JPS6329302B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic information processing method used in banknote identification devices and the like.

Conventionally, magnetic detectors using magnetoresistive elements have been widely used to read characters, symbols, patterns, etc. on banknotes printed with magnetic ink or the like. Figure 1 illustrates the principle of the detection means of a banknote identification device, in which 1 is a magnetic holding medium made of a non-magnetic material such as paper or plastic, and 2a and 2b are fixed on the holding medium 1 by adhesive, printing, etc. It is a magnetic stripe made of magnetic ink, magnetic powder, etc. 3 and 4 are a pair of magnetic resistance elements, and a magnetic stripe 2 is placed on the permanent magnet 5.
a and 2b, and are connected in series as shown in FIG. Here, the state in which the magnetic resistance elements 3 and 4 are attached on the permanent magnet 5 is referred to as a magnetic detector c. The positional relationship between the magnetic detector c and the magnetic stripes 2a and 2b changes relatively at a constant speed, so that the magnetic stripe 2a approaches the magnetoresistive element 3, and the magnetic stripe 2b approaches the opposing surface of the magnetoresistive element 4. In the state where it is not connected, the magnetoresistive element 4
The magnetic flux passing through the magnetoresistive element 3 is larger than that of the magnetoresistive element 3, and as a result, the resistance value of the magnetoresistive element 3 is increased. Considering this state with respect to the voltage dividing circuit shown in FIG. 2, the following equation holds true.

Vout=R ₄ /R ₃ +R ₄ Vin where R ₃ is the resistance value of the magnetoresistive element 3 and R ₄ is the resistance value of the magnetoresistive element 4. From this formula, the resistance value
As the value of R ₃ increases, a voltage lower than the reference voltage 1/2Vin is taken from Vout.

Reference voltage condition: the next A or B state in which equal magnetic bias is applied to the magnetoresistive elements 3 and 4.

A...R _B4 = R _B3 → When the magnetic material (magnetic stripe) is evenly opposed to both magnetic resistance elements 3 and 4, B...R ₄ = R ₃ → There is no magnetic material at all on both magnetic elements 3 and 4. (magnetic stripes) are not facing each other.

Next, magnetic detector c and magnetic stripes 2a, 2
When the relative positional relationship of b changes further and more magnetic flux is applied to the magnetoresistive element 4 than to the magnetoresistive element 3, the resistance value R ₄ of the magnetoresistive element 4 increases,
Vout becomes a voltage higher than the reference voltage 1/2Vin. At this time, the magnetic stripes 2a, 2b and the magnetic detector c
Assuming that the positional relationship advances at a relatively constant speed, the output characteristics are as shown in Figure 3, where the output waveforms S ₁ and S ₂ are relative to the distances l ₁ and l ₂ on the medium 1 in Figure 1. The correspondence relationship can be obtained by However, the magnetic stripes 2a, 2
When the relative speed between b and magnetic detector c changes, for example when using a hand-held scanner or reed pen, the output waveform changes at distances l ₁ and l ₂ on the medium 1, as shown in Figure 4. There was a relationship of t ₁ > t ₂ without relative relationship, and a signal reading error sometimes occurred.

The present invention has been made in view of the above points, and provides a magnetic information processing method that clarifies the range of the basic information signal by providing basic information and pitch information on a holding medium and reading them simultaneously. .

The magnetic information processing method of the present invention is illustrated in FIGS. 5 to 8 below.
This will be explained in detail with reference to the drawings.

FIG. 5 is a basic principle configuration diagram used in the magnetic information processing method of the present invention, and in the same figure, 6a, 6
b, 6c, and 6d are basic information magnetic stripes, and 7 is basic information magnetic stripes 6a to 6.
The magnetic stripes for pitch information are provided so as to be close to b and extend continuously in the arrangement direction to clarify the range in which the magnetic strips 6a to 6d for basic information exist, each of which is made of a magnetic material and is held. They are placed side by side on a medium (not shown) without changing their relative positional relationship. Reference numerals 8a and 8b denote a pair of magnetoresistive elements constituting a magnetic detector, and magnetic field applying means, such as a permanent magnet or an electromagnetic coil, are not shown.

