Optical scanner with a constant scan rate system

Details Optical scanner with a constant scan rate system Optical scanner with a constant scan rate system

H - Electricity

04

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178/3

H04N 1/04 (2006.01) H04N 1/047 (2006.01) H04N 1/113 (2006.01) H04N 1/193 (2006.01)

Patent

CA 1121733

OPTICAL SCANNER WITH A CONSTANT SCAN RATE SYSTEM Abstract of the Disclosure An optical scanner for scanning an image on a document to produce an electrical signal representing the image density of the image at successively scanned points positioned along a scan line on the document includes a platen for supporting the document in a scan plane. A rotatable mirror in the scanner optical system is rotated at a non-uniform angular velocity to scan the document at a controlled scan rate which may be selected as a uniform scan rate. Rotation of the mirror is controlled by means of a servo control loop responsive to a reference signal and to the output of a reference transducer which receives light from a reference grating as the mirror is rotated.

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