GB1242454A - Detection system - Google Patents

Detection system

Info

Publication number
GB1242454A
GB1242454A GB37742/68A GB3774268A GB1242454A GB 1242454 A GB1242454 A GB 1242454A GB 37742/68 A GB37742/68 A GB 37742/68A GB 3774268 A GB3774268 A GB 3774268A GB 1242454 A GB1242454 A GB 1242454A
Authority
GB
United Kingdom
Prior art keywords
antenna
charge
alarm
intruder
scr
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.)
Expired
Application number
GB37742/68A
Inventor
Carl Frederick Klein
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.)
Johnson Service Co
Original Assignee
Johnson Service 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 Johnson Service Co filed Critical Johnson Service Co
Publication of GB1242454A publication Critical patent/GB1242454A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/26—Electrical actuation by proximity of an intruder causing variation in capacitance or inductance of a circuit

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

1,242,454. Intruder alarm systems. JOHNSON SERVICE CO. 7 Aug., 1968 [7 Aug., 1967], No. 37742/68. Heading G4N. [Also in Division H3] An intruder alarm comprises an antenna 1, 2 charged from a D.C. supply 11 and connected to the gate of at least one field effect transistor 7, arranged to operate an alarm 5 in the event of variation in charge on the antenna 1, 2. As described, the antenna 1, 2 may be a pair of wires used to protect a door or window, or a multiplicity of wires to protect an entire building or area, or may be formed by a safe. Increase in charge on antenna 1, 2 due to proximity of an intruder, increases the conduction of a p.channel insulated gate, field effect transistor (FET) 7 which turns on a silicon controlled rectifier (SCR) 22 and operates an unspecified audible or visiblea arm 5. Reduction in charge on antenna 1, 2 causes increase in current in n-channel FET 8 which turns on SCR 22<SP>1</SP> and operates alarm circuit 6.
GB37742/68A 1967-08-07 1968-08-07 Detection system Expired GB1242454A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US65886867A 1967-08-07 1967-08-07

Publications (1)

Publication Number Publication Date
GB1242454A true GB1242454A (en) 1971-08-11

Family

ID=24643046

Family Applications (1)

Application Number Title Priority Date Filing Date
GB37742/68A Expired GB1242454A (en) 1967-08-07 1968-08-07 Detection system

Country Status (4)

Country Link
US (1) US3543056A (en)
DE (1) DE1766889A1 (en)
FR (1) FR1582601A (en)
GB (1) GB1242454A (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2113053A1 (en) * 1970-03-19 1971-09-30 Kureha Chemical Ind Co Ltd Method and device for controlling an electrical circuit
US3696359A (en) * 1971-01-26 1972-10-03 Sperry Rand Corp Intrusion alarm system
US3757322A (en) * 1971-02-03 1973-09-04 Hall Barkan Instr Inc Transparent touch controlled interface with interreactively related display
US4160923A (en) * 1975-02-05 1979-07-10 Sharp Kabushiki Kaisha Touch sensitive electronic switching circuit for electronic wristwatches
US4038653A (en) * 1976-03-16 1977-07-26 International Standard Electric Corporation Train position indicator
DE69324067T2 (en) * 1992-06-08 1999-07-15 Synaptics Inc Object position detector
US6028271A (en) * 1992-06-08 2000-02-22 Synaptics, Inc. Object position detector with edge motion feature and gesture recognition
US5889236A (en) * 1992-06-08 1999-03-30 Synaptics Incorporated Pressure sensitive scrollbar feature
US5861583A (en) * 1992-06-08 1999-01-19 Synaptics, Incorporated Object position detector
US6239389B1 (en) 1992-06-08 2001-05-29 Synaptics, Inc. Object position detection system and method
US5880411A (en) 1992-06-08 1999-03-09 Synaptics, Incorporated Object position detector with edge motion feature and gesture recognition
US6380929B1 (en) 1996-09-20 2002-04-30 Synaptics, Incorporated Pen drawing computer input device
US5854625A (en) * 1996-11-06 1998-12-29 Synaptics, Incorporated Force sensing touchpad
US8810249B2 (en) * 2009-03-20 2014-08-19 Thomas G. Cehelnik E-field sensor arrays for interactive gaming, computer interfaces, machine vision, medical imaging, and geological exploration CIP

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2100756A (en) * 1935-11-29 1937-11-30 Rca Corp Alternating current control
US2556458A (en) * 1948-02-09 1951-06-12 W E Anderson Inc Static electricity indicator
GB1009271A (en) * 1963-03-04 1965-11-10 Associated Fire Alarms Ltd Improvements in or relating to smoke detector circuits
US3300585A (en) * 1963-09-04 1967-01-24 Northern Electric Co Self-polarized electrostatic microphone-semiconductor amplifier combination
US3329838A (en) * 1964-06-09 1967-07-04 Ideal Ind Capacitor operated scr switching circuit
US3375493A (en) * 1965-06-30 1968-03-26 Gen Precision Systems Inc Inductive loop presence detector
US3422415A (en) * 1965-12-20 1969-01-14 Masuo Ichimori Proximity detecting apparatus

Also Published As

Publication number Publication date
FR1582601A (en) 1969-10-03
US3543056A (en) 1970-11-24
DE1766889A1 (en) 1971-09-16

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