CA2049622C - Deactivatable electronic article surveillance tags, tag webs and method of making tag webs - Google Patents
Deactivatable electronic article surveillance tags, tag webs and method of making tag websInfo
- Publication number
- CA2049622C CA2049622C CA002049622A CA2049622A CA2049622C CA 2049622 C CA2049622 C CA 2049622C CA 002049622 A CA002049622 A CA 002049622A CA 2049622 A CA2049622 A CA 2049622A CA 2049622 C CA2049622 C CA 2049622C
- Authority
- CA
- Canada
- Prior art keywords
- fuse
- web
- resonant circuit
- conductive material
- energy level
- 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 - Fee Related
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
- G08B13/2405—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
- G08B13/2414—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 inductive tags
- G08B13/242—Tag deactivation
-
- 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
- G08B13/2428—Tag details
- G08B13/2437—Tag layered structure, processes for making layered tags
-
- 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
- G08B13/2428—Tag details
- G08B13/2437—Tag layered structure, processes for making layered tags
- G08B13/244—Tag manufacturing, e.g. continuous manufacturing processes
-
- 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
- G08B13/2428—Tag details
- G08B13/2437—Tag layered structure, processes for making layered tags
- G08B13/2442—Tag materials and material properties thereof, e.g. magnetic material details
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Computer Security & Cryptography (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Burglar Alarm Systems (AREA)
- Fuses (AREA)
Abstract
There is disclosed deactivatable electronic article surveillance tags, webs of such tags and method of making such tags. Each tag has a resonant circuit and utilizes a flexible fuse having a supporting film or web of plastics material, a thin coating of a conductive material such as silver to provide a destructible fuse member, and spaced connectors which join the fuse member to spaced-apart circuit portions of the resonant circuit.
Description
Docket I~~524 DF~eTavaaT~LE ELECTraoNIC ~T~cL~ Sv~v~zLLArac~
TAGS . TRIG WEBS AND METIiOD Ok' ~IdG T.AG WEBS
Field of the Invention The invention relates to the fi~ld of electronic article surveillance.
Backarround of the Invention United Staten patent 3,62,631 granted to ~iarc Chomet et al on November 30, 1971 discloses a tag with a fused deactivatable resonant circuit. United Staten patent 3,913,219 granted to Georga Jay Lichtblau on October 21, 1975 also discloses a fused deactivatable re$onant c3.rcu~.t.
Unitad Staten pat~snt ~, 535, 52~ c~rantad to Lea T. La~~rnd ~~t al on 3~ay 30, 1989 discloses a fused deac~tivatable resonant circuit with an accelerator that pxomotas fuse action. The Lamond et al patent points out that the prior art fusible link technic~ae requires a deactivating current which is so intena~ that the radio frequency signal needed to induce it can cause probleaaa in conforming to the regulations and requirements of the United Statpa Federal communications cammi$sion. This is due to the fact that the prior art approaches for making fused resonant circuits did not take Docket M-524 2 into account the special requirements of such resonant circuits.
Also made o:~ record is a PCT paten, application PCT/DIE85/00098 which was opened to public inspec-tian on 12 September 1986 in the name of Ma.~ R. Reeb; U.S. patent 3,631,442 granted to Robert E. Fearon on December 29, 1971;
U.S. patent 3,711,848 granted to Renry J. Martens on January 16, 19738 and U.S. patent 4,063,229 granted to John ~lelch et al on December 13, 1977.
Other examples of prior art fuses are disclosed in United States patent 4,208,645 granted to Thomas F. Harmon et al on June 17, 1980; United States patent 4,246,563 granted to Olav Noerholm on January 20, 1981 and United States patent 4,873,506 granted to Leon ~Gurevich on October 10, 1989.
Summary of the Invention The purpo8e of the invention is to pravide improved, low-cost, reliable, readily manufacturable tags for use in electronic article surveillance systems.
It is a feature of tine invention to provide a multilayer composite flexible fuse as part of a resonant circuit of a flexible tag for an electronic article surveillance system, so that the tag can conform to the article which the tag is required to protect.
It is another feature of the invention to provide an improv~d fus~ as part of a resonant circuit of a 'tag far an electranic ar~t:Lc~.e surveillance system, wherein ~t.he fuac~ :Ls of a construction which can bc~ reliably deacti,rated and yet the fuse does not subs~tantia~,ly or rnduly reduce th~ ~ of the resonant circuit.
It i8 aTlotYl~r featur8 of tile invention 'to provide an improved fuse as part of a resonant circuit of a tag for an electronic article surveillance syste~up wherein the fuse has low electrical resistance but is nevertheless quick to melt Docket M-~~24 3 or blow when the resonant circuit is sub~ec~ted to ~lec~trical energy at a predetermined level above the level at which the resonant circuit resonates.
Brief Description of the Drawir~gs FIGURE: 1 is an exploded perspective view of a 'tag in accordance with the invention, showing in particular a portion of fuse web;
FIGURR 2 is an enlarged exploded fragmentary view showing the zaanner in which circuit portions of the resonant circuit are connected through a fuse;
FIGURE 3 is atop plan view showing the manner in which one circuit portion is welded to the fuse web;
FIGURE 4 is a sectional diagrammatic view showing the various layers of the tag;
FIGURE 5 is an exploded fragmentary perspective view of a single web of resonant circuits shown with a pair of fuse webs;
FIGURE 6 is an exploded perspective view showing a plastics film with a coating thereon;
FIGURE 7 is a view similar to FIGURE S, but showing a "resist" as having been applied to the conductive coating;
FIGURE 8 is a perspective view of a wide composite fuse web being slit into narrow composite fuse webs;
FIGURE 9 is an enlarged perspective fxagmentary view showing the composite fuse web;
FIGURE 10 is a fragmentary perspective view showing th~a mann~r in which the fuse webs ara positioned relative to the resonant circuits during ~manufacturc~ thereof; and FIGURE 11 is a perspective view showing an alternative embodiment of fuse web in the foran of a composite thread.
