4.hardcopy devices-merin

8/7/2019 4.HARDCOPY DEVICES-MERIN

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HARD-COPY DEVICES

PRESENTED BY PRESENTED BY

MERIN MARIAM THOMASMERIN MARIAM THOMAS

ROLL NO:ROLL NO:-- 1616

S3 MCAS3 MCA



Hard-copy

HardHard copycopy isis aa relativelyrelatively permanent permanent formform of of outputoutput thatthat cancan be be readread immediatelyimmediately or or storedstoredfor for later later useuse..

OR OR HardHard--copycopy outputoutput isis anan output,output, whichwhich isis

produced produced onon aa paper paper or or somesome material,material, whichwhichcancan be be touchedtouched andand carriedcarried for for being being shownshowntoto othersothers..

Printers Printers andand plotters plotters areare thethe mostmost commoncommonhardhard copycopy outputoutput devicesdevices..

TheThe qualityquality of of thethe pictures pictures obtainedobtained fromfrom anyanyof of thethe aboveabove devicedevice dependsdepends onon dotdot sizesize andandthethe number number of of dotsdots per per inch,inch, or or lineslines per per inch,inch, thatthat cancan be be displayeddisplayed..



PRINTERS

Printers produce output by either impact or nonPrinters produce output by either impact or non--impact methods.impact methods.



Impact colorImpact colorprinters make useprinters make useof colored ribbons.of colored ribbons.

Example: lineExample: lineprinter.printer.



Printers cont«.

PrintersPrinters areare alsoalso classifiedclassified byby thethe followingfollowingcharacteristicscharacteristics

*Quality*Quality of of typetype:: TheThe outputoutput producedproduced byby

printersprinters isis saidsaid toto bebe eithereither letterletter

oror draftdraft qualityquality..*Speed*Speed:: MeasuredMeasured inin characterscharacters perper secondsecond (cps)(cps) oror

pagespages perper minuteminute (ppm),(ppm), thethe speedspeed of of

printersprinters variesvaries widelywidely..

*Impact*Impact oror nonnon--impactimpact

*Graphics*Graphics

*Fonts*Fonts



Types of Printers

*Dot matrix printer*Dot matrix printer*Laser printer*Laser printer

*Inkjet printer*Inkjet printer*The electrostatic printer*The electrostatic printer*The electro thermal printer*The electro thermal printer



1.Dot-matrix printer

DotDot--matrixmatrix printersprinters areare charactercharacter printersprinters.. TheyThey formform characterscharacters andand allall kindskinds of of imagesimages asas aa

patternpattern of of dotsdots..

ItIt hashas aa printprint headhead containingcontaining aa rectangularrectangular arrayarray of of protrudingprotruding wirewire pins,pins, withwith thethe numbernumber of of pinspins

dependingdepending inin thethe qualityquality of of thethe printerprinter.. IndividualIndividual characterscharacters oror graphicsgraphics patternspatterns areare

obtainedobtained byby retractingretracting certaincertain pinspins soso thatthat thetheremainingremaining pinspins formform thethe patternpattern toto thethe printedprinted..

DotDot--matrixmatrix printersprinters areare impactimpact printersprinters andand hencehence

noisynoisy..

TheyThey areare normallynormally slowslow withwith speedspeed rangingranging betweenbetween3030 toto 600600 cpscps..

Lesser expensive.Lesser expensive.



Dot-matrix printer



2.Laser printer

Laser printers are page printers.Laser printers are page printers.

A laser beam creates a charge distribution on a A laser beam creates a charge distribution on arotating drum coated with a photo electricrotating drum coated with a photo electric

material, such as selenium.material, such as selenium. Toner is applied to the drum an then transferredToner is applied to the drum an then transferred

to paper.to paper.

Laser printers are nonLaser printers are non--impact printers.impact printers.

They are faster in speed ,hence print 500 to 1000They are faster in speed ,hence print 500 to 1000pages per minute.pages per minute.

More expensive.More expensive.



Laser printer



3.Ink-jet printer

It produces output by squirting the ink inIt produces output by squirting the ink inhorizontal row across a roll of paperhorizontal row across a roll of paperwrapper on a drum . The electricallywrapper on a drum . The electricallycharged ink stream is deflected by ancharged ink stream is deflected by anelectric field to produce dot matrixelectric field to produce dot matrixpatterns.patterns.

They have 64 nozzles providing printThey have 64 nozzles providing printresolution of around 360 dots per inch.resolution of around 360 dots per inch.

They are nonThey are non--impact printers.impact printers.



Ink-jet printer



4.Electrostatic device

ItIt placesplaces aa negativenegative chargecharge onon thethe paperpaper ,,oneone completecomplete rowrow atat aa timetime alongalong thethelengthlength of of thethe paperpaper ..

ThenThen thethe paperpaper isis exposedexposed toto aa tonertoner ..

The toner is positively charged and so isThe toner is positively charged and so isattracted to the negatively charged areas,attracted to the negatively charged areas,where it adheres to produce the specifiedwhere it adheres to produce the specifiedoutput.output.



Electrostatic device

An electrostatic printer



5.Electro thermal device

ThisThis methodmethod usesuses heatheat inin aa dotdot--matrixmatrix printprintheadhead toto outputoutput patternspatterns onon heatheat sensitivesensitive

paperpaper..



Plotters A A plotterplotter isis anotheranother hardhard copycopy outputoutput devicedevice

thatthat reproducesreproduces graphicgraphic imagesimages onon paperpaperusingusing aa penpen thatthat isis attachedattached toto aa movablemovablearmarm..

PenPen plottersplotters cancan drawdraw complexcomplex lineline art,art,includingincluding text,text, butbut dodo soso veryvery slowlyslowly becausebecauseof of thethe mechanicalmechanical movementmovement of of thethe penspens..

A A penpen plotterplotter hashas oneone oror moremore penspens mountedmountedonon aa carriagecarriage oror crossbarcrossbar thatthat spansspans aa sheetsheet

of of paperpaper..

PensPens withwith varyingvarying colorscolors andand widthswidths areareusedused..



Plotters cont..

PlotterPlotter paperpaper cancan lielie flatflat oror bebe rolledrolled ontoonto aa drumdrum ororbeltbelt..

CrossbarsCrossbars cancan bebe eithereither moveablemoveable oror stationary,stationary,whilewhile thethe penpen movesmoves backback andand forthforth alongalong thethe barbar..

EitherEither clamps,clamps, aa vacuumvacuum oror anan electrostaticelectrostatic chargechargeholdhold thethe paperpaper inin positionposition..

Types of plottersTypes of plotters*Drum plotter*Drum plotter*Flatbed plotter*Flatbed plotter*Electrostatic plotter*Electrostatic plotter



Plotters cont..

Drum plotter Flatbed plotter

Electrostatic Plotter



References:- 1. Computer Graphics , Donald Hearn ,1. Computer Graphics , Donald Hearn ,

M.Pauline Baker.M.Pauline Baker.

2. Computer Fundamentals , P.K.Sinha.2. Computer Fundamentals , P.K.Sinha.

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