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. 12, 1982
Filed:
May. 23, 1980
Masao Nohda, Yokohama, JP;
Izumi Umemura, Kawasaki, JP;
Nippon Kogaku K.K., Tokyo, JP;
Abstract
An eye-refractometer device includes a light receiving member having a pair of photoelectric elements for detection of astigmatic axis and a pair of photoelectric elements for detection of diopter of an eye provided on the light receiving surface of said member off the optical axis of a condenser lens. Said pair of astigmatic axis detection photoelectric elements are positioned on a straight line normal to the scanning direction of the beam projected through said projection optical system. Said pair of diopter detection photoelectric elements are positioned on a line extending in said scanning direction. The eye-refractometer device has a highly improved accuracy of measurement of diopter.