Detailed Desari,~tion of the Preferred Fmbodiments p. specific embodiment of a tag T is .illustrated in FIGURE 1. The tag T is flexible so that it can conform to curved or other non-planar merchandise to which it is to be 2~~~~~~
Docket M-524 4 applied. Nevertheless, the resonant circuit FtC is not degraded by flexure, Although the expressian "tag,~ is used, this term is broad enough to include labels 3rahich are adhesively secured to merchandise, paper tags, which are hung on garments and the like by strings or plastic fasteners.
Tags T are useable in conjunction with an electronic article surveillance system of the type disclosed in co-owned U.S.
patent 4,812,822 granted to Johrs F. Feltz et al on March 14, 1989.
With reference to FIGURE 1, the tag T is identical to the tag illustrated in co-owned U.S. patent 4,846,922 granted to S. Eugene E~enge et al on July 11, 1989 and is manufactured according to the same method, except as to distinctions noted herein and shown in the accompanying drawings. The resonant circuit RC is shown to be comprised of two flexible circuit portions generally indicated at 20 and 21 connected to each other. The circuit portion 2Q includes a spiral conductor 22 having a plurality of turns and terminating at a connector member 23. The circuit p~x~t~.on 21 includes a spiral conductor 24 having a plurality of turns and terminating at a connector member 25. The spiral conductors 22 and 24 are in substantial registry or face-to-face relationship with respect to each other, except that the turns extend in opposite directions. The spiral conductors 2~ and 21 are connected to each other by a fuse web gen~arally indicated at FW joined to the connector members 23 and 25 ~to provide the resonant circuit R~. A sheet of dielectric material 26 is positioned between the spiral conductors 22 and 24, however, the d3eleetric matexial 26 terminates short of the connector members 23 and 25. It is seen that a piece of scrap 2?
exists in the plane of the circuit portion 20 and that a piece of scrap 27' exists in the plane of the circuit portion 21. The pieces of scrap 2? and 2?~ result from the cutting out of the circuit portions 2Q and 21 and do not form part of Docl~et M-52~! 5 the resonant circuit RC. A sheet or layer 29 of preferably opaque flexible material is adhesively adhered to the circuit portion 22 by pressure sensitive adhesive 3p. The sheet 29 protects the resonant circuit RC, shields it from view and is printable in a printer either before and/or after assembly of the tag T. adhesive 31 on both sides of the dielectric material 26 adheres the dielectric material 26 'to the circuit portions 20 and 21. A patterned coating of adhesive 32 exists on once surface of a sheet 33 of flexible material and a continuous coating of pressure sensitive adhesive 3~ exists on the opposite surface. The tag T can be adhered to an article to be protected by means of the adhesive 34. The sheet 33 comprises a carrier far the flexible resilient circuit RC. A sheet of flexible release-coated backing paper 35 is releasably adhered to the adhesive 34 on the sheet.
With reference to FIGURE 2, the connection between the connector members 23 and 25 through a fuse web FW is illustrated in greater detail than in FIGURE 1, The fuse web FW is shown to be disposed in a plane between the planes of the circuit portions 20 and 21. The fuse web .includes pairs of connectors 36. There is a fuss member 37 between each adjacent pair of connectors 36. The fuse web FW is spawn in greater detail in FIGURE 9. As shown, the fuse web FW is comprised of a web of flexible non-conductive plastics material 38 such as polyester film on which 'there is a thin coating 3~ of a conductive material such as silver. There is a relatively th.ic~s coating 40 of a conductive material such as copper appli~d to th~ coating 39. The portion of the coating 39 which bridges or connects adjacent but spaced--apart connectors 36 constitutes the fuse member 37.
With reference to FIGURE 2, a fuse F is considered to include a fuse member 37, one-half of both adjacent connectors 36 and the adjacent film 3~ with its coating 39.
As is evident from FIGURE 2, the fuse web FW includes a Docket M-524 6 plurality of fuses F. As shaven, the fuse members 37 occur at equally spaced-apart intervals longitudinally of the fuse web Fw. The distance between the center of one fuss member 37 and the center of the next fuse member 37 is considered to be the pitch P. The pitch P is preferably somawha~t less than the longitudinal distance between edge 40 of the connector member 23 and edge 41 of the connector member 25. Therefore, there is no need to register the fuse web FW with the connector members 23 and 25 t~ assure that one fuse member 37 registers with gap therebetween. However, if desired the - pitch h of the fuse members 37 could be arranged so that a single fuse member 37 is always positioned in 'the gap between edges 40 and 41.
As shown in FIGURE 2, the fuse web FW is connected to the connector member 23 by welding material 42 and the fuse web F67 is connected to the connector member 25 by welding material 42°. The welding material 42 is between the connector member 23 and the connector 36. However, the welding material 42' is adhered to the connector 36 and flows beyond the side edges of the fuse web Fw and is adhered to the connector member 25 as best shown in FIGURE 3, so a good electrical connection is achieved even though the plastics film 3S is positioned against the surface of the connector member 25. FIGURE 4 is a sectional view taken through th~
connectors 23 and Z5, but showing the fuse web FG1 in elevation. The welding material 42 and 42' can be the same as disclosed in United States patent 4,846,922, at columns 11 and 12.
