TW360799B - A sensor for detecting a ferromagnetic object - Google Patents

A sensor for detecting a ferromagnetic object

Info

Publication number
TW360799B
TW360799B TW087108582A TW87108582A TW360799B TW 360799 B TW360799 B TW 360799B TW 087108582 A TW087108582 A TW 087108582A TW 87108582 A TW87108582 A TW 87108582A TW 360799 B TW360799 B TW 360799B
Authority
TW
Taiwan
Prior art keywords
magnetic field
ferromagnetic object
magnetic
ferromagnetic
permanent magnet
Prior art date
Application number
TW087108582A
Other languages
Chinese (zh)
Inventor
Hideto Konno
Original Assignee
Nec Corp
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 Nec Corp filed Critical Nec Corp
Application granted granted Critical
Publication of TW360799B publication Critical patent/TW360799B/en

Links

Landscapes

  • Measuring Magnetic Variables (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

A ferromagnetic object passage sensor has a permanent magnet and a horizontal magnetic field magnetosensitive device for detecting a magnetic field parallel to a device service thereof, the permanent magnet and the horizontal magnetic field magnetosensitive device being mounted on a holder having a through a hole for passage of a ferromagnetic object to be detected. The magnetosensitive device is disposed substantially parallel to the magnetic pole surface of the permanent magnet and given a magnetic bias for producing a saturated out put signal due to a magnetic field distribution parallel to the magnetic pole service of the permanent magnetic upon absent of ferromagnetic the object when the magnetic field distribution is changed by the passage of the ferromagnetic object. The ferromagnetic object passage sensor can be deigned with increased freedom, and is prevented from operating in error due to an external magnetic field.
TW087108582A 1997-06-27 1998-05-29 A sensor for detecting a ferromagnetic object TW360799B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18608597A JPH1123724A (en) 1997-06-27 1997-06-27 Sensor for ferromagnetic object transit

Publications (1)

Publication Number Publication Date
TW360799B true TW360799B (en) 1999-06-11

Family

ID=16182120

Family Applications (1)

Application Number Title Priority Date Filing Date
TW087108582A TW360799B (en) 1997-06-27 1998-05-29 A sensor for detecting a ferromagnetic object

Country Status (2)

Country Link
JP (1) JPH1123724A (en)
TW (1) TW360799B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5241200B2 (en) * 2007-10-30 2013-07-17 双日マシナリー株式会社 Magnetic detection method

Also Published As

Publication number Publication date
JPH1123724A (en) 1999-01-29

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Legal Events

Date Code Title Description
MM4A Annulment or lapse of patent due to non-payment of fees