PHYSICAL QUANTITY SENSOR - RYOWA DENSHI KK

Title:

PHYSICAL QUANTITY SENSOR

Document Type and Number:

Japanese Patent JP2001281070

Kind Code:

A

Abstract:

To provide a physical quantity sensor which detects physical quantities at a distant position.

A magnetic field is generated in a coil 12 by oscillation of a positive feedback oscillation circuit 1 which contains an amplifier 11 and the coil 12 in a feedback path. A physical quantity detecting part 2 is constituted of a tank circuit comprising a coil 13 and a capacitor 15 connected in parallel with the coil 13, which is wound around magnetic material 14 having temperature sensing characteristic and couples electromagnetically with the coil 12. The detecting part 2 converts an environmental temperature of the coil 13 into a frequency, detects an oscillation frequency of the positive feedback oscillation circuit 1, and measures the physical quantity on the basis of the frequency.

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Inventors:

ARAI KENICHI
ISHIYAMA KAZUYUKI
INOUE MITSUTERU
KIN EIGAKU
ITAGAKI ATSUSHI
YOSHIDA TETSUO

Application Number:

JP2000089505A

Publication Date:

October 10, 2001

Filing Date:

March 28, 2000

Export Citation:

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Assignee:

RYOWA DENSHI KK
TOKIN CORP

International Classes:

G01P15/11; G01D5/20; G01D5/24; G01K7/34; G01K7/36; G01L9/10; G01L9/12; G01P15/125; (IPC1-7): G01K7/34; G01D5/20; G01D5/24; G01K7/36; G01L9/10; G01L9/12; G01P15/11; G01P15/125

Attorney, Agent or Firm:

Takehiro Chiba (1 outside)

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