Barcode scanner

Shapeclassification

Barcodesonthemarketareroughlydividedinto:handheld,smallroller,andplatformbarcode

handheld

Thehandheldbarcodescannerisaproductformedbytechnologyintroducedin1987,anditsappearanceisverysimilartothebarcodescannerusedbythecashierinthesupermarket.ThemajorityofhandheldscannersuseCIStechnology,withanopticalresolutionof200dpi,andtherearemultipletypesofblackandwhite,grayscale,andcolor.Thecolortypeisgenerally18-bitcolor.Therearealsoafewhigh-endproductsthatuseCCDasaphotosensitivedevice,whichcanachievetruecolorwithbetterscanningeffect.

Smallrollertype

Thisisanintermediateproductofhandheldbarcodescannersanddesktopbarcodescanners(newemergenceinrecentyears,becauseofthebuilt-inpowersupplyandsmallsizeiscalled(Notebookbarcodescanner)MostoftheseproductsuseCIStechnology,theopticalresolutionis300dpi,andtherearetwokindsofcolorandgrayscale.Thecolormodelisgenerally24-bitcolor.Therearealsoafewsmallroller-typebarcodescannersthatuseCCDtechnology,andthescanningeffectissignificantlybetterthanthatofCIStechnologyproducts,butduetostructurallimitations,thevolumeisgenerallysignificantlylargerthanthatofCIStechnologyproducts.Thesmallrollerdesignistofixthelensofthebarcodescanner,andmovetheobjecttobescannedtoscanthroughthelens.Itoperateslikeaprinter.Theobjecttobescannedmustpassthroughthemachinebeforebeingsentout.Therefore,thescannedobjectcannotbesent.Theetheristoothick.Thebiggestadvantageofthisscanninggunisthatitisverysmall,butduetoitslimitations,forexample,itcanonlyscanthinpaper,andtherangecannotexceedthesizeofthescanninggun.

Platform-typebarcode

Alsoknownasflat-panelbarcodescannersanddesktopscanners,mostbarcodescannersonthemarketareflat-panelbarcodescannersandarethemainstream.Theopticalresolutionofthistypeofbarcodescannerisbetween300dpi-8000dpi,thecolordigitsrangefrom24-bitto48-bit,andthescanningformatisgenerallyA4orA3.Theadvantageoftheflatbedtypeisthataslongastheuppercoverofthescanninggunisopened,nomatteritisbooks,newspapers,magazines,andphotonegatives,itisveryconvenienttoscan,andthescannedeffectisalsoinallcommontypesofscanningguns.thebest.

Othersincludelarge-formatscanners,pen-typescanners,barcodescanners,andfilmscannersforlarge-formatscanning.Alsoexpensive),physicalscanningguns(notflatbedscanninggunswithphysicalscanningcapabilities,somewhatsimilartodigitalcameras),anddrumscanningguns,whicharemainlyusedinthefieldofindustrialprintingandtypesetting,andsoon.

Interfacetypes

Therearefourcommoninterfacetypesforbarcodescanners:

SCSI(SmallComputerStandardInterface)

Themaximumnumberofconnecteddevicesforthisinterfaceis8,usuallythemaximumtransmissionspeedis40M/S,whichisfaster,andgenerallyconnectstohigh-speeddevices.TheinstallationofSCSIdevicesismorecomplicated,andaSCSIcardisusuallyaddedtothePC,whichispronetohardwareconflicts,butithaspowerfulfunctions.

EPP(EnhancedParallelInterface)

Anenhancedtwo-wayparalleltransmissioninterfacewithamaximumtransmissionspeedof1.5Mbps.TheadvantageisthatthereisnoneedtouseothercardsinthePC,thenumberofconnectionsisunlimited(aslongasyouhaveenoughports),andthedeviceiseasytoinstallanduse.ThedisadvantageisthatthespeedisslowerthanSCSI.Thisinterfaceissimpleandconvenienttoinstallanduse,andreplacetheSCSIinterfaceinthelow-endandlow-endoccasionswhereperformanceisnothigh.

USB(UniversalSerialBusInterface)

Upto127peripheralscanbeconnected,themaximumtransmissionspeedofUSB1.1standardis12Mbps,andthereisoneTheauxiliarychannelisusedtotransmitlow-speeddata.Inthefuture,ifthereisaUSB2.0standardbarcodescanner,thespeedmaybeexpandedto480M/s.Withhotplugfunction,plugandplay.ThebarcodescannerofthisinterfaceisgraduallypopularizedwiththeestablishmentandpromotionoftheUSBstandardunderthepushofIntel.

PS2(KeyboardInterface)

TheusageissimilartothatofUSB.Itneedsasmartheadtoconvertit.Generally,itwillbeincludedinthescanner.TherearestillmanycompaniesthatusethePS2interface.

