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Document scanner

Document scanners are used to scan across the surface of a document and input electrical information which represents optical indicia located on the document. Document scanners have become a popular computing accessory both in the home and the office. The document scanners are generally categorized as reflective type and transmissive type. Transmissive scanners pass light through a transparent image, for example a photographic positive slide, through an optics system, and then onto an array of photosensitive devices. A typical reflective document scanner comprises a chassis arranged inside a scanner casing. Reflective document scanners typically have a controlled source of light which is reflected off the surface of a document, through an optics system, and onto an array of photosensitive devices. The photosensitive devices convert received light intensity into an electronic signal. Reflective document scanners typically have a controlled source of light which is reflected off the surface of a document, through an optics system, and onto an array of photosensitive devices. The reflective document scanners are generally employed to scan document printed on a substrate that is not light transmitting. A document scanner may be a separate device or a document scanner may be a part of a copier, part of a facsimile machine, or part of a multipurpose device. A CCD image sensor or a contact-type image sensor is commonly used in a document image scanner. There are computer software programs which read the information from the scanned image of the document and decipher and extract information from the document such as OCR (optical character reader) programs.

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