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:
Sep. 13, 2016
Filed:
Dec. 14, 2011
Applicants:
Ulrich Backes, Radolfzell, DE;
Harald Kohnlein, Gottmadingen, DE;
Inventors:
Ulrich Backes, Radolfzell, DE;
Harald Kohnlein, Gottmadingen, DE;
Assignee:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B 21/20 (2006.01); B60Q 3/04 (2006.01); G03B 21/08 (2006.01); G03B 21/00 (2006.01);
U.S. Cl.
CPC ...
G03B 21/2013 (2013.01); B60Q 3/044 (2013.01); G03B 21/001 (2013.01); G03B 21/08 (2013.01); G03B 21/20 (2013.01);
Abstract
A simple optical projection device with a high luminous efficacy has a point light source, a projection screen, a mask that is arranged in the light path upstream of the projection screen and is light-transmissive in some areas, and a light focusing optical lens arranged between the point light source and the mask. The optical lens is selected such that the prolongations of the emerging beams of the optical lens on the side thereof facing the point light source intersect in a virtual perspective center which is more remote from the lens than the point light source.