IC card

• US 6,173,900 B1
• Filed: 10/27/1999
• Issued: 01/16/2001
• Est. Priority Date: 10/30/1998
• Status: Expired due to Term

• Current Assignee: DENSO Corporation, Hitachi, Ltd., Nippon Telegraph and Telephone Corporation
• Original Assignee: Hitachi, Ltd.
• Inventors: Sugiura, Masahiro, Kanno, Shin, Oonishi, Tadashi, Tsuru, Koji, Dobashi, Hisanobu, Date, Shigeru, Andou, Kimiaki, Yoshigi, Hiroshi, Ookawa, Takehiro, Yoshino, Ryouzou
• Primary Examiner(s): Pitts, Harold I.
• Application Number:
  US09/427,596
• Time in Patent Office: 447 Days
• Field of Search: 342/50, 235/380, 235/492, 343/720
• US Class Current: 235/492
• CPC Class Codes: G06K 19/07749 the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
• CPC Class Codes: G06K 19/07779 the inductive antenna being a coil
• CPC Class Codes: G06K 19/07796 arrangements on the record carrier to allow stacking of a plurality of similar record carriers, e.g. to avoid interference between the non-contact communication of the plurality of record carriers

Abstract

An object of the present invention is able to provide an IC card in which for example, even if a state should occur in which a plurality of IC cards are piled up in any direction for use, a received signal is not greatly lowered but a normal usage pattern is secured.

When the IC cards are piled up with the contours united, a projection drawing of an antenna of one IC card to an antenna surface of the other IC card has an area not overlapped at least 15% or more of an area having an antenna to the other antenna surface on the projection surface and the IC card can work.

Claims

1. An IC card at least comprising a first substrate, an IC element arranged on a fixed portion of said first substrate, an antenna electrically connected to said IC element, and a second substrate at least covering said IC element and said antenna, wherein:

when the concerned IC cards are piled up with the contours united, a projection drawing of an antenna of one IC card to an antenna surface of the other IC card has an area not overlapped to said other antenna surface on said projection surface, and the concerned IC card can work.

10. An IC card according to claim 1, wherein a planar shape to be a fundamental of said antenna is an ellipse.

11. An IC card according to claim 1, wherein a planar shape to be a fundamental of said antenna includes a straight line portion.

12. The IC card according to claim 1, wherein a planar shape to be a fundamental fo said antenna is replaced in a corner portion of a polygon with curved line.

2. An IC card at least comprising a first substrate, an IC element arranged on a fixed portion of said first substrate, an antenna electrically connected to said IC element, and a second substrate at least covering said IC element and said antenna, wherein:

when said IC cards are piled up with the contours united, a projection drawing of an antenna of one IC card to an antenna surface of the other IC card has an area not overlapped at least 15% or more of an area having an antenna to said other antenna surface on said projection surface.

3. An IC card at least comprising a first substrate, an IC element arranged on a fixed portion of said first substrate, an antenna electrically connected to said IC element, and a second substrate at least covering said IC element and said antenna, wherein a shape of said antenna on said antenna surface is asymmetrical with respect to left and right and top and bottom.

4. An IC card at least comprising a first substrate, an IC element arranged on a fixed portion of said first substrate, an antenna electrically connected to said IC element, and a second substrate at least covering said IC element and said antenna, wherein:

when a long axis of a planar shape of said antenna, the longest side, or the longest straight line obtained by connecting suitable two points with a straight line is longer than a short side of said IC card, and when said IC cards are piled up with the contours united, a projection drawing of an antenna of one IC card to an antenna surface of the other IC card has an area not overlapped to said other antenna surface on said projection surface, and said IC card can work.

5. An IC card at least comprising a first substrate, an IC element arranged on a fixed portion of said first substrate, an antenna electrically connected to said IC element, and a second substrate at least covering said IC element and said antenna, wherein:

when a long axis or the longest side of a planar shape of said antenna, or the longest straight line obtained by connecting suitable two points with a straight line is longer than a short side of said IC card, and when said IC cards are piled up with the contours united, a projection drawing of an antenna of one IC card to an antenna surface of the other IC card has an area not overlapped at least 15% or more of an area of the antenna to said other antenna surface on said projection surface.

6. An IC card at least comprising a first substrate, an IC element arranged on a fixed portion of said first substrate, an antenna electrically connected to said IC element, and a second substrate at least covering said IC element and said antenna, wherein:

when a long axis, the longest side of a planar shape of said antenna, or the longest straight line obtained by connecting suitable two points with a straight line is longer than a short side of said IC card, a shape of said antenna on said antenna surface is asymmetrical with respect to left and right and top and bottom.

7. An IC card at least comprising a first substrate, an IC element arranged on a fixed portion of said first substrate, an antenna electrically connected to said IC element, and a second substrate at least covering said IC element and said antenna, wherein:

said antenna is a coil formed on said first substrate, and when said IC cards are piled up with the contours united, a projection drawing of an antenna of one IC card to an antenna surface of the other IC card has an area not overlapped to said other antenna surface on said projection surface, and said IC card can work.

8. An IC card at least comprising a first substrate, an IC element arranged on a fixed portion of said first substrate, an antenna electrically connected to said IC element, and a second substrate at least covering said IC element and said antenna, wherein;

said antenna is a coil formed on said first substrate, and when said IC cards are piled up with the contours united, a projection drawing of an antenna of one IC card to an antenna surface of the other IC card has an area not overlapped at least 15% or more of an area of the antenna to said other antenna surface on said projection surface.

9. An IC card at least comprising a first substrate, an IC element arranged on a fixed portion of said first substrate, an antenna electrically connected to said IC element, and a second substrate at least covering said IC element and said antenna, wherein said antenna is a coil formed on said first substrate, and a shape of said antenna on said antenna surface is asymmetrical with respect to left and right and top and bottom.

13. An antenna part material at least comprising a first substrate, an antenna arranged on a fixed portion of said first substrate, and a second substrate at least covering said antenna, said antenna part material capable of carrying out transmission and reception of a signal by wireless, wherein:

when said antenna part materials are piled up with the contours united, a projection drawing of an antenna of antenna part material to an antenna surface of the other antenna part material has an area not overlapped to said other antenna surface on said projection surface, and said antenna part material can work.

14. An antenna part material at least comprising a first substrate, an antenna arranged on a fixed portion of said first substrate, and a second substrate at least covering said antenna, said antenna part material capable of carrying out transmission and reception of a signal by wireless, wherein:

when said antenna part materials are piled up with the contours united, a projection drawing of an antenna of antenna part material to an antenna surface of the other antenna part material has an area not overlapped at least 15% or more of an area of the antenna to said other antenna surface on said projection surface.

15. An antenna part material at least comprising a first substrate, an antenna arranged on a fixed portion of said first substrate, and a second substrate at least covering said antenna, said antenna part material capable of carrying out transmission and reception of a signal by wireless, wherein a planar shape on said antenna surface of said antenna is asymmetrical with respect to left and right and top and bottom.