FIGURE 5 shows a series of staggered circuit portions 2D
and 20a in one plane and a series of staggered circuit portions 21 and 21a in a different plane. Fuse webs FW and Fyd° are disposed between the circuit portions 20 and 21, and 20a and 21a, respectively. The fuse web F~7 is for the circuit portions 20 and 21 and the fuse web FW° is for the Docket M~524 7 circuit portions 2Qa and 21a. The staggered arrangement results from the method of manufacture disclosed in United States patent 4,846,922 by which the resonant circuit tags T
are made.
The fuse web FAT (and the fuse web FW°, according to the invention is made by starting out with a plastics film 33 coated with a thin coating of a conductive layer or material 39 such as silver. The layer 39 is shown exploded away from the film 38 in FIGURE 6.
FIGURE 7 is like FIGURE 6 except that the conductive - layer 39 is printed or coated with a pattern of equally spaced-apart lines of a '°resist'° 43. The film 38 with its layer 39 is then coated ~erith a relatively thick coating 4a of conductive material such as copper. The coating 40 is resisted by the resast 43 leaving parallel gaps 44 in the coating 40< The vaide composite fuse vaeb FW' thus formed is then slit into a series of narrow fuse webs F'fv~ by means of equally spaced-.apart knives 45.
Each gap 44 spaces apart adjacent connectors 36. That portion of the conductive material 39 which, connects or bridges the gap 44 betvaeen adjacent connectors 36 defines the fuse member 37.
~'TG'UR1~ 10 shaves a portion of the preferred process far making a double r~eb of fusdd deactivatable tags. The circuit portions 21 and 21a pass about a xoll 46 along with fuse webs F~ and Ffr7° . blebs with d3.elec~tric ~aaterial 26 and the circuit partiona 21 and 21a pass b~tv~een the nip of 'the coopera~t~Lng rolls 47 and 48. From there this combination passes about a call 49 which is eventually united with other circuit portioais in the wanner of United States patent 4,846,922.
An alternative fuse web ~1A is sharArta in F'TGURE 11. The fuse urel~ ~ has a central core of polyester plastics material 51 which has a continuous thin casting of a conductive material 52 such as silver over vahich there is a Docket I~-524 relatively thick coating 53 of a COnduCtive material such as copper. The fuse member 37A is formed by the conductive material 52 which bridges or connects adjacent connectors 36A. The fuse web ~'r7A is threadlike and is used in the same way as the fuse web ~1 is used.
It should be noted that the fuse member 37 (37A) has low electrical resistance and is relatively short. Low electrical resistance is important so that the Q of the circuit is not substantially or unduly affected. The lower the resistance, the smaller the reduction in the circuit Q.
Typical preferred total electrical resistance for the fuse member 37 (37A) is in the order of 0.2 Ohm and more preferably about 0.1 Ohm. . The fuse member 37 (37A) is preferably short, but not too short. A typical fuse member length is 0.003 inch (0.0?6 mm). The preferred range of fuse member length is between 0.002 inch (0.05 mm) and 0.004 inch (0.15 mm). The longer the fuse member 3? (37A), the higher the resistance. Tf the fuse member 3? (37A) is too short, heat will be dissipated to the connectors 36 (36A) when the excess energy is applied for deactivation. A typical desired time for the fuse member 37 (37A) to be destroyed, that is to meet or "blow" is in the ordex of 100 microseconds, although somewhat longer or shorter times are tolerable. The fuse member 3? (37A) is destroyed by melting andlor vaporizing when excess energy is applied to th~a resonant circuit, nam~aly by second ~nergy level signal which is of higher energy than a first enorgy level signal used 'to operate the resonant circuit.
It will be appreciated that oth~r coatings can be used for the fuse webs f"W, FW' and ~iA. ~'or example, the layer or coating 39 can be copper and the layer or coating 40 can be tine the layer 39 can be copper and the layer 40 can be ind~.um~ the layer 39 can b~ copper, and the layer 40 can be silver, and so on. The film 3~3 can be made of materials Docket M-52~ g othor than polyester, mylar for example. The coating 3~ is preferably less than 1000 Angstrom Units thick and even more preferably between 200 and 600 Angstrom Units thick. In one specific example, the coating 39 is X00 Angstroxr~ Units thick.
The coating 40 is substantially thicker than the coating 39 so that the connectors 36 can be welded to the connector members 23 and 25 without destroying the connectors 36 or any other part of the fuse F. A typical range of thickness for the coating or layer 40 is from 0.00005 inch (0.00127mmj to 0.0005 inch (0,0327~tunj The invention provides a readily manufacturable fused resonant circuit wherein the Q of the circuit is not substantially or unduly affected. The fuse F does effect certain degradation of the Q, for example a circuit without the fuse F can have a circuit Q between 50 and 60 and the fuse F can reduce the Q to about 35. Yet the resonant circuit RC is not substantially or unduly affected because it is still detectable in the interrogation gone of the electronic article surveillance syste~a by signals within the limits set by the Federal ~oamnunieation Coa~ission. The Q of the circuit is defined as Q ~ 2~ maximum energy star~dltotal energy lost per period.
Other embodiments and modifications of the invention will suggest the~aaelves to those skilled in the art, and all such of these as come within the spirit of this in~rention are included within its scope as best defined by the appended claims.
TAGS . TRIG WEBS AND METIiOD Ok' ~IdG T.AG WEBS
Field of the Invention The invention relates to the fi~ld of electronic article surveillance.
Backarround of the Invention United Staten patent 3,62,631 granted to ~iarc Chomet et al on November 30, 1971 discloses a tag with a fused deactivatable resonant circuit. United Staten patent 3,913,219 granted to Georga Jay Lichtblau on October 21, 1975 also discloses a fused deactivatable re$onant c3.rcu~.t.
