JPS5742817A - Optical float switch - Google Patents

Optical float switch

Info

Publication number
JPS5742817A
JPS5742817A JP11696880A JP11696880A JPS5742817A JP S5742817 A JPS5742817 A JP S5742817A JP 11696880 A JP11696880 A JP 11696880A JP 11696880 A JP11696880 A JP 11696880A JP S5742817 A JPS5742817 A JP S5742817A
Authority
JP
Japan
Prior art keywords
magnet
detected
cylinder
water
thermoferrite
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
JP11696880A
Other languages
Japanese (ja)
Inventor
Kuninori Okamoto
Yoshiaki Kanbe
Yasushi Mori
Koji Yamashita
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.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works 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 Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP11696880A priority Critical patent/JPS5742817A/en
Publication of JPS5742817A publication Critical patent/JPS5742817A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
    • G01F23/64—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements
    • G01F23/68—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements using electrically actuated indicating means
    • G01F23/686—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements using electrically actuated indicating means using opto-electrically actuated indicating means

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Level Indicators Using A Float (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)

Abstract

PURPOSE:To prevent an electric shock and to improve corrosion resistance by installing a movable magnet opposite to an optical fiber at the inside of an airthight cylinder and thermoferrite at the outside of it for the detection of a water level and temperature in a bathtub. CONSTITUTION:Inside of an airtight cylinder 2 made of a nonmagnetic material forming a sensor part, a magnet 3 is installed vertically movably opposite to an optical fiber 1. The magnet 3 is so magntized that it attracts and drives a magnetic body 4b in a float 4 moving up and down around the cylinder 2. A magnet flank 3a is finished as a mirror surface and as the magnetic body 4b, thermoferrite or the like whose magnetic resistance increases greatly at 50-60 deg.C. Then, as the level of water wherein the sensor part like this is installed rises, the flat 4 and magnet 3 rise and variations of emitted light Li from the fiber and its return light Lr are detected. A rise in water temperature is detected as a decrease in the return light Lr as a result of the falling of only the magnet 3. The falling of the water level due to the loosening of a spigot is also detected.
JP11696880A 1980-08-27 1980-08-27 Optical float switch Pending JPS5742817A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11696880A JPS5742817A (en) 1980-08-27 1980-08-27 Optical float switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11696880A JPS5742817A (en) 1980-08-27 1980-08-27 Optical float switch

Publications (1)

Publication Number Publication Date
JPS5742817A true JPS5742817A (en) 1982-03-10

Family

ID=14700205

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11696880A Pending JPS5742817A (en) 1980-08-27 1980-08-27 Optical float switch

Country Status (1)

Country Link
JP (1) JPS5742817A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59147290A (en) * 1983-02-14 1984-08-23 Niles Parts Co Ltd Movement detector using optical fiber
US4551601A (en) * 1983-07-11 1985-11-05 Kabushiki Kaisha Toshiba Heat cooking apparatus with temperature operating system
JPH03155089A (en) * 1989-11-14 1991-07-03 Matsushita Electric Ind Co Ltd Induction heater cooking device
US7714732B2 (en) 2007-05-31 2010-05-11 Cox Raleigh I Optical switch
US7772538B2 (en) 2005-10-03 2010-08-10 Cox Raleigh L Float activated optical switch
US7902989B2 (en) 2007-05-31 2011-03-08 Cox Raleigh L Optical switch
US8334501B1 (en) 2008-10-16 2012-12-18 Cox Christopher E Optical switch activator with glowable member
US8643498B1 (en) 2010-07-13 2014-02-04 Christopher E. Cox Optical switches for tank environments
US9383518B2 (en) 2012-12-14 2016-07-05 Christopher E. Cox Optical switch activator
US10840045B1 (en) 2019-06-04 2020-11-17 Christopher E. Cox Invertible optical float switch

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59147290A (en) * 1983-02-14 1984-08-23 Niles Parts Co Ltd Movement detector using optical fiber
US4551601A (en) * 1983-07-11 1985-11-05 Kabushiki Kaisha Toshiba Heat cooking apparatus with temperature operating system
JPH03155089A (en) * 1989-11-14 1991-07-03 Matsushita Electric Ind Co Ltd Induction heater cooking device
US7772538B2 (en) 2005-10-03 2010-08-10 Cox Raleigh L Float activated optical switch
US7714732B2 (en) 2007-05-31 2010-05-11 Cox Raleigh I Optical switch
US7902989B2 (en) 2007-05-31 2011-03-08 Cox Raleigh L Optical switch
US8314711B2 (en) 2007-05-31 2012-11-20 Raleigh L Cox Optical switch
US8334501B1 (en) 2008-10-16 2012-12-18 Cox Christopher E Optical switch activator with glowable member
US8658962B2 (en) 2008-10-16 2014-02-25 Christopher E. Cox Optical switch with glowable activator portion
US8643498B1 (en) 2010-07-13 2014-02-04 Christopher E. Cox Optical switches for tank environments
US9383518B2 (en) 2012-12-14 2016-07-05 Christopher E. Cox Optical switch activator
US10840045B1 (en) 2019-06-04 2020-11-17 Christopher E. Cox Invertible optical float switch

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