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:
Apr. 27, 2004
Filed:
Dec. 04, 2002
Yasufumi Fukuma, Tokyo, JP;
Hidetaka Aeba, Tokyo, JP;
Kabushiki Kaisha Topcon, Tokyo, JP;
Abstract
An observation apparatus capable of removing astigmatism is provided. The observation apparatus includes a variable power lens system ( ) located on an observation path of an observation optical system ( ) extending from an objective lens ( ) to an imaging lens ( ). A portion of the observation optical system which extends from the objective lens ( ) to the variable power lens system ( ) serves as an observation path through which reflected light fluxes from an eye fundus (Er) of an operating eye (E) are relayed to the variable power lens system ( ) as parallel light fluxes. A portion thereof which extends from the variable power lens system ( ) to the imaging lens ( ) serves as an observation path through which the reflected light fluxes obtained through the variable power lens system ( ) are relayed to an eyepiece ( ) as parallel light fluxes. An astigmatism canceling optical element ( ) for canceling astigmatism power caused when optical members ( ) are held against the operating eye (E) is provided in any location on the observation path of the observation optical system ( ) extending from the objective lens ( ) to the eyepiece ( ).