Laserdrukker: Verskil tussen weergawes
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The first commercial implementation of a laser printer was the [[IBM]] [[IBM model 3800 laser printer|model 3800]] in [[1976]], used for high-volume printing of documents such as invoices and mailing labels. It is often cited as "taking up a whole room," implying that it was a primitive version of the later familiar device used with a [[personal computer]]. While large, it was designed for an entirely different purpose. Many 3800s are still in use. |
The first commercial implementation of a laser printer was the [[IBM]] [[IBM model 3800 laser printer|model 3800]] in [[1976]], used for high-volume printing of documents such as invoices and mailing labels. It is often cited as "taking up a whole room," implying that it was a primitive version of the later familiar device used with a [[personal computer]]. While large, it was designed for an entirely different purpose. Many 3800s are still in use. |
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[[Image:Pa 1977 9700-medium.jpg| |
[[Image:Pa 1977 9700-medium.jpg|links|duimnael|250px|links|Xerox 9700 laser printer (ca. 1977)]] |
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The first laser printer designed for use with an individual computer was released with the [[Xerox Star]] 8010 in [[1981]]. Although it was innovative, the Star was an expensive ($17,000) system that was only purchased by a small number of laboratories and institutions. After [[personal computer]]s became more widespread, the first laser printer intended for a mass market was the [[Hewlett-Packard|HP]] [[LaserJet]] 8ppm, released in [[1984]], using a [[Canon (company)|Canon]] engine controlled by HP software. The HP LaserJet printer was quickly followed by other laser printers from [[Brother Industries]], [[IBM]], and others. |
The first laser printer designed for use with an individual computer was released with the [[Xerox Star]] 8010 in [[1981]]. Although it was innovative, the Star was an expensive ($17,000) system that was only purchased by a small number of laboratories and institutions. After [[personal computer]]s became more widespread, the first laser printer intended for a mass market was the [[Hewlett-Packard|HP]] [[LaserJet]] 8ppm, released in [[1984]], using a [[Canon (company)|Canon]] engine controlled by HP software. The HP LaserJet printer was quickly followed by other laser printers from [[Brother Industries]], [[IBM]], and others. |
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== Steganographic anti-counterfeiting ("secret") marks == |
== Steganographic anti-counterfeiting ("secret") marks == |
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[[Image:Printermarkrp.jpg|duimnael| |
[[Image:Printermarkrp.jpg|duimnael|regs|Small yellow dots on white paper, generated by a color laser printer (scale: 0.1mm). Click for a larger image.]] |
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{{mainarticle|Printer steganography}} |
{{mainarticle|Printer steganography}} |
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Many modern color laser printers mark printouts by a nearly invisible dot [[raster]], for the purpose of identification. |
Many modern color laser printers mark printouts by a nearly invisible dot [[raster]], for the purpose of identification. |
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Wysiging soos op 10:44, 16 Januarie 2019
'n Laserdrukker is 'n algemene tipe rekenaardrukker wat vinnig hoë-kwaliteit teks- en grafiese drukwerk op gewone papier kan lewer. Laserdrukkers gebruik net soos fotostaatmasjiene 'n xerografiese drukproses maar verskil van analoë fotostaatmasjiene deurdat die beeld geskep word deur 'n laserstraal oor die drukker se fotoreseptor te skandeer.
Oorsig
Die gebruik van laserdrukkers het baie voordele bo ander soorte drukkers. Anders as by impakdrukkers is 'n laserdrukker se spoed veranderlik. Dit hang grootliks af van die hoeveelheid besonderhede wat vervat is in die grafiese beeld wat verwerk word. Die vinnigste modelle kan soveel as 200 monochroom bladsye per minuut lewer (d.w.s. 12 000 bladsye per uur). Die vinnigste kleurlaserdrukkers kan soveel as 100 bladsye per minuut lewer (oftewel 6 000 bladsye per uur). Hoë-snelheidslaserdrukkers word gebruik vir massapos van verpersoonlikte dokumente soos kredietkaart- en munisipale rekeninge en kompeteer goed met litografie in sommige kommersiële toepassings. (Die Xerox 9700 laser drukker, druk sowat 120 bladsye per minuut [1].)