JPH08139831A - Telephone set - Google Patents

Abstract

PURPOSE: To prevent leakage of an electric signal to an external device or input of illegal electric signal from the external device by detecting the number of revolutions of a 1st feed roller of the telephone set so as to detect the presence of illegal wiring of an IC card. CONSTITUTION: When an IC card 110 is inserted from a card insert port 106 for the use, after the IC card 110 reaches a 2nd feed roller 102 and detaches from the 1st feed roller 101 and starts carrying up to a final position, the 1st feed roller 101 is turned in a reverse direction to a turning direction to insert the card and detects the number of revolutions within a specified time. Only when the detected number of revolutions per unit time is within the specified number, and the contact pins 105 are brought into contact with terminals of the IC card 110 for the communication. Thus, when the regular IC card 110 is utilized, the communication is available and when an illegal IC card 110 is used, illegal wiring is detected to prevent the use of the illegal IC card 110.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to illegal use in an IC card system, and more particularly to a telephone (reader / writer) capable of preventing leakage of electric signals to the outside and input of illegal signals from the outside.

[0002]

2. Description of the Related Art IC cards have been attracting attention as new information recording media, especially as information recording media to replace magnetic cards, and are becoming increasingly popular. The IC card is a small card on which an IC module in which a memory, electrodes, and the like are integrated is mounted. Conventionally, in an IC card system in which the IC card is used by inserting it into a telephone
It is used as a C prepaid card. An IC card system that uses a telephone by using an IC card is one in which a user purchases an IC prepaid card as needed, sets the card in a public telephone and makes a call, and is a reader / writer (R / W) public. The telephone reads the frequency in the memory of the IC card by an electric signal and controls the continuous disconnection of the call according to the remaining frequency. However, as shown in FIG. 2, even if an illegal wiring is connected to the terminals of the IC card and an IC breadboard (evaluation board) is used,
There was a problem that it could be used. In order to deal with this, conventionally, in the case of this system, in order to prevent leakage of an electric signal by connecting the illegal wiring to the terminal of the card and reading the electric signal to the outside, a telephone ( The method of installing at the entrance of the reader / writer was adopted.

[0003]

However, according to this conventional method, the public telephone requires a movable part for opening and closing the lid, which causes a problem that a failure is likely to occur and that the lid is easily tampered with by breaking the lid. There was a problem that it was possible to insert various cards. Further, there is a problem that it cannot be prevented if the illegal wiring itself from the IC card is extremely thin. Under such circumstances, the present invention intends to provide a telephone (reader / writer) that has a simple structure, does not cause a failure, and can prevent leakage of an electric signal to the outside and input of an illegal electric signal from the outside. It is what

[0004]

The telephone of the present invention is an IC
A telephone in an IC card using system, wherein a card is inserted into a card insertion opening of a telephone and a terminal of the IC card and a contact pin of the telephone are brought into contact with each other to be used.
A first feed roller that conveys the IC card from the card insertion slot of the telephone to the inside of the telephone, and a second feed roller that conveys the IC card to the final position where the terminals of the IC card and the contact pins of the telephone can contact each other. When the IC card is used by inserting it from the card insertion slot, the IC card reaches the second feed roller, separates from the first feed roller, and starts conveyance to the final position. The feed roller is rotated in the direction opposite to the rotation direction for inserting the card, the number of rotations per specified time is detected, and only when the detected number of rotations per specified time is within the specified value, the IC The card is conveyed to the final position, the contact pin is brought into contact with the terminal of the IC card, and communication is performed.

[0005]

As described above, in the telephone of the present invention, when the IC card is used by inserting it from the card insertion slot, the IC card reaches the second feed roller, separates from the first feed roller, and reaches the final position. After the start of conveyance, the first feed roller is rotated in the direction opposite to the rotation direction for inserting the card, the number of rotations per specified time is detected, and the detected number of rotations per specified time is Only when the value is within the specified value, the IC card is conveyed to the final position, the contact pin is brought into contact with the terminal of the IC card (contact), and communication is performed, so that a legitimate IC free from unauthorized wiring
If the card is used, communication is possible, and if the illegal IC card with the illegal wiring is used, the illegal wiring can be detected to prevent the illegal IC card from being used. Specifically, the fact that the number of rotations of the first feed roller in the direction opposite to the rotation direction for inserting the card is different between when the load is applied due to incorrect wiring and when the load is not applied is used. By
It detects the presence or absence of unauthorized wiring, which can prevent an unauthorized person from leaking an electrical signal or inputting an unauthorized signal to the outside. That is, it is impossible to use an IC breadboard (evaluation board) in which illegal wiring is connected to the terminals of the IC card.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a telephone according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a main part configuration of a telephone according to an embodiment. In FIG. 1, 100 is a public telephone, 101 is a first feed roller, 101A and 101B are rollers, 102 is a second feed roller, and 102A, 102B is a roller, 10
3 is a rotation speed detecting unit, 104 is a contact, 105 is a contact pin, 106 is a card insertion slot, and 110 is an IC card. The public telephone 100 of this embodiment shown in FIG.
Insert the IC card 110 into the card slot 1 of the public telephone 100
After being inserted from 06, the terminal of the IC card 110 and the terminal pin 105 of the contact 104 of the public telephone 100 are used in contact with each other. It is a telephone that detects whether or not illegal wiring is connected to the IC card each time it is inserted and used.

