JPH0449502A - Magnetic writer - Google Patents

Abstract

PURPOSE:To magnetically write and erase data on two or more kinds of media having magnetic layers different in coercive force by switching the current supplied to a magnetic write head in accordance with the coercive force of the magnetic medium. CONSTITUTION:The magnetically recorded magnetic medium is closely brought into contact with a magnetic read head 14 and is moved, and thereby, a control circuit 11 receives read data. The control circuit 11 determines erase or write by this data and sends this data to a magnetic write circuit 12. The current value corresponding to the coercive force of the recording medium written in read data is indicated to a current switching circuit 16. Thereafter, data is magnetically erased or written by magnetic recording. Thus, data is magnetically written and erased on magnetic mediums different in coercive force, and a system is easily changed in accordance with improvement of the capacity of magnetic mediums.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic writing device used in a ticket issuing device or the like.

(Prior Art) FIG. 2 is a block diagram showing the configuration of a conventional magnetic writing device.

The illustrated device includes a control circuit 21, a magnetic write circuit 22,
A write head 23, a read head 24, and a magnetic read circuit 2
It consists of 5.

The control circuit 21 includes a processor and the like, and controls the magnetic write circuit 22 and the magnetic read circuit 25.

The magnetic write circuit 22 is composed of a D/A converter, an amplifier, etc., and converts the digital signal output from the control circuit 21 into a change in current.

The write head 23 is composed of a core and a coil, and converts changes in the current output by the magnetic write circuit 22 into changes in magnetism.

Like the write head 23, the read head 24 consists of a core and a coil, and reads magnetic information from a magnetic medium and converts it into a change in current.

The magnetic reading circuit 25 is composed of an A/D converter, an amplifier, etc., and converts the change in current read by the reading head 24 into a digital signal.

Next, the operation of the above-described device will be explained.

The control unit 21 sends data to be recorded on the magnetic medium to the magnetic write circuit 22. The magnetic write circuit 22 modulates the received data and applies current to the write head 23. This generates magnetic flux in the write head 23. Then, magnetic information is recorded on the magnetic layer of the magnetic medium that moves in close contact with the write head 23.

When a magnetically recorded medium moves in close contact with the reading head 24, an electromotive force is generated in the reading head 24.

Then, the current generated by the read head 24 is amplified by the magnetic read circuit 25 and demodulated. When the data thus obtained is transmitted to the control section 21, the control section 21 compares it with the data that should have been written to confirm that the writing has been performed normally.

At this time, the current flowing into the write head 23 has a value that matches the coercive force of the magnetic layer of the magnetic medium.

This value was fixed in advance.

(Problems to be Solved by the Invention) However, the above-described conventional technology has the following problems.

That is, if there are two or more types of magnetic media with different coercive forces, magnetic writing can only be performed on one type of magnetic medium. Further, it is possible to erase magnetic information written on a magnetic medium only for one type of magnetic medium.

Examples of magnetic media include train tickets, airline tickets, etc. As these passports and the like become popular, the coercive force of the magnetic layer has been increased. The reason for this is to better retain information such as passports. However, even if the coercive force of a passport, etc. is increased at a certain time,
Passports with earlier coercive force may coexist. In such cases, magnetic writing and erasing must be performed on magnetic media having multiple types of coercivity.

The present invention has been made with attention to the above points, and provides a magnetic writing device that can perform magnetic writing and magnetic erasing on two or more types of media having magnetic layers with different coercive forces. The purpose is to

(Means for Solving the Problems) A magnetic writing device of the present invention includes a magnetic writing head that writes magnetic information on a magnetic medium, and a current supplied to the magnetic writing head that changes the coercive force of the magnetic medium. The present invention is characterized by comprising a current setting device that sets the current setting device accordingly, and a current switching circuit that switches the current supplied to the magnetic write head according to the setting of the current setting device.

(Function) In the magnetic writing device of the present invention, the current output from the magnetic writing circuit is switched by the current switching circuit according to the coercive force of the magnetic medium. Therefore, the change in the magnetic force output by the write head has a value appropriate to the coercive force of the magnetic medium.

