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. 07, 1987
Filed:
Apr. 10, 1986
Applicant:
Inventors:
Yasuyuki Ishikawa, Kawaguchi, JP;
Isao Matsumura, Yokosuka, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A61B / ; A61B / ;
U.S. Cl.
CPC ...
351208 ; 351211 ; 354 62 ;
Abstract
An ophthalmic instrument for effecting eye measurement with an eye-measuring target mark projected onto an eye to be examined, includes a photodetector provided at a position optically conjugate with the position of the corneal reflection image of the eye-measuring target mark to thereby determine the quality of the accuracy of alignment with the eye to be examined.