Unitad Staten pat~snt ~, 535, 52~ c~rantad to Lea T. La~~rnd ~~t al on 3~ay 30, 1989 discloses a fused deac~tivatable resonant circuit with an accelerator that pxomotas fuse action. The Lamond et al patent points out that the prior art fusible link technic~ae requires a deactivating current which is so intena~ that the radio frequency signal needed to induce it can cause probleaaa in conforming to the regulations and requirements of the United Statpa Federal communications cammi$sion. This is due to the fact that the prior art approaches for making fused resonant circuits did not take Docket M-524 2 into account the special requirements of such resonant circuits.
Also made o:~ record is a PCT paten, application PCT/DIE85/00098 which was opened to public inspec-tian on 12 September 1986 in the name of Ma.~ R. Reeb; U.S. patent 3,631,442 granted to Robert E. Fearon on December 29, 1971;
U.S. patent 3,711,848 granted to Renry J. Martens on January 16, 19738 and U.S. patent 4,063,229 granted to John ~lelch et al on December 13, 1977.
Other examples of prior art fuses are disclosed in United States patent 4,208,645 granted to Thomas F. Harmon et al on June 17, 1980; United States patent 4,246,563 granted to Olav Noerholm on January 20, 1981 and United States patent 4,873,506 granted to Leon ~Gurevich on October 10, 1989.
Summary of the Invention The purpo8e of the invention is to pravide improved, low-cost, reliable, readily manufacturable tags for use in electronic article surveillance systems.
It is a feature of tine invention to provide a multilayer composite flexible fuse as part of a resonant circuit of a flexible tag for an electronic article surveillance system, so that the tag can conform to the article which the tag is required to protect.
It is another feature of the invention to provide an improv~d fus~ as part of a resonant circuit of a 'tag far an electranic ar~t:Lc~.e surveillance system, wherein ~t.he fuac~ :Ls of a construction which can bc~ reliably deacti,rated and yet the fuse does not subs~tantia~,ly or rnduly reduce th~ ~ of the resonant circuit.
It i8 aTlotYl~r featur8 of tile invention 'to provide an improved fuse as part of a resonant circuit of a tag for an electronic article surveillance syste~up wherein the fuse has low electrical resistance but is nevertheless quick to melt Docket M-~~24 3 or blow when the resonant circuit is sub~ec~ted to ~lec~trical energy at a predetermined level above the level at which the resonant circuit resonates.
Brief Description of the Drawir~gs FIGURE: 1 is an exploded perspective view of a 'tag in accordance with the invention, showing in particular a portion of fuse web;
FIGURR 2 is an enlarged exploded fragmentary view showing the zaanner in which circuit portions of the resonant circuit are connected through a fuse;
FIGURE 3 is atop plan view showing the manner in which one circuit portion is welded to the fuse web;
FIGURE 4 is a sectional diagrammatic view showing the various layers of the tag;
FIGURE 5 is an exploded fragmentary perspective view of a single web of resonant circuits shown with a pair of fuse webs;
FIGURE 6 is an exploded perspective view showing a plastics film with a coating thereon;
FIGURE 7 is a view similar to FIGURE S, but showing a "resist" as having been applied to the conductive coating;
FIGURE 8 is a perspective view of a wide composite fuse web being slit into narrow composite fuse webs;
FIGURE 9 is an enlarged perspective fxagmentary view showing the composite fuse web;
FIGURE 10 is a fragmentary perspective view showing th~a mann~r in which the fuse webs ara positioned relative to the resonant circuits during ~manufacturc~ thereof; and FIGURE 11 is a perspective view showing an alternative embodiment of fuse web in the foran of a composite thread.
Detailed Desari,~tion of the Preferred Fmbodiments p. specific embodiment of a tag T is .illustrated in FIGURE 1. The tag T is flexible so that it can conform to curved or other non-planar merchandise to which it is to be 2~~~~~~
Docket M-524 4 applied. Nevertheless, the resonant circuit FtC is not degraded by flexure, Although the expressian "tag,~ is used, this term is broad enough to include labels 3rahich are adhesively secured to merchandise, paper tags, which are hung on garments and the like by strings or plastic fasteners.
Tags T are useable in conjunction with an electronic article surveillance system of the type disclosed in co-owned U.S.
patent 4,812,822 granted to Johrs F. Feltz et al on March 14, 1989.
With reference to FIGURE 1, the tag T is identical to the tag illustrated in co-owned U.S. patent 4,846,922 granted to S. Eugene E~enge et al on July 11, 1989 and is manufactured according to the same method, except as to distinctions noted herein and shown in the accompanying drawings. The resonant circuit RC is shown to be comprised of two flexible circuit portions generally indicated at 20 and 21 connected to each other. The circuit portion 2Q includes a spiral conductor 22 having a plurality of turns and terminating at a connector member 23. The circuit p~x~t~.on 21 includes a spiral conductor 24 having a plurality of turns and terminating at a connector member 25. The spiral conductors 22 and 24 are in substantial registry or face-to-face relationship with respect to each other, except that the turns extend in opposite directions. The spiral conductors 2~ and 21 are connected to each other by a fuse web gen~arally indicated at FW joined to the connector members 23 and 25 ~to provide the resonant circuit R~. A sheet of dielectric material 26 is positioned between the spiral conductors 22 and 24, however, the d3eleetric matexial 26 terminates short of the connector members 23 and 25. It is seen that a piece of scrap 2?
