Magnetic rotary encoder

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 4418372
SERIAL NO

06173842

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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.TOKYO13764

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hayashida, Hiroshi Mito, JP 12 248
Kawakami, Kanji Katsuta, JP 34 772
Miyashita, Kunio Hitachi, JP 71 1514
Takahashi, Tadashi Hitachi, JP 179 2774

Cited Art Landscape

Patent Info (Count) # Cites Year
 
U.S. PHILIPS CORPORATION (1)
* 4320428 Multitrack thin-film magnetic head with stacked electric leads 5 1980
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
ROSEMOUNT INC. (1)
* 5502380 Analog weighted binary absolute position encoder including an array of sense resistors each having material responsive to FWX and nonresponsive to flux 8 1994
 
SANKYO SEIKI MFG. CO., LTD. (1)
* 2006/0077,032 Magnetoresistive element 2 2005
 
HEWLETT-PACKARD COMPANY (1)
* 5027243 Self-initialization of short magnetoresistive sensors into a single domain state 22 1989
 
ALPS ELECTRIC CO., LTD. (1)
* 5117319 Magnetic movement sensing device 6 1989
 
HITACHI GLOBAL STORAGE TECHNOLOGIES NETHERLANDS B.V. (1)
* 4649447 Combed MR sensor 24 1985
 
ADMOTEC, INC (1)
* 4853631 Magnetoresistive sensor having inter-leaved magnetoresistive elements for detecting encoded magnetic information 14 1987
 
MITSUBISHI KASEI CORPORATION (1)
* 4843365 Magnetoresistance element 1 1988
 
HITACHI, LTD. (5)
* 4628259 Magneto resistive sensor for detecting movement of a rotating body 16 1981
* 4639807 Magnetic detector having magnetoresistive elements 23 1983
* 4766376 Magnetic position detector for detecting an absolute position of a movable member 17 1986
* 5218279 Method and apparatus for detection of physical quantities, servomotor system utilizing the method and apparatus and power steering apparatus using the servomotor system 22 1991
* RE34355 Magneto resistive sensor for detecting movement of a rotating body 3 1991
 
NorthStar Technologies Inc. (2)
6246233 Magnetoresistive sensor with reduced output signal jitter and temperature compensation 21 1997
6300758 Magnetoresistive sensor with reduced output signal jitter 21 1999
 
COMMISSARIAT A L'ENERGIE ATOMIQUE (1)
* 5821517 Magnetic encoder for reading marks on an associated magnetic track 8 1995
 
YAMAHA CORPORATION (1)
* 4954803 Magnetic-resistor sensor and a magnetic encoder using such a sensor 4 1989
 
LAKE SHORE CRYOTRONICS, INC. (6)
* 5293125 Self-aligning tachometer with interchangeable elements for different resolution outputs 27 1992
* 5336994 Magneto-resistive tachometer assembly with reversible cover and related method 1 1992
* 5495758 Tachometer assembly with integral internal wrench 8 1993
* 5514955 Slim profile digital tachometer including planar block and rotor having spokes and clamp 0 1994
* 5654633 Magneto-resistive tachometer sensor module with different resolution outputs for the same magnetic drum 8 1995
* 5900727 Magneto-resistive tachometer kit including two sensor modules providing different resolution quadrature outputs from the same rotor 6 1997
 
KABUSHIKI KAISHA SANKYO SEIKI SEISAKUSHO (1)
* 5047716 Movement detector employing constant current drive 15 1989
 
VICTOR COMPANY OF JAPAN, LTD. (1)
* 4656377 Tachogenerator having a magnetoresistance stator coil 14 1985
 
The Torrington Company (1)
6700367 Bearing equipped with magnetic encoder and sensor including aligned sensing elements 17 2000
 
PRINCETON ELECTRO-TECHNOLOGY, INC. (1)
* 5545985 Magnetoresistive position sensor including an encoder wherein the magnetization extends greater than 0.5 times the pole pitch below the surface 15 1994
 
NTN CORPORATION (1)
* 4904937 Apparatus for magnetically detecting positions with minimum length magnetic information units recorded on a plurality of magnetic tracks 12 1988
 
MITUTOYO CORPORATION (1)
* 5949051 Magnetic encoder using a displacement detecting circuit thereof 11 1997
* Cited By Examiner