CA1030239A - Field strength uniformity control system - Google Patents
Field strength uniformity control systemInfo
- Publication number
- CA1030239A CA1030239A CA196,851A CA196851A CA1030239A CA 1030239 A CA1030239 A CA 1030239A CA 196851 A CA196851 A CA 196851A CA 1030239 A CA1030239 A CA 1030239A
- Authority
- CA
- Canada
- Prior art keywords
- control system
- field strength
- uniformity control
- strength uniformity
- field
- 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
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)
- Signal Processing (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Computer Security & Cryptography (AREA)
- Burglar Alarm Systems (AREA)
- Geophysics And Detection Of Objects (AREA)
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 |
---|---|
CA1030239A true CA1030239A (en) | 1978-04-25 |
Family
ID=23379238
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA196,851A Expired CA1030239A (en) | 1973-04-13 | 1974-04-04 | Field strength uniformity control system |
Country Status (11)
Country | Link |
---|---|
US (2) | US3838409A (sv) |
JP (1) | JPS5331720B2 (sv) |
BE (1) | BE813709A (sv) |
BR (1) | BR7402883D0 (sv) |
CA (1) | CA1030239A (sv) |
FR (1) | FR2225794B1 (sv) |
GB (1) | GB1446259A (sv) |
IT (1) | IT1011236B (sv) |
NL (1) | NL171388C (sv) |
SE (1) | SE404443B (sv) |
ZA (1) | ZA742303B (sv) |
Families Citing this family (26)
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. |
DE3380326D1 (en) * | 1982-03-15 | 1989-09-07 | 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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE355807A (sv) * | 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 |
-
1973
- 1973-04-13 US US00351018A patent/US3838409A/en not_active Expired - Lifetime
-
1974
- 1974-04-04 CA CA196,851A patent/CA1030239A/en not_active Expired
- 1974-04-09 GB GB1568474A patent/GB1446259A/en not_active Expired
- 1974-04-10 ZA ZA00742303A patent/ZA742303B/xx unknown
- 1974-04-10 NL NLAANVRAGE7404896,A patent/NL171388C/xx not_active IP Right Cessation
- 1974-04-10 BR BR2883/74A patent/BR7402883D0/pt unknown
- 1974-04-10 JP JP4045074A patent/JPS5331720B2/ja not_active Expired
- 1974-04-10 SE SE7404938A patent/SE404443B/sv unknown
- 1974-04-11 FR FR7412854A patent/FR2225794B1/fr not_active Expired
- 1974-04-11 IT IT50319/74A patent/IT1011236B/it active
- 1974-04-12 BE BE143199A patent/BE813709A/xx not_active IP Right Cessation
-
1975
- 1975-05-07 US US05/575,153 patent/USRE29610E/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
NL7404896A (sv) | 1974-10-15 |
ZA742303B (en) | 1975-03-26 |
JPS5331720B2 (sv) | 1978-09-04 |
NL171388B (nl) | 1982-10-18 |
DE2417935A1 (de) | 1974-10-24 |
FR2225794A1 (sv) | 1974-11-08 |
SE404443B (sv) | 1978-10-02 |
DE2417935B2 (de) | 1977-03-17 |
NL171388C (nl) | 1983-03-16 |
BE813709A (fr) | 1974-10-14 |
GB1446259A (en) | 1976-08-18 |
BR7402883D0 (pt) | 1974-12-31 |
AU6785574A (en) | 1975-10-16 |
IT1011236B (it) | 1977-01-20 |
US3838409A (en) | 1974-09-24 |
FR2225794B1 (sv) | 1981-10-09 |
USRE29610E (en) | 1978-04-11 |
JPS5028799A (sv) | 1975-03-24 |
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