JPS58111130A - Magnetic recording medium - Google Patents

Abstract

PURPOSE:To obtain a magnetic card on which unfair recording is made difficult, by providing a read-only area converted into a permanent magnet, and an area free in change of recording. CONSTITUTION:A piece of permanent magnet 2 is buried by pressing it into a card, in the longitudinal insertion or conveyance direction C of the card in front of C to form a read-only area A, and on the same line, an area B consisting of a rewritable magnetic stripe. For example, 2 kinds of said pieces 2 are provided, the wider one expresses code ''0'', and the narrow one code ''1'', and these pieces are properly combined in accordance with the encoded data of what is to be recorded, and arranged in a line. The distance between adjacent 2 pieces 2 express data, the wider one expressing ''0'', the narrower one ''1'', respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to magnetic recording media, such as magnetic cards.

Magnetic cards are used in the financial industry to confirm the authenticity of customers conducting transactions at automatic teller machines and other transaction processing devices, and are used in locks in various buildings, and in many other public-funded transactions. It has become widely used and used for various purposes. In any case, the person who owns a magnetic card is assumed to have some kind of legitimate authority, and magnetic cards are increasingly being treated as collateral for property and credit. Therefore, if a magnetic card is forged and used illegally, the damage will be enormous.

However, in recent years, as encoders that write data onto magnetic cards have become commercially available and easily available, the problem has arisen that it is relatively easy to create illegal cards. .

An object of the present invention is to provide a magnetic recording medium such as a magnetic card that is extremely difficult to create illegally.

The magnetic recording medium according to the present invention has a reading scanning direction of -
It is characterized by having a read-only area where the magnetic distribution representing the scale and data is made into a permanent magnet, and a rewritable area.

Predetermined data is recorded in the read-only area by, for example, embedding a permanent magnet piece. In this case, in order to make the embedded permanent magnet piece invisible to the naked eye, it may be made into a permanent magnet while writing opaque scissors on its surface, or it may be made into a permanent magnet after writing. The rewritable area can be constructed of, for example, a regular magnetic stripe.

Since the magnetic recording medium according to the present invention is provided with a read-only area that is made into a permanent magnet, it is almost impossible to rewrite the data in this area. is extremely difficult to forge. In addition, special equipment is required to write permanent magnetized data onto magnetic recording media.
It is also difficult to create new illegal magnetic recording media.

In such magnetic recording media, data can be recorded at extremely high density in writable areas such as magnetic stripes, but in read-only areas such as embedded permanent magnet pieces. It is very difficult to increase the data recording density, and generally the data recording densities of the two areas are different. Therefore, it is impossible for conventional magnetic reading devices to read the magnetic recording medium according to the present invention.

A magnetic reader that reads such a magnetic recording medium in which recording areas with high data recording densities are divided and controlled in the reading scanning direction uses a clock signal with a different frequency depending on the recording density of each recording area. A circuit that generates pulses, a magnetic head that reads data recorded in these recording areas, a circuit that shapes the required read signal from the output signal of the magnetic head, and an area where the frequency of the clock pulse is read. Preferably, the device comprises means for switching in response to the clock pulse, and a circuit for converting the read signal into a data signal in response to the switched clock pulse.

This magnetic reading device has a simple configuration because the magnetic head and signal shaping circuit can be used in common for each recording area.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a magnetic card and an example of a magnetic reader for reading this magnetic card will be described in detail below with reference to the drawings.

In FIG. 1, a read-only area IA) and a rewritable area IBI are provided in a straight line in the longitudinal direction of a magnetic card (1). The read-only area IAI is located at the front in the insertion or transport direction () of the card (1), and the area IBI is located at the rear. Ellie? (A) is embedded by press-fitting the permanent magnet piece (21) into the card.The permanent magnet piece (2) has a wide width (
There are two types: a narrow one (representing code 0) and a narrow one (representing code I), and these magnet pieces t21 are appropriately combined and arranged in a line according to the coded data to be written in the area tAl. The distance between adjacent magnet pieces (21" also represents data, a wide interval represents 0, and a narrow interval represents 1. The permanent magnet piece (2) is placed on the surface of this area) so that it cannot be seen. It is preferable to form an opaque thin film on the area (B), and a magnetic stripe (3) is attached to the area (B).
) has the required data recorded.

