Portable scanner
Optical scanners are used to produce machine-readable image data signals that are representative of a scanned object, such as a photograph or a page of printed text. Optical scanners may be conveniently classified into two categories: table top and hand-held. Table top optical scanners are typically utilized to scan one or more entire pages. Handheld or portable scanners, on the other hand, are typically utilized to scan lines or selected portions of a page. A hand held or portable optical scanner is an optical scanner which is designed to be moved by hand across a scanned object, e.g., a page of text or a drawing or photograph. Such hand-held scanners provide the advantages of portability and ease of scanning textual matter not printed upon paper. For example, identification numbers printed directly upon products may easily be input via such hand-held scanners. A portable image scanner is composed of, as fundamental elements, a light source for illuminating a reading portion to be read on the objective image plane, an image sensor for converting optical image information read from the objective image plane into electric image signals, and an optical system including a converging lens for introducing reflected light from the objective image plane into the image sensor. A typical portable optical scanner may include illumination and optical systems to accomplish scanning of the object. The illumination system illuminates a portion of the object, whereas the optical system collects light reflected by the illuminated scan region and focuses a small area of the illuminated scan region onto the surface of a photosensitive detector positioned within the scanner.
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