages A laser is let go in correspondence to the spots to be printed. A turning mirror causes the dabs to be fanned out over the drum. The drum pivots to the following line, typically 1000 th or 1600 th of an inch. The drum is photosensitive. Therefore of the laser light, the drum turns out to be electrically charged wherever a dab is to be printed.

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Laser Photosensitive drum Spinning mirror Operation of a Laser Printer Four stages A laser is let go in correspondence to the specks to be printed. A turning mirror causes the specks to be fanned out over the drum. The drum turns to the following line, normally 1000 th or 1600 th of an inch. The drum is photosensitive. Therefore of the laser light, the drum turns out to be electrically charged wherever a spot is to be printed.

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Operation of a Laser Printer 2. As the drum keeps on turning, the charged some portion of the drum goes through a tank of dark powder called toner. Toner adheres to the drum wherever the charge is available. In this manner, the example of toner on the drum coordinates the picture. Toner

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Charge wire Paper Operation of a Laser Printer 3. A sheet of paper is bolstered toward the drum. A charge wire coats the paper with electrical charges. At the point when the paper contacts the drum, it grabs the toner from the drum

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Fusing framework Corona wire Operation of a Laser Printer 4. As the paper moves from the drum, it ignores a warmth and weight territory known as the intertwining framework. The melding framework liquefies the toner to the paper. The printed page then leaves the printer. As a similar time, the surface of the drum disregards another wire, called a crown wire. This wire resets the charge on the drum, to prepared it for the following page.

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Specifications ppm Pages every moment Typically 4-10 ppm dpi Dots for each inch Typically 600-1200 dpi

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Laser Printer Example Laserjet 5000 Series from Hewlett Packard Co. (http://www.hp.com)

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Printers Four fundamental sorts: Dot grid Laser Ink fly Thermal color exchange and warm wax exchange

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Background Inkjet innovation was produced in the 1960s First marketed by IBM in 1976 with the 6640 printer Cannon and Hewlett Packard created comparable innovation Also called bubble fly

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How it works Characters and illustrations are "painted" line by line to from an example of specks as a print head examines on a level plane over the paper. An ink-filled print cartridge is joined to the inkjet's print head. The print head contains at least 50 ink-filled chambers, each connected to a spout. An electrical heartbeat moves through thin resistors at the base of each chamber. At the point when current courses through a resistor, the resistor warms a thin layer of ink at the base of the chamber to more than 900 degrees Fahrenheit for a few millionths of a moment . The ink bubbles and structures a rise of vapor. As the vapor bubble grows, it pushes ink through the spout to shape a bead at the tip of the spout. The bead splashes onto the paper. The volume of the shot out ink is around one millionth that of a drop of water from an eye-dropper. A run of the mill character is shaped by a variety of these drops 20 crosswise over and 20 high. As the resistor cools, the air pocket breakdown. The subsequent suction pulls crisp ink from the joined store into the terminating chamber.

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Inkjet Printer Example

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Printers Four primary sorts: Dot lattice Laser Ink fly Thermal color exchange and warm wax exchange

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How it works Thermal color exchange printers , likewise called color sublimation printers , warm strips containing color and after that diffuse the colors onto uniquely covered paper or transparencies. These printers are the most costly and slowest, yet they create constant tone pictures that copy genuine photos. Take note of that you require exceptional paper, which is very costly. Another type of warm color exchange printers, called preview printers, create little photographic depictions and are a great deal less costly than their full-measure cousins. Warm wax exchange printers utilize wax-based inks that are liquefied and afterward set down on standard paper or transparencies. Not at all like warm color exchange printers, these printers print pictures as spots, which implies that pictures must be dithered first. Therefore pictures are not exactly photograph sensible, despite the fact that they are great. The enormous points of interest of these printers over warm color exchange printers are that they don't require exceptional paper and they are speedier.

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dark dim light dim white Dithering is making the dream of new hues and shades by fluctuating the example of spots. Daily paper photos, for instance, are dithered. In the event that you look carefully, you can see that distinctive shades of dim are delivered by shifting the examples of highly contrasting spots. There are no dark spots by any means. The more dither examples that a gadget or program underpins, the more shades of dim it can speak to. In printing, dithering is normally called halftoning , and shades of dark are called halftones. Take note of that dithering contrasts from dark scaling . In dark scaling, every individual spot can have an alternate shade of dim.

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Plan Printers Scanners Keyboards Pointing Devices

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How it works A scanner works by digitizing a picture. A checking system comprises of a light source and a line of light sensors. As light is considered from individual focuses the page, it is gotten by the light sensors and meant computerized signals that compare to the brilliance of each point. Shading channels can be utilized to deliver shading pictures, either by giving various sensors or by examining the picture three circumstances with a different shading channel for each pass. The determination of scanners is like that of printers, roughly 300-600 dpi (dabs per inch).

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Scanners Three primary sorts Flatbed Sheet-bolstered Handheld

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Flatbed Scanner Example

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Sheet-encouraged Scanner Example OfficeJet Series 700 from Hewlett Packard Co (http://www.hp.com)

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Handheld Scanner Example QuickScan GP Bar Code Scanner from PSC, Inc. (http://www.pscnet.com)

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Plan Printers Scanners Keyboards Pointing Devices

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Examples Natural console by Microsoft Internet console by Microsoft

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Keyboard Connectors

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Plan Printers Scanners Keyboards Pointing Devices

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Examples

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