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:
Mar. 14, 1989
Filed:
Apr. 02, 1987
Applicant:
Inventor:
Yasuyuki Ishikawa, Yokohama, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A61B / ;
U.S. Cl.
CPC ...
351208 ; 351206 ; 354 62 ;
Abstract
An ophthalmic apparatus has an objective optical system opposed to an eye to be examined. First and second photodetectors are provided on the substantially conjugate plane of the iris of the eye to be examined with respect to the objective optical system when the operating distance to the eye to be examined is appropriate. The photodetectors detect the image of the iris of the eye to be examined and the image of the pupil of the eye to be examined, respectively, and a detecting device compares the output of the first and second photodectors and detects the state of alignment with the eye to be examined.