Dab tsi yog daim ntawv theej rau?

Bureaucracy sawv ntau txhiab xyoo dhau los. Thaum lub sij hawm archeological excavations nyob rau hauv Egypt twb pom nyob rau hauv ib tug ntau av nplaum ntsiav tshuaj nrog rau cov tib cov ntawv nyeem. Txoj kev rov sau dua tau ua tiav raws li cov tub qhe qhia.

Thawj thawj zaug, lub tshuab uas luam tawm cov ntawv pib tau tsim los ntawm lub Kaum Hlis 7, 1806 hauv UK. Daim ntawv yog ob tog, ntub nrog luam ntawv number case. Lub invention ntawm tus naas ej "copy" belongs rau Ralph Wedgwood.

Nyob rau hauv 1820s, carbon-based luam ntawv pib pib ua lag luam. Lub ncov ntawm nws qhov chaw tuaj nyob rau hauv 70's, thaum lub tshuab luam ntawv pib tshwm ua massively. Lub txheej pib ntxiv mastic, uas tso cai rau kom tsis txhob muaj qhov tsis dhau los ntawm qhov kev xaiv yav dhau los - lub contamination ntawm txhua yam uas nws tau kov. Ua ntej qhov kev tiv thaiv cov khoom siv niaj hnub no (luam, fax), lub tshuab luam ntawv tau ntau heev nyob rau hauv kev thov. Niaj hnub no nws tsis yog li nrov thiab siv feem ntau yog nyob rau hauv xaws.

Daim ntawv luam muaj qhov me me. Ntawm ib sab ntawm nws muaj ib txheej duab, uas yuav pab tau txais ntau daim ntawv luam ntawm lub sijhawm sau ntawv, luam tawm lossis kos duab. Daim ntawv no nteg ntawm daim ntawv zoo nkauj nrog rau xim txheej. Thaum sau ntawv rau ntawm ib daim ntawv nyob rau sab saum toj, los ntawm nias lub hau, tus lej feem ntau kis mus rau daim ntawv uas muab tso rau hauv daim ntawv.

Nrog daim ntawv no, koj tuaj yeem tau txais cov ntawv luam ntawm ntau cov ntaub ntawv. Niaj hnub no, cov ntaub ntawv tshwj xeeb rau cov khoom siv tau muab faib, thiab kuj muaj ntau yam ntawm lawv npaj rau qhov sib txawv ntawm pigeonholes.

Tam sim no tam sim no, muaj daim ntawv yees duab reflex ntawv rau cov ntawv luam los ntawm cov xub-neeg (ib zaug thiab ob tog) nrog txoj kev luam ntawv. Muaj cov photoshoot photosensitive cov ntaub ntawv (tsis zoo, zoo) kom tau txais cov ntawv luam ntawm dashed thiab halftone originals los ntawm kev luam photocopying. Lwm hom yog photocamera, uas yog siv los txais cov ntawv luam los ntawm cov qauv zoo li cov neeg siv thiab cov ntawv luam tawm. Kuj siv rau thermoset carbon ntawv reflex replication nyob rau hauv thermal (infrared) rays , thiab thermally hloov cov duab nyob rau hauv lub tiaj ntawv. Photosemiconductor luam ntaub ntawv no yog sau rau ntawm qhov chaw ntawm ib tug nyias semiconductor photoactive txheej raws li zinc oxide.

Chaw ua haujlwm daim ntawv, uas yuav tau yuav nyob rau hauv ntau lub khw muag khoom, yog qhov zoo ntawm qhov sib txawv ntawm cov duab. Lub sij hawm los ua ib daim qauv yuav yog los ntawm ob peb feeb mus rau ib feeb los yog ntau dua. Nyob rau hauv lawv ua technology (kho, zaub, lwm yam) Thiab qhov ntev ntawm cia ntawm cov ntawv luam raws li muaj ntau hom ntawv.

Feem ntau, rau cov luam ntawm cov ntawv luam, cov ntawv uas tsis tau muab coj los siv, xws li thaum muaj kev sib cuag los yog hom khoom siv luam yeeb, los yog thaum tus thawj coj ua los ntawm kev siv cov ntawv luam ua haujlwm.