JPH043283A - Magnetic recording card - Google Patents

Abstract

PURPOSE:To constitute the card so that security information, etc., recorded on a fixed information recording layer are invisible, and also, the information cannot be rewritten by putting a specific pattern to the fixed information recording layer by a material for varying intensity of a magnetic field. CONSTITUTION:On a fixed information recording layer 3, a specific pattern 31 is formed by a material for varying intensity of a magnetic field, and by this pattern 31, security information, etc., are shown. The pattern is put at the time of manufacturing a magnetic recording card 1, it becomes read only, and rewriting of information is impossible. Also, when the pattern 31 is formed by a material of high magnetic permeability and low coercive force, the pattern is not magnetized even at the time of writing data in a magnetic recording layer 4, and it is invisible even if a magnetic contrast-medium and a magnetic viewer, etc., are used. In such a way, the magnetic recording card 1 which is not easily visible as security information, and also, in which unrewritable fixed information is recorded can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application J] The present invention relates to a magnetic recording card on which read-only fixed information used as security information and the like is recorded in addition to data recorded by ordinary magnetic means.

[Prior Art] Security information such as an ID number and data indicating the type of magnetic recording card is recorded on magnetic recording cards generally used as credit cards, prepaid cards, etc. to prevent forgery, tampering, etc. .

Conventionally, the above-mentioned security information has been magnetically recorded on a magnetic recording layer in the same way as data regarding monetary payments and frequency of use.

[Problems to be Solved by the Invention] However, with the conventional magnetic recording cards in which security information is magnetically recorded as described above, the security information cannot be easily recognized visually using magnetic contrast agents, Magnepure, etc. Ta. Furthermore, since it was recorded magnetically, it was easy to rewrite the security information. For this reason,
The security information itself can be easily read and written to other magnetic recording cards, and is not very effective in preventing forgery or tampering with magnetic recording cards.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and provide a magnetic recording card that records fixed information that cannot be easily recognized or rewritten as security information.

[Means for Solving the Problems] In order to achieve the above object, the invention of item 1 comprises a magnetic recording layer for magnetically recording data and a fixed information recording layer for recording read-only fixed information. The fixed information recording layer is characterized by forming a specific pattern using a material that changes the strength of a magnetic field.

The invention of paragraph 2 is based on the invention of paragraph 1, in which the fixed information record MW is
It features a specific pattern printed with ink containing a material that changes the strength of the magnetic field.

The invention set forth in item 3 is characterized in that in the invention set forth in item 1, the fixed information recording layer is formed by forming a specific pattern by metal vapor deposition.

The invention set forth in item 1 is characterized in that, in the invention set forth in item 1, the fixed information recording layer is formed by forming a specific pattern using small metal pieces.

[Examples] Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially cutaway perspective view showing a magnetic recording card according to an embodiment of the present invention.

The magnetic recording card l of this embodiment includes a substrate 2, a fixed information recording layer 3 provided on the surface of the substrate 2, a magnetic recording layer 4 provided on the surface of the fixed information recording layer 3, and a magnetic recording layer 4 covered. It consists of a protective layer 5. The fixed information recording layer 3 and the magnetic recording layer 4 are
As shown in the figure, it may be provided on the entire surface of one side of the magnetic recording card 1, or it may be provided on a part of it.For example, a band-shaped fixed information recording layer 3 and a magnetic recording layer 4 may be provided side by side on the surface of the substrate 2. Alternatively, the fixed information recording layer 3 may be provided on one surface of the substrate 2, and the magnetic recording layer 4 may be provided on the other surface of the substrate 2.

The fixed information recording layer 3 has a specific pattern 31 formed by depositing a metal with high magnetic permeability such as iron, nickel, or an alloy thereof. As a result, the magnetic flux passing through the fixed information recording layer 3 increases or decreases at the position of the pattern 31, and the strength of the magnetic field changes. The pattern 31, which indicates security information and the like, is attached at the time of manufacturing the magnetic recording card 1, so it is read-only and the information cannot be rewritten. Furthermore, by forming the pattern 31 with a material with high magnetic permeability and low coercive force, the pattern 31 is not magnetized even when data is written to the magnetic recording layer 4, and even when a magnetic contrast agent, Magnepure, etc. is used, the pattern 31 is not magnetized. Information recording using the pattern 31, which cannot be visually recognized, may be performed by using a bar code as shown in the figure, or by storing an arbitrary shape pattern corresponding to each type of magnetic recording card in a reading device and checking the information.

