JPH09198627A - Magnetic processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic medium writing device capable of automatically writing the wearing of a magnetic head by providing a magnetic writing inspection circuit. SOLUTION: Magnetic information detected by first and second reading heads 3 and 7 is amplified by a magnetic reading amplifier circuit 18 and then read by a magnetic reading control circuit 14. A magnetic writing driver circuit 19 performs writing magnetic information in a magnetic recording medium 1 by a writing head and a magnetic writing circuit 15 controls the magnetic writing driver circuit 19. A magnetic writing inspection circuit 16 is connected to the magnetic writing driver circuit 19 and detects the wearing condition of the writing head 5 by detecting the reactance of the writing head 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic medium writing device for writing magnetic information on a magnetic recording medium.

[0002]

2. Description of the Related Art Conventionally, the state of a magnetic writing head is checked by visual inspection of the head surface, or a writing pattern is obtained by using a magnetic contrast agent or the like on a ticket (medium) written by the magnetic writing head. The method of confirming the information was taken. Since these processing cannot be performed for each ticket processing,
It was carried out after every fixed number of treatments or every fixed time.

There is also a method of detecting the leakage magnetic flux of the magnetic writing head by an external sensor, but in this method, it is necessary to measure the leakage magnetic flux by bringing the position of the magnetic sensor with respect to the writing head close to a fixed distance at the time of measurement. Since it is difficult to inspect every time a ticket is processed, the inspection is performed every time a certain number of sheets are processed or every certain time.

[0004]

In the prior art, when the magnetic sensor is not used, whichever method is used, the state of the magnetic head needs to be visually inspected by a human. It was difficult to automate the work.

Further, it is practically impossible to perform these operations for each processing of the ticket, and it is unavoidable that the operations are performed at a fixed number of processings or at a fixed time.
If there is a sudden problem with the head (such as a missing head), it is more likely that writing will be performed on the ticket in an incorrect state, and a reading failure will be induced by the ticket that was written in a defective state. The possibility of doing so also increases.

A defect such as a chipped head may be overlooked by a method of visually inspecting it, and a defective reading may be induced by a ticket written in a defective state. There is also a method of detecting the leakage magnetic flux of the magnetic writing head with an external sensor, but with this method, it is necessary to move the position of the magnetic sensor with respect to the magnetic writing head to a fixed distance at the time of measurement. It is difficult in terms of time and cannot inspect each ticket processing.

Further, this method requires a dedicated magnetic sensor and a mechanism for moving the sensor.
There are difficulties in terms of both life. The present invention has been made in view of the above points, and an object of the present invention is to provide a magnetic medium writing device capable of automatically detecting wear of a magnetic head.

[0008]

According to a first aspect of the present invention, there is provided a magnetic medium writing device, wherein a magnetic head for reading and writing magnetic information stored in a magnetic medium and wear of the magnetic head by detecting reactance of the magnetic head. Wear detecting means for detecting a state is provided.

According to another aspect of the magnetic medium writing apparatus of the present invention,
A magnetic head for reading and writing magnetic information stored in a magnetic medium, a rectangular wave output means for outputting a rectangular wave to the magnetic head, and a current flowing through the magnetic head due to the rectangular wave output from the rectangular wave output means. Wear detecting means for detecting the wear state of the magnetic head by measuring the time taken to rise to a specified value.

According to another aspect of the magnetic medium writing apparatus of the present invention,
Conveying means for conveying a magnetic medium on which a magnetic signal is recorded,
A magnetic head for detecting the magnetic signal conveyed to the conveying means, a magnetic circuit for processing magnetic information detected by the magnetic head, and a reactance of the magnetic circuit to detect the wear state of the magnetic head. Wear detecting means is provided.

According to a fourth aspect of the present invention, there is provided a magnetic processing apparatus which conveys a magnetic medium on which a magnetic signal is recorded, a magnetic head which detects the magnetic signal which is conveyed to the conveying means, and a magnetic head which detects the magnetic signal. A magnetic circuit for processing the magnetic information and a rectangular wave output means for outputting a rectangular wave to the magnetic circuit are provided.

