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. 13, 1999
Filed:
Jan. 16, 1998
Brian L Heffner, Los Altos, CA (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
An optical system for reflecting light from a display screen into an aperture which is typically the pupil of a person wearing a head-mounted display system in which the display screen is mounted to the side of the viewer's eye. The optical system includes a turning optical assembly having a plurality of planar facets disposed on a curved surface opposite to the aperture, the planes of the facets being parallel to one another. Light from the display entering an input port impinges on the facets such that the light is reflected by the facets into the aperture. The curved surface has a curvature chosen such that the fill factor for each of the facets is substantially the same as that for the others of the facets. In one embodiment of the present invention, the curved surface is a cylinder having a hyperbolic cross-section.