Motor-speed control apparatus for scanners with a movable scan h

Details Motor-speed control apparatus for scanners with a movable scan h Motor-speed control apparatus for scanners with a movable scan h

1998-04-17

2000-09-05

Lee, Cheukfan

Facsimile and static presentation processing

Natural color facsimile

Scanning

358497, 358474, 358444, 358412, 318696, 318685, H04N 146

Patent

active

061151491

ABSTRACT:
A motor-speed control apparatus is provided for use on a scanner of the type having a movable scan head, such as a flatbed scanner, for the purpose of controlling the operation a stepper motor used to drive the CCD (charge coupled device) scan head of the scanner. In this motor-speed control apparatus, a Y data table is predetermined, which includes a number of Y data sets, each corresponding to one line in the lengthwise direction (i.e., the Y-axis direction) of the document being scanned. In operation of the scanner when the scan head is to be moved over the document, the manipulation on each pixel in the lengthwise direction is based on the predetermined values of the corresponding Y data set. This allows the scan head to move in a non-target area of the document (the area that is not to be scanned), and at a fixed speed when moving over the target area of the document (the area that is to be scanned). Further, the scan head is moved in a rapid mode back to the original standby position immediately after the scan over the target area of the document is completed. This allows the scanner to be operated more efficiently.

REFERENCES:
patent: 5491397 (1996-02-01), Hirakawa

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