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:
Feb. 14, 1984
Filed:
Mar. 03, 1981
Applicant:
Inventor:
Masao Nohda, Yokohama, JP;
Assignee:
Nippon Kogaku K.K., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A61B / ;
U.S. Cl.
CPC ...
351211 ;
Abstract
Improvements in an eye examining apparatus of the type having eye fixation mark means, eye refractive power measuring means and control means for moving an image of the fixation mark depending upon the output signal from said measuring means are disclosed. Said control means comprises means for detecting the position of the fixation mark image and means for detecting the difference between the level of signal from said position detecting means and the level of output from said measuring means. When the detected difference is within a predetermined range of values, the image of fixation mark is moved by a predetermined distance.