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. 04, 1995
Filed:
Nov. 26, 1993
Kouji Nishio, Tokyo, JP;
Akio Morimoto, Tokyo, JP;
Kabushiki Kaisha Topcon, Tokyo, JP;
Abstract
An ophthalmologic apparatus includes an optical system for illuminating a subject's eye, an optical system for observing the eye illuminated by the illumination optical system, an alignment detecting system for detecting the alignment of the observation optical system with the eye, and a switchover circuit for switching over a reference allowable range to another range. The observation optical system can observe the eye at at least two different magnifications. The alignment detecting system includes a sensor for receiving reflection light reflected by the eye, a circuit for setting a reference allowable range, an arithmetic circuit for processing a signal output by the sensor and detecting an alignment condition, and a judgment circuit for judging whether the alignment condition detected by the arithmetic circuit is within the reference allowable range set by the range setting circuit.