Registers – Records – Conductive
Patent
1993-01-14
1995-01-03
Hajec, Donald
Registers
Records
Conductive
G06K 1906
Patent
active
053788877
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a non-contact type integrated circuit (IC) card not having contact terminals for a power source and for inputting and outputting signals.
BACKGROUND ART
There has been known an IC card which as not contact terminals for receiving signals from an external device or for outputting signals thereto via a magnetic or capacitive coupling therewith. When using the non-contact type IC card, as compared with the card achieving communications of signals via contact terminals, the read operation is facilitated since, for example, when a person having the card in his or her hand approaches the external device, data stored in the card can be read therefrom into the external device. Moreover, there can be prevented such problems associated with the card achieving input and output operations of data via contact terminals as a contact failure due to dirt, erosion, etc. of terminal contact points and wrong operations due to a leakage current.
For the read operation of the non-contact type IC card, the card bearer having the card with him or her need only approach the reader and there is unnecessitated a read operation to insert the card into the reader. Consequently, the card is suitable for a check of sequential passage of many persons, for example, the card is suitably used as a commuter pass or a key for checking entrance an exit for a particular room.
In a case where the non-contact type IC card is adopted as a commuter pass or a key for checking entrance and exit for a room, ID data is read from a memory of the IC card for a collation thereof such that when the collation results in a coincidence, the passage of the gate or the entrance for the room is admitted. At the same time, historical data of uses of the IC card is written in the memory thereof.
When a non-contact type IC card is brought into an area accessible to the reader-writer, the collation and the write operation of the history are accomplished. Since the accessible area has a range of a certain magnitude, when the card is employed as, for example, a commuter pass, there may occur depending on actions of the card holder a case where an identical card enters two or more times the area accessible to the reader-writer installed at the gate. Namely, it may possible occur, the user puts the card into the area, removes the card from the area, and then puts again the card into the area. In such a case, it is necessary to avoid the write operation of history in the second access.
Conventionally, in the case above, the second access of an identical card is detected by the reader-writer to inhibit the write operation of new data on the card. However, since passage of many cards is required to be checked in a short period of time at the gate, it is necessary for the reader-writer, after an access of a card, to wait for passage of a subsequent card. Consequently, there does not exit any marginal time enough to check the second access.
In consequence, it is desired that the operation of a card is inhibited for a fixed period of time after a passage thereof. However, in a card not having a power source therein, namely, a card of an external power supply type, an electromagnetic energy supplied from an external device is rectified to obtain a direct-current (dc) voltage necessary for an internal circuit thereof. Consequently, after the external energy supply is interrupted, it is difficult to control the operation inhibition for a fixed period of time. For example, after the external energy supply is stopped, the circuit in the card may be operated by energy resultant from discharge of electric charges accumulated in a smoothing capacitor of the power source circuit. However, since the operation of the circuit is determined by a value of a current consumed by the circuit and the energy accumulated in the smoothing capacitor, it is difficult to set the period for inhibiting the operation.
Moreover, in such a non-contact type IC card, since the contact (approaching) state between the card and the reader-writer cannot be
REFERENCES:
patent: 4841131 (1989-06-01), Iijima
patent: 4962485 (1990-10-01), Kato et al.
patent: 5157247 (1992-10-01), Takahira
patent: 5182442 (1993-01-01), Takahira
patent: 5191192 (1993-03-01), Takahira et al.
patent: 5212373 (1993-05-01), Fujioka et al.
patent: 5220158 (1993-06-01), Takahira et al.
patent: 5225667 (1993-07-01), Furuta et al.
Filipek Jeffrey R.
Hajec Donald
Kyodo Printing Co., Ltd.
LandOfFree
Non-contact type IC card does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Non-contact type IC card, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Non-contact type IC card will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2212748