Data communication device

摘要: PROBLEM TO BE SOLVED: To resolve a problem in attachment of reader-writer 2 wherein modulation factors A non-contact IC card 1 are different attaching the to wooden wall 3 and ferrite 4, transmission success rate data is deteriorated unless electrical characteristics adjusted each time accordance with an member reader- writer 2. SOLUTION: When 32 external object such as wall, iron plate shielding magnetic field generated by inserted between 41 object. COPYRIGHT: (C)2003,JPO