Registers – Records – Conductive
Reexamination Certificate
1999-07-07
2002-09-24
Lee, Michael G. (Department: 2876)
Registers
Records
Conductive
C235S487000
Reexamination Certificate
active
06454172
ABSTRACT:
TECHNICAL FIELD
The present invention relates generally to IC cards, and more particularly, to an IC card capable of displaying a response state in a data communication.
BACKGROUND OF THE INVENTION
There have been known IC cards used for a data communication with an externally provided interrogator.
FIG. 6
is a schematic block diagram of the basic configuration of a conventional IC card
300
. The conventional IC card
300
as shown is a signal superposing, non-contacting type IC card, supplies power and transmits/receives information using a signal(s) having one or more frequencies received from an interrogator which is not shown.
IC card
300
shown in
FIG. 6
, an example of an IC card using a single frequency, includes a tuning circuit
15
, a rectifying circuit
16
, an amplifying/demodulating circuit
17
, a modulating/amplifying circuit
18
, and an SP/PS conversion circuit
19
.
Tuning circuit
15
includes a coil L functioning as an antenna and a capacitor C. Rectifying circuit
16
rectifies a signal received at tuning circuit
15
to generate electric power and supplies the power to each part of IC card
300
. Meanwhile, amplifying/demodulating circuit
17
amplifies and demodulates information Q from an interrogator received at tuning circuit
15
. A signal output from amplifying/demodulating circuit
17
is SP-converted by SP/Ps conversion circuit
19
.
Referring to
FIG. 6
, this conventional IC card
300
includes a main control circuit
11
and a memory
10
.
Main control circuit
11
processes a signal output from SP/PS conversion circuit
19
. Data output from main control circuit
11
which is to be held is stored (held) in memory
10
for holding data.
Main control circuit
11
reads out data from an addressed region of memory
10
based on the content of information Q received from the interrogator, and generates response information A based on the read out data. Response information A is PS-converted by SP/PS conversion circuit
19
, then processed by modulating/amplifying circuit
18
and transmitted to the interrogator through antenna L.
The response state of such conventional IC card
300
is verified exclusively on the side of the interrogator which is not shown, in other words, conventional IC card
300
does not have a function to verify the response state.
Therefore, information on what is going on in IC card
300
is not available to the side of the user of the card.
For example, if a plurality of IC cards
300
perform a data communication simultaneously or sequentially without time interval, and a response abnormality from any of IC cards
300
is detected on the side of interrogator, the user cannot find which IC card
300
has the abnormality in the data communication.
Thus, the reliability of the entire system including the interrogator and the responding element (IC card) can be hardly secured.
It is therefore an object of the present invention to provide an IC card permitting the user to recognize a response state in a data communication.
Another object of the invention is to provide an IC card capable of continuously displaying a response state in a data communication for a prescribed time period.
DISCLOSURE OF THE INVENTION
An IC card according to the present invention performs a data communication in response to externally applied data, and includes a control circuit to control data reception and a response, and a display to display a response state in response to an instruction from the control circuit.
An IC card according to another aspect of the invention performs a data communication in response to externally applied data, and includes a storing circuit to which the externally applied data is written, a control circuit to control a response using the data written in the storing circuit, and a display to display a response state in response to an instruction from the control circuit.
An IC card according to a further aspect of the invention performs a data communication in response to externally applied data, and includes a first storing circuit to which the externally received data is written, a second storing circuit to save the written data in the first storing circuit, a control circuit to make control for making a response using data in the first or second storing circuit, and a display circuit to display a response state in response to an instruction received from the control circuit.
Therefore, a main advantage of the present invention resides in that the user may readily visually recognize a response state in a data communication.
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Korean Office Action for Application No. 10-1999-7006193 dated Aug. 30, 2001.
Canadian Office Action dated Jan. 8, 2002.
Fujisawa Masanori
Maeda Hiroyuki
Arent Fox Kintner & Plotkin & Kahn, PLLC
Franklin Jamara A.
Lee Michael G.
Rohm & Co., Ltd.
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