JPS57163887A - Detector for metallic piece residing in paper, etc. - Google Patents

Detector for metallic piece residing in paper, etc.

Info

Publication number
JPS57163887A
JPS57163887A JP56048400A JP4840081A JPS57163887A JP S57163887 A JPS57163887 A JP S57163887A JP 56048400 A JP56048400 A JP 56048400A JP 4840081 A JP4840081 A JP 4840081A JP S57163887 A JPS57163887 A JP S57163887A
Authority
JP
Japan
Prior art keywords
metallic piece
resonance
metallic
signal
piece
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
JP56048400A
Other languages
Japanese (ja)
Inventor
Takeshi Ishida
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP56048400A priority Critical patent/JPS57163887A/en
Priority to AT82300076T priority patent/ATE22743T1/en
Priority to EP82300076A priority patent/EP0057972B1/en
Priority to DE8282300076T priority patent/DE3273668D1/en
Publication of JPS57163887A publication Critical patent/JPS57163887A/en
Priority to US06/645,533 priority patent/US4536709A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/04—Testing magnetic properties of the materials thereof, e.g. by detection of magnetic imprint
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
    • G01V3/104—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils using several coupled or uncoupled coils
    • G01V3/105—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils using several coupled or uncoupled coils forming directly coupled primary and secondary coils or loops

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electromagnetism (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

PURPOSE:To detect the presence of a metallic piece residing in paper, etc. securely by detecting variation in the Q of a resonance circuit when the metallic piece passes between the 1st and 2nd coils. CONSTITUTION:Through the operation of an oscillator 11, a high frequency signal of a sine wave is supplied to a transmitting coil 5 to generate a magnetic field 7, thereby allowing resonance circuits consisting of receiving coils 61-65 and capacitors 121-125 to resonate. In this state, paper money P wherein there is a metallic piece 2 is conveyed and when it passes between detection heads 41 and 42, an eddy current loss is generated at the metallic piece 2 to decrease the Q of the resonance circuits, so that their resonance signal A decreases in amplitude. The resonance signal A is supplied through a detecting circuit 13, an amplifier 14, and a clamping circuit 15 to a comparator 16, which compares it with a reference level signal 17. A combinatorial logical circuit 18 discriminates the presence of the metallic piece when three or four out of the comparators 161-165 generate metallic-piece detection signals at the same time, thereby outputting a detection signal.
JP56048400A 1981-01-12 1981-04-02 Detector for metallic piece residing in paper, etc. Pending JPS57163887A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP56048400A JPS57163887A (en) 1981-04-02 1981-04-02 Detector for metallic piece residing in paper, etc.
AT82300076T ATE22743T1 (en) 1981-01-12 1982-01-07 DEVICE FOR DETECTING A METAL STRIP INSERTED IN PAPER.
EP82300076A EP0057972B1 (en) 1981-01-12 1982-01-07 A device for detecting a metal strip embedded in paper
DE8282300076T DE3273668D1 (en) 1981-01-12 1982-01-07 A device for detecting a metal strip embedded in paper
US06/645,533 US4536709A (en) 1981-01-12 1984-08-29 Detecting device having spaced transmitting and receiving coils for detecting a metal strip embedded in paper money

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56048400A JPS57163887A (en) 1981-04-02 1981-04-02 Detector for metallic piece residing in paper, etc.

Publications (1)

Publication Number Publication Date
JPS57163887A true JPS57163887A (en) 1982-10-08

Family

ID=12802247

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56048400A Pending JPS57163887A (en) 1981-01-12 1981-04-02 Detector for metallic piece residing in paper, etc.

Country Status (1)

Country Link
JP (1) JPS57163887A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014155866A1 (en) * 2013-03-28 2014-10-02 日本電産サンキョー株式会社 Foreign matter detection device and foreign matter detection method
WO2014155865A1 (en) * 2013-03-28 2014-10-02 日本電産サンキョー株式会社 Foreign matter detection device and foreign matter detection method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4839745A (en) * 1971-09-17 1973-06-11

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4839745A (en) * 1971-09-17 1973-06-11

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014155866A1 (en) * 2013-03-28 2014-10-02 日本電産サンキョー株式会社 Foreign matter detection device and foreign matter detection method
WO2014155865A1 (en) * 2013-03-28 2014-10-02 日本電産サンキョー株式会社 Foreign matter detection device and foreign matter detection method

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