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:
Nov. 25, 2003
Filed:
Mar. 28, 2001
Hiroyuki Nakanishi, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A composite display apparatus keeps both optical density of display images formed by a display means and shutter speed of cameras such as a CCD in an optimum state relative to the external world light (see-through light), even in environments where the quantity of see-through light varies widely. The composite display apparatus includes a display optical system for guiding a light beam from a display means to the eyeballs of an observer; an image-pickup optical system for allowing an external light beam to form an image on an image-pickup means; and an optical path separating means provided in an optical path for allowing an ocular optical axis of the light beam of the display optical system entering the eyeballs of the observer, or an imaginary ocular optical axis which is an extension of the ocular optical axis, and an external world optical axis of the light beam entering the image-pickup optical system to substantially coincide.