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:
Jan. 22, 1991
Filed:
Jul. 07, 1989
Applicant:
Inventors:
Kenzaburou Iijima, Shizuoka, JP;
Yoshinori Hayashi, Shizuoka, JP;
Assignee:
Yamaha Corporation, , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03M / ;
U.S. Cl.
CPC ...
341 15 ; 364561 ;
Abstract
In construction of a signal processing circuit for an encoder including a pair of phased magnetic sensors arranged, for relative displacement, facing a magnetized track on a scale, output signals issued by the magnetic sensors are first stage divided by an analog processing unit and, after conversion into digital signals, second stage conversion is carried out by a digital phase locked loop connected to the analog processing unit. The degree of dissolution in detection of the displacement by the entire circuit is remarkably enhanced by the dual stage division of the signals during processing.