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:
May. 07, 2002
Filed:
Sep. 08, 2000
Shoichi Yamazaki, Yokohama, JP;
Kazutaka Inoguchi, Kawasaki, JP;
Mixed Realty Systems Laboratory Inc., Yokohama, JP;
Abstract
An image display apparatus has a display device for displaying image information and an optical system for guiding light from the display device to the eye. The optical system has a prism body of a positive refractive power including three or more surfaces with refractive powers differing depending upon azimuthal angles. The surface of the prism body closest to the display device is a surface in which refractive powers thereof differ depending upon azimuthal angles and in which a local curvature radius area having a positive refractive power on a local generating-line section (meridional section) is interposed between local curvature radius areas having a negative refractive power on the local generating-line section (meridional section).