Resonant frequency characteristic tag and method of manufacturing the same

Claim 2

Resonant frequency characteristic tag comprising: an electrically insulating thin film having a dielectric characteristic, an electric circuit consisting of a metal foil formed on one side surface of said thin film and having a predetermined length and having opposite end portions respectively formed with a capacitor section and a terminal section, said capacitor section having a piercedly formed hole extending from the side of said metal foil to the other side surface of said thin film, said metal foil being deformed in the formation of said hole into a burr-like portion extending toward said other side surface of said thin film, and an electrode metal foil formed on said other side surface of said thin film and having a size capable of containing said hole, said electrode metal foil being applied to said other side surface of said thin film with an electrically insulating adhesive having a dielectric characteristic such that the free end of said burr-like portion and said electrode metal foil is spaced apart a predetermined distance, said terminal section of said electric circuit being electrically connected to said electrode metal foil to form a resonant frequency circuit.

Claim 3

Method of manufacturing a resonant frequency characteristic tag comprising: a step of forming an electric circuit consisting of a metal foil, having a predetermined length and having an end portion with a capacitor section and a terminal section on one side surface of an electrically insulation thin film having a dielectric characteristic; a step fo forming said capacitor section with a hole by piercing said capacitor section from the side of said metal foil toward the other side surface of said thin film to thereby deform said metal foil such as to form a burr-like portion extending toward said other side surface of said thin film; a step of laminating an electrode metal foil having a size capable of containing said hole to said other side surface of said thin film with an electrically insulating adhesive having a dielectric characteristic such that the free end of said burr­like portion and said electrode metal foil are spaced apart a predetermined distance; and a step of forming a resonant circuit by electrically connecting said terminal section of said electric circuit and said electrode metal foil to each other.

Claim 4

Method of manufacturing a resonant frequency characteristic tag comprising: a step of forming an electric circuit consisting of a metal foil, having a predetermined length and having an end portion with a capacitor section and a terminal section on one side surface of an electrically insulation thin film having a dielectric characteristic; a step fo forming said capacitor section with a hole by piercing said capacitor section from the side of said metal foil toward the other side surface of said thin film to thereby deform said metal foil such as to form a burr-like portion extending toward said other side surface of said thin film; a step of laminating an electrode metal foil having a size capable of containing said hole to said other side surface of said thin film with an electrically insulating adhesive having a dielectric characteristic such that the free end of said burr­like portion and said electrode metal foil are spaced apart a predetermined distance; and a step of forming a resonant circuit by electrically connecting said terminal section of said electric circuit and said electrode metal foil to each other.

Claim 5

Method of manufacturing a resonant frequency characteristic tag as claimed in claim 2, which comprises steps of forming an electric circuit substrate by laminating metal foil to each side surface of an electrically insulating thin film having a dielectric characteristic by such bonding process as a dry lamination process or a thermal press process by using an adhesive having a dielectric characteristic and having a dielectric tangent value equal to or smaller than that of said thin film, printing an electric circuit on the metal foil on one side surface of said electric circuit substrate with an etching resist ink, chemically etching the resultant system to form a resonant circuit and also entirely remove the non-printed metal foil on the other side surface of said thin film, subsequently forming at least one through hole in a capacitor section of said electric circuit by piercing said capacitor section in the thickness direction thereof from the side of said metal foil by using a needle or the like, pressure-bonding an adhesive-coated electrode metal foil having a size greater than the area of said through hole and sufficient to form a resonant circuit using a heated die or the like such as to conceal the opening of said through hole on the side opposite said metal foil of said capacitor section of said electric circuit, short-circuiting a coil terminal section of said electric circuit and an end portion of said electrode metal foil corresponding to a capacitor electrode to each other by means of urging to form said resonant circuit, subsequently applying a printed or non-printed paper sheet or the like to the side of said electric circuit and also a release paper sheet or the like to the opposite electrode metal foil side by an adhesive or the like, and stamping-out or semi-­stamping the resultant lamination with a die to a desired tag size, thus obtaining a resonant frequency characteristic tag.

Claim 6

Method of manufacturing a resonant frequency characteristic tag as claimed in claim 2, wherein said metal foils are each a member of a group consisting of a copper foil, an aluminum foil and an iron foil, said foils being in a coil-like form and capable of being applied continuously and also being etched and having a thickness ranging from 6 to 50 microns.

Claim 7

Method of manufacturing a resonant frequency characteristic tag as claimed in claim 4, wherein said metal foil laminated to each side surface of said electrically insulating thin film is an aluminum foil having a purity ranging from 99.0 to 99.9 %.

Claim 8

Method of manufacturing a resonant frequency characteristic tag as claimed in claim 2, wherein said electrically insulating thin film having a dielectric characteristic is a synthetic resin film having a thickness ranging from 4 to 10 microns and made from a member of a group consisting of polyethylene, polypropylene, polystyrene and polyester.

Claim 9

Method of manufacturing a resonant frequency characteristic tag as claimed in claim 2, wherein said adhesive is a member of a group consistin of polyethylene, polypropylene, polystyrene and polyester, said group members having a dielectric characteristic as dielectric and a dielectric tangent value equal to or smaller than that of said electrically insulating thin film.

Claim 10

Method of manufacturing a resonant frequency characteristic tag as claimed in claim 3, wherein said needle or the like is a needle having a diameter ranging from 0.08 to 0.10 mm and a tip diameter ranging from 0.03 to 0.06 mm.

Claim 11

Method of manufacturing a resonant frequency characteristic tag as claimed in claim 3, wherein said resin coating provided on one side surface of said electrode metal foil has a thickness ranging from 0.0001 to 0.0003 mm and made of the same resin as said dielectric.

Claim 12

Method of manufacturing a resonant frequency characteristic tag as claimed in claim 3, wherein said adhesive used to bond a paper sheet or the like as support to said metal foil such as aluminum foil forming said capacitor is non-heat-­resisting and provides a bonding strength after lamination ranging from 50 to 100 g/cm².

Claim 13

Method of manufacturing a resonant frequency characteristic tag as claimed in claim 3, wherein a very thin film of dielectric formed between a burr-like metal foil portion formed in forming said through hole by using said needle or the like and said electrode metal foil press-bonded ot a portion surrounding said through hole has a thickness ranging from 0.0001 to 0.0002 mm.