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:
May. 22, 2001
Filed:
Jan. 05, 2000
Nobuaki Kitajima, Tokyo, JP;
Kabushiki Kaisha Topcon, Tokyo, JP;
Abstract
In an operation microscope, target light flux that is parallel light flux is projected at eyes of an operator, light reflected thereon is used to obtain an image of the pupil of the eye, and the position of a Purkinje image is detected to calculate the direction of the visual line of the operator's eyes. Observation magnification of an observation optical system is also calculated from the output of a potentiometer. The resultant direction of the visual line and observation magnification are used to calculate the position of the visual line of the operator. A liquid crystal display is arranged behind a half mirror when viewed from eyepiece side of a branch observation optical system, and displays as a spot image the position information indicating the calculated position of the visual line of the operator's eye.