JPH0246504A - Magnetic card recording and reproducing device - Google Patents

Abstract

PURPOSE:To remove a forged card and to improve the safety by providing first and second current sources to supply the current to record with respective different coersive forces and a control means to control these current sources. CONSTITUTION:For the reproduction of data, a magnetic card and a magnetic head 2 are brought into contact with each other, moved at a constant speed, the magnetic flux change on a magnetic stripe 1, namely, the micro current change to occur at the coil of the magnetic head 2 is detected and as a signal, processing is executed. The data recording to a magnetic card, is executed by flowing a current source to the magnetic head 2, and while the magnetic card is moved at an approximately constant speed, by generating the magnetic flux density change to the magnetic stripe 1. Accordingly, a first current source 3 to generate the current equivalent to the coersive force of about 1000 oersted or below and a second current source to generate the current equivalent to the coersive force of about 2000 oersted or above are provided. First and second current sources 3 and 4 are controlled by a control means 5. Thus, the forged card of a low coersive force, which is comparatively easily forged, is removed and the device with the high accuracy of a security can be obtrained.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to magnetic force and
- This relates to a hard disk recording/reproducing device.

Conventional technology Conventionally, the coercive force of a magnetic card is 30 for an ISO standard card, depending on the magnetic material of the magnetic stripe of the card.
0 oersted (Oe) is the mainstream, JIS standard is 650
Ernuted (Os) is the mainstream 2.\-7, and others are 45o (Oe) and 1750 (Oe).

There were some such as 3000 (Oe). As a magnetic card recording/reproducing device, a current is passed through a magnetic head using one type of current source corresponding to each coercive force to perform recording on a magnetic card.

Problems to be Solved by the Invention However, genuine magnetic cards (particularly magnetic cards with a coercive force of 650 (Oe) or less) may be tampered with due to the material, and if a fake card is used, There was a problem in that if the written tampered data was in a predetermined format, the card would be treated as a legitimate card. Prevention is relatively easy in the case of a recording/reproducing device that is connected to a computer online, but it is difficult in the case of an offline device.

Four Ways to Solve the Problems In order to solve the above problems, the magnetic card recording and reproducing device of the present invention includes a magnetic head for recording and reproducing information on a magnetic card, and a magnetic head that records information with a coercive force of about 1000 Oe or less. a first current source that supplies a current for recording to the magnetic head with a coercive force of approximately 200 Q Oersteds or more; and control means for controlling the current source.

Operation: First, a low current is applied to the magnetic head to erase data on cards (low coercive force cards) other than the specified card (high coercive force card), then the data on the specified card is read, and after data processing, a high current is applied. to write data.

In other words, if you record arbitrary data by applying a current equivalent to a coercive force of 100o (Os) to a magnetic head, the data already recorded on the magnetic card will be erased with a coercive force less than that, but 1750o (Oe) It utilizes the characteristic that data that has already been recorded with high coercive force such as or 3ooo (oe) remains without being erased. Set the coercive force of the regular card to 1750 (Oe) or 3000 (Oe).

Then, a current equivalent to about 10 QO (Oe) is passed through the magnetic head to erase coercive force data of less than that. At this time, records of tampered cards written at 1000 (Oe) or less are also erased. After that, after reading the card data and processing the data,
A current of (Oe) is applied to record new data.

Embodiment FIG. 1 shows an embodiment of the present invention. Reference numeral 1 is a magnetic null-drive of the magnetic card, and reference numeral 2 is a magnetic head. To reproduce data, a magnetic card and a magnetic head are brought into contact with each other and moved at a constant speed, and changes in magnetic flux on the magnetic stripe, that is, slight changes in current generated in the coil of the magnetic head, are detected and processed as signals. Data is recorded on the magnetic card by passing a current from a current source through the magnetic head and causing a change in magnetic flux density in the magnetic stripe while moving the magnetic card at a substantially constant speed. 3 is a first current source that generates a current equivalent to a coercive force of about 10,000 e or less, and 4 is a second current source that generates a current equivalent to a coercive force of about 200,000 or more. The first current source 3 and the second current source 4 are controlled by a control means 5.

5, <.

Next, in the schematic diagram of the magnetic card recording/reproducing device 6 shown in FIG. 2, the magnetic card 8 inserted from the insertion lower is conveyed by a drive roller 9, and the magnetic head 2 performs side recording/reproduction. The control of the magnetic head 2 is transmitted to and controlled by the main control device 12 via the printed circuit board 10 and the cape/L'11.

Effects of the Invention As described above, according to the present invention, counterfeit cards with low coercive force that are relatively easy to modify can be eliminated, and a device with high security can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a magnetic card recording/reproducing apparatus showing an embodiment of the present invention, and FIG. 2 is a schematic sectional view of the same magnetic card recording/reproducing apparatus. DESCRIPTION OF SYMBOLS 1...Magnetic null 1-live, 2...Magnetic head, 3...First current source, 4...Second current source, 5... ... Control means, 6 ... Magnetic card recording and reproducing device, 7 ... Insertion slot, 8 ...
Magnetic card, 9... Drive roller, 1Q...
Printed circuit board, 11... Cable, 126 ・\-
7... Main controller 1-roll device.

Claims (1)

[Claims] a magnetic head for recording and reproducing information on a magnetic card; a first current source that supplies current to the magnetic head for recording with a coercive force of about 1000 Oe or less; and a coercive force of about 2000 Oe or more to the magnetic head. A magnetic card recording/reproducing device comprising: a second current source that supplies a current for recording; and a control means that controls the two series of current sources.