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. 19, 1991
Filed:
Jul. 10, 1990
Applicant:
Inventor:
Isao Matsumura, Yokosuka, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A61B / ;
U.S. Cl.
CPC ...
351226 ; 351211 ; 351224 ;
Abstract
A perimeter has a predetermined index to be projected onto a fundus of an eye to be examined and an index projection imaging optical system which can form an intermediate image of the index in front of the eye. An optical system as being at least a part of the index-projection imaging optical system, is movable to displace the position of the index image on the fundus of the eye. The index-projection imaging optical system has an image forming section which moves the intermediate image in the direction of the optical axis.