Commercialclassification

CCDscanner

TheCCDscannerusesthephotoelectriccoupling(CCD)principletoimagethebarcodeprintingpatternandthendecodeit.Itsadvantagesare:

Noshaft,motor,longservicelife;

Lowprice.

WhenchoosingaCCDscanner,themostimportantparametersaretwoparameters:

Depthoffield

SincetheimagingprincipleofCCDissimilartoacamera,ifyouwanttoincreasethedepthoffield,Thelensshouldbeenlargedaccordingly,whichmakestheCCDtoolargeandinconvenienttooperate.AnexcellentCCDcanbereadwithoutclosetothebarcode,andthesizeismoderate,andtheoperationiscomfortable.

Resolution

IfyouwanttoincreasetheCCDresolution,youmustincreasetheunitelementofthephotosensitiveelementattheimagingsite.Low-pricedCCDsaregenerally5pixels,whichissufficienttoreadcommercialcodessuchasEANandUPC,anditismoredifficulttoreadothercodesystems.Themid-rangeCCDhas1024pixelsasmany,andsomeevenreach2048pixe1,whichcandistinguishbarcodeswiththenarrowestunitelementof0.1mm.

Laserhandheld

Itisasingle-linescannerthatusesalaserdiodeasalightsource.Therearetwomaintypes:rotatingmirrorandvibratomirror.

Therotatingmirrortypeusesahigh-speedmotortodriveaprismgrouptorotate,sothatthesingle-pointlaseremittedbythediodebecomesaline.

Theproductioncostofthetremolomirrortypeislowerthanthatoftherotatingmirrortype,butthelasergunofthisprincipleisnoteasytoincreasethescanningspeed,whichisgenerally33timespersecond.

Whencommercialenterpriseschoosealaserscanner,themostimportantthingistopayattentiontothescanningspeedandresolution,whilethedepthoffieldisnotakeyfactor.Becausewhenthedepthoffieldincreases,theresolutionwillbegreatlyreduced.Agoodhand-heldlaserscannershouldhaveahighscanningspeedandahighresolutionwithinafixeddepthoffield.

Full-anglescanner

Itisabarcodescannerthatrefractsthelaserlightemittedbyalaserdiodeormultiplescanninglinesthroughanopticalsystem.Themainpurposeistoreducethetimewhenthepayeeentersthebarcodedata.Forthelaborofaligningthebarcode,payattentiontothevariegateddistributionofscanlineswhenselecting:

Therearemultipleparallellinesinonedirection;

TherearemultiplescansatacertainpointThelinepasses;

Theinterpretationprobabilityofeachpointwithinacertainspatialrangetendstobethesame.

Afull-anglescannerthatmeetstheabovethreepointsmustbethefirstchoiceformerchants

Selectparameters

Beforechoosingabarcodescanner,youmustunderstandthemainfeaturesofscanningequipmentTechnicalparameters

1,resolution

Forbarcodescanningsystems,theresolutionisthemostThewidthofthenarrowbar,EnglishisMINIMALBARWIDTH(abbreviatedasMBW).Whenselectingadevice,itisnotthatthehigherthesplittingrateofthedevice,thebetter,butthescannerwiththecorrespondingresolutionshouldbeselectedaccordingtothebarcodedensityusedinthespecificapplication.Inuse,iftheresolutionoftheselecteddeviceistoohigh,thestainanddeinkingonthebarwillhavemoreseriousimpactonthesystem.

Theresolutionofthebarcodescannershouldbedeterminedfromthreeaspects:theopticalpart,thehardwarepartandthesoftwarepart.Inotherwords,theresolutionofabarcodescannerisequaltotheresolutionofitsopticalcomponentsplustheresolutionobtainedbyitsownprocessingandanalysisthroughhardwareandsoftware.

Opticalresolutionistheactualnumberoflightpointsthattheopticalcomponentsofthebarcodescannercancapturepersquareinch,anditreferstothephysicalresolutionofthebarcodescannerCCD(orotheroptoelectronicdevices).Itisalsothetrueresolutionofthebarcodescanner.Itsvalueisthevalueobtainedbydividingthepixelpointsthatthephotoelectricelementcancapturebythemaximumscannablesizeofthebarcodescanner.Forexample,abarcodescannerwitharesolutionof1200DPIusuallyonlyaccountsfor400-600DPIintheresolutionoftheopticalpart.Theresolutionoftheextendedpartisjointlygeneratedbyhardwareandsoftware.Thisprocessisgeneratedbyanalyzingtheimagethroughacomputerandmathematicallyfillingtheblankpart(thisprocessisalsocalledinterpolationprocessing).

