FR2263642A1 - Capacitive proximity alarm - has plug varying resonant frequency of oscillator reference and control coils - Google Patents

Capacitive proximity alarm - has plug varying resonant frequency of oscillator reference and control coils

Info

Publication number
FR2263642A1
FR2263642A1 FR7407484A FR7407484A FR2263642A1 FR 2263642 A1 FR2263642 A1 FR 2263642A1 FR 7407484 A FR7407484 A FR 7407484A FR 7407484 A FR7407484 A FR 7407484A FR 2263642 A1 FR2263642 A1 FR 2263642A1
Authority
FR
France
Prior art keywords
winding
plug
resonant frequency
proximity alarm
capacitive proximity
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
FR7407484A
Other languages
French (fr)
Other versions
FR2263642B3 (en
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.)
FAEAM
Original Assignee
FAEAM
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 FAEAM filed Critical FAEAM
Priority to FR7407484A priority Critical patent/FR2263642A1/en
Publication of FR2263642A1 publication Critical patent/FR2263642A1/en
Application granted granted Critical
Publication of FR2263642B3 publication Critical patent/FR2263642B3/fr
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
    • H03K17/16—Modifications for eliminating interference voltages or currents
    • 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
    • H03K17/955—Proximity switches using a capacitive detector

Landscapes

  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Electronic Switches (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

The proximity alarm, particularly designed to operate when approached by a person or by a hand, is based on the principle of change in capacity of an oscillatory circuit normally not oscillating but producing an oscillatory output and energising a relay when the capacitance changes. Protection against parasitic effects is obtained by offsetting the resonant frequencies of the tuned circuits making up the base to collector feedback transformer. The base winding is connected to the proximity detector plate and wound side by side with the collector winding on the same transformer, tuning beng affected by an adjustable ferrite slug extending entirely through one winding and partly into the other.
FR7407484A 1974-03-05 1974-03-05 Capacitive proximity alarm - has plug varying resonant frequency of oscillator reference and control coils Granted FR2263642A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7407484A FR2263642A1 (en) 1974-03-05 1974-03-05 Capacitive proximity alarm - has plug varying resonant frequency of oscillator reference and control coils

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7407484A FR2263642A1 (en) 1974-03-05 1974-03-05 Capacitive proximity alarm - has plug varying resonant frequency of oscillator reference and control coils

Publications (2)

Publication Number Publication Date
FR2263642A1 true FR2263642A1 (en) 1975-10-03
FR2263642B3 FR2263642B3 (en) 1978-04-14

Family

ID=9135869

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7407484A Granted FR2263642A1 (en) 1974-03-05 1974-03-05 Capacitive proximity alarm - has plug varying resonant frequency of oscillator reference and control coils

Country Status (1)

Country Link
FR (1) FR2263642A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2683084A3 (en) * 2012-07-06 2014-08-06 abatec group AG HGV anti-theft device incorporating a cord
US20160009884A1 (en) * 2013-04-06 2016-01-14 Mitsubishi Plastics, Inc. Coated film

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2683084A3 (en) * 2012-07-06 2014-08-06 abatec group AG HGV anti-theft device incorporating a cord
US20160009884A1 (en) * 2013-04-06 2016-01-14 Mitsubishi Plastics, Inc. Coated film

Also Published As

Publication number Publication date
FR2263642B3 (en) 1978-04-14

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