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. 07, 1989
Filed:
Apr. 09, 1987
Hitachi Medical Corp., Tokyo, JP;
Abstract
A circuit for correcting a variation in phase of a train of clock pulses detected from a pattern of a coding disc of a rotary encoder which detects the rotation angle of a rotating shaft, comprises an ROM in which data for correction of a phase variation corresponding to the rotation angles of the coding disc are preliminarily stored. The correction data are read from the ROM by designating addresses of the ROM by means of the counter which counts up a train of clock pulses from the rotary encoder before the clock pulse train is subjected to correction. The clock pulses are phase-modulated by the correction data from the ROM to provide a corrected train of clock pulses which correctly represent the rotation angles of the rotating shaft.