EP0703552A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Apparatus for deactivation of electronic article surveillance tags
Assignee: Sensormatic Electronics Corp
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Filing: 1995-07-04
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Granted: —
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Expires: 2015-07-04
Abstract
Abstract A deactivation device for deactivating electronic article surveillance tags comprises a housing, a coil supported in the housing and having opposed first and second sides and energizable to generate a magnetic field issuing from both the first and second sides thereof and a shielding unit supported in the housing in juxtaposition with the coil second side. The shielding unit includes a succession of magnetically permeable members and lessens magnetic fields exteriorly of a portion of the housing juxtaposed with the last of magnetically permeable members in the succession and otherwise functions as a pole piece for the coil and enhances the magnetic field generated by the coil. Plural coil pairs may be provided in the housing about an interior compartment receiving tagged articles and each coil pair provided with the shielding unit.
Inventors
- 👤 Joerg W. Zschirnt
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 06:34
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/22; G08B13/24; G08B13/2402; G08B13/2405; G08B13/2408; G08B13/2411
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
93 words
A deactivation device for inactivating electronic article surveillance tags, comprising: (a) a housing; (b) a coil supported in said housing and having opposed first and second sides and energizable to generate a magnetic field issuing from both said first and second sides thereof; and (c) a shielding unit supported in said housing in juxtaposition with said coil second side, said shielding unit comprising a succession of magnetically permeable members, said shielding unit lessening magnetic fields exteriorly of a portion of said housing juxtaposed with the last of magnetically permeable members in said succession.
Claim 2
Dependent Claim
17 words
The deactivation device claimed in claim 1, wherein said magnetically permeable members are comprised of magnetic steel.
Claim 3
Dependent Claim
17 words
The deactivation device claimed in claim 2, wherein said magnetically permeable members are comprised of silicon iron.
Claim 4
Dependent Claim
14 words
The deactivation device claimed in claim 2, wherein said magnetically permeable members are annealed.
Claim 5
Dependent Claim
21 words
The deactivation device claimed in claim 1, wherein said shielding unit further includes adhesive means disposed between said magnetically permeable members.
Claim 6
Dependent Claim
17 words
The deactivation device claimed in claim 5, wherein said magnetically permeable members are comprised of silicon iron.
Claim 7
Dependent Claim
14 words
The deactivation device claimed in claim 6, wherein said magnetically permeable members are annealed.
Claim 8
Dependent Claim
110 words
A deactivation device for inactivating electronic article surveillance tags, comprising: (a) a housing; (b) at least first and second pairs of coils supported in said housing each coil having opposed first and second sides and energizable to generate respective first and second magnetic fields issuing from both said first and second sides of said coils; and (c) shielding units supported in said housing respectively in juxtaposition with said second sides of said coils, each said shielding unit comprising a succession of magnetically permeable members, each said shielding unit lessening magnetic fields exteriorly of respective portions of said housing juxtaposed with the last of magnetically permeable members in said respective successions.
Claim 9
Dependent Claim
17 words
The deactivation device claimed in claim 8, wherein said magnetically permeable members are comprised of silicon iron.
Claim 10
Dependent Claim
14 words
The deactivation device claimed in claim 9, wherein said magnetically permeable members are annealed.
Claim 11
Dependent Claim
37 words
The deactivation device claimed in claim 8, wherein each said shielding unit further includes a support member and wherein said magnetically permeable members are stacked on said support member and are mechanically secured to said support member.
Claim 12
Dependent Claim
17 words
The deactivation device claimed in claim 11, wherein said magnetically permeable members are comprised of silicon iron.
Claim 13
Dependent Claim
14 words
The deactivation device claimed in claim 12, wherein said magnetically permeable members are annealed.
Claim 14
Dependent Claim
132 words
A deactivation device for inactivating electronic article surveillance tags, comprising: (a) a housing defining a compartment accessible exteriorly of said housing for temporary containment of an article bearing an electronic article surveillance tag; (b) first and second coil pairs supported in said housing each coil having opposed first and second sides and energizable to generate respective first and second magnetic fields issuing from both said first and second sides of said coils; and (c) first and second shielding units supported in said housing in juxtaposition with said second sides of said respective first and second coils, each said shielding unit comprising a succession of magnetically permeable members, each said shielding unit lessening magnetic fields exteriorly of respective portions of said housing juxtaposed with the last of magnetically permeable members in said successions.
Claim 15
Dependent Claim
17 words
The deactivation device claimed in claim 14, wherein said magnetically permeable members are comprised of silicon iron.
Claim 16
Dependent Claim
14 words
The deactivation device claimed in claim 15, wherein said magnetically permeable members are annealed.
Claim 17
Dependent Claim
37 words
The deactivation device claimed in claim 14, wherein each said shielding unit further includes a support member and wherein said magnetically permeable members are stacked on said support member and are mechanically secured to said support member.
Claim 18
Dependent Claim
17 words
The deactivation device claimed in claim 17, wherein said magnetically permeable members are comprised of silicon iron.
Claim 19
Dependent Claim
14 words
The deactivation device claimed in claim 18, wherein said magnetically permeable members are annealed.
Claim 20
Dependent Claim
79 words
A deactivation device for inactivating electronic article surveillance tags, comprising: (a) a housing; (b) a coil supported in said housing and having opposed first and second sides and energizable to generate a magnetic field issuing from both said first and second sides thereof; and (c) a magnetically permeable member supported in said housing in juxtaposition with said coil second side, said magnetically permeable member functioning both as a shield for said coil and a pole piece for said coil.
References Cited (Backward Citations)
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