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. 13, 1984
Filed:
Jun. 25, 1980
Applicant:
Inventor:
Eiichi Sano, Tokyo, JP;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A61B / ; G03B / ;
U.S. Cl.
CPC ...
351208 ; 354 62 ;
Abstract
An ophthalmic instrument such as an eye fundus camera including an illuminating system which projects an illuminating light through a ring-shaped aperture to a patient's eye. There is provided a working distance detecting device which includes a light receiving section provided around the objective lens. A portion of the illuminating light as reflected at the cornea of the patient's eye is received by the light receiving section to determine a correct working distance.