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US 2003/0151561 A1Published application
Noncontact type ic card
AssigneeSony Corporation
InventorsShigeru Arisawa, Osamu Ishii, Toshiharu Tsuchiya
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AssigneeSony Corporation
InventorsShigeru Arisawa, Osamu Ishii, Toshiharu Tsuchiya
Estimating the term…
The present invention relates to an electronic device that suppresses reduction in reception sensitivity and occurrence of distortion when IC cards are used while stacked. A loop antenna 1 equipped to the IC card has four turns, and it is designed so that one turn comprises a linear portion L2, a curved line portion L3, a linear portion L4 and a curved line portion L5, for example. When two loop antennas 1 having such a shape is stacked with being faced in the opposite directions, the corners thereof are not overlapped. For example, the corner formed of the curved line portion L3 and the linear portion L4 of the loop antenna 1 is overlapped with the curved line portion L3 of the loop antenna 1 superimposed with being faced in the opposite direction, so that the corners are not overlapped and the overlap portion is reduced as a whole. The present invention may be applied to an IC card for receiving/transmitting data under non-contact state.
A substantially-planar electronic device having a substantially rectangular shape containing a loop antenna, characterized in that said loop antenna is shaped so that even when plural electronic devices are stacked so that at least parts of the top sides thereof face one another or at least parts of the back sides thereof face one another, conductors constituting the portions of said loop antennas which are located in the neighborhood of the corners of the electronic devices each having the substantially rectangular shape are prevented from being overlapped with one another.
A substantially-planar electronic device having a substantially rectangular shape containing a loop antenna, characterized in that one of two corner portions that are disposed so as to sandwich the center line therebetween is disposed to be close to the center line, and the other corner portion is disposed to be far away from the center portion.
A substantially-planar electronic device having a substantially rectangular shape containing a loop antenna, characterized in that said loop antenna is shaped so that the line connecting two points of said loop antenna that are located at the closest positions to the corners of said electronic device so as to confront each other is coincident with a diagonal line of said electronic device having a substantially rectangular shape.
An information writing/reading device for writing/reading information into/from a substantially-planar electronic device having a substantially rectangular shape containing a loop antenna, characterized by including reading/writing means for writing/reading information into/from plural electronic devices when said plural electronic devices are partially overlapped with one another, said plural electronic devices having loop antennas shaped so that when said plural electronic devices are stacked so that at least parts of the top sides thereof face one another or at least parts of the back sides thereof face one another, conductors constituting the portions of said loop antennas that are located in the neighborhood of the corners of said electronic devices each having a substantially rectangular shape are not overlapped with one another.
An information writing/reading method for writing/reading information into/from a substantially-planar electronic device having a substantially rectangular shape containing a loop antenna, characterized by including a writing/reading step of writing/reading information into/from plural electronic devices when the plural electronic devices are partially overlapped with one another, the plural electronic devices having loop antennas shaped so that when the plural electronic devices are stacked so that at least parts of the top sides thereof face one another or at least parts of the back sides thereof face one another, the conductors constituting the portions of the loop antennas that are located in the neighborhood of the corners of the electronic devices each having a substantially rectangular shape are not overlapped with one another.
Dependencies are inferred from the claim text.