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:
Aug. 30, 2005
Filed:
Apr. 15, 2003
Serge J. A. Bierhuizen, Santa Rosa, CA (US);
Serge J. A. Bierhuizen, Santa Rosa, CA (US);
InFocus Corporation, Wilsonville, OR (US);
Abstract
The invention includes a color projection system comprising having a light source optically coupled to a light management device. The light management device being optically coupled to a polarizer. The color projection system also includes a projection lens optically coupled to the polarizer. Additionally, a plate is disposed between the polarizer and the projection lens. The plate has quarter-wave properties. The light management device has a number of polarizing beamsplitter (PBS) cubes, with one or more subsets of which are optically coupled to each other, and at least one light blocking region disposed between a first and a second PBS cube of the number of PBS cubes. As result reduction of stray light in a reflective projection system is facilitated.