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:
Oct. 13, 1998
Filed:
Jan. 27, 1997
Franciscus J Wortel, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
An optical device for combining three sub-beams of different colors to one color beam is disclosed having a first and a second color-selective reflector arranged on transparent plate-shaped substrates, the first reflector reflecting a first of said sub-beams, the second reflector reflecting the first sub-beam and a second of said sub-beams and a third of said sub-beams passing through the second reflector and its substrate. A transparent plate is arranged in the path of the first sub-beam and in front of the first reflector, the transparent plate having a product of refractive index and thickness equal to that of the substrates of the first and second reflectors. An astigmatism correcting element is positioned in the path of the color beam.