Patent ID: 7280076

Claim:
An information processing apparatus comprising a case including an insulating casing, an electric shield disposed in said case, and a contactless reader and/or writer disposed in said case; said contactless reader and/or writer comprising: a transceiver disposed within said case for transmitting and/or receiving an RF modulated carrier signal; and a coil antenna having a plurality of conductor turns coupled to said transceiver and disposed in a space between said electric shield and said casing within said case, for transmitting and/or receiving an RF modulated carrier signal by magnetic coupling; said coil antenna including a predetermined number of turns wound into a generally tubular shape about one center axis to have a predetermined length and a predetermined diameter, said coil antenna having a coil plane at one end of said predetermined length; no part of said electric shield being present between said coil plane and a part of said casing facing said coil plane on said one center axis, said coil antenna having its outer side spaced from said electric shield by a predetermined distance.