(Example) FIG. 1 is a block diagram showing the configuration of a magnetic writing device of the present invention.

The illustrated device comprises a current setter 10, a control circuit 11, a magnetic write circuit 12, a magnetic write head 13, a magnetic read head 14, a magnetic read circuit 15, and a current switching circuit 16.

The current setter 10 sets the current supplied to the magnetic write head 13 according to the coercive force of the magnetic medium. This setting is
For example, the settings are set in stages of about three stages.

The control circuit 11 includes a processor and the like, and controls the magnetic write circuit 12, the magnetic read circuit 15, and the current switching circuit 16.

The magnetic write circuit 12 is composed of a D/A converter, an amplifier, etc., and converts the digital signal output from the control circuit 11 into a change in current.

The magnetic write head 13 consists of a core and a coil, and converts changes in the current output by the magnetic write circuit 12 into changes in magnetism.

The magnetic read head 14, like the magnetic write head 13,
Consisting of a core and a coil, it reads magnetic information from a magnetic medium and converts it into changes in current.

The magnetic reading circuit 15 is comprised of an A/D converter, an amplifier, etc., and converts changes in the current read by the magnetic reading head 14 into digital signals.

The current switching circuit 16 includes a D/A converter 31, a comparator 32,
It consists of a transistor 33 and a current detection resistor 34.

The D/A converter 31 converts the output signal of the control circuit 11 into I10.
It inputs through port 17 and outputs a predetermined voltage V.

Comparator 32 detects that the emitter voltage of transistor 33 is D/
Control is performed to match the output voltage of the A converter 31. Thereby, the comparator 32 sets the current flowing through the transistor 33 to a value corresponding to the voltage V determined by the D/A converter 31 using the current detection resistor 34.

Next, the operation of the above-mentioned device will be explained.

The control circuit 11 sends data to be magnetically recorded to the magnetic write circuit 12. At the same time, a current value suitable for the coercive force of the medium to be magnetically recorded, which is set in the current setting unit 10, is instructed to the current switching circuit 16 via the I10 port 17.

The magnetic write circuit 12 modulates the received data and sends it to the magnetic write head 13. At this time, current switching circuit 1
6 causes current to flow from the magnetic write circuit 12 to the magnetic write head 13 at a current value instructed by the control circuit 11. This generates a magnetic flux commensurate with the current flowing through the magnetic write head 13, and magnetizes the magnetic medium.

Therefore, magnetization is performed according to the coercive force of the magnetic medium.

Thereafter, the magnetic recording medium is transferred to the magnetic read head 14.
The voltage generated by moving in close contact with is amplified and modulated by the magnetic reading circuit 15 and sent to the control circuit 11. The control circuit 11 compares the written data with the read data to confirm that the data has been read normally.

Next, the operation when erasing or rewriting magnetic information on a magnetic medium will be explained.

The control circuit 11 receives and receives read data by moving the magnetic recording medium in close contact with the magnetic reading head 14. The control circuit 11 uses the data to
Decide whether to erase or rewrite the data and send the data to the magnetic write circuit 1.
Send to 2.

It also instructs the current switching circuit 16 to set a current value corresponding to the coercive force of the magnetic medium written in the read data.

After that, by performing magnetic recording in the same manner, magnetic erasing and rewriting can be performed.

The above-described magnetic writing device can be applied to various devices such as ticket issuing devices for train tickets, airline tickets, etc., bankbook and certificate issuing devices, and ordinary magnetic tape devices.

(Effects of the Invention) As explained above, according to the magnetic writing device of the present invention,
Since the current during magnetic writing is switched depending on the coercive force of the magnetic medium, magnetic writing and magnetic erasing can be performed on magnetic media having different coercive forces. As a result, in a system using a magnetic writing device, it is possible to easily change the system to improve the performance of the magnetic medium.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a magnetic writing device of the present invention, and FIG. 2 is a block diagram of a conventional magnetic writing device. 10... Current setting device, 11... Control circuit, 12...
- Magnetic write circuit, 13... Magnetic write head, 4...
Magnetic reading head, 15... Magnetic reading circuit, 16...
Current switching circuit.