According to another aspect of the magnetic medium writing apparatus of the present invention,
A magnetic head for reading and writing magnetic information stored in a magnetic medium, a square wave output means for outputting a rectangular wave to the magnetic head, and a current flowing through the magnetic head by the rectangular wave output from the rectangular wave output means. Voltage converting means for converting the voltage, amplifying means for amplifying the voltage changed by the voltage converting means, comparing means for comparing the voltage generated by the amplifying means with a reference voltage, and amplified by the amplifying means. Holding means for holding the state until the voltage becomes the reference voltage.

A magnetic medium writing device according to a sixth aspect of the present invention is
A magnetic head for reading and writing magnetic information stored in a magnetic medium, a square wave output means for outputting a rectangular wave to the magnetic head, and a current flowing through the magnetic head by a square wave output from the square wave output means. Voltage converting means for converting the voltage, voltage amplifying means for amplifying the voltage changed by the voltage converting means, smoothing means for smoothing the voltage amplified by the amplifying means, and magnetizing based on the output voltage of the smoothing means. And a detection unit for detecting wear of the head.

A magnetic medium writing device according to a seventh aspect is
A magnetic head for reading and writing magnetic information stored in a magnetic medium, a sine wave output means for outputting a sine wave to the magnetic head, and a sine wave output from the sine wave output means for flowing a current flowing through the magnetic head. Voltage converting means for converting the voltage, voltage amplifying means for amplifying the voltage changed by the voltage converting means, smoothing means for smoothing the voltage amplified by the amplifying means, and magnetizing based on the output voltage of the smoothing means. And a detection unit for detecting wear of the head.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings with reference to FIGS. In FIG. 1, reference numeral 1 is a magnetic recording medium. A transport path 2, a first read head 3, a transport path 4, a write head 5, a transport path 6, a second read head 7, and a transport path 8 are provided from the insertion side of the magnetic recording medium 1. This transport path 8
The magnetic recording medium 1 is ejected from behind.

Next, the system configuration of the magnetic medium writing device will be described with reference to FIG. In FIG. 2, 11
Is a CPU. This CPU 11 has a system bus 12
The memory 13, the magnetic read control circuit 14, the magnetic write control circuit 15, the magnetic write inspection circuit 16, and the conveyance control circuit 17 are connected via the.

The magnetic information detected by the first read head 3 and the second read head 7 is amplified by the magnetic read amplifier circuit 18 and then read by the magnetic read control circuit 14.

The write head 5 writes magnetic information to the magnetic recording medium 1 by the magnetic write driver circuit 19. This magnetic writing driver circuit 19
Is controlled by the magnetic writing circuit 15.

The output of the magnetic writing inspection circuit 16 described above is connected to the magnetic writing driver circuit 19. The detailed configuration of the magnetic write driver circuit 19 will be described with reference to the circuit of FIG.

Reference numeral 20 denotes a transfer motor, which is the transfer path 2,
It is a motor for driving 4, 6, and 8. The transport motor 20 is driven by a transport driver circuit 21.
Next, the magnetic writing inspection circuit 16 will be described with reference to FIG. A test circuit 31 is connected to the system bus 12. As shown in FIG. 4A, the inspection circuit 31 outputs a rectangular wave for each processing of the magnetic recording medium 1. The output of the inspection circuit 31 is A.

The output of the inspection circuit 31 is the first
Is output to the write driver 19 via the wiring 19a and the second wiring 19b. A resistance r is provided on the second wiring 19b. The voltage across the resistor r is output across the amplifier 32. The output of the amplifier 32 is B.

The output of the amplifier 32 is the comparator 3.
3 is input to the + terminal. The reference voltage Vs is input to the negative terminal of the comparator 33. The output A of the inspection circuit 31 is input to one input terminal of the AND circuit 34. The output of the comparator 33 is input to the other input terminal of the AND circuit 34.

