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. 02, 1985
Filed:
Mar. 29, 1982
Masao Nohda, Yokosuka, JP;
Nippon Kogaku K.K., Tokyo, JP;
Abstract
An apparatus in which an optical system to be examined is periodically scanned by a slit-like illuminating light beam and the light beam from the optical system is received by two pairs of photoelectric converters and the refractive power of the optical system is measured on the basis of the phase difference between the output signals of the photoelectric converters forming each of said pairs includes projection means capable of alternatively scanning the illuminating light beam from two known directions, output means adapted to put out a discrimination signal of the scanning direction of the illuminating light beam, and operational means for receiving the discrimination signal and the phase difference as inputs and obtaining a refractive power.