WO2009031558A1 - Magnetic encoder - Google Patents

Magnetic encoder Download PDF

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Publication number
WO2009031558A1
WO2009031558A1 PCT/JP2008/065820 JP2008065820W WO2009031558A1 WO 2009031558 A1 WO2009031558 A1 WO 2009031558A1 JP 2008065820 W JP2008065820 W JP 2008065820W WO 2009031558 A1 WO2009031558 A1 WO 2009031558A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic encoder
gmr
magnet
divided
element portions
Prior art date
Application number
PCT/JP2008/065820
Other languages
French (fr)
Japanese (ja)
Inventor
Makito Takigawa
Original Assignee
Alps Electric Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alps Electric Co., Ltd. filed Critical Alps Electric Co., Ltd.
Publication of WO2009031558A1 publication Critical patent/WO2009031558A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
    • G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

High resolution detection precision is achieved without requiring complicated operation processing. The magnetic encoder has a GMR sensor (10) where magnets (M) magnetized with multiple poles and moving in a fixed direction and the element portions in GMR elements (R1-R4(R1'-R4')) divided into a plurality of pieces are arranged in the moving direction of the magnet (M) at predetermined interval smaller than the magnetization pitch of the magnet (M). The magnetic encoder also has an output variation detection circuit (20) for detecting an output voltage which varies stepwise depending on the number of divided element portions of the GMR elements (R1-R4(R1'-R4')) in the GMR sensor (10).
PCT/JP2008/065820 2007-09-06 2008-09-03 Magnetic encoder WO2009031558A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007230870 2007-09-06
JP2007-230870 2007-09-06

Publications (1)

Publication Number Publication Date
WO2009031558A1 true WO2009031558A1 (en) 2009-03-12

Family

ID=40428872

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2008/065820 WO2009031558A1 (en) 2007-09-06 2008-09-03 Magnetic encoder

Country Status (1)

Country Link
WO (1) WO2009031558A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010281767A (en) * 2009-06-08 2010-12-16 Alps Electric Co Ltd Sensor element and magnetic sensor
DE102021106535A1 (en) 2020-04-08 2021-10-14 Tdk Corporation Magnetic sensor, magnetic encoder and lens position detection component
DE102021108750A1 (en) 2020-04-20 2021-10-21 Tdk Corporation MAGNETIC SENSOR, MAGNETIC ENCODER AND LENS POSITION DETECTION COMPONENT
DE102022108576A1 (en) 2021-04-15 2022-10-20 Tdk Corporation MAGNETIC SENSOR, MAGNETIC ENCODER AND LENS POSITION DETECTION ELEMENT
DE102023104750A1 (en) 2022-03-01 2023-09-07 Tdk Corporation MAGNETIC SENSOR, MAGNETIC ENCODER, LENS POSITION DETECTION DEVICE, DISTANCE MEASUREMENT DEVICE AND MAGNETIC SENSOR MANUFACTURING METHOD
DE102023108121A1 (en) 2022-04-01 2023-10-05 Tdk Corporation MAGNETIC ENCODER AND DISTANCE METER
DE102023122041A1 (en) 2022-08-22 2024-02-22 Tdk Corporation MAGNETIC SENSOR, MAGNETIC ENCODER AND PRODUCTION METHOD FOR A MAGNETIC SENSOR

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0590965A (en) * 1991-09-27 1993-04-09 Kawasaki Steel Corp A/d converter
JPH1151697A (en) * 1997-08-06 1999-02-26 Toyota Motor Corp Rotational direction detector
JP2002206950A (en) * 2001-01-11 2002-07-26 Hitachi Metals Ltd Magnetic sensor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0590965A (en) * 1991-09-27 1993-04-09 Kawasaki Steel Corp A/d converter
JPH1151697A (en) * 1997-08-06 1999-02-26 Toyota Motor Corp Rotational direction detector
JP2002206950A (en) * 2001-01-11 2002-07-26 Hitachi Metals Ltd Magnetic sensor

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010281767A (en) * 2009-06-08 2010-12-16 Alps Electric Co Ltd Sensor element and magnetic sensor
DE102021106535A1 (en) 2020-04-08 2021-10-14 Tdk Corporation Magnetic sensor, magnetic encoder and lens position detection component
US11360286B2 (en) 2020-04-08 2022-06-14 Tdk Corporation Magnetic sensor, magnetic encoder, and lens position detection device
DE102021108750A1 (en) 2020-04-20 2021-10-21 Tdk Corporation MAGNETIC SENSOR, MAGNETIC ENCODER AND LENS POSITION DETECTION COMPONENT
US11585872B2 (en) 2020-04-20 2023-02-21 Tdk Corporation Magnetic sensor, magnetic encoder, and lens position detection device
DE102022108576A1 (en) 2021-04-15 2022-10-20 Tdk Corporation MAGNETIC SENSOR, MAGNETIC ENCODER AND LENS POSITION DETECTION ELEMENT
US11703358B2 (en) 2021-04-15 2023-07-18 Tdk Corporation Magnetic sensor, magnetic encoder, and lens position detection device
DE102023104750A1 (en) 2022-03-01 2023-09-07 Tdk Corporation MAGNETIC SENSOR, MAGNETIC ENCODER, LENS POSITION DETECTION DEVICE, DISTANCE MEASUREMENT DEVICE AND MAGNETIC SENSOR MANUFACTURING METHOD
DE102023108121A1 (en) 2022-04-01 2023-10-05 Tdk Corporation MAGNETIC ENCODER AND DISTANCE METER
DE102023122041A1 (en) 2022-08-22 2024-02-22 Tdk Corporation MAGNETIC SENSOR, MAGNETIC ENCODER AND PRODUCTION METHOD FOR A MAGNETIC SENSOR

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