Laser marker with mask scanning
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United States of America Patent
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Oct 2, 1990
Grant Date -
N/A
app pub date -
Feb 16, 1989
filing date -
Feb 16, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A laser beam is used to mark a longitudinally moving web of paper both at intervals along its length and at plural locations across its width so that each of the sheets finally cut from the web bears a mark. The web passes over a cylinder having windows bearing masks carrying a logo or the like to be marked on the web. Mirrors are arranged on a drum assembly coaxially located in the cylinder to rotate therewith. The mirrors are disposed in helical sets extending along the axis of the drum to successively intercept a laser beam directed parallel to the axis of the drum and to reflect the beam to successive mask windows. The mirrors are plane mirrors set at 45.degree. to the axis and cause the beam to scan the mask in the circumference direction. The beam is collimated but not focussed and has a diameter that encompasses the transverse width of the mask. A ring mode laser beam is preferred.
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