DE1774444A1 - UEberwachungsgeraet - Google Patents

UEberwachungsgeraet

Info

Publication number
DE1774444A1
DE1774444A1 DE19681774444 DE1774444A DE1774444A1 DE 1774444 A1 DE1774444 A1 DE 1774444A1 DE 19681774444 DE19681774444 DE 19681774444 DE 1774444 A DE1774444 A DE 1774444A DE 1774444 A1 DE1774444 A1 DE 1774444A1
Authority
DE
Germany
Prior art keywords
magnetic
needle
detector
magnet
relative
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
DE19681774444
Other languages
German (de)
English (en)
Inventor
John Diver
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of DE1774444A1 publication Critical patent/DE1774444A1/de
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2405—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
    • G08B13/2408—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using ferromagnetic tags
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2468—Antenna in system and the related signal processing
    • G08B13/2477—Antenna or antenna activator circuit

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Burglar Alarm Systems (AREA)
DE19681774444 1967-06-27 1968-06-20 UEberwachungsgeraet Pending DE1774444A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB2953367 1967-06-27
GB5021867A GB1234762A (en) 1967-06-27 1967-06-27 Detection apparatus
GB3714667 1967-08-12
GB4322067 1967-09-22

Publications (1)

Publication Number Publication Date
DE1774444A1 true DE1774444A1 (de) 1971-06-24

Family

ID=27448766

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19681774444 Pending DE1774444A1 (de) 1967-06-27 1968-06-20 UEberwachungsgeraet

Country Status (7)

Country Link
BE (1) BE717228A (https=)
CH (1) CH495596A (https=)
DE (1) DE1774444A1 (https=)
FR (1) FR1571102A (https=)
GB (1) GB1234762A (https=)
LU (1) LU56333A1 (https=)
NL (1) NL6809085A (https=)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2154350A (en) * 1984-02-17 1985-09-04 Standard Telephones Cables Ltd Preventing misuse of information stored on computer tapes and the like

Also Published As

Publication number Publication date
LU56333A1 (https=) 1968-09-30
FR1571102A (https=) 1969-06-13
CH495596A (fr) 1970-08-31
NL6809085A (https=) 1968-12-30
GB1234762A (en) 1971-06-09
BE717228A (https=) 1968-12-02

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