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. 31, 1989
Filed:
Apr. 24, 1987
Applicant:
Inventor:
Sadao Kawata, Koide, JP;
Assignee:
Alps Electric Co., Ltd., , JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01B / ;
U.S. Cl.
CPC ...
324208 ; 338 / ; 324252 ; 324262 ;
Abstract
A rotation information detector comprising plural magnetoresistant elements arranged parallel and adjacent to a rotating magnetic field and dummy elements located parallel on both sides of the magnetoresistant elements wherein rotation information is detected on the basis of those electric resistances on the magnetoresistant elements which change responsive to the change of the magnetic field, characterized in that boundary patterns are formed between the magnetoresistant elements and the dummy ones, respectively, so that the magnetoresistant elements can be distinctly distinguished from the dummy ones to enhance the efficiency of appearance check.