Further, the output D of the AND circuit 34 is D
It is input to the gate of the type flip-flop 35. This D
The output of the flip-flop 35 is connected to the system bus 12.

Next, the operation of the first embodiment of the present invention configured as above will be described. When the magnetic recording medium 1 such as a highway card is inserted from the insertion side,
The magnetic recording medium 1 is transported via the transport path 2, the first read head 3, the transport path 4, the write head 5, the transport path 6, the second read head 7, and the transport path 8.

Then, the first read head 3 reads the magnetic information, and the write head 5 updates the magnetic information.
Immediately before the magnetic information is written by the write head 5, a square wave rising from the time To is output to the write head 21 via the write driver 19 in the magnetic write driver circuit 19, as shown in FIG. It

As described above, when the square wave is output from the inspection circuit 31, the output of the amplifier 32 rises as shown in FIG. 4 (B). Then, the output of the AND circuit 34 becomes the "1" level until the output B becomes the voltage Vs. Therefore, when the logical product of the output A of the inspection circuit 31 and the output C of the comparator 33 is calculated, as shown in FIG.
A signal that becomes high level for the time ΔT is output to the D-type flip-flop 35.

That is, as shown in FIG. 5A, when the write head 5 is in a normal state with almost no wear, the reactance of the magnetic circuit including the write head 5 is large, and therefore the time ΔT. Becomes longer.

However, as shown in FIGS. 5 (B) and 5 (C), when the wear of the write head 5 progresses, the write head 5
As the amount of wear increases, the reactance of the magnetic circuit decreases, and the time ΔT decreases.

Therefore, by determining the time ΔT,
The wear state of the writing head 5 can be detected. Next, a second embodiment of the present invention will be described with reference to FIGS. 6 and 7. In FIG. 6, 11 is a CPU. A test circuit 31 is connected to the system bus 12. The inspection circuit 31 outputs a rectangular wave for each processing of the magnetic recording medium 1, as shown in FIG. The output of the inspection circuit 31 is A.

The output of the inspection circuit 31 is the first
Is output to the write driver 19 via the wiring 19a and the second wiring 19b. A resistance r is provided on the second wiring 19b. The voltage across the resistor r is output across the amplifier 32. The output of the amplifier 32 is B.

The output B of the amplifier 32 is smoothed through the smoothing circuit 33. The output C of the smoothing circuit 33 is output to the A / D converter 34. That is, the smoothing circuit 33 converts the output C into digital data.

Next, a second embodiment of the present invention configured as above will be described. When the magnetic recording medium 1 such as a highway card is inserted from the insertion side, the magnetic recording medium 1 is conveyed to the conveying path 2, the first read head 3, the conveying path 4,
It is transported via the write head 5, the transport path 6, the second read head 7, and the transport path 8.

The magnetic information is read by the first read head 3, and the magnetic information is updated by the write head 5.
Just before the magnetic information is written by the write head 5, a rectangular wave is output to the write head 21 via the write driver 19 in the magnetic write driver circuit 19 as shown in FIG. 7A.

By the reactance of the write head 21,
The voltage across the resistor r is output as a sawtooth wave. Then, the sawtooth wave is smoothed by the smoothing circuit 33, converted into digital data by the A / D converter 34, and then outputted to the CPU 11. Here, the smoothing circuit 3
The output C of 3 is the voltage Vr.

That is, as shown in FIG. 5A, when the write head 5 is in a normal state with almost no wear, the reactance is large and the time constant of the output B is large. Therefore, the voltage Vr becomes small.

However, as shown in FIGS. 5B and 5C, as the wear state of the write head 5 advances, the reactance decreases as the wear state of the write head 5 increases. Therefore, the voltage Vr increases.

Therefore, by determining the voltage Vr,
The wear state of the writing head 5 can be detected. Although a highway card is assumed as the magnetic recording medium 1 in the above embodiment, another magnetic recording medium may be used. Further, in the above-described second embodiment, the inspection circuit 13 outputs the rectangular wave, but it may output the sine wave.

