Non-contact IC card

United States Patent [19]

Matsubara

[54] NON-CONTACT IC CARD

[75] Inventor: Toshiyuki Matsubara, Itami, Japan

[73] Assignee: Mitsubishi Denki Kabushiki Kaisha,

Tokyo, Japan

[21] Appl. No.: 267,374

[22] Filed: Jun. 29,1994

[30] Foreign Application Priority Data

Jul. 5, 1993 [JP] Japan 5-165689

[51] Int. CI.6 G06K 19/067

[52] U.S. CI 235/492; 235/493; 902/26

[58] Field of Search 235/492, 493,

235/380; 902/26

[56] References Cited

U.S. PATENT DOCUMENTS

4,372,699 2/1983 Quinn, Jr. 400/625

4,692,601 9/1987 Nakano 235/380

4,800,255 1/1989 Imran 235/492 X

5,068,521 11/1991 Yamaguchi 235/492

5,105,074 4/1992 Nara 235/492

5,274,221 12/1993 Matsubara 235/492

FOREIGN PATENT DOCUMENTS

04054581 2/1992 Japan . 05290228 11/1993 Japan . 065161594 6/1994 Japan .

OTHER PUBLICATIONS

Nikkei Electronics, Sep. 1986, No. 44, pp. 133-144. "Data Carrier", Chapter 5, pp. 101-106^no date.

Primary Examiner—Donald T. Hajec

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US005569903A [ii] Patent Number: 5,569,903 [45] Date of Patent: Oct. 29, 1996

Assistant Examiner—Jeffrey R. Filipek
Attorney, Agent, or Firm—Leydig, Voit & Mayer

[57] ABSTRACT

A contact type IC card includes a power supply terminal, a reset terminal and an input/output terminal connected to an external device, an input/output circuit for receiving data from and delivering data to an external device through the input/output terminal, a data processing circuit connected to the input/output circuit for processing data, a memory circuit connected to the data processing circuit for storing data, and an internal reset signal generator for latching a predetermined potential when source power is applied from the external device through the power supply terminal, generating an internal reset signal by using the latched potential to bring the circuits info reset states, and stopping generation of the internal reset signal to release the circuits from reset states when a reset release signal is input from the external device through the reset terminal. A non-contact type IC card includes, as specific parts, a transmitting/receiving circuit, a battery and an oscillation unit for stopping oscillation of a clock signal and starting the oscillation of a clock signal to supply the clock signal to the data processing circuit when a trigger signal is received through the transmitting/receiving circuit. A reset sequence is performed reliably and consumption of the battery is suppressed.

5 Claims, 11 Drawing Sheets