JPH06290310A - Card reader/writer device - Google Patents

Abstract

PURPOSE:To provide a compact and inexpensive card reader/writer device by using a magnetic head which performs the recording/reproducing operations on a 2nd magnetic layer and also erases the remaining data on a 1st magnetic layer when the information is recorded and reproduced through the 2nd magnetic layer to eliminate an exclusive magnetic head that erases the data remaining on the 1st magnetic layer. CONSTITUTION:The data are recorded on a 2nd magnetic layer 12B via a 1st magnetic layer 12A when the data are recorded on a magnetic card 12. Under such conditions, the recording tracks remain on the layer 12A and a faint alternate current of high frequency is supplied to the recording coil of a magnetic head 10, to erase the remaining data on the layer 12A. When the data recorded on the layer 12B are reproduced, a weak current is supplied to the recording coil of the head 10 so that the data recorded on the layer 12B are floated onto the layer 12A and then reproduced by the head 10. These floated data remain on the layer 12A as they are and, therefore, a faint current of high frequency is supplied to the recording coil of the head 10 to erase the remaining data out of the layer 12A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a card reader / writer device for recording and reproducing information on a magnetic card having a first magnetic layer for magnetic shielding and a second magnetic layer for recording information laminated. .

[0002]

2. Description of the Related Art As shown in FIG. 3, there is a magnetic card in which a first magnetic layer 12A and a second magnetic layer 12B are laminated on a substrate 12C in this order from the surface. Here, the data is actually recorded on the second magnetic layer 12B, and the first magnetic layer is used for magnetically shielding the data recorded on the second magnetic layer. When recording data on such a magnetic card, the data is recorded on the second magnetic layer 12B via the first magnetic layer 12A. When reproducing the data recorded in the second magnetic layer, a weak current is applied to the recording coil of the magnetic head to reproduce the data of the second magnetic layer 12B in the first magnetic layer 12A before reproducing the data. And then reproduced by a magnetic head.

By the way, when the data is recorded on the second magnetic layer 12B, a recording mark remains on the first magnetic layer 12A, and when the data is reproduced, the floated data remains as it is on the first magnetic layer 12A. Since it remains in the layer 12A, conventionally, an AC current is passed through the coil of a magnetic head exclusively for erasing to demagnetize the AC to erase the data.

FIG. 4 is a diagram showing a data recording / reproducing operation for such a magnetic card, and the surface of the magnetic card 12 is on the lower side in FIG. 10 is the second
Magnetic head for recording / reproducing data on / from the magnetic layer of
Reference numeral 1 is an erase-only magnetic head for erasing data in the first magnetic layer.

[0005]

In such a card reader / writer device, the data remaining in the first magnetic layer when the data is recorded / reproduced on / from the second magnetic layer of the magnetic card. In order to erase the data, a dedicated magnetic head is required, and there is a problem that the device cannot be made compact and economical. Further, when erasing the residual data of the first magnetic layer, this magnetic head may also erase the data of the second magnetic layer. Therefore, it is necessary to adjust the gap between the magnetic card and the head and adjust the gap of the head itself. There is also a problem that the device becomes more expensive, such as having to devise a special head.

Therefore, it is an object of the present invention to eliminate the dedicated magnetic head for erasing the residual data of the first magnetic layer and to make the apparatus compact and economical.

[0007]

In order to solve such a problem, the present invention performs recording / reproducing of information to / from a second magnetic layer of a magnetic card having a first magnetic layer and a second magnetic layer. The second magnetic layer is provided with a magnetic head for erasing the information remaining in the first magnetic layer when the information is recorded and reproduced.

[0008]

The magnetic head records / reproduces information on / from the second magnetic layer on the magnetic card and erases information remaining on the first magnetic layer when recording / reproducing information on / from the second magnetic layer. To do. As a result, a dedicated magnetic head for erasing the information remaining on the first magnetic layer becomes unnecessary, and the device can be made compact and economical.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a card reader / writer device according to the present invention. In the figure, 1 is a CPU that controls the entire apparatus, 2 is a ROM that stores a program executed by the CPU 1, 3 is a RAM that stores temporary data, and 4 is a data storage that retains data even during a power failure. This is an E ² PROM that can be programmed and erased.

Further, 5 is a hard timer, 6 is an I / O unit,
Reference numerals 7 and 9 are drivers, 8 is a motor, and 10 is a magnetic head. Further, as shown in FIG. 3, reference numeral 12 is a first magnetic layer 12A which is a magnetic shield layer in order from the surface, and a second data recording layer.
The magnetic layer 12B is a magnetic card laminated on the base material 12C.

When the magnetic card 12 is inserted into the card reader / writer device, the CPU 1 controls the driver 7 through the I / O unit 6 to drive the motor 8 to move the magnetic card 12 to the magnetic head 10. To the position. When the magnetic card 12 reaches the position of the magnetic head 10, the CPU 1 drives the magnetic head 10 by controlling the driver 9 via the I / O unit 6, and the card magnetic 1
The data No. 2 is reproduced by the magnetic head 10. The data of the card 12 thus reproduced is taken in by the CPU 1 and sent to the main body control unit (not shown). When receiving a data recording instruction for the magnetic card 12 from the main body control unit, the CPU 1 controls the driver 9 via the I / O unit 6 and causes the magnetic head 10 to record data on the magnetic card 12.

