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:
Oct. 29, 1991
Filed:
May. 14, 1985
Friedrich Weinhold, Norderstedt, DE;
B. A. T. Cigaretten-Fabriken GmbH, Hamburg, DE;
Abstract
A device for the production of at least two adjacent perforation rows in cigarettes and/or filter-lining paper or filter-wrapping paper comprises a pulsed laser light source with mirrors as well as an optical element which serves for both beam splitting and focusing of the produced partial beams. This optical element with two foci is preferably ground out of a collecting-lens blank or is formed from two parts of a collecting lens, which are combined to form the optical element. In one embodiment this optical element consists of the two equal havles of a collecting lens cut perpendicularly to the center plane thereof, which halves were displaced relative to each other and then combined again. As an alternative thereto, a central area of the output collecting lens running in the direction of the center plane can be cut out and the remaining peripheral portions can be combined, by means of which an optical element with two foci also results. A cigarette paper is moved in a plane of both foci such that the pulsed beam portion at each focus forms a row of perforations in the paper.