JPS57199332A - Proximity switch circuit - Google Patents

Proximity switch circuit

Info

Publication number
JPS57199332A
JPS57199332A JP8462181A JP8462181A JPS57199332A JP S57199332 A JPS57199332 A JP S57199332A JP 8462181 A JP8462181 A JP 8462181A JP 8462181 A JP8462181 A JP 8462181A JP S57199332 A JPS57199332 A JP S57199332A
Authority
JP
Japan
Prior art keywords
circuit
current
oscillation
proximity switch
parting
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.)
Granted
Application number
JP8462181A
Other languages
Japanese (ja)
Other versions
JPH0139247B2 (en
Inventor
Masahei Akasu
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP8462181A priority Critical patent/JPS57199332A/en
Publication of JPS57199332A publication Critical patent/JPS57199332A/en
Publication of JPH0139247B2 publication Critical patent/JPH0139247B2/ja
Granted 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
    • H03K17/9547—Proximity switches using a magnetic detector using inductive coils in a resonant circuit forming part of an oscillator with variable amplitude

Abstract

PURPOSE:To obtain a stable output signal at the parting of a body to be detected, by supplying a current of AC component with a prescribed frequency and amplitude to an oscillation circuit of a proximity switch and regulating the oscillation condition of the proximity switch with the current of AC component. CONSTITUTION:An oscillation circuit 1 is provided with a parallel resonance circuit consisting of a coil 4 and a capacitor 5 and a current mirror circuit in which an output current determined with an active current value of a transistor TR8 is generated from a TR9 and given to a parallel resonance circuit. The active current value of the TR8 is determined corresponding to a parallel circuit generating voltage and the oscillating voltage of the circuit 1 is compared with a comparison voltage at a comparison circuit 2. On the output current of the TR8 determined with the comparison circuit 2, a current including the AC component of an AC power supply 15 with a prescribed amplitude and frequency is superimposed. Thus, the start of oscillation after the parting of a body to be detected is made from a prescribed amplitude, allowing to remarkably reduce the delay time until the output is inverted after the parting of the body to be detected.
JP8462181A 1981-06-02 1981-06-02 Proximity switch circuit Granted JPS57199332A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8462181A JPS57199332A (en) 1981-06-02 1981-06-02 Proximity switch circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8462181A JPS57199332A (en) 1981-06-02 1981-06-02 Proximity switch circuit

Publications (2)

Publication Number Publication Date
JPS57199332A true JPS57199332A (en) 1982-12-07
JPH0139247B2 JPH0139247B2 (en) 1989-08-18

Family

ID=13835749

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8462181A Granted JPS57199332A (en) 1981-06-02 1981-06-02 Proximity switch circuit

Country Status (1)

Country Link
JP (1) JPS57199332A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61199327A (en) * 1985-02-28 1986-09-03 Omron Tateisi Electronics Co Proximity switch
DE3519714A1 (en) * 1985-06-01 1986-12-04 Ifm Electronic Gmbh, 4300 Essen Electronic switching device operating contactlessly
US4644298A (en) * 1984-07-27 1987-02-17 Omron Tateisi Electronics Co. Proximity switch

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4644298A (en) * 1984-07-27 1987-02-17 Omron Tateisi Electronics Co. Proximity switch
JPS61199327A (en) * 1985-02-28 1986-09-03 Omron Tateisi Electronics Co Proximity switch
DE3519714A1 (en) * 1985-06-01 1986-12-04 Ifm Electronic Gmbh, 4300 Essen Electronic switching device operating contactlessly

Also Published As

Publication number Publication date
JPH0139247B2 (en) 1989-08-18

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