Opticalscanningandoutputareone-to-one,andwhatisscannediswhattheoutputis.Afterthecomputersoftwareandhardwareareprocessed,theoutputimagewillbecomemorerealisticandtheresolutionwillbehigher.Mostofthebarcodescannersonthemarkethavethefunctionofexpandingtheresolutionofsoftwareandhardware.Somebarcodescanneradvertisementswrite9600×9600DPI,whichisonlythemaximumresolutionobtainedthroughsoftwareinterpolation,notthetrueopticalresolutionofthebarcodescanner.Soforabarcodescanner,itsresolutionincludesopticalresolution(oropticalresolution)andmaximumresolution.Ofcourse,whatwecareaboutisopticalresolution,whichishardwork.

Itissaidthattheresolutionofabarcodescannerisashighas4800DPI(this4800DPIisthesumofopticalresolutionandsoftwaredifferenceprocessing),whichreferstothescanningof1squareinchwhentheimageisinputbythebarcodescannerOntheformat,4800×4800pixels(Pixel)canbecollected.Thescanningareaof​​1inchsquare,theimagesizegeneratedafterscanningwiththeresolutionof4800DPIis4800Pixel×4800Pixel.Whenscanninganimage,thehigherthescanningresolutionisset,thefinertheeffectofthegeneratedimageandthelargerthegeneratedimagefile,butthemoreinterpolatedcomponents.

2、Scanningdepthoffield

ScanningdepthoffieldmeansthatthescanningheadisallowedtoleavethebarcodeonthepremiseofensuringreliablereadingThedifferencebetweenthefarthestdistanceofthesurfaceandthedistanceoftheclosestpointwherethescannercanapproachthebarcodesurfaceistheeffectiveworkingrangeofthebarcodescanner.Somebarcodescanningdevicesdonotprovidescanningdepthoffieldindicatorsinthetechnicalindicators,butprovidescanningdistance,thatis,theshortestdistancethatthescanningheadallowstoleavethebarcodesurface.

3、Scanwidth(SCANWIDTH)

ScanThewidthindexreferstothephysicallengthofthebarcodeinformationthatcanbereadbythescanningbeamatagivenscanningdistance.

4、Scanspeed(SCANSPEED)

ScanSpeed​​referstothescanningfrequencyofthescanningbeamonthescanningtrackperunittime.

5One-timerecognitionrate

One-timerecognitionrateindicatesthenumberoftagsreadinthefirstscanandthetotalnumberofscannedtagsRatio.Forexample,iftheinformationofabarcodelabelneedstobescannedtwice,therecognitionrateis50%.Fromtheperspectiveofpracticalapplications,itisofcoursehopedthateveryscancanpass,butunfortunately,duetotheinfluenceofmanyfactors,itisimpossibletorequirearecognitionrateof100%atatime.

Itshouldbenotedthat:theone-timerecognitionratetestindicatorisonlyapplicabletothehandheldlightpenscanningrecognitionmethod.Ifthelaserscanningmethodisadopted,thescanningfrequencyofthelightbeamonthebarcodelabelisashighashundredsoftimespersecond,andthesignalobtainedbyscanningisrepeated.

6,biterrorrate

ThebiterrorrateisextremelyimportanttoreflectthemisrecognitionofamachineidentifiablelabelsystemTestindicators.Thebiterrorrateisequaltotheratioofthenumberofincorrectidentificationstothetotalnumberofidentifications.Forabarcodesystem,thebiterrorrateisamoreseriousproblemthantheone-timerecognitionrate.

Advantages

Barcodesarecomposedofasetofbarsandemptysymbolsarrangedaccordingtocertaincodingrulestorepresentcertaincharacters,numbersandsymbols.Thebarcodesystemisanautomaticidentificationsystemcomposedofbarcodesymboldesign,productionandscanning.Barcodetechnologyhasthefollowingadvantages:

1.Fastinputspeed:Comparedwithkeyboardinput,thespeedofbarcodeinputis5timesthatofkeyboardinput,anditcanrealize"instantdatainput".

2.Highreliability:theerrorrateofkeyboardinputdatais3%,theerrorrateofusingopticalcharacterrecognitiontechnologyis1in10,000,andtheerrorrateofusingbarcodetechnologyislessthan1million.one.

3.Largeamountofcollectedinformation:Thetraditionalone-dimensionalbarcodecancollectdozensofcharactersofinformationatatime,andthetwo-dimensionalbarcodecancarrythousandsofcharactersofinformationwithcertainautomaticerrorcorrection.ability.

4.Flexibleandpractical:Barcodeidentificationcanbeusedaloneasameansofidentification,oritcanbecombinedwithrelatedidentificationequipmenttoformasystemtoachieveautomaticidentification,anditcanalsobeconnectedwithothercontrolequipmenttoachieveautomaticmanagement.

Inaddition,barcodelabelsareeasytomake,therearenospecialrequirementsforequipmentandmaterials,identificationequipmentiseasytooperate,nospecialtrainingisrequired,andtheequipmentisrelativelycheap.