Measurement of paper speed using laser speckle detection
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United States of America Patent
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Apr 24, 2001
Grant Date -
N/A
app pub date -
Feb 13, 1998
filing date -
Feb 13, 1998
priority date (Note) -
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Abstract
In a postage printing device, a printer is employed to print postage indicia on mail pieces. The printer is preferably a noncontact printer such as an ink-jet printer. Printing occurs as the mail piece moves relative to the print head of the printer, which requires that reliable motion information (e.g. a print clock signal) be made available to the electronics driving the print head. The reliable motion is provided in a noncontact way, preferably by directing a laser beam toward the mail piece and detecting a moving speckle pattern in the light scattered from the mail piece.
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