exists in the plane of the circuit portion 20 and that a piece of scrap 27' exists in the plane of the circuit portion 21. The pieces of scrap 2? and 2?~ result from the cutting out of the circuit portions 2Q and 21 and do not form part of Docl~et M-52~! 5 the resonant circuit RC. A sheet or layer 29 of preferably opaque flexible material is adhesively adhered to the circuit portion 22 by pressure sensitive adhesive 3p. The sheet 29 protects the resonant circuit RC, shields it from view and is printable in a printer either before and/or after assembly of the tag T. adhesive 31 on both sides of the dielectric material 26 adheres the dielectric material 26 'to the circuit portions 20 and 21. A patterned coating of adhesive 32 exists on once surface of a sheet 33 of flexible material and a continuous coating of pressure sensitive adhesive 3~ exists on the opposite surface. The tag T can be adhered to an article to be protected by means of the adhesive 34. The sheet 33 comprises a carrier far the flexible resilient circuit RC. A sheet of flexible release-coated backing paper 35 is releasably adhered to the adhesive 34 on the sheet.
With reference to FIGURE 2, the connection between the connector members 23 and 25 through a fuse web FW is illustrated in greater detail than in FIGURE 1, The fuse web FW is shown to be disposed in a plane between the planes of the circuit portions 20 and 21. The fuse web .includes pairs of connectors 36. There is a fuss member 37 between each adjacent pair of connectors 36. The fuse web FW is spawn in greater detail in FIGURE 9. As shown, the fuse web FW is comprised of a web of flexible non-conductive plastics material 38 such as polyester film on which 'there is a thin coating 3~ of a conductive material such as silver. There is a relatively th.ic~s coating 40 of a conductive material such as copper appli~d to th~ coating 39. The portion of the coating 39 which bridges or connects adjacent but spaced--apart connectors 36 constitutes the fuse member 37.
With reference to FIGURE 2, a fuse F is considered to include a fuse member 37, one-half of both adjacent connectors 36 and the adjacent film 3~ with its coating 39.
As is evident from FIGURE 2, the fuse web FW includes a Docket M-524 6 plurality of fuses F. As shaven, the fuse members 37 occur at equally spaced-apart intervals longitudinally of the fuse web Fw. The distance between the center of one fuss member 37 and the center of the next fuse member 37 is considered to be the pitch P. The pitch P is preferably somawha~t less than the longitudinal distance between edge 40 of the connector member 23 and edge 41 of the connector member 25. Therefore, there is no need to register the fuse web FW with the connector members 23 and 25 t~ assure that one fuse member 37 registers with gap therebetween. However, if desired the - pitch h of the fuse members 37 could be arranged so that a single fuse member 37 is always positioned in 'the gap between edges 40 and 41.
As shown in FIGURE 2, the fuse web FW is connected to the connector member 23 by welding material 42 and the fuse web F67 is connected to the connector member 25 by welding material 42°. The welding material 42 is between the connector member 23 and the connector 36. However, the welding material 42' is adhered to the connector 36 and flows beyond the side edges of the fuse web Fw and is adhered to the connector member 25 as best shown in FIGURE 3, so a good electrical connection is achieved even though the plastics film 3S is positioned against the surface of the connector member 25. FIGURE 4 is a sectional view taken through th~
connectors 23 and Z5, but showing the fuse web FG1 in elevation. The welding material 42 and 42' can be the same as disclosed in United States patent 4,846,922, at columns 11 and 12.
FIGURE 5 shows a series of staggered circuit portions 2D
and 20a in one plane and a series of staggered circuit portions 21 and 21a in a different plane. Fuse webs FW and Fyd° are disposed between the circuit portions 20 and 21, and 20a and 21a, respectively. The fuse web F~7 is for the circuit portions 20 and 21 and the fuse web FW° is for the Docket M~524 7 circuit portions 2Qa and 21a. The staggered arrangement results from the method of manufacture disclosed in United States patent 4,846,922 by which the resonant circuit tags T
are made.
The fuse web FAT (and the fuse web FW°, according to the invention is made by starting out with a plastics film 33 coated with a thin coating of a conductive layer or material 39 such as silver. The layer 39 is shown exploded away from the film 38 in FIGURE 6.
FIGURE 7 is like FIGURE 6 except that the conductive - layer 39 is printed or coated with a pattern of equally spaced-apart lines of a '°resist'° 43. The film 38 with its layer 39 is then coated ~erith a relatively thick coating 4a of conductive material such as copper. The coating 40 is resisted by the resast 43 leaving parallel gaps 44 in the coating 40< The vaide composite fuse vaeb FW' thus formed is then slit into a series of narrow fuse webs F'fv~ by means of equally spaced-.apart knives 45.
Each gap 44 spaces apart adjacent connectors 36. That portion of the conductive material 39 which, connects or bridges the gap 44 betvaeen adjacent connectors 36 defines the fuse member 37.
~'TG'UR1~ 10 shaves a portion of the preferred process far making a double r~eb of fusdd deactivatable tags. The circuit portions 21 and 21a pass about a xoll 46 along with fuse webs F~ and Ffr7° . blebs with d3.elec~tric ~aaterial 26 and the circuit partiona 21 and 21a pass b~tv~een the nip of 'the coopera~t~Lng rolls 47 and 48. From there this combination passes about a call 49 which is eventually united with other circuit portioais in the wanner of United States patent 4,846,922.
An alternative fuse web ~1A is sharArta in F'TGURE 11. The fuse urel~ ~ has a central core of polyester plastics material 51 which has a continuous thin casting of a conductive material 52 such as silver over vahich there is a Docket I~-524 relatively thick coating 53 of a COnduCtive material such as copper. The fuse member 37A is formed by the conductive material 52 which bridges or connects adjacent connectors 36A. The fuse web ~'r7A is threadlike and is used in the same way as the fuse web ~1 is used.
