Title:
TEMPERATURE SENSOR
Document Type and Number:
Japanese Patent JPH01155224
Kind Code:
A
Abstract:
PURPOSE:To detect accurate temp., by providing an optical detector for detecting the displacement of a movable part varying by the change in the transmitted magnetic flux of a temp.- sensitive magnetic body constituting a magnetic circuit along with a magnet. CONSTITUTION:The change curves of the attraction force F between a magnet 2 and a temp.- sensitive magnetic body 1 to temp. at times when the magnet 2 is present at the position of a solid line (a) (a state wherein the magnet 2 is attracted to the temp.-sensitive magnetic body 1) and a two-dot broken line (a state wherein the magnet is attracted to a magnetic body 3) are F1a, F1b and the curves showing the changes of the attraction force F2 between the magnet 2 and the magnetic body 3 to temp. at times when the magnet 2 is present at the positions of the solid line (a) and two-dot broken line (b) are F2a, F2b. Now, when the magnet 2 is present at the solid line position and T1 corresponding to the intersecting point C of the temp. curves F1a, F2a is exceeded, the attraction force F2 between the magnet 2 and the magnetic body 3 becomes larger than attraction force F1 and, therefore, the magnet 2 is attracted to the magnetic body 3 as shown by the two-dot broken line (b). When temp. is lowered in the b-state to become lower than T2 corresponding to an intersecting point D, the magnet 2 is attracted to the temp.-sensitive magnetic body 1 and no current does not flow to the magnet 2 and the disturbance of a magnetic field is not generated.
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Inventors:
KATO TOMIO
HIRAYAMA KOZO
NAKAGAWA SHIRO
HIRAYAMA KOZO
NAKAGAWA SHIRO
Application Number:
JP31495487A
Publication Date:
June 19, 1989
Filing Date:
December 12, 1987
Export Citation:
Assignee:
TDK CORP
International Classes:
G01K11/12; G01K7/36; (IPC1-7): G01K7/36; G01K11/12
Attorney, Agent or Firm:
Shoichi Wakata