A magnetic card 1 of such a magnetic head 10
The recording / reproducing of the data for 2 is performed as follows. That is, when data is recorded on the magnetic card 12, the data is recorded on the second magnetic layer 12B via the first magnetic layer 12A shown in FIG. And in this case,
Since a recording mark remains on the first magnetic layer 12A, a weak and high-frequency AC current is passed through a recording coil (not shown) of the magnetic head 10 to erase the residual data on the first magnetic layer 12A.

The second magnetic layer 12 of the magnetic card 12 is also used.
When reproducing the data recorded in B, a weak current is passed through the recording coil of the magnetic head 10 to reproduce the data of the second magnetic layer 12B on the first magnetic layer 12A before reproducing the data. Playback is performed by the magnetic head 10. Further, even when the data is reproduced, the floated data remains on the first magnetic layer 12A as it is, and thus a weak and high-frequency alternating current is applied to the recording coil of the magnetic head 10 to cause the first magnetic layer 12A to pass through the first magnetic layer 12A. Erase residual data in layer 12A.

As described above, when data is recorded on the second magnetic layer, residual data generated in the first magnetic layer is erased by the same magnetic head 10, and when the residual data is erased, the magnetic head 10 is used. Since a weak and high-frequency alternating current is applied to the recording coil, the data recorded in the second magnetic layer is not erased.

FIG. 2 shows a magnetic card 12 of the magnetic head 10.
FIG. 7 is a diagram showing a data recording / reproducing operation for the data. In addition,
The surface of the magnetic card 12 shows the lower side in the figure. That is, the first magnetic layer 12A shows the lower side and the base material 12C shows the upper side. The operation of the apparatus of the above embodiment will be described in more detail with reference to this explanatory diagram. When reproducing the data of the second magnetic layer 12B, as shown in FIG. 2A, the magnetic card 12 is conveyed to the position of the magnetic head 10, and then the recording coil of the magnetic head 10 is DC biased (that is, weak). A direct current) is applied to make the data of the second magnetic layer 12B float on the first magnetic layer 12A. And then
As shown in FIG. The magnetic card 12 is conveyed in the opposite direction, and the data floating on the first magnetic layer 12A is read by the reproducing coil in the magnetic head 10 and reproduced.

When rewriting the data of the second magnetic layer 12B, as shown in FIG. 2 (c), the magnetic card 1 is used.
2 to the position of the magnetic head 10 and the first magnetic layer 1
In order to write the data to the second magnetic layer 12B through 2A, a strong current corresponding to the data is applied to the recording coil of the magnetic head 10 to record the data. After that, Figure 2
As shown in (d), after the magnetic card 12 is fed in the reverse direction, the magnetic card 12 is conveyed to the position of the magnetic head 10, and the recording coil of the magnetic head 10 is again DC biased to perform the recording. The data of the second magnetic layer 12B is floated on the first magnetic layer 12A.

Although not shown, the floating data on the first magnetic layer 12A is reproduced by a reproducing coil to determine whether or not the data recorded on the second magnetic layer 12B is normally recorded. to decide. At this time, during normal writing, a high-frequency AC weak current is applied to the recording coil of the magnetic head 10 as shown in FIG.
The data floating on the magnetic layer 12A is erased. After that, the magnetic card 12 is ejected as shown in FIG.

[0018]

As described above, according to the present invention, information is recorded / reproduced on / from the second magnetic layer on the magnetic card having the first and second magnetic layers, and at the same time, the second magnetic layer is formed. By providing the magnetic head for erasing the information remaining in the first magnetic layer during the recording / reproducing of the information with respect to, the dedicated magnetic head for erasing the information remaining in the first magnetic layer becomes unnecessary, Therefore, there is an effect that the device can be constructed compactly and economically.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a card reader / writer device according to the present invention.

FIG. 2 is an explanatory diagram showing an operation of recording and reproducing information on a magnetic card of the above apparatus.

FIG. 3 is a diagram showing a configuration of a magnetic card used in the above apparatus.

FIG. 4 is an explanatory diagram showing a recording / reproducing operation by a conventional card reader / writer device.

[Explanation of symbols]

1 CPU 2 ROM 3 RAM 4 E ² PROM 5 Hard Timer 6 I / O Unit 7, 9 Driver 8 Motor 10 Magnetic Head 12 Magnetic Card 12A First Magnetic Layer 12B Second Magnetic Layer 12C Base Material

Claims (1)

[Claims] 1. A card reader / writer device for recording and reproducing information on and from a magnetic card in which a first magnetic layer for magnetic shielding and a second magnetic layer for recording information are stacked in order from the surface. A magnetic head is provided for recording / reproducing information on / from the second magnetic layer and erasing the information remaining on the first magnetic layer when recording / reproducing information on the second magnetic layer. Card reader / writer device.