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:
Jul. 03, 2001
Filed:
Jul. 20, 1999
Brahim Dahmani, Montrouge, FR;
Yuri Korzinin, St. Petersbourg, RU;
Vitaly I. Sukhanov, St. Petersbourg, RU;
Corning Precision Lens, Cincinnati, OH (US);
Abstract
Device for elimination of the zero order beam emerging from holograms illuminated in polarized light includes a birefringent plate (,) illuminated by both said zero order beam (,) and by a diffracted beam (,) emerging from the hologram (,). The plate is arranged and sized such that one of the beams (,) emerges from the plate with its plane of polarization not appreciably rotated and such that the other of said beams emerges with its plane of polarization rotated by 90°. The device further includes a polarizer (,) illuminated by the beams (,′) emergent from the birefringent plate (,), the polarizer having its plane of maximum transmittance parallel to the plane of polarization of the diffracted beam emerging from the birefringent plate as beam (,′). The device finds industrial applicability in the optical systems of video image projectors employing active matrix liquid crystal cells.