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:
Jan. 13, 2009
Filed:
Dec. 27, 2006
Piermario Repetto, Orbassano, IT;
Stefano Bernard, Orbassano, IT;
Davide Capello, Orbassano, IT;
Roberto Finizio, Orbassano, IT;
Luca Liotti, Orbassano, IT;
Cosimo Carvignese, Orbassano, IT;
Denis Bollea, Orbassano, IT;
Piermario Repetto, Orbassano, IT;
Stefano Bernard, Orbassano, IT;
Davide Capello, Orbassano, IT;
Roberto Finizio, Orbassano, IT;
Luca Liotti, Orbassano, IT;
Cosimo Carvignese, Orbassano, IT;
Denis Bollea, Orbassano, IT;
C.R.F. Societa Consortile per Azioni, Orbassano (Turin), IT;
Abstract
An optical system for image projection, particularly for projection devices of the 'head-mounted'type, includes a display, an optical system for focusing an image formed by the display, and a light guide having an extended body, with two opposite, longitudinal, plane and parallel faces, and opposite ends which define first reflecting surface for coupling into the light guide and second reflecting surface for extracting the image from the light guide. Each light ray which propagates through the light guide undergoes at least three internal total reflections on the parallel plane faces of the light guide. At least a surface of the focusing optical system is a portion of a surface free of rotational symmetry axes. Moreover, the two reflecting surfaces of the light guide are portions of surfaces free of rotational symmetry axes. Finally, the inlet pupil of the light guide coincides with the outlet pupil of the focusing system.