It should be noted that the fuse member 37 (37A) has low electrical resistance and is relatively short. Low electrical resistance is important so that the Q of the circuit is not substantially or unduly affected. The lower the resistance, the smaller the reduction in the circuit Q.
Typical preferred total electrical resistance for the fuse member 37 (37A) is in the order of 0.2 Ohm and more preferably about 0.1 Ohm. . The fuse member 37 (37A) is preferably short, but not too short. A typical fuse member length is 0.003 inch (0.0?6 mm). The preferred range of fuse member length is between 0.002 inch (0.05 mm) and 0.004 inch (0.15 mm). The longer the fuse member 3? (37A), the higher the resistance. Tf the fuse member 3? (37A) is too short, heat will be dissipated to the connectors 36 (36A) when the excess energy is applied for deactivation. A typical desired time for the fuse member 37 (37A) to be destroyed, that is to meet or "blow" is in the ordex of 100 microseconds, although somewhat longer or shorter times are tolerable. The fuse member 3? (37A) is destroyed by melting andlor vaporizing when excess energy is applied to th~a resonant circuit, nam~aly by second ~nergy level signal which is of higher energy than a first enorgy level signal used 'to operate the resonant circuit.
It will be appreciated that oth~r coatings can be used for the fuse webs f"W, FW' and ~iA. ~'or example, the layer or coating 39 can be copper and the layer or coating 40 can be tine the layer 39 can be copper and the layer 40 can be ind~.um~ the layer 39 can b~ copper, and the layer 40 can be silver, and so on. The film 3~3 can be made of materials Docket M-52~ g othor than polyester, mylar for example. The coating 3~ is preferably less than 1000 Angstrom Units thick and even more preferably between 200 and 600 Angstrom Units thick. In one specific example, the coating 39 is X00 Angstroxr~ Units thick.
The coating 40 is substantially thicker than the coating 39 so that the connectors 36 can be welded to the connector members 23 and 25 without destroying the connectors 36 or any other part of the fuse F. A typical range of thickness for the coating or layer 40 is from 0.00005 inch (0.00127mmj to 0.0005 inch (0,0327~tunj The invention provides a readily manufacturable fused resonant circuit wherein the Q of the circuit is not substantially or unduly affected. The fuse F does effect certain degradation of the Q, for example a circuit without the fuse F can have a circuit Q between 50 and 60 and the fuse F can reduce the Q to about 35. Yet the resonant circuit RC is not substantially or unduly affected because it is still detectable in the interrogation gone of the electronic article surveillance syste~a by signals within the limits set by the Federal ~oamnunieation Coa~ission. The Q of the circuit is defined as Q ~ 2~ maximum energy star~dltotal energy lost per period.
Other embodiments and modifications of the invention will suggest the~aaelves to those skilled in the art, and all such of these as come within the spirit of this in~rention are included within its scope as best defined by the appended claims.
Claims (17)
1. A flexible deactivatable tag for use in an electronic article surveillance system, the tag comprising:
a flexible carrier, a flexible resonant circuit on the carrier and. responsive to receipt of a first energy level signal to emit an alarm signal to indicate the presence of the resonant circuit in an interrogation zone, wherein the resonant circuit includes two circuit portions, a flexible fuse including a film of non-conductive plastics material, a coating of conductive material on the film and spaced-apart connectors on the conductive material, wherein the conductive material which connects adjacent connectors constitutes a fuse member, wherein the fuse member is responsive to a second energy level signal at an energy level higher than the first energy Ievel signal to cause deactivation of the resonant circuit, and means for electrically connecting the circuit portions through the fuse.
a flexible carrier, a flexible resonant circuit on the carrier and. responsive to receipt of a first energy level signal to emit an alarm signal to indicate the presence of the resonant circuit in an interrogation zone, wherein the resonant circuit includes two circuit portions, a flexible fuse including a film of non-conductive plastics material, a coating of conductive material on the film and spaced-apart connectors on the conductive material, wherein the conductive material which connects adjacent connectors constitutes a fuse member, wherein the fuse member is responsive to a second energy level signal at an energy level higher than the first energy Ievel signal to cause deactivation of the resonant circuit, and means for electrically connecting the circuit portions through the fuse.
2. The tag defined in claim 1, wherein the fuse member is less than 1000 Angstrom Units thick.
3. A flexible deactivatable tag for use in an electronic article surveillance system, the tag comprising:
a flexible carrier, a flexible resonant circuit on the carrier and responsive to receipt of a first energy level signal to emit an alarm signal to indicate the presence of the resonant circuit in an interrogation zone, wherein the resonant circuit includes two circuit portions, a flexible fuse including a film of non-conductive plastics material, a coating of conductive material on the film and spaced-apart connectors on the conductive material, wherein the conductive material which connects adjacent connectors constitutes a fuse member, wherein the fuse member is responsive to a second energy level signal at an energy level higher than the first energy level signal to cause deactivation of the resonant circuit, wherein the fuse member has an electrical resistance of less than 0.3 Ohms and is relatively short to prevent substantial reduction in the Q of the resonant circuit from being substantially or unduly affected, and means for electrically connecting the circuit portions through the fuse.
a flexible carrier, a flexible resonant circuit on the carrier and responsive to receipt of a first energy level signal to emit an alarm signal to indicate the presence of the resonant circuit in an interrogation zone, wherein the resonant circuit includes two circuit portions, a flexible fuse including a film of non-conductive plastics material, a coating of conductive material on the film and spaced-apart connectors on the conductive material, wherein the conductive material which connects adjacent connectors constitutes a fuse member, wherein the fuse member is responsive to a second energy level signal at an energy level higher than the first energy level signal to cause deactivation of the resonant circuit, wherein the fuse member has an electrical resistance of less than 0.3 Ohms and is relatively short to prevent substantial reduction in the Q of the resonant circuit from being substantially or unduly affected, and means for electrically connecting the circuit portions through the fuse.
