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:
Dec. 01, 1992
Filed:
Oct. 15, 1991
Seiichi Wakamatsu, Tokyo, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
A position detector device for detecting the position of a moving object includes a magnetically-recorded section on a moving surface of the moving object where multipoles are magnetized with a wave-length of .lambda., and a magnetic sensor for detecting changes in magnetic field by moving of the magnetically-recorded section. The magnetic sensor is provided with 2.sup.N (N+1, 2, 3, . . . ) pieces of signal detecting magnetic resistance elements connected to constant-current power sources and arranged at an interval of .lambda./2.sup.(N+2). The extent to which the moving object is moved is detected on the basis of electric signals outputted from these signal detecting magnetic resistance elements.