Resonant frequency characteristic tag and method of manufacturing the same

Claim 1

A resonant frequency characteristic tag comprising a thin dielectric film (2) made of polymer such as polyethylene, a pair of resonant frequency characteristic circuits each formed on each side of said thin dielectric film (2), made of a metal foil (1,3) such as an aluminum foil and having a particular resonant frequency, said two resonant frequency characteristic circuits having terminal sections (5,6) short-circuited to one another, a release paper (8) such as silicone coated paper applied by a pressure sensitive adhesive (7) to the surface of one of said two resonant frequency characteristic circuits, and a through hole (9) with a diameter in a range between 0.5 and 3 mm being formed through an electrode plate (13) in a capacitor section in the surface of said circuit on the side of said release paper (8) such that it reaches an electrode plate (13) in a capacitor section in the surface of the other circuit, the distance between said two electrode plates (13) being adjusted to a predetermined dimension by heating and pressing a portion at the periphery of said through hole (9) with a suitable tool.

Claim 3

A method of manufacturing a resonant frequency characteristic tag comprising the steps of: forming a pair of resonant frequency characteristic circuits having a particular resonant frequency each formed on each side of a thin dielectric film made of polymers such as polyethylene by laminating metal foils such as an aluminum foil on said each side and printing a printed circuit pattern on said metal foil, causing short-circuit between terminal sections of said two resonant frequency characteristic circuits on both sides of said dielectric film, applying a release paper such as silicone coated paper to one of said two circuits by using a pressure sensitive adhesive, forming a through hole with a diameter in a range between 0.5 and 3 mm through an electrode plate in a capacitor section in the surface of said circuit on the side of said release paper such that it reaches an electrode plate of a capacitor section in the surface of the other circuit, and adjusting the distance between said two electrode plates to a predetermined dimension by heating and pressing a portion at the periphery of said through hole with a suitalbe tool.

Claim 4

A method of manufacturing a resonant frequency characteristic tag comprising the steps of: forming a pair of resonant frequency characteristic circuits having a particular resonant frequency each formed on each side of a thin dielectric film made of polymers such as polyethylene by laminating metal foils such as an aluminum foil on said each side and printing a printed circuit pattern on said metal foil, causing short-circuit between terminal sections of said two resonant frequency characteristic circuits on both sides of said dielectric film, applying a release paper such as silicone coated paper to one of said two circuits by using a pressure sensitive adhesive, forming a through hole with a diameter in a range between 0.5 and 3 mm through an electrode plate in a capacitor section in the surface of said circuit on the side of said release paper such that it reaches an electrode plate of a capacitor section in the surface of the other circuit, and adjusting the distance between said two electrode plates to a predetermined dimension by heating and pressing a portion at the periphery of said through hole with a suitalbe tool.

Claim 11

A method of manufacturing a resonant frequency characteristic tag, comprising the steps of forming a pair of resonant frequency characterisitc circuits having a particular resonant frequency on each side of a thin dielectric film made of polymer such as polyethylene together with a hole for short-­circuit between said two circuits by applying a metal foil such as aluminum foil on each said side, printing an etching-resist ink on each said metal foil such that a printed circuit is formed from each said metal foil by a gravure or like printing process and a circular opening with a diameter in a range of 0.3 to 2 mm is formed in one of electrode plates of capacitor sections of said two circuits or each of said electrode plates such that the two openings overlap and carrying out chemical etching treatment, causing short-circuit between terminal sections of both said metal foils, applying a release paper such as silicone coated paper to the side of one of said two circuits by using a pressure sensitive adhesive, adjusting the distance between said two electrodes to a predetermined dimension by urging a portion of the capacitor section electrode plate of the other circuit in the periphery of the opening inclusive of the opening with a tool heated to a surface temperature in a range of 200 and 250 °C, applying a paper such as woodfree paper to the side of said dielectric opposite said release paper by using an adhesive, and cutting thus prepared resonant frequency characteristic sheet to a predetermined size to obtain the intended tag.

Claim 12

A method of manufacturing a resonant frequency characteristic tag, comprising the steps of forming a pair of resonant frequency characterisitc circuits having a particular resonant frequency on each side of a thin dielectric film made of polymer such as polyethylene together with a hole for short-­circuit between said two circuits by applying a metal foil such as aluminum foil on each said side, printing an etching-resist ink on each said metal foil such that a printed circuit is formed from each said metal foil by a gravure or like printing process and a circular opening with a diameter in a range of 0.3 to 2 mm is formed in one of electrode plates of capacitor sections of said two circuits or each of said electrode plates such that the two openings overlap and carrying out chemical etching treatment, causing short-circuit between terminal sections of both said metal foils, applying a release paper such as silicone coated paper to the side of one of said two circuits by using a pressure sensitive adhesive, adjusting the distance between said two electrodes to a predetermined dimension by urging a portion of the capacitor section electrode plate of the other circuit in the periphery of the opening inclusive of the opening with a tool heated to a surface temperature in a range of 200 and 250 °C, applying a paper such as woodfree paper to the side of said dielectric opposite said release paper by using an adhesive, and cutting thus prepared resonant frequency characteristic sheet to a predetermined size to obtain the intended tag.