ZA742303B - Field strength uniformity control system - Google Patents

Field strength uniformity control system

Info

Publication number
ZA742303B
ZA742303B ZA00742303A ZA742303A ZA742303B ZA 742303 B ZA742303 B ZA 742303B ZA 00742303 A ZA00742303 A ZA 00742303A ZA 742303 A ZA742303 A ZA 742303A ZA 742303 B ZA742303 B ZA 742303B
Authority
ZA
South Africa
Prior art keywords
control system
field strength
uniformity control
strength uniformity
field
Prior art date
Application number
ZA00742303A
Other languages
English (en)
Inventor
A Minasy
R Pruzick
Original Assignee
Knogo 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 Knogo Corp filed Critical Knogo Corp
Publication of ZA742303B publication Critical patent/ZA742303B/xx

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
    • G08B13/24—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
    • G08B13/2471—Antenna signal processing by receiver or emitter
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Burglar Alarm Systems (AREA)
  • Geophysics And Detection Of Objects (AREA)
ZA00742303A 1973-04-13 1974-04-10 Field strength uniformity control system ZA742303B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00351018A US3838409A (en) 1973-04-13 1973-04-13 Field strength uniformity control system for article theft detection system

Publications (1)

Publication Number Publication Date
ZA742303B true ZA742303B (en) 1975-03-26

Family

ID=23379238

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA00742303A ZA742303B (en) 1973-04-13 1974-04-10 Field strength uniformity control system

Country Status (11)

Country Link
US (2) US3838409A (xx)
JP (1) JPS5331720B2 (xx)
BE (1) BE813709A (xx)
BR (1) BR7402883D0 (xx)
CA (1) CA1030239A (xx)
FR (1) FR2225794B1 (xx)
GB (1) GB1446259A (xx)
IT (1) IT1011236B (xx)
NL (1) NL171388C (xx)
SE (1) SE404443B (xx)
ZA (1) ZA742303B (xx)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4017858A (en) * 1973-07-30 1977-04-12 Polhemus Navigation Sciences, Inc. Apparatus for generating a nutating electromagnetic field
US3990065A (en) * 1975-02-20 1976-11-02 The Magnavox Company Theft detection system
US4016553A (en) * 1975-06-27 1977-04-05 Knogo Corporation Article detection system with near field electromagnetic wave control
NL7702946A (nl) * 1976-04-03 1977-10-05 Bizerba Werke Kraut Kg Wilh Werkwijze en inrichting voor het vaststellen van de aanwezigheid van objecten in een bepaald controle- gebied, in het bijzonder voor het verhinderen van winkeldiefstallen.
US4118693A (en) * 1977-05-09 1978-10-03 Knogo Corporation Method and apparatus for producing uniform electromagnetic fields in an article detection system
US4135183A (en) * 1977-05-24 1979-01-16 Minnesota Mining And Manufacturing Company Antipilferage system utilizing "figure-8" shaped field producing and detector coils
JPS55121596A (en) * 1979-03-14 1980-09-18 Yoshida Kogyo Kk Device for protecting shoplifting and theft
US4274090A (en) * 1980-02-19 1981-06-16 Knogo Corporation Detection of articles in adjacent passageways
NL8200138A (nl) * 1982-01-14 1983-08-01 Nedap Nv Detectiestelsel.
WO1983003203A1 (en) * 1982-03-15 1983-09-29 Progressive Dynamics Method and apparatus for theft detection systems
US4737794A (en) * 1985-12-09 1988-04-12 Mcdonnell Douglas Corporation Method and apparatus for determining remote object orientation and position
US4742356A (en) * 1985-12-09 1988-05-03 Mcdonnell Douglas Corporation Method and apparatus for determining remote object orientation and position
US4798175A (en) * 1986-10-09 1989-01-17 Alfa-Laval Agri, Inc. Electronic identification system
FR2659173B1 (fr) * 1990-03-02 1992-09-18 Neiman Sa Antenne extra-plate a polarisation circulaire, notamment pour un ensemble de telecommande integre d'automobile.
GB9125846D0 (en) * 1991-12-04 1992-02-05 Esselte Meto Int Gmbh Improved interrogation and detection means for theft-detection systems
DE4200082A1 (de) * 1992-01-03 1993-07-08 Minnesota Mining & Mfg Vorrichtung und verfahren zum erkennen eines magnetisierbaren markierungselementes
US5646525A (en) * 1992-06-16 1997-07-08 Elbit Ltd. Three dimensional tracking system employing a rotating field
IL102218A (en) * 1992-06-16 2003-06-24 Elbit Systems Ltd Tracker employing a rotating electromagnetic field
CA2183697A1 (en) * 1995-08-23 1997-02-24 David P. Klaehn Electronic article-surveillance apparatus and method of operating same
US5877728A (en) * 1997-05-28 1999-03-02 Checkpoint Systems, Inc. Multiple loop antenna
DE19752506A1 (de) * 1997-11-27 1999-06-02 Meto International Gmbh System zur Sicherung von Artikeln gegen Diebstahl
US6069564A (en) * 1998-09-08 2000-05-30 Hatano; Richard Multi-directional RFID antenna
US6879300B2 (en) * 2000-02-08 2005-04-12 Cms Partners, Inc. Wireless boundary proximity determining and animal containment system and method
FR2828016B1 (fr) * 2001-07-30 2005-03-25 Pygmalyon Antennes du genre boucle
US6836216B2 (en) * 2002-05-09 2004-12-28 Electronic Article Surveillance Technologies, Ltd. Electronic article surveillance system
US20060279406A1 (en) * 2005-06-07 2006-12-14 Robert Stewart Synchronization and adaptive timing method for multiple RFID reader system