4. The tag defined in claim 3, wherein the fuse member is less than 1000 angstrom Units thick.
5. A flexible deactivatable tag for use in an electronic article surveillance system, the tag comprising:
a flexible carrier, a flexible resonant circuit on the carrier and responsive to receipt of a first energy level signal to emit an alarm signal to indicate the presence of the resonant circuit in an interrogation zone, wherein the resonant circuit includes two circuit portions, a flexible fuse including a film of non-conductive plastics material, a coating of conductive material on the film and spaced-apart connectors on the conductive material, wherein the conductive material which connects adjacent connectors constitutes a fuse member, wherein the fuse member is responsive to a second energy level signal at an energy level higher than the first energy level signal to cause deactivation of the resonant circuit, and wherein the fuse member is of low electrical resistance and is less than 0.005 inch long.
a flexible carrier, a flexible resonant circuit on the carrier and responsive to receipt of a first energy level signal to emit an alarm signal to indicate the presence of the resonant circuit in an interrogation zone, wherein the resonant circuit includes two circuit portions, a flexible fuse including a film of non-conductive plastics material, a coating of conductive material on the film and spaced-apart connectors on the conductive material, wherein the conductive material which connects adjacent connectors constitutes a fuse member, wherein the fuse member is responsive to a second energy level signal at an energy level higher than the first energy level signal to cause deactivation of the resonant circuit, and wherein the fuse member is of low electrical resistance and is less than 0.005 inch long.
6. The tag defined in claim 5, wherein the fuse member is less than 1000 angstrom Units thick.
7. The tag defined in claim 5, wherein the conductive material comprises silver.
8. The tag defined in claim 5, wherein the connectors comprise one of copper and silver.
9. The tag defined in claim 5, wherein the conductive material comprises silver and the connectors comprise one of silver and copper.
10. The tag defined in claim 5, wherein the conductive material is comprised of silver, the connectors are comprised of copper, and the length of the fuse member is between 0.002 inch and 0.004 inch.
11. The tag defined in claim 1, wherein the thickness of the conductive material is between 200 and 600 Angstrom Units.
12. A flexible deactivatable tag for use in an electronic article surveillance system, the tag comprising:
a flexible carrier, a flexible resonant circuit on the carrier and responsive to receipt of a first energy level signal to emit an alarm signal to indicate the presence of the resonant circuit in an interrogation zone, wherein the resonant circuit includes two circuit portions, a flexible fuse including a film of non-conductive plastics material, a coating of conductive material on the film and spaced apart conductors on the conductive material, wherein the conductive material which connects adjacent conductors constitutes a fuse member, wherein the fuse member is responsive to a second energy level signal at an energy level higher than the first energy level signal to cause deactivation of the resonant circuit, wherein the circuit portions are disposed in spaced planes, each circuit portion having a connector member, wherein the fuse member is disposed in a plane between the planes of the circuit portions, wherein one conductor is in face-to-face disposition with respect to one connector member and the plastic film is in face-to-face disposition with respect to the other connector member, and means for electrically connecting the connectors to the connector members so that the resonant circuit is made through the fuse member.
a flexible carrier, a flexible resonant circuit on the carrier and responsive to receipt of a first energy level signal to emit an alarm signal to indicate the presence of the resonant circuit in an interrogation zone, wherein the resonant circuit includes two circuit portions, a flexible fuse including a film of non-conductive plastics material, a coating of conductive material on the film and spaced apart conductors on the conductive material, wherein the conductive material which connects adjacent conductors constitutes a fuse member, wherein the fuse member is responsive to a second energy level signal at an energy level higher than the first energy level signal to cause deactivation of the resonant circuit, wherein the circuit portions are disposed in spaced planes, each circuit portion having a connector member, wherein the fuse member is disposed in a plane between the planes of the circuit portions, wherein one conductor is in face-to-face disposition with respect to one connector member and the plastic film is in face-to-face disposition with respect to the other connector member, and means for electrically connecting the connectors to the connector members so that the resonant circuit is made through the fuse member.
13. The tag defined in claim 12, wherein the electrical connecting means includes welding material which bridges the other connector with the other connector member.
14. A web of flexible deactivatable tags, the tags being for use in an electronic article surveillance system, comprising: a flexible tag web, having a series of spaced flexible resonant circuits, each of said resonant circuits being responsive to receipt of a first energy level signal to indicate the presence of the resonant circuit in an interrogation zone, each resonant circuit including two spaced-apart circuit portions, a flexible supporting web composed of non-conductive plastics material, a coating of conductive material on the supporting web and a series of longitudinally spaced conductive connectors joined to the conductive material, wherein the conductive material which connects each adjacent pair of conductors constitutes a fuse member, wherein each fuse member is responsive to a second energy level signal at an energy level higher than the first energy level signal to cause deactivation of the resonant circuit, wherein the supporting web, the conductive material and the spaced connectors constitute a flexible fuse web having the fuse members spaced therealong, the fuse web being positioned adjacent the resonant circuits and between the circuit portions of each circuit, and means for electrically connecting the circuit portions of each resonant circuit through connectors and an intervening fuse member of the fuse web.