Another method for forming the pattern 31 on the fixed information recording layer 3 is to print the pattern 31 on the fixed information recording layer 3 using an ink containing a material that changes the strength of the magnetic field, such as magnetic powder. Good too.

In addition, small metal pieces are arranged on the fixed information recording layer 3 in a pattern 3.
A similar effect can be obtained by forming 1. In addition, any method may be used as long as the pattern 31 is formed using a material that can change the strength of the magnetic field. is written. These data are read and written using magnetic heads as usual.

The protective layer 5 has a pattern drawn on its surface or is made of an opaque material so that the fixed information recording layer 3 and the magnetic recording layer 4 cannot be visually recognized.

Next, the operation of reading information recorded on the fixed information recording layer 3 of the magnetic recording card 1 constructed as described above will be explained.

FIG. 2 schematically shows a reading device for reading information from the fixed information recording layer 3.

The reading device of this embodiment includes a magnet 11 that applies a magnetic field to the magnetic recording card 1, and a magnetic sensor (a magnetoresistive element, a Hall element, etc.) that detects the strength of the magnetic field that has passed through the magnetic recording card 1.
12, an amplifier 13 that amplifies the detection signal from the magnetic sensor 12, a binarization circuit 14 that binarizes the detection signal amplified by the amplifier 13, and a binarization signal output from the binarization circuit 14. The fixed information recording layer 3 includes a CPU 15 that detects patterns provided on the fixed information recording layer 3 and reads information.

When the magnetic recording card 1 is inserted into the reading device constructed as described above, a magnetic field is applied to the magnetic recording card 1 by the magnet 1. Then, the magnetic field transmitted through the magnetic recording card 1 is detected by the magnetic sensor 12. At this time, at the position of the pattern 31 of the fixed information recording layer 3, the magnetic flux transmitted by the pattern 31 increases or decreases, so that the strength of the magnetic field changes. Therefore, if the detection signal from the magnetic sensor 12 is binarized by the binarization circuit 14, a read signal as shown in FIG. 3 is obtained. The CPU 15 receives this read signal, detects the pattern 31, and reads the security information etc. recorded on the fixed information recording layer 3.

In addition, when applying a magnetic field to the fixed information recording layer 3, the magnet work 1
Regarding the magnetic field generated on the same side as the pattern 31, the strength of the magnetic field changes depending on the position of the pattern 31. Information recorded in the fixed information recording layer 3 can also be read by detecting changes in the strength of this magnetic field.

[Effects of the Invention] As explained above, the magnetic recording card of the present invention includes a magnetic recording layer for magnetically recording data and a fixed information recording layer for recording read-only fixed information. By applying a specific pattern to the recording layer using a material that changes the strength of the magnetic field, the security information recorded on the fixed information recording layer cannot be seen even with magnetic contrast agents or Magnepure, and the information Since it cannot be rewritten, it is effective in preventing counterfeiting and tampering of magnetic recording cards.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing a magnetic recording card according to an embodiment of the present invention, and FIG. 2 shows a schematic configuration of a reading device for reading information recorded on the fixed information recording layer of FIG. 1. Block Diagram FIG. 3 is a chart showing read signals read by the reading device of FIG. 2. 1: Magnetic recording car 1 2: Substrate 3: Fixed information recording M 4: Magnetic recording layer 5: Protective layer
31: Pattern applicant: Shiniskei Nippon Card Center Co., Ltd. 4th No. 2 Figure/11/Figure

Claims (4)

[Claims] (1) It is equipped with a magnetic recording layer that magnetically records data and a fixed information recording layer that records read-only fixed information, and the fixed information recording layer is made of a material that changes the strength of the magnetic field. A magnetic recording card characterized by forming a pattern. (2) The magnetic recording card according to claim 1, wherein a specific pattern is printed on the fixed information recording layer using ink containing a material that changes the strength of the magnetic field. (3) The magnetic recording card according to claim 1, wherein the fixed information recording layer is formed by forming a specific pattern by metal vapor deposition. (4) The magnetic recording card according to claim 1, wherein the fixed information recording layer is formed by forming a specific pattern using small metal pieces.