Resonant tag
First Claim
Patent Images
1. A resonant tag comprising an insulating thin film having a thickness of 10 to 30 μ
- m, and coiled circuits made of a metal foil respectively formed on both sides of the insulating thin film, wherein the coiled circuits are formed in an electrically connected relation to each other with a space at the center of the insulating thin film, said both coils are formed taking turns in reverse directions to each other when viewed from the same direction and almost superimposed on each other except portions that cannot be superimposed on each other because the turning directions of the coils are reversed with the exception of the outermost peripheries when viewed from a direction perpendicular to the thin film, thereby forming a capacitor to constitute an LC circuit, the widths of portions of said both circuits, which correspond to each other, are almost equal except the outermost peripheries, the area of a portion of each side of the thin film, said portion being surrounded by the innermost peripheries of both coils and having no metal foil on both sides, is at least 16% based on the whole area of said one side of the tag, a thin-wall part where the thickness of its corresponding insulating film portion is thinner than that of its remaining portion is formed in part of the portions where said both circuits are superimposed on each other, the resonant tag resonates with a wave of the predetermined radio frequency and undergoes dielectric breakdown at the thin-wall part when applying the prescribed voltage or higher voltage to the tag, whereby the resonant tag can be prevented from resonating with the wave of said radio frequency, and the resonant tag has an area of at most 700 mm2.
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Accused Products
Abstract
The invention relates to a resonant tag including an insulating thin film and coiled circuits made of a metal foil respectively formed on both sides of the insulating thin film. The coiled circuits are formed in an electrically connected relation to each other with a space at the center of the insulating thin film. Said both coils are almost superimposed on each other to form a capacitor, thereby constituting an LC circuit. The area of a portion of each side of the thin film, said portion being surrounded by the innermost peripheries of both coils and having no metal foil on both sides, is controlled to at least 16% based on the whole area of said one side of the tag, whereby a resonant tag having an area of at most 700 mm2 can be obtained.
116 Citations
21 Claims
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1. A resonant tag comprising an insulating thin film having a thickness of 10 to 30 μ
- m, and coiled circuits made of a metal foil respectively formed on both sides of the insulating thin film, wherein the coiled circuits are formed in an electrically connected relation to each other with a space at the center of the insulating thin film, said both coils are formed taking turns in reverse directions to each other when viewed from the same direction and almost superimposed on each other except portions that cannot be superimposed on each other because the turning directions of the coils are reversed with the exception of the outermost peripheries when viewed from a direction perpendicular to the thin film, thereby forming a capacitor to constitute an LC circuit, the widths of portions of said both circuits, which correspond to each other, are almost equal except the outermost peripheries, the area of a portion of each side of the thin film, said portion being surrounded by the innermost peripheries of both coils and having no metal foil on both sides, is at least 16% based on the whole area of said one side of the tag, a thin-wall part where the thickness of its corresponding insulating film portion is thinner than that of its remaining portion is formed in part of the portions where said both circuits are superimposed on each other, the resonant tag resonates with a wave of the predetermined radio frequency and undergoes dielectric breakdown at the thin-wall part when applying the prescribed voltage or higher voltage to the tag, whereby the resonant tag can be prevented from resonating with the wave of said radio frequency, and the resonant tag has an area of at most 700 mm2.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19, 20, 21)
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18. A resonant tag comprising an insulating thin film having a thickness of 10 to 30 μ
- m, and coiled circuits made of a metal foil respectively formed on both sides of the insulating thin film, wherein the coiled circuits are each composed of linear portions, curved portions for connecting the linear portions to each other, a triangular plate portion formed at a part of the outermost periphery of the coil, and a rectangular plate portion formed at the innermost end of the coil, the number of turns of said coil being 2 to 12, and are formed in an electrically connected relation to each other at the innermost plate portions with a space at the center of the insulating thin film, said both coils are formed taking turns in reverse directions to each other when viewed from the same direction and superimposed on each other except portions that cannot be superimposed on each other because the turning directions of the coils are reversed with the exception of the outermost peripheries when viewed from a direction perpendicular to the thin film, thereby forming a capacitor to constitute an LC circuit, the widths of portions of said both circuits, which correspond to each other, are almost equal except the outermost peripheries, the area of a portion of each side of the thin film, said portion being surrounded by the innermost peripheries of both coils and having no metal foil on both sides, is 16 to 50% based on the whole area of said one side of the tag, the total area of the superimposed portions of said both coiled circuits is at least 72% based on the whole area of the circuits on said both sides, an average deviation between the superimposed portions of said both coiled circuit patterns is at most 0.15 mm, a line spacing in said both coiled circuits is at most 400 μ
m, a thin-wall part where the thickness of its corresponding insulating film portion is thinner than that of its remaining portion is formed in the triangular plate portion, the resonant tag resonates with a wave of the predetermined radio frequency and undergoes dielectric breakdown at the thin-wall part when applying the prescribed voltage or higher voltage to the tag, whereby the resonant tag can be prevented from resonating with the wave of said radio frequency, and the resonant tag is in the form of a rectangle (including a square) of at most 25 mm×
28 mm in external dimensions.
- m, and coiled circuits made of a metal foil respectively formed on both sides of the insulating thin film, wherein the coiled circuits are each composed of linear portions, curved portions for connecting the linear portions to each other, a triangular plate portion formed at a part of the outermost periphery of the coil, and a rectangular plate portion formed at the innermost end of the coil, the number of turns of said coil being 2 to 12, and are formed in an electrically connected relation to each other at the innermost plate portions with a space at the center of the insulating thin film, said both coils are formed taking turns in reverse directions to each other when viewed from the same direction and superimposed on each other except portions that cannot be superimposed on each other because the turning directions of the coils are reversed with the exception of the outermost peripheries when viewed from a direction perpendicular to the thin film, thereby forming a capacitor to constitute an LC circuit, the widths of portions of said both circuits, which correspond to each other, are almost equal except the outermost peripheries, the area of a portion of each side of the thin film, said portion being surrounded by the innermost peripheries of both coils and having no metal foil on both sides, is 16 to 50% based on the whole area of said one side of the tag, the total area of the superimposed portions of said both coiled circuits is at least 72% based on the whole area of the circuits on said both sides, an average deviation between the superimposed portions of said both coiled circuit patterns is at most 0.15 mm, a line spacing in said both coiled circuits is at most 400 μ
Specification
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Current AssigneeCheckpoint Manufacturing Japan Co., Ltd. (CCL Industries Incorporated)
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Original AssigneeCheckpoint Manufacturing Japan Co., Ltd. (CCL Industries Incorporated)
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InventorsMatsumoto, Takeshi, Imaichi, Hideaki, Piccoli, Anthony Frank, Mazoki, Gary Thomas
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Primary Examiner(s)Lee, Benjamin C.
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Application NumberUS09/732,312Publication NumberTime in Patent Office334 DaysField of Search340/572.3, 340/572.5, 340/572.1, 340/572.2, 340/572.7, 29/254.2, 296/021, 298/48, 298/32, 295/93, 361/777, 361/765, 324/675, 333/167, 428/209, 343/895, 156/60, 156/272.2, 336/105, 257/531US Class Current340/572.5CPC Class CodesG08B 13/2414 using inductive tagsG08B 13/2417 having a radio frequency id...G08B 13/2434 Tag housing and attachment ...G08B 13/2437 Tag layered structure, proc...G08B 13/2442 Tag materials and material ...Y10T 29/435 Solid dielectric typeY10T 29/4902 Electromagnet, transformer ...Y10T 29/4913 Assembling to base an elect...