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE355807A (xx) * 1927-11-15
US1915786A (en) * 1929-03-02 1933-06-27 Jr John Hays Hammond System of transmission of radiant energy
FR763681A (fr) * 1933-11-10 1934-05-04 Procédé de repérage des objets par modification d'un champ magnétique
US2317071A (en) * 1938-12-30 1943-04-20 Rca Corp Antenna circuit modulation system
US2524760A (en) * 1947-08-28 1950-10-10 Walter J Brown Phase shift bridge
US3500373A (en) * 1966-05-06 1970-03-10 Nat Bank Of North America The Method and apparatus for article theft detection
GB1292380A (en) * 1969-04-02 1972-10-11 Unisearch Ltd Electronic surveillance systems
US3665449A (en) * 1969-07-11 1972-05-23 Minnesota Mining & Mfg Method and apparatus for detecting at a distance the status and identity of objects
US3676772A (en) * 1970-08-18 1972-07-11 Nasa Metallic intrusion detector system
US3740742A (en) * 1971-05-11 1973-06-19 T Thompson Method and apparatus for actuating an electric circuit
BE791039A (fr) * 1971-11-08 1973-05-07 Lewis Security Syst Ltd Systemes de securite
US3820104A (en) * 1972-12-15 1974-06-25 Stop Loss Inc Method and system for detecting an object within a magnetic field interrogation zone
US3938125A (en) * 1974-02-20 1976-02-10 Minnesota Mining And Manufacturing Company Antipilferage system and marker therefor

Also Published As

Publication number Publication date
IT1011236B (it) 1977-01-20
USRE29610E (en) 1978-04-11
FR2225794A1 (xx) 1974-11-08
GB1446259A (en) 1976-08-18
DE2417935B2 (de) 1977-03-17
BR7402883D0 (pt) 1974-12-31
JPS5028799A (xx) 1975-03-24
NL7404896A (xx) 1974-10-15
CA1030239A (en) 1978-04-25
NL171388C (nl) 1983-03-16
JPS5331720B2 (xx) 1978-09-04
DE2417935A1 (de) 1974-10-24
SE404443B (sv) 1978-10-02
US3838409A (en) 1974-09-24
NL171388B (nl) 1982-10-18
BE813709A (fr) 1974-10-14
AU6785574A (en) 1975-10-16
FR2225794B1 (xx) 1981-10-09

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