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. 25, 1978
Filed:
Nov. 24, 1976
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
The present invention relates to an eye fundus camera free from undesired reflected and diffused light beams. The camera uses a photographic optical system including an objective lens, a reflecting means, an aperture means, a photographic lens system for imaging the eye fundus to be inspected in sequence on a photographic plane and an illumination optical system including at least a light source, a relay lens and a ring-shaped aperture. The optical system leads the light beam from the light source to the eye to be inspected through the reflecting means and the objective lens, whereby the ring-shaped aperture is positioned in the illumination optical system in such a manner that the image of the ring-shaped aperture is formed near the iris in the eye to be inspected while the aperture is positioned in such a manner that the conjugate position of the aperture with reference to the objective lens is near the cornea to the eye to be inspected. The undesired reflected and diffused light beam out of the illumination light beam taking place in the eye to be inspected is thereby eliminated.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile