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. 24, 2015
Filed:
Oct. 07, 2009
Guenther Benedix, Jena, DE;
Gudrun Schroeter, Jena, DE;
Gertrud Blei, Jena, DE;
Rainer Fischer, Jena, DE;
Eberhard Piehler, Jena-Nerkewitz, DE;
Guenther Benedix, Jena, DE;
Gudrun Schroeter, Jena, DE;
Gertrud Blei, Jena, DE;
Rainer Fischer, Jena, DE;
Eberhard Piehler, Jena-Nerkewitz, DE;
Sypro Optics GmbH, , DE;
Abstract
A projector for projecting light onto a projection surface includes a first group () with a negative meniscus, a second group () with positive refractive power, a third group () with a single lens, a fourth group () with a lens with positive refractive power, and a field lens () with positive refractive power, such that the light passes through the projection objective from the fourth to the first group. In order to be provide a high image quality with a small number of optical components and the smallest dimensions, the projector is configured so the common focal width of the fourth group () and the field lens () is smaller than twice the image circle diameter () of the projection objective and the maximum free diameter () is smaller than the overall focal width, and in particular smaller than 0.8 times the overall focal width of the projection objective.