[0038]

As described above in detail, according to the present invention, it is possible to provide a magnetic medium writing device capable of automatically detecting wear of a magnetic head.

[Brief description of drawings]

FIG. 1 is a diagram showing an arrangement of a read head and a write head of a magnetic medium writing device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a system configuration of a magnetic medium writing device.

FIG. 3 is a diagram showing a detailed configuration of a magnetic writing inspection circuit 16.

FIG. 4 is a timing chart for explaining the operation of the first embodiment.

FIG. 5 is a diagram for explaining the state of the head.

FIG. 6 is a diagram showing an arrangement of a read head and a write head of a magnetic medium writing device according to a second embodiment of the present invention.

FIG. 7 is a flowchart for explaining the operation of the second embodiment of the present invention.

[Explanation of symbols]

11 ... CPU, 12 ... System bus, 13 ... Memory, 1
4 ... Magnetic read control circuit, 15 ... Magnetic write control circuit,
16 ... Magnetic writing inspection circuit, 17 ... Conveyance control circuit, 1
8 ... Magnetic read amplifier circuit, 19 ... Magnetic write driver circuit, 20 ... Transport, 21 ... Transport driver circuit, etc.

Claims (7)

[Claims] 1. A magnetic circuit including a magnetic head for reading and writing magnetic information stored in a magnetic medium, and wear detecting means for detecting a wear state of the magnetic head by detecting reactance of the magnetic circuit. A magnetic processing device characterized by the above. 2. A magnetic circuit including a magnetic head for reading and writing magnetic information stored in a magnetic medium, a rectangular wave output means for outputting a rectangular wave to the magnetic circuit, and a rectangle output from the rectangular wave output means. A measuring means for measuring the time taken for the current flowing in the magnetic head to rise to a specified value by waves, and a wear detecting means for detecting the wear state of the magnetic head based on the measurement by the measuring means. And magnetic processing equipment. 3. A carrying means for carrying a magnetic medium on which a magnetic signal is recorded, a magnetic head for carrying the magnetic signal carried by the carrying means, and a magnetic circuit for processing the magnetic information detected by the magnetic head. And a wear detecting means for detecting the wear state of the magnetic head by detecting the reactance of the magnetic circuit. 4. A carrying means for carrying a magnetic medium on which a magnetic signal is recorded, a magnetic head for carrying the magnetic signal carried by the carrying means, and a magnetic circuit for processing the magnetic information detected by the magnetic head. And a rectangular wave output means for outputting a rectangular wave to the magnetic circuit. 5. A magnetic head for reading and writing magnetic information stored in a magnetic medium, a rectangular wave output means for outputting a rectangular wave to the magnetic head, and a rectangular wave output from the rectangular wave output means for the magnetic field. Voltage conversion means for converting a current flowing through the head into voltage, amplification means for amplifying the voltage changed by the voltage conversion means, comparison means for comparing the voltage generated by the amplification means with a reference voltage, A magnetic medium writing apparatus comprising: a holding unit that holds a state until the voltage amplified by the amplifying unit becomes a reference voltage. 6. A magnetic head for reading and writing magnetic information stored in a magnetic medium, a square wave output means for outputting a square wave to the magnetic head, and a square wave output from the square wave output means for producing the magnetic field. A voltage converting means for converting a current flowing through the head into a voltage, an amplifying means for amplifying the voltage changed by the voltage converting means, a smoothing means for smoothing the voltage amplified by the amplifying means, and an output of the smoothing means. A magnetic medium writing device comprising: a detection unit that detects wear of a magnetic head based on a voltage. 7. A magnetic head for reading and writing magnetic information stored in a magnetic medium, a sine wave output means for outputting a sine wave to the magnetic head, and a sine wave output from the sine wave output means for producing the magnetic field. A voltage converting means for converting a current flowing through the head into a voltage, an amplifying means for amplifying the voltage changed by the voltage converting means, a smoothing means for smoothing the voltage amplified by the amplifying means, and an output of the smoothing means. A magnetic medium writing device comprising: a detection unit that detects wear of a magnetic head based on a voltage.