The first Xerox copier process was invented by a South Australian and the idea was sold to Xerox. The early devices were a wet process, using an electrically charged black ink. Light was reflected on to an original document via mirrors to a photosensitive drum. The drum sits in a bath of electrically charged ink and high voltage is fired at the drums surface. The result is simply high resistance in the area where there is stronger light, reflected from the original document, so a low charge, and high charge in the dark areas. The higher charge attracts more of the black ink, and the low charge, attracts less, so the image is transfered to the drum. The paper is picked up using rollers, and transported to a photosensitive drum. A second charge is emitted behind the paper, transferin the wet image onto the paper, followed by a heating process to fix the image to the page. A similar system is used today, but dry, charged pwder toner is used and melted onto the page using heated pressure rollers. A laser unit is now used to transmit the light onto the drum and light sensitive diodes are used to scan the original document.
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