Belin pib ua haujlwm ntawm thev naus laus zis nyob rau xyoo 1905. Cov tshuab luam ntawv niaj hnub tau nkag mus rau hauv kev lag luam hauv xyoo 1980's, txawm tias kev daws teeb meem (ntsuas hauv dots ib nti, lossis DPI) tseem qis kom txog thaum lig Xyoo 1990. Qhov no txhais tau tias "qhov koj pom yog qhov koj tau txais" scanning tsis tau, vim cov scanners poob ntau cov duab hauv kev ua haujlwm.
Thaum twg cov ntaub ntawv luam theej tau tshwm sim?
Raws li peb tau tham, cov no yog cov neeg paub peb niaj hnub no thiab tau txais kev nyiam nyob rau hauv thaum '90s. Flatbeds optically luam theej duab cov ntaub ntawv los yog cov duab thiab hloov lawv mus rau hauv daim ntawv muaj txiaj ntsig zoo rau kev lag luam thoob plaws ntiaj teb.
Ntev npaum li cas cov scanner nyob ib puag ncig?
Thawj daim duab scanner tsim los siv nrog lub computer yog lub nruas scanner. Nws tau tsim hauv 1957 ntawm US National Bureau of Standards los ntawm ib pab neeg coj los ntawm Russell A. Kirsch. Thawj daim duab puas tau luam tawm ntawm lub tshuab no yog daim duab 5 cm square ntawm Kirsch tus tub uas muaj peb hlis, Walden.
Lub khw muag khoom noj thaum twg pib siv lub tshuab luam ntawv?
Ntawm 26 Lub Rau Hli 1974, thawj qhov kev teeb tsa ntawm lub khw muag khoom lag luam nkag mus rau kev pabcuam hauv Marsh lub tsev loj hauv Troy, Ohio. Qhov no Spectra Physics qauv Tus nqi scanner, yog ib qho ntawm thawj kaum tus scanners.
Lub khw muag khoom noj dab tsi siv ua ntej barcodes?
Nyob rau xyoo 1966, National Association of Food Chains (NAFC) tso tawm ib qho kev hu xov tooj rau cov khoom lag luam uas xav tau ntau qhov kev taug qab. Nyob ib ncig ntawm lub sijhawm no, kev lag luam kev tsheb ciav hlau tau txais kev pom zoo kho qhov muag bar code tom qab xyoo ntawm kev sim los tsim cov txheej txheem kev txheeb xyuas qhov tseeb.
