JPS6230171Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a magnetic card device that performs writing and reading operations on a magnetic card having a magnetic stripe affixed thereto, particularly a magnetic card having the magnetic stripe affixed at the same position on the front and back surfaces.

First, Figure 1 shows the writing of a conventional magnetic card device.
An example of a reading section is shown. In FIG. 1, 1 is a magnetic head, 2 is a magnetic card, and 3 is the magnetic card 2.
This is a pressure roller for pressing the magnetic head 1 against the magnetic head 1.

On the other hand, the magnetic card 1 generally has a magnetic stripe on only one side, but in the future magnetic stripes will be affixed on both sides, one side will be used as a bank card, etc., and the other side will be used as a POS (point of sale) card.
It is conceivable that the system could be used as a credit card. By the way, there is a JIS standard for the position of the magnetic stripe on a magnetic card, and if the magnetic stripe is provided on both sides according to this standard, the positions of the two will overlap each other.

When such a magnetic card is inserted into the magnetic card device and a write operation is performed, the magnetic stripe 5 on the back side is demagnetized under the influence of the write magnetic field on the magnetic stripe 4 on the front side, as shown in FIG. The reading margin of the magnetic stripe 5 may be reduced.

The purpose of this invention is to eliminate the influence of the write magnetic field on one magnetic stripe on the other magnetic stripe in a magnetic card that has magnetic stripes at the same position on both the front and back sides as described above. A magnetic material with a small coercive force is used for a pressing member such as a pressing roller for pressing against a magnetic head.

The present invention will be explained below with reference to the drawings.

FIG. 3 is an enlarged view of the writing section of one embodiment of the present invention.

Although only a portion of the pressure roller 3 that presses the magnetic card 2 against the magnetic head 1 is shown, the outer peripheral portion 6 that contacts the magnetic card 2 is made of a magnetic material with low retention properties. Therefore, in the portion of the stripe 5 on the back side that contacts the pressure roller 3, the magnetic flux generated by the magnetic information recorded on the magnetic stripe 5, that is, the magnetic flux generated from the magnetic pole N, passes through the outer peripheral portion 6 and enters the magnetic pole S. A road is created. Therefore, even if placed in an external magnetic field due to a write current, no magnetic pole is generated that would produce a magnetic field in the opposite direction that would reduce the magnetic field of the magnetic stripe 5, that is, a demagnetizing force, and the magnetic stripe 5 becomes difficult to demagnetize. Furthermore, since the coercivity is small, the residual magnetism in the outer circumferential portion 6 due to the magnetic stripe 5 does not have a sufficient influence to disturb the magnetically recorded information.

Therefore, even if a write operation is performed on the magnetic stripe 4 or 5 on one side of the magnetic card 2, the influence of the write magnetic field on the magnetic stripe 5 or 4 on the other side is significantly reduced.

In the above embodiment, only the outer peripheral portion of the pressure roller 3 is made of a magnetic material, but the entire pressure roller 3 may of course be made of a magnetic material. In addition, the pressing body that presses the magnetic card against the magnetic head can be not only a roller but also a plate block or belt.
It goes without saying that a similar effect can be achieved with a plate block or belt.

As explained above, according to the present invention, the magnetic stripe on one side of the magnetic card will not be demagnetized by the write magnetic field for the magnetic stripe on the other side, so the read margin will not decrease and the magnetic stripe will not be demagnetized by the magnetic stripe on the other side. This has the effect of stabilizing the card reading operation.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conventional example, FIG. 2 is an explanatory diagram of problems in the conventional technology, and FIG. 3 is a diagram showing an embodiment of the present invention. 1...Magnetic head, 2...Magnetic card, 3...
Pressure roller, 4, 5... Magnetic stripe, 6...
The outer periphery of a magnetic material with low coercive force.

Claims (1)

[Scope of utility model registration request] In a magnetic card device for writing and reading a magnetic card having magnetic stripes at the same position on both sides, at least a portion of a pressing member that presses the magnetic card against a magnetic head, which contacts the magnetic stripe, is made of a magnetic material with low retentivity. , a magnetic card device that protects magnetic information recorded on the magnetic stripe.