JPS5714219A - Proximity switch - Google Patents

Proximity switch

Info

Publication number
JPS5714219A
JPS5714219A JP8955880A JP8955880A JPS5714219A JP S5714219 A JPS5714219 A JP S5714219A JP 8955880 A JP8955880 A JP 8955880A JP 8955880 A JP8955880 A JP 8955880A JP S5714219 A JPS5714219 A JP S5714219A
Authority
JP
Japan
Prior art keywords
circuit
oscillating circuit
frequency
output
oscillating
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
JP8955880A
Other languages
Japanese (ja)
Inventor
Hiroyuki Miyamoto
Hisatoshi Nodera
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.)
Omron Corp
Original Assignee
Omron Tateisi Electronics Co
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 Omron Tateisi Electronics Co filed Critical Omron Tateisi Electronics Co
Priority to JP8955880A priority Critical patent/JPS5714219A/en
Publication of JPS5714219A publication Critical patent/JPS5714219A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/95—Proximity switches using a magnetic detector
    • H03K17/952—Proximity switches using a magnetic detector using inductive coils
    • H03K17/9537—Proximity switches using a magnetic detector using inductive coils in a resonant circuit
    • H03K17/9542—Proximity switches using a magnetic detector using inductive coils in a resonant circuit forming part of an oscillator
    • H03K17/9545—Proximity switches using a magnetic detector using inductive coils in a resonant circuit forming part of an oscillator with variable frequency

Landscapes

  • Electronic Switches (AREA)

Abstract

PURPOSE:To form a priximity switch which has the high stability and detection precision of a circuit, by converting a detection signal into a pulse signal (digital value) when processing the detection signal. CONSTITUTION:An oscillating circuit 11 is used as a reference signal source, and an oscillating circuit 12 uses a detection coil and serves as a detecting oscillating circuit whose frequency varied as an object to be detected approaches. The outputs of the oscillating circuit 11 and 12 are inputted to a digital phase comparating circuit 13 to output a pulse width signal which corresponds to a difference in input frequency, and the output is inputted to a storing circuit (flip-flop circuit) 16 via low-pass filters 14 and 15. The frequency of the oscillating circuit 12 is set lower than that of the oscillating circuit 11 and as the object to be detected approaches, the frequency of the oscillating circuit 12 increases and when it surpasses that of the oscillating circuit 11, the output of the storing circuit 16 is inverted and a load is put in operation by a current amplifying circuit 17.
JP8955880A 1980-06-30 1980-06-30 Proximity switch Pending JPS5714219A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8955880A JPS5714219A (en) 1980-06-30 1980-06-30 Proximity switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8955880A JPS5714219A (en) 1980-06-30 1980-06-30 Proximity switch

Publications (1)

Publication Number Publication Date
JPS5714219A true JPS5714219A (en) 1982-01-25

Family

ID=13974143

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8955880A Pending JPS5714219A (en) 1980-06-30 1980-06-30 Proximity switch

Country Status (1)

Country Link
JP (1) JPS5714219A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6454814A (en) * 1987-08-25 1989-03-02 Sunx Ltd Magnetic proximity switch
EP1152533A1 (en) * 2000-05-02 2001-11-07 Schneider Electric Industries SA Inductive or capacitive detector

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6454814A (en) * 1987-08-25 1989-03-02 Sunx Ltd Magnetic proximity switch
EP1152533A1 (en) * 2000-05-02 2001-11-07 Schneider Electric Industries SA Inductive or capacitive detector
FR2808597A1 (en) * 2000-05-02 2001-11-09 Schneider Electric Ind Sa INDUCTIVE OR CAPACITIVE DETECTOR

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