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:
Dec. 29, 1998
Filed:
Dec. 19, 1996
Seiichi Tanaka, Chiba, JP;
Atsushi Yamanaka, Chiba, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A small and light liquid-crystal projector, a projector making a combination with a head-mounted display and a small-and-light projector device for projecting an image or three-dimensional image from the HMD onto a common screen: the HMD has, in its casing, an optical device for enlarging an image of a liquid-crystal panel illuminated by a back light, which device comprising a reflection type refracting element with a half-mirror coat and a cholesteric liquid crystal element acting as circularly-polarized-light selecting semitransparent mirror; a base unit with which the HMD is connected to form a projector device has, in its housing, an optical correcting portion, a projector back-light, a light-source changing portion and a mechanism for inserting the optical correcting portion for correcting the curvature of a projectable image; when assembling the HMD with the base unit, the light-source changing portion acts so as to illuminate the liquid crystal panel with intensive back-light though a parabolic mirror and, at the same time, the optical correcting portion is inserted into a optical path.