Non-contact IC card and non-contact IC card reader/writer

Details Non-contact IC card and non-contact IC card reader/writer Non-contact IC card and non-contact IC card reader/writer

1995-07-11

1997-04-08

Chin, Stephen

Pulse or digital communications

Transceivers

34082531, 455 73, 235380, H04L 516, H04B 138

Patent

active

056195290

ABSTRACT:
A non-contact IC card or a non-contact IC card reader/writer has an antenna for receiving a signal transmitted from the reader/writer or the IC card, a receiver circuit for demodulating the signal received by the receiving antenna and for converting the demodulated signal into a received data signal, a control circuit for data processing in response to the received data signal, a transmitter circuit for forming a transmission signal in response to a data signal supplied by the control circuit and for setting the transmission width of the transmission signal corresponding to one data bit to a value smaller than the signal width of one data bit, and a transmitting antenna for transmitting the transmission signal from the transmitter circuit to the reader/writer or the IC card. According to a data transmission method of the invention, a data row having a first data item as dummy data is transmitted from the non-contact IC card to the reader/writer and the amplification of the received signal in the reader/writer is controlled so that the intensity of the received dummy data is equal to a predetermined value.

REFERENCES:
patent: 3707711 (1972-12-01), Cole et al.
patent: 4570127 (1986-02-01), Tanimoto et al.
patent: 5068521 (1991-11-01), Yamaguchi
patent: 5202838 (1993-04-01), Inoue
patent: 5212373 (1993-05-01), Fujioka et al.
patent: 5220158 (1993-06-01), Takahira et al.
"Non-Contact Type IC Card For Data Communication with Light", Nikkei Electronics, Mar. 10, 1988, No. 457, pp. 197-202.
"Techniques and Applications of Data Carriers", Nikkan Kyogo Shinbunsha, Oct. 20, 1990, pp. 14-23.

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