15. A web of flexible deactivatable tags, the tags being for use in an electronic article surveillance system, comprising: a flexible tag web including a series of spaced flexible resonant circuits, each of said resonant circuits being responsive to receipt of a first energy level signal to indicate the presence of the resonant circuit in an interrogation zone, each resonant circuit including two spaced-apart circuit portions, a flexible supporting web composed of non-conductive plastics material, a casting of conductive material on the supporting web and a series of longitudinally spaced conductive connectors joined to the conductive material, wherein the conductive material which connects each adjacent pair of conductors constitutes a fuse member, wherein each fuse member is responsive to a second energy level signal at an energy level higher than the first energy level signal to cause deactivation of the resonant circuit, wherein the supporting web, the conductive material and the spaced connectors constitute a flexible fuse web having the fuse members spaced therealong, the fuse web being randomly positioned adjacent the resonant circuits and between the circuit portions of each circuit, wherein the pitch of the fuse members is less than the space between the circuit portions of any resonant circuit, and means for electrically connecting the circuit portions of each resonant circuit through adjacent connectors and an intervening fuse member of the fuse web.
16. Method of making deactivatable tags for use in an electronic article surveillance system, comprising the steps of: providing a tag web having a series of spaced resonant circuits with each resonant circuit being responsive to receipt of a first energy level signal, to emit an alarm signal to indicate the presence of the resonant circuit in an interrogation zone, the tag web being detachable between adjacent resonant circuits to provide a plurality of tags, each resonant circuit including two spaced-apart circuit portions, providing a flexible web composed of plastics material and having a coating of conductive material and a series of spaced connectors coated onto the conductive material along the length of the web, wherein the conductive material which connects each adjacent pair of connectors constitutes a fuse member responsive to a second energy level signal at an energy level higher than the first energy level signal to cause deactivation of the resonant circuit, wherein the supporting web, the conductive material and the spaced connectors constitute a fuse web having the fuse members spaced therealong, randomly positioning the fuse web adjacent the resonant circuits and between the circuit portions of each circuit, wherein the pitch of the fuse members is less than the space between the circuit portions of any resonant circuit, and connecting the circuit portions of each resonant circuit through connectors and an intervening fuse member of the fuse web.
17. Method of making deactivatable tags for use in an electronic article surveillance system, comprising the steps of: providing a tag web having a series of spaced resonant circuits with each resonant circuit being responsive to receipt of a first energy level signal to emit an alarm signal to indicate the presence of the resonant circuit in an interrogation zone, the tag web being detachable between adjacent resonant circuits to provide a plurality of tags, each resonant circuit including two spaced-apart circuit portions, providing a flexible web composed of plastics material and having a coating of conductive material and a series of spaced connectors coated onto the conductive material along the length of the web, wherein the conductive material which connects each adjacent pair of connectors constitutes a fuse member responsive to a second energy level signal at an energy level higher than the first energy level signal to cause deactivation of the resonant circuit, wherein the supporting web, the conductive material, and the spaced connectors constitute a fuse web having the fuse members spaced therealong, positioning the fuse web adjacent the resonant circuits and between the circuit portions of each circuit, and connecting the circuit portions of each resonant circuit through connectors and an intervening fuse member of the fuse web.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US577,228 | 1990-09-04 | ||
| US07/577,228 US5059950A (en) | 1990-09-04 | 1990-09-04 | Deactivatable electronic article surveillance tags, tag webs and method of making tag webs |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2049622A1 CA2049622A1 (en) | 1992-03-05 |
| CA2049622C true CA2049622C (en) | 1999-10-12 |
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ID=24307819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002049622A Expired - Fee Related CA2049622C (en) | 1990-09-04 | 1991-08-21 | Deactivatable electronic article surveillance tags, tag webs and method of making tag webs |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5059950A (en) |
| JP (1) | JP3167364B2 (en) |
| CA (1) | CA2049622C (en) |
| DE (1) | DE4129446C2 (en) |
| FR (1) | FR2666433B1 (en) |
| GB (1) | GB2248367B (en) |
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| ATE440480T1 (en) * | 1993-12-30 | 2009-09-15 | Miyake Kk | COMPOSITE FILM WITH CIRCUIT-SHAPED METAL FOIL OR THE LIKE AND METHOD FOR PRODUCING IT |
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| US5751256A (en) * | 1994-03-04 | 1998-05-12 | Flexcon Company Inc. | Resonant tag labels and method of making same |
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-
1990
- 1990-09-04 US US07/577,228 patent/US5059950A/en not_active Expired - Lifetime
-
1991
- 1991-08-09 GB GB9117249A patent/GB2248367B/en not_active Expired - Fee Related
- 1991-08-21 CA CA002049622A patent/CA2049622C/en not_active Expired - Fee Related
- 1991-09-02 FR FR9110833A patent/FR2666433B1/en not_active Expired - Fee Related
- 1991-09-02 JP JP22147691A patent/JP3167364B2/en not_active Expired - Fee Related
- 1991-09-04 DE DE4129446A patent/DE4129446C2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2049622A1 (en) | 1992-03-05 |
| US5059950A (en) | 1991-10-22 |
| JP3167364B2 (en) | 2001-05-21 |
| JPH04245597A (en) | 1992-09-02 |
| DE4129446C2 (en) | 2002-12-05 |
| GB9117249D0 (en) | 1991-09-25 |
| GB2248367A (en) | 1992-04-01 |
| DE4129446A1 (en) | 1992-03-05 |
| FR2666433B1 (en) | 1994-10-28 |
| FR2666433A1 (en) | 1992-03-06 |
| GB2248367B (en) | 1994-03-30 |
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Legal Events
| Date | Code | Title | Description |
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| EEER | Examination request | ||
| MKLA | Lapsed |