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:
Feb. 24, 2009
Filed:
Nov. 30, 2005
Bart Maximus, Oudenaarde, BE;
Rik Defever, Kuurne, BE;
Bart Maximus, Oudenaarde, BE;
Rik Defever, Kuurne, BE;
Barco, N.V., Kortrijk, BE;
Abstract
A polariser or a system for lighting using such a polariser in a polarisation recuperation system. The polariser comprises first and second polarising beam splitters () for splitting first and second unpolarised beams each into at least first and second polarised beams of different polarisation states. The first and second polarised beams are guided to first and second light paths respectively. On these light paths controllable polarisation conversion elements () are arranged such that the second polarised beam from the first unpolarised beam time-shares a same path through the polarisation conversion element () as the first polarised beam from the second unpolarised beam. The controllable polarisation conversion elements are switchable to alternately convert and not convert the polarisation state, depending on which beam is switched to pass through the polarisation conversion elements (), corresponding with which of the first or second unpolarised beams are present.