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:
Jan. 18, 2005
Filed:
Jul. 22, 2002
Wolfgang Deckenbach, Schechen, DE;
Thomas Attenberger, Poing, DE;
Wolfgang Deckenbach, Schechen, DE;
Thomas Attenberger, Poing, DE;
Giesecke & Devrient GmbH, Munich, DE;
Abstract
A laser illuminating apparatus that illuminates a linear or strip-shaped area (S) of sheet material (B) with high radiant power contains a diode laser () whose output is followed by two mutually orthogonally oriented rod lenses () whose focal length is small in comparison to their distance. Between the two rod lenses () a laser light beam fan (L) is formed. Said fan is focused by the second rod lens () on a narrow linear area (S). Behind said area the laser beams diverge at a large angle (α) so that the power density decreases accordingly rapidly. If the light falls on the retina of an observer's eye, the laser light is not focused pointwise but only linearly, which excludes injury to the eye due to the accordingly low power density.