Yuav ua li cas yog ib tug scanner

Muaj ntau computer peripheral pab kiag li lawm tam sim no siv nyob rau hauv lub tsev, kom txog thaum nyuam qhuav yuav tau pom xwb nyob rau hauv lub chaw ua hauj lwm ntawm loj tuam txhab uas muag. Uas yog raws nraim li cas tshwm sim rau lub computer scanner. Producers sai sai pom tau hais tias qhov no me me lag luam yog dawb, thiab twb tau pib zus tau tej cov cov budgetary ntaus ntawv hauv chav kawm ntawv, uas zog siab los siav cov kev xav tau ntawm qhov nruab nrab lub tsev neeg siv.

Txawm tias muaj tseeb hais tias cov khw muag khoom noj ntawm computer technology muaj ib tug ntau yam ntawm cov pab kiag li lawm, feem ntau ntawm cov qhua, cov lus nug tshwm sim, dab tsi yog qhov scanner. Qhov no yog heev qub, vim hais tias tus caum qab ntawm kev txawj ntse lawm. Niaj hnub no peb saib yog dab tsi yog ib tug scanner thiab dab tsi mus nrhiav rau thaum muas.

Scanner - qhov no opto-mechanical ntaus ntawv rau converting duab ntaub ntawv rau hauv cov ntawv no, uas tau khiav lag luam hauv lub computer kev pab cuam. Ntawm no yog ib tug yooj yim txhais. Txawm li cas los, nyob rau hauv thiaj li yuav ntau siab to taub dab tsi lub scanner, koj yuav tsum kawm cov internal qauv. Qhov no yuav tsis tau tsuas yog ua rau kom cov txawj ntse, tab sis kuj tso cai rau koj los mus xaiv tus qauv zoo tshaj plaws suits.

Tag nrho cov kev khiav hauj lwm scanner kuj yog yooj yim: lub luam kwv mus ncaj lub teeb rays thiab cov reflected nyob rau hauv svetoregistriruyuschie ntsiab. Vim qhov sib txawv theem ntawm thiaj (eg, xim dub qhia lub zuj zus tshaj dawb) logic tsev generates ib cov "sau" ntawm lub luam kwv. Qhov no qhia kom meej pub ntau Benefit teb rau lo lus nug ntawm yog dab tsi yog ib tug scanner, rau PP, nws puv tawm, koj muaj peev xwm txawm loj cov khoom, tsis yog phau ntawv ntawm daim ntawv, raws li muaj ntau yam ntseeg. Tab sis, tseem, to taub ntau heev tshwj xeeb ntaus ntawv tsim los ua hauj lwm nrog cov ntawv nyeem thiab graphics. Dua li ntawm qhov uas zoo sib xws hauv paus ntsiab lus ntawm lub lag luam, muaj ntau hom kev scanners.

Feem ntau cov low-end qauv yog ntsiav tshuaj pab kiag li lawm. Nyob rau hauv lawv ib daim ntawv ntawm daim ntawv coated nrog ib tug graphical ntaub ntawv yog muab tso rau ib tug pob tshab qhov rai (iav, yas) thiab tus ntaus ntawv yog pressed tiv thaiv cov sab saum toj opaque cover. Tom ntej no mus cov ntawv coj lub teeb beam thiab lub thaws rov los yuav. Cov ntsiab keeb ntawm cov scanner - matrix. Muaj ob ntawm ntau yam nws: CIS thiab CCD. Nyob rau hauv cov ntaub ntawv ntawm lub matrix ntawm cov thawj hom nyob rau hauv lub khob, uas yog muab tso rau ntawm daim ntawv, lub carriage yog ib tug multi-kab LEDs thiab photocells. Nws maj mam txav raws daim ntawv, nrog rau cov LEDs tig liab kab, xiav, ntsuab xim (tsim nyog rau tsim ntawm ib tug xim duab).

Tej qauv no tsis tshua muaj nqi thiab kev cia siab superior (tsis muaj dab tsi so) tau yog li ntawd paj yig buyers nrhiav ib tug tov rau PP nrog dawb ntawv nyeem nplooj ntawv. Yog li peb nco ntsoov tias lub PP ceev yog qeeb, yuav tsum tau ceev clamping ntawm daim ntawv rau iav, lub nruab nrab zoo dluab.

Nyob rau hauv cov qauv nrog CCD matrix diodes yog tsis nyob hauv carriage, thiab cov illumination teeb. Lub reflected teeb yog sau los ntawm ib tug system ntawm kev xav ntsoov txog tsom iav, mus nrhiav tau ib cov xim duab yog muab faib mus rau hauv lub Cheebtsam ntawm lub spectrum yog tej thiab photocells. Cov tshuaj no pub rau tau kaj thiab tiag tiag li dluab ntawm cov zis, thaum nruj nreem clutching lub iav yog tsis yuav tsum tau, txij li thaum lub teeb siv yog txaus los mus kov yeej lub luv luv deb. Ua ceev tau kuj nce ntau heev. Peb yuav hais tias hnub no nws yog ib tug zoo nkauj zoo daws. Lub disadvantage yog cov kev txwv ntawm lub teeb lub neej (nyob rau hauv lub sij hawm nws yuav tsum tau hloov, raws li txwv mus rau lub teeb-emitting diodes) thiab qhov yuav tsum tau rau ib tug sab nraud fais fab mov.

Scanners yus tob gamut (tib yam 24, 32, 48 khoom) thiab kev daws teeb meem. Nyob rau hauv cov xim khoom yuav tsum tsis tsuas cov ndlwg ntawm cov dluab, tab sis kuj lub suab nrov ntawm lub matrix nws tus kheej, li ntawd, cov ntau lub zoo dua. Nyob rau lwm cov tes, yuav tsum tsis txhob yuav rau lub tsev rau Chase lub puav - ib lub tshuab luam uas outputs lub scanned duab yog tsis tau lub cev muaj peev xwm mus tso saib 48-ntsis. Daws teeb meem yog teev raws li XXX: YYY, qhov twg «XXX» - lub tsuas me me, thiab «YYY» - lub carriage kauj ruam.