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:
May. 31, 2005
Filed:
Mar. 13, 2002
Ruediger Kittelmann, Einbeck, DE;
Harry Wagener, Alfeld, DE;
Ruediger Kittelmann, Einbeck, DE;
Harry Wagener, Alfeld, DE;
Schott Glas, Mainz, DE;
Abstract
The optical system for the Fresnel lens light has an ellipsoidal reflector (), a light source () and a Fresnel lens (). The distance (a) between the Fresnel lens () and the reflector () is changeable but is related to the changeable distance (b) between the light source () and the reflector () so that the aperture angle of the propagated light beam is variable but illumination intensity of the propagated light is maintained uniform. Surfaces of the at least one Fresnel lens and/or the reflector can be structured to provide more uniform illumination of a given area. The optical system is useful for lights for film, stage, studio and photography.