JPS5771504A - Read out system for magnetoresistive element - Google Patents

Read out system for magnetoresistive element

Info

Publication number
JPS5771504A
JPS5771504A JP55147865A JP14786580A JPS5771504A JP S5771504 A JPS5771504 A JP S5771504A JP 55147865 A JP55147865 A JP 55147865A JP 14786580 A JP14786580 A JP 14786580A JP S5771504 A JPS5771504 A JP S5771504A
Authority
JP
Japan
Prior art keywords
signal
psd13
information
recorded
output
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP55147865A
Other languages
Japanese (ja)
Inventor
Katsuhiko Nakagawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP55147865A priority Critical patent/JPS5771504A/en
Publication of JPS5771504A publication Critical patent/JPS5771504A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
    • G11B5/39—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects

Abstract

PURPOSE:To make detection of high S/N possible by applying AC magnetic fields to magnetoresistive elements, modulating the magnetic recording information read out from the elements and performing synchronous detection by referring to the AC magnetic field signal at the time of demodulating this information. CONSTITUTION:An MR element 4 and an MR element 11 for reference in a head core gap are shunted of respectively the same resistance value R and are connected in series, thence voltge Vs is applied thereto. The element 11 has the same characteristics as those of the element 4 and is applied with a magnetic field by an oscillating source 12 synchronized with an oscillating source 5. The output at the connection point of the element 4 and the element 11 is put together with the modulating reference signal from the source 12 into a phase detector PSD13, by which synchronous detection is carried out. The demodulated signal is recorded 14. With such constitution, the amplitudes of the sources 5, 12 are adjusted to make the magnetic fields around both elements 4, 11 equal prior to detection of the information recorded in a medium, whereby the output of the PSD13 inputted with the output at the intermediate point thereof and the modulating reference signal is set at a constant value. Next, when the information signal on the recording medium is detected, the signal free from any noise is recorded 14 by the synchronous detection in the PSD13.
JP55147865A 1980-10-22 1980-10-22 Read out system for magnetoresistive element Pending JPS5771504A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55147865A JPS5771504A (en) 1980-10-22 1980-10-22 Read out system for magnetoresistive element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55147865A JPS5771504A (en) 1980-10-22 1980-10-22 Read out system for magnetoresistive element

Publications (1)

Publication Number Publication Date
JPS5771504A true JPS5771504A (en) 1982-05-04

Family

ID=15439987

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55147865A Pending JPS5771504A (en) 1980-10-22 1980-10-22 Read out system for magnetoresistive element

Country Status (1)

Country Link
JP (1) JPS5771504A (en)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01291180A (en) * 1988-05-17 1989-11-22 Sharp Corp Magnetism detecting device
JPH0335182A (en) * 1989-06-30 1991-02-15 Sharp Corp Instrument for measuring superconducting magnetic field
US8362765B2 (en) 2007-09-21 2013-01-29 Nxp B.V. Sensor device and method
JP2016519310A (en) * 2013-05-10 2016-06-30 アレグロ・マイクロシステムズ・エルエルシー Magnetic field sensor resistant to external magnetic effects
US10310028B2 (en) 2017-05-26 2019-06-04 Allegro Microsystems, Llc Coil actuated pressure sensor
US10324141B2 (en) 2017-05-26 2019-06-18 Allegro Microsystems, Llc Packages for coil actuated position sensors
US10641842B2 (en) 2017-05-26 2020-05-05 Allegro Microsystems, Llc Targets for coil actuated position sensors
US10837943B2 (en) 2017-05-26 2020-11-17 Allegro Microsystems, Llc Magnetic field sensor with error calculation
US10955306B2 (en) 2019-04-22 2021-03-23 Allegro Microsystems, Llc Coil actuated pressure sensor and deformable substrate
US10996289B2 (en) 2017-05-26 2021-05-04 Allegro Microsystems, Llc Coil actuated position sensor with reflected magnetic field
US11061084B2 (en) 2019-03-07 2021-07-13 Allegro Microsystems, Llc Coil actuated pressure sensor and deflectable substrate
US11262422B2 (en) 2020-05-08 2022-03-01 Allegro Microsystems, Llc Stray-field-immune coil-activated position sensor
US11428755B2 (en) 2017-05-26 2022-08-30 Allegro Microsystems, Llc Coil actuated sensor with sensitivity detection
US11493361B2 (en) 2021-02-26 2022-11-08 Allegro Microsystems, Llc Stray field immune coil-activated sensor
US11578997B1 (en) 2021-08-24 2023-02-14 Allegro Microsystems, Llc Angle sensor using eddy currents

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01291180A (en) * 1988-05-17 1989-11-22 Sharp Corp Magnetism detecting device
JPH0335182A (en) * 1989-06-30 1991-02-15 Sharp Corp Instrument for measuring superconducting magnetic field
US8362765B2 (en) 2007-09-21 2013-01-29 Nxp B.V. Sensor device and method
JP2016519310A (en) * 2013-05-10 2016-06-30 アレグロ・マイクロシステムズ・エルエルシー Magnetic field sensor resistant to external magnetic effects
US10837943B2 (en) 2017-05-26 2020-11-17 Allegro Microsystems, Llc Magnetic field sensor with error calculation
US11320496B2 (en) 2017-05-26 2022-05-03 Allegro Microsystems, Llc Targets for coil actuated position sensors
US10641842B2 (en) 2017-05-26 2020-05-05 Allegro Microsystems, Llc Targets for coil actuated position sensors
US10649042B2 (en) 2017-05-26 2020-05-12 Allegro Microsystems, Llc Packages for coil actuated position sensors
US10310028B2 (en) 2017-05-26 2019-06-04 Allegro Microsystems, Llc Coil actuated pressure sensor
US11768256B2 (en) 2017-05-26 2023-09-26 Allegro Microsystems, Llc Coil actuated sensor with sensitivity detection
US10996289B2 (en) 2017-05-26 2021-05-04 Allegro Microsystems, Llc Coil actuated position sensor with reflected magnetic field
US11428755B2 (en) 2017-05-26 2022-08-30 Allegro Microsystems, Llc Coil actuated sensor with sensitivity detection
US11073573B2 (en) 2017-05-26 2021-07-27 Allegro Microsystems, Llc Packages for coil actuated position sensors
US10324141B2 (en) 2017-05-26 2019-06-18 Allegro Microsystems, Llc Packages for coil actuated position sensors
US11061084B2 (en) 2019-03-07 2021-07-13 Allegro Microsystems, Llc Coil actuated pressure sensor and deflectable substrate
US10955306B2 (en) 2019-04-22 2021-03-23 Allegro Microsystems, Llc Coil actuated pressure sensor and deformable substrate
US11262422B2 (en) 2020-05-08 2022-03-01 Allegro Microsystems, Llc Stray-field-immune coil-activated position sensor
US11493361B2 (en) 2021-02-26 2022-11-08 Allegro Microsystems, Llc Stray field immune coil-activated sensor
US11578997B1 (en) 2021-08-24 2023-02-14 Allegro Microsystems, Llc Angle sensor using eddy currents

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