Raster input scanner
AssigneeXerox Corporation
InventorsJames C. Stoffel, Ned J. Seachman, Jack R. Hauber, William Kingsley
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Abstract
A high speed parallel process raster input scanner employing time delay in integration (TDI) arrays for scanning plural lines of an original document. The lines of image signals output by the arrays are processed simultaneously, such processing including a two dimensional digital processor for processing text and pictorial image signals which are then input to a detector for selecting one or the other of the text and pictorial image signals for output from the scanner.
Claims8
A high speed raster input scanner comprising a transparent platen for supporting documents to be scanned;
- lamp means for providing a wedge-shaped beam of light to illuminate at least N lines of the document thereon;
- a movable mirror for sweeping said beam across said platen;
- at least one scanning array;
- said array comprising a two dimensional array for reading N image lines;
- optical means interposed between said platen and said array for focusing N image lines of said document on said array;
- and drive means to move said document in synchronism with scanning operation of said array to scan said document lines N times whereby to enhance the operational speed of said scanner, and where said document is supported on said platen, said drive means moving said lens means and said mirror in synchronism with scanning operation of said array to scan said document lines N times whereby to enhance the operational speed of said scanner.
A high speed parallel process raster input scanner comprising, in combination:
- (a) a transparent platen for supporting documents to be scanned;
- (b) means for generating a wedge-like beam of light;
- (c) a mirror interposed in the path of said beam for reflecting said beam onto said platen, said mirror being movable to sweep said beam of light across said platen in a Y scan direction to progressively illuminate the document thereon;
- (d) at least one array for scanning said document;
- (e) movable lens means interposed between said platen and said array for simultaneously focusing plural lines of said document on said array;
- (f) said array being composed of plural rows of image reading elements, said rows of image reading elements being substantially parallel to one another and extending in the X scan direction to read plural lines of said document at once;
- (g) drive means for moving said lens means and said mirror in synchronization with one another, said drive means moving said lens means at a fraction of the rate of movement of said mirror;
- and
- (h) control means for synchronizing operation of said drive means with scanning operation of said array.
Dependencies are inferred from the claim text.