If the card (1) is manually scanned, it is preferable to provide an area parallel to area IA)tBl for recording reference data for generating timing pulses.

FIG. 2 shows a magnetic card reading device for reading data recorded on this card (1), and FIG. 3 shows each output signal waveform in this device. In the process of transporting the card (1), data in areas IAI IB) is read by the magnetic head αυ. The output signal (aJ) of the magnetic head αD is sent to the differential shaping circuit α, and the signal (a) is differentiated to become the signal (bl), which is further waveform-shaped to become the signal (+11). , the falling detection circuit α suddenly detects the rising edge'), and the falling edge is detected, resulting in a read signal +d).This read signal 1dl is input to the F2F conversion circuit (141).

This magnetic card reading device is provided with two clock pulse generation circuits a90e. The clock pulse generation circuit O5 generates a clock pulse (.) for reading data in the area tA), and this clock pulse (.) is a clock pulse (.) for reading the permanent magnet piece +21 representing 0. T1), and the period is equal to T1).
This is a pulse signal with a factor of 174. The clock pulse generation circuit αe generates a clock pulse (f) for reading data in area IB), and this clock pulse lf) represents 0 recorded on the magnetic stripe (3). It is a pulse signal with a period equal to the reading time cT2) of data 1 and a duty factor of 174. These clock pulses (・) (f)
are respectively sent to the gate circuit t1n(2). The gate circuit 090 seconds is controlled by the switching signal (g) output from the central processing unit (CPU) (2G. When the switching signal 1g) is at H level, the gate of the gate circuit αQ is opened and the signal ( g) is input to the gate circuit surface via the N07 circuit (21), so when the signal (gl) is at L level, the gate of this circuit (1?) is open (signal). Gate circuit αη
or the clock pulse te+ or i that passed through α−
f) is passed through the OR circuit-9 and output as the signal 1hl to CP.
Input U(ill and F2F conversion circuit circle).

The F2F conversion circuit determines the period (T1) or (T2) based on the input read signal (d) and controls the generation circuit (to) αe, and also determines the period (T1) or (T2) based on the input read signal (1d). A read data signal If) is output. When the pulse period of the read signal (d) is (T1), the data signal is at H level, and the period is (Tl/2).
), the signal lit becomes L level. This data signal 1i1 is input to the CPU ■. At the rising edge of the input clock signal (hl), the CPUaKI reads the state (H level or L level) of the data signal (i) and obtains the final data. When the data signal is at the H level, the data is 0; The data is 1 when it is at L level.

FIG. 4 shows the reading process by the CPU (2G).

When a read start signal is input from the magnetic head αυ or card detector, the read bit counter (CO
N) is cleared (step Cl1), and the switching signal (g
) is set to L level (step). This read bit counter counts the number of bits of data recorded in area tA.
Let N be the number of data bits of l.

CPUCl! When the clock signal th input to Ql goes from the L level to the H level (step 1), the data signal (tt) at that point is read (step (to)) and the contents of the read bit counter (C, ON) are sufficient. 1 (step C16)).Then, it is checked whether the reading is completed (step @) and whether the contents of the counter (CON) have reached N (step @). This is determined from whether the card detector detects no card or from other signals.If reading is not completed and the contents of the counter (CON) have not reached N, the process returns to step (to). Go back and step (toward) ~
The process (to) is repeated.

When the number value of the rod reading bit counter (CON) reaches the limit (step), the switching signal tg is inverted to H level (step 31), and the program returns to the Stellar mode again. When the 4 values of the counter (CON) reach N, the reading of the area tAl is completed and the area (B) is read.
Proceed to reading. Then, the processing from steps (1) to (to) is repeated. When the reading of area IB) is completed at step position, all processing is completed.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the configuration of a magnetic card, Fig. 2 is a block diagram showing a magnetic card reading device, Fig. 3 is a waveform diagram showing the output signal of the direction shown in Fig. 2, and Fig. 4 is a CPU 3 is a flow chart showing the reading process of FIG. (1)...Magnetic card, (2)...Permanent magnet piece, (
3)... Magnetic stripe, (Mul... read-only area, 181... rewritable area. Patent applicant: Tateishi Electric Co., Ltd. Figure 1)

Claims (1)

[Claims] A magnetic recording medium is provided with a read-only area in which the magnetic distribution representing data is made into a permanent magnet and a rewritable area in the read scanning direction of the magnetic recording medium.