US Patent No: 4,418,372

Number of patents in Portfolio can not be more than 2000

Magnetic rotary encoder

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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Disclosed is a magnetic rotary encoder used in combination with a rotary body having plural pieces of magnetic information recorded on at least one circumferentially running track. The rotary encoder comprises a substrate having a surface disposed opposite to the rotary body and at least one magnetoresistive element formed on the surface of the substrate. The magnetoresistive element is formed on the substrate surface as an integral pattern including at least two portions extending substantially in the radial direction of the rotary body in a relation opposite to the magnetic information recorded portion of the rotary body, two lead connection terminal portions formed at the outer ends of the radially extending portions respectively, and a circumferentially extending portion interconnecting the radially extending portions at their ends, so as to form a single electrical signal path which passes both of the radially extending portions and terminates in the two lead connection terminal portions. These lead connection terminal portions are disposed outside of the outer peripheral edge of the rotary body.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
HITACHI, LTD.TOKYO31524

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hayashida, Hiroshi Kure, JP 12 235
Kawakami, Kanji Mito, JP 34 742
Miyashita, Kunio Azumino, JP 82 1328
Takahashi, Tadashi Kawasaki, JP 200 2279

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Compagnie Internationale pour l'Informatique CII-Honeywell Bull (Societe Anonyme) (2)
4,212,041 Apparatus and method for removing the effect of interference magnetic fields in a magnetic transducer device for detecting information magnetically coded on a carrier 8 1978
4,315,291 Magnetic transduction device with magnetoresistances 29 1979
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (1)
4,255,708 Magnetoresistive position transducer with invariable peak signal 8 1978
 
U.S. PHILIPS CORPORATION (1)
4,320,428 Multitrack thin-film magnetic head with stacked electric leads 5 1980

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
LAKE SHORE CRYOTRONICS, INC. (6)
5,293,125 Self-aligning tachometer with interchangeable elements for different resolution outputs 27 1992
5,336,994 Magneto-resistive tachometer assembly with reversible cover and related method 1 1992
5,495,758 Tachometer assembly with integral internal wrench 8 1993
5,514,955 Slim profile digital tachometer including planar block and rotor having spokes and clamp 0 1994
5,654,633 Magneto-resistive tachometer sensor module with different resolution outputs for the same magnetic drum 6 1995
5,900,727 Magneto-resistive tachometer kit including two sensor modules providing different resolution quadrature outputs from the same rotor 5 1997
 
HITACHI, LTD. (5)
4,628,259 Magneto resistive sensor for detecting movement of a rotating body 16 1981
4,639,807 Magnetic detector having magnetoresistive elements 23 1983
4,766,376 Magnetic position detector for detecting an absolute position of a movable member 17 1986
5,218,279 Method and apparatus for detection of physical quantities, servomotor system utilizing the method and apparatus and power steering apparatus using the servomotor system 19 1991
RE34355 Magneto resistive sensor for detecting movement of a rotating body 3 1991
 
NorthStar Technologies Inc. (2)
6,246,233 Magnetoresistive sensor with reduced output signal jitter and temperature compensation 19 1997
6,300,758 Magnetoresistive sensor with reduced output signal jitter 20 1999
 
ADMOTEC, INC (1)
4,853,631 Magnetoresistive sensor having inter-leaved magnetoresistive elements for detecting encoded magnetic information 13 1987
 
ALPS ELECTRIC CO., LTD. (1)
5,117,319 Magnetic movement sensing device 6 1989
 
COMMISSARIAT A L'ENERGIE ATOMIQUE (1)
5,821,517 Magnetic encoder for reading marks on an associated magnetic track 7 1995
 
HEWLETT-PACKARD COMPANY (1)
5,027,243 Self-initialization of short magnetoresistive sensors into a single domain state 21 1989
 
HITACHI GLOBAL STORAGE TECHNOLOGIES NETHERLANDS B.V. (1)
4,649,447 Combed MR sensor 24 1985
 
KABUSHIKI KAISHA SANKYO SEIKI SEISAKUSHO (1)
5,047,716 Movement detector employing constant current drive 15 1989
 
MITSUBISHI KASEI CORPORATION (1)
4,843,365 Magnetoresistance element 1 1988
 
MITUTOYO CORPORATION (1)
5,949,051 Magnetic encoder using a displacement detecting circuit thereof 10 1997
 
NTN CORPORATION (1)
4,904,937 Apparatus for magnetically detecting positions with minimum length magnetic information units recorded on a plurality of magnetic tracks 10 1988
 
PRINCETON ELECTRO-TECHNOLOGY, INC. (1)
5,545,985 Magnetoresistive position sensor including an encoder wherein the magnetization extends greater than 0.5 times the pole pitch below the surface 14 1994
 
ROSEMOUNT INC. (1)
5,502,380 Analog weighted binary absolute position encoder including an array of sense resistors each having material responsive to FWX and nonresponsive to flux 8 1994
 
The Torrington Company (1)
6,700,367 Bearing equipped with magnetic encoder and sensor including aligned sensing elements 12 2000
 
VICTOR COMPANY OF JAPAN, LTD. (1)
4,656,377 Tachogenerator having a magnetoresistance stator coil 14 1985
 
YAMAHA CORPORATION (1)
4,954,803 Magnetic-resistor sensor and a magnetic encoder using such a sensor 4 1989