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. 29, 2012
Filed:
Apr. 21, 2006
Gerhard Kuhn, Kofering, DE;
Moritz Engl, Regensburg, DE;
Patrick Kromotis, Regensburg, DE;
Stefan Grötsch, Bad Abbach, DE;
Josef Hüttner, Regensburg, DE;
Mario Wanninger, Regensburg, DE;
Georg Bogner, Lappersdorf, DE;
Gerhard Kuhn, Kofering, DE;
Moritz Engl, Regensburg, DE;
Patrick Kromotis, Regensburg, DE;
Stefan Grötsch, Bad Abbach, DE;
Josef Hüttner, Regensburg, DE;
Mario Wanninger, Regensburg, DE;
Georg Bogner, Lappersdorf, DE;
Osram Opto Semiconductors GmbH, Regensburg, DE;
Abstract
A projection apparatus is specified, comprising a light modulator having a light receiving region with a cross-sectional area to be illuminated of the size Aand a maximum acceptance angle α for incident light, and at least one light source by means of which, during its operation, a light cone is produced for illuminating said cross-sectional area of said light receiving region and which comprises a number N of LED chips having a maximum radiation angle β. At least one of the LED chips has a radiation decoupling area of the size A. The relation 0.7·(A·sin(α))/(A·sin(β)·n)≦N≦1.3·(A·sin(α))/(A·sin(β)·n) applies, where n is equal to 1 or to the refractive index of a coupling medium with which the LED chips are provided.