Original reading apparatus Patent #: 4907097
ApplicationNo. 674879 filed on 07/03/1996
US Classes:358/461, Shade correction358/464, To distinguish intelligence from background358/496, Document moves during scanning358/497, Scanning element moves relative to a flat stationary document358/498Document feed
ExaminersPrimary: Coles, Edward L.
Assistant: Lamb, Twyler
Attorney, Agent or Firm
Foreign Patent References
International ClassesH04N 001/40
Foreign Application Priority Data1995-07-04 JP
AbstractA reading device, having both modes of a book scanner and a sheet scanner, to be used in a handling apparatus having a function for selecting a reference white plate. The reading device includes a reading unit, a first reference white plate, which is mounted within an area where an original document is transferred and where therefore dust may be carried and raised thereabouts. The first reference white plate is usually read by the reading unit in the sheet scanner mode. A second reference white plate is mounted out of an area of a transference of an original document, and therefore no dust is carried or raised thereabouts. The reading device further includes a controller which controls the reading unit to suitably select reading a white density from between the first reference white plate and the second reference white plate in accordance with a shading correction situation so as to improve an image output quality.