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Data carrier system

  • US 6,118,367 A
  • Filed: 11/20/1997
  • Issued: 09/12/2000
  • Est. Priority Date: 11/29/1996
  • Status: Expired due to Fees
First Claim
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1. A data carrier system comprising:

  • a main apparatus including first control means for outputting a first signal and first coil means having at least a transmission coil for transmitting the first signal;

    tuner circuit means having a tuner circuit including a tuning coil disposed facing the transmission coil of said first coil means and [adapted to be] tuned with the frequency of the first signal; and

    a tag including second coil means having at least a reception coil for receiving the first signal transmitted from said main apparatus and second control means for performing predetermined control operation in accordance with the received first signal, wherein said tag moves along a passage between the transmission coil of the main apparatus and said tuning coil of said tuner circuit means and wherein when the sizes of the transmission coil and tuning coil are represented by radii R and r of equivalent circular coils having the same areas as those of the transmission coil and the tuning coil, respectively, R is generally equal to r, and a distance D between said first coil means and said tuner circuit means satisfies the condition of 2R≦

    D≦

    3R.

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