chapter 6 output 5. printers课件

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1、CHAPTER6outputPrinters2PrintersImpactPrintersNon-ImpactPrintersDaisywheelDot-MatrixInkjetThermalLaser3Whatisaprinter?Anexternalhardwaredeviceresponsiblefortakingcomputerdataandgeneratingahardcopyofthatdata.Printersareoneofthemostcommonlyusedperipheralsandtheyprintte

2、xtandstillimagesonthepaper.4“PrintQuality”(1)Neartypesetquality:ALowerqualityprintsimilartotheoutputofatype-writer.(2)Letterquality:Printmadeupbyfullyformed(solidline)characters.(3)Nearletterquality:Aprintofhighqualityformedbymultiplepassesofprintheadoverthesamelett

3、er.(4)Standardquality:Ahighqualityprintformedbyasinglepassoftheprinthead.(5)Draftquality:Aprintformedwithminimumnumberofdotsorlinesandaresmallerthanthestandardqualitycharacters.5“Factorsaffectingprintquality”(1)DPI:Itisameasurementofprinter’sresolutionindicatinghowm

4、anyinkdotscanbeplacedbytheprinterinonesquareinch.ThehighertheDPI,thesharperisimage.(2)Typeofprinter:Eachtypeofprinterhasitsowncapabilitiesofprinting.Sometypesofprintersproducehighqualityprintwhileotherproducelowqualityprint.(3)PrintMode:Theprintingmodemayalsoaffectt

5、hequality.Forexamplethedraftmodeincreasestheprintratebutqualityisreduced.(4)Toner:Thequalityandamountoftoneralsoaffectsprintquality.6“ImpactPrinter”Theseprintershaveamechanismthattouchesthepapertocreateanimage.Theseprintersworkbybangingaprintheadcontaininganumberofm

6、etalpinswhichstrikeaninkedribbonplacedbetweentheprintheadandthepaper.Animpactprintershowingdetailsofprinthead.sss7“Non-ImpactPrinters”Theseprinterscreateanimageontheprintmediumwithouttheuseofforce.Theydon’ttouchthepaperwhilecreatinganimage.Non-impactprintersaremuchq

7、uieterthanimpactprintersastheydon’tstrikethepaper.Anon-impactprinter8“DotMatrixPrinter”Thetermdotmatrixreferstotheprocessofplacingdotstoformanimage.Itsspeedisusually30to550characterspersecond(cps).Thisisthecheapestandthemostnoisyprinterandhasalowprintquality.DotMatr

8、ixwere1stintroducedbyCentronicsin1970.9HowDot-Matrixworks?Thedotmatrixformsimagesonecharacteratatimeastheprintheadmovesacrossthepaper.Uses