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:
Oct. 21, 1997
Filed:
Jun. 21, 1995
Takashi Masuda, Yamato, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A position detecting apparatus for an ophthalmologic apparatus has an image pickup element, a light source, a first projection system for projecting a light beam from the light source onto the cornea of an eye to be examined, a second projection system for projecting one corneal reflection image of the light source onto a plurality of positions on the image pickup element, and a calculator for calculating the central positions of and the distance between the corneal reflection images projected onto the plurality of positions on the image pickup element. The positional deviation of the ophthalmologic apparatus relative to the eye to be examined from an aligned state is quantitatively detected by the calculation by the calculator.