In such a configuration, the operation using the pitch information magnetic stripe 7 will be explained. Figure 6 shows a pitch information magnetic stripe 7 and a pair of magnetoresistive elements 8.
a and 8b indicate relative positional changes, and the state where the pitch information magnetic stripe 7 faces only the magnetoresistive element 8b is T 1 , and the state where the magnetic stripe 7 for pitch information is opposed only to the magnetoresistive element 8b is indicated by T ₁ .
The state in which the pitch information magnetic stripe 7 faces a and _8b is represented by T2, and the state in which the pitch information magnetic stripe 7 faces only the magnetoresistive element 8a is represented by _T3 . Here, the magnetoresistive elements 8a, 8
The connection b corresponds to that shown in FIG. 2, and the magnetoresistive element 8a is replaced by the magnetoresistive element 3 shown in FIG. 2, and the magnetoresistive element 8b is replaced by the magnetoresistive element 4. The output voltage in such a state is as follows.

For T ₁ ...1/2Vin+α, (R _8a < R _8b ) For T ₂ ...1/2Vin, (R _8a = R _8b ) For T ₃ ...1/2Vin-α, (R _8a > R _8b ) However, R _8a is the resistance value of the magnetoresistive element 8a, R _8b
is the resistance value of the magnetoresistive element 8b, and α is the voltage change. In this case, _the output waveform corresponds to the dimension l _{3 of} the pitch information magnetic stripe 7, as shown in FIG. The state of the pair is maintained regardless of the speed). That is, when the magnetic detector moves relatively in the longitudinal direction of the pitch information magnetic stripe 7, the start signal t _P1 is generated at the tip of the pitch information magnetic strip 7, and the termination signal _P1 is generated at the end. do.

Figure 8 shows magnetic stripes 6a to 6 for basic information.
d and the pitch information magnetic stripe 7 are combined. The pitch information signals t _P1 and _P1 are generated by the pitch information magnetic stripe 7, and the basic information signals t _j1 , t _j2 , t _j3 and t _j4 are generated by the basic information magnetic stripes 6a to 6d. t _j1 to t _j4 constitute a positive and negative waveform pair, and t _j1 and
t _P1 occurs before and after the basic information signals 6a to 6d,
The range of basic information signals is clarified. That is, only the basic information signal between the pitch information signals t _P1 and _P1 is a valid signal.

As described above, according to the magnetic information processing method of the present invention, basic information and pitch information are provided on the medium and read simultaneously by a magnetic detector, and the range of the basic information signal that is effective in the pitch information signal is determined. This makes it possible to accurately determine the meaning of the basic information no matter how the relative velocity of the medium to the magnetic detector changes.

Therefore, if the method of the present invention is applied to, for example, a magnetic card, by adding a dummy magnetic stripe, it is possible to obtain a highly confidential information processing method.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a well-known detection means for reading magnetic stripes, and FIG. 2 is a wiring diagram showing the connection state of a magnetoresistive element used in the detection means.
FIG. 3 is a diagram of the output characteristics generated by the detection means at a relatively constant speed, FIG. 4 is a diagram of the output characteristics when the relative speed changes, and FIG. 5 is a diagram of the output characteristics used in the magnetic information processing method of the present invention. FIG. 6 is an explanatory diagram showing the positional relationship between the pitch information stripe and the magnetoresistive element pair, and FIG. 7 is an output characteristic diagram in the positional relationship shown in FIG. 6.
FIG. 8 shows an output characteristic diagram of a combination of pitch information stripes and information magnetic stripes. 6a, 6b, 6c, 6d...Magnetic stripe for information (board information), 7...Pitch information stripe,
8a, 8b... Magnetoresistive elements.

Claims (1)

[Claims] 1 Arrange basic information on a medium, provide pitch information that extends continuously in the direction in which the basic information is arranged, and provide adjacent to the basic information, and connect these two pieces of information to a pair of magnetoresistive elements that constitute a voltage divider circuit. 1. A magnetic information processing method, characterized in that a predetermined basic information signal is generated during a period between a start signal and an end signal of the pitch information.