The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 27, 1984
Filed:
Jul. 24, 1981
A Clifton Lilly, Jr, Richmond, VA (US);
Warren E Claflin, Bon Air, VA (US);
Edward B Stultz, Richmond, VA (US);
Ulysses A Brooks, Glen Allen, VA (US);
Peter Martin, Richmond, VA (US);
Philip Morris Incorporated, New York, NY (US);
Abstract
In the perforation of sheet material by light energy, a continuous focused laser beam is reflected from different locations along the beam axis to provide separate pulsed beams and the beams are issued onto the sheet material with the same beam cross-sectional area. In one aspect, the lengths of respective different light paths for conveyance of light from the point of focus of the laser to final image locations are made equal. In another aspect, different focusing elements may be included in light paths to provide for sameness of beam cross-sectional area at the final image locations. The light paths are preferably provided in part by light conducting apparatus having light-reflective elements mounted for movement, such that different perforation matrices may be readily attained.