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IC-card-and-IC-card-system

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***WITHDRAWN PATENT AS PER THE LATEST USPTO WITHDRAWN LIST*** *** NO IMAGES AVAILABLE***

Description:...

Method for manufacturing a custom-circuit LSI, and a gate array device

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IC card and IC card system

Details

Inventors: Fukuzumi, Tomoya;
Assignee: Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Teska; Kevin J.
Assistant Examiner: Loppnow; Matthew
Attorney, Agent or Firm: Leydig, Voit & Mayer, ltd

An IC card and an IC card system that enable a variety of functions to be added to the IC card. A variety of functions are provided for individual key cards (sub-cards), and the individual key card is detachable from the main body of an IC card so that the addition of and change are easily performed by insertion and change of the individual key card.

DETAILED DESCRIPTION The present invention is directed to overcome the foregoing problems, and therefore an object of the present invention is to provide an IC card and an IC card system that additionally allow a user to easily add or change a portion of the function of the IC card as the need arises or to meet conditions for use even after the IC card has been delivered.
According to a first aspect of the present invention, there is provided an IC card comprising: a main body; and a separative sub-card having a connector for being connected to the main body and an additional function disposed therein.
According to a second aspect of the present invention, there is provided an IC card arranged such that the IC card is an IC card that is connected to the host system at the time of use, the IC card comprising: a function portion disposed to the main body and having a function of the IC card; and switching control means provided over the connector from the main body to the sub-card for operating the function portion in response to a control signal from the host system only when the sub-card is connected to the main body through the connector, whereby insertion/removal of the sub-card causes whether or not the function portion is operated to be switched.
According to a third aspect of the present invention, there is provided an IC card arranged such that the switching control means comprises: first insertion signal generating means for generating a signal indicating insertion of the sub-card when the sub-card has been inserted into the main body; signal control means electrically connected to the first insertion signal generating means for permitting supply of the control signal from the host system to the function portion only when the signal has been supplied from the first insertion signal generating means and inhibitting the supply of the control signal to the function portion in other cases.
According to a fourth aspect of the present invention, there is provided an IC card arranged such that the switching control means comprises: a first signal line provided to the main body and electrically connected to the junction portion; a second signal line provided to the main body for receiving the control signal from the host system; and connection means provided to the sub-card for electrically connecting between the first signal line and the second signal line

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