The operation for detecting the presence or absence of illegal wiring will be described below with reference to FIG. 1A is a diagram when the IC card 110 is inserted from the card insertion opening 106, and shows the IC card 110 being conveyed only by the first feed roller 101, and FIG. 1B is the IC card 11
0 reaches the second feed roller 102, separates from the first feed roller 101, and starts conveyance to the final position, and then the rotation direction for inserting the first feed roller 101 into the IC card 110 is It is a figure which shows the state rotated in the reverse direction. When the IC card is used by inserting it into the card insertion slot of the telephone, as shown in FIG. 1A, first, the IC card 110 is conveyed by the first feed roller 101 and then as shown in FIG. Then, it reaches the second feed roller 102, separates from the first feed roller 101, and the conveyance is started only by the second feed roller 102. On this occasion,
The first feed roller 101 is rotated in a direction opposite to the rotation direction when the card is inserted, and the rotation speed is the roller 101A,
It is set to a predetermined rotation speed (N rotations / minute) when nothing is interposed between 101B. If the inserted IC cart is a legitimate card, nothing is interposed between the rollers 101A and 101B, and thus the predetermined rotation speed (N rotations / minute) is detected by the rotation speed detection unit 103. If the IC cart has illegal wiring, rollers 101A, 10
Since the illegal wiring is interposed between 1B, the load due to the illegal wiring is applied to the first feed roller 101, and the rotation speed detected by the rotation speed detecting unit 103 is higher than that in the case of the regular IC card without the illegal wiring. Low M revolutions / minute (M <N)
Becomes Here, the rotation speed n detected by the rotation speed detection unit 103 is set to N-α ≦ n ≦ N + β (0 ≦ α, 0 ≦
In the case of β), the IC card 110 is transported to the final position where the terminals of the IC card and the contact pin of the telephone can contact (contact), and communication is enabled. In other cases, the IC card 110 is not transported to the final position, or communication is performed. Set it so that it is not allowed. α and β are appropriately determined so that the presence / absence of illegal wiring can be determined. If there is illegal wiring, M <N-α, and the illegal IC card becomes IC
Either the terminal of the card and the contact pin of the telephone cannot be contacted (contacted), or the contact pin cannot be contacted (contacted) even if it is transferred.

The first feed roller 10 in this embodiment
Both the first and second feeding rollers 102 are the IC card 1
10 is sandwiched between both sides, and the IC card 110 is conveyed by the rotational force of the rollers. If there is no IC card, the rollers 101A, 101B and the rollers 102A, 1
02B comes into contact. In this embodiment, the number of rotations of the first feed roller 101 is detected, but a pair of rollers (not shown) different from the first feed roller 101 are separately provided for rotation. The number may be detected.

[0009]

As described above, according to the present invention, it is possible to detect the presence or absence of illegal wiring of the IC card by detecting the number of rotations of the first feed roller of the telephone. It is possible to prevent electrical signal leakage to the outside and input of unauthorized electrical signals from outside.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a telephone according to an embodiment.

FIG. 2 is a diagram showing an example of an IC card having illegal wiring.

[Explanation of symbols]

 100 Public Phone 101 First Feed Roller 101A, 101B Roller 102 Second Feed Roller 102A, 102B Roller 103 Rotation Speed Detection Unit 104 Contact 105 Contact Pin 106 Card Insertion 110 IC Card

Claims (1)

[Claims] 1. A telephone in a system for utilizing an IC card, which is used by inserting an IC card into a card insertion opening of a telephone and bringing a terminal of the IC card into contact with a contact pin of the telephone, wherein the IC card is inserted into the telephone. It has a first feed roller that conveys the IC card from the mouth to the inside of the telephone, and a second feed roller that conveys the IC card to the final position where the terminals of the IC card and the contact pins of the telephone can contact each other. When the IC card is inserted from the mouth and used, the IC card reaches the second feed roller, separates from the first feed roller, starts to be conveyed to the final position, and then the first feed roller is used to insert the card. When the number of rotations per specified time is detected by rotating in the direction opposite to the rotation direction and the detected number of rotations per specified time is within the specified value. Only, the telephone is characterized in that the IC card is conveyed to the final position and the contact pin is brought into contact with the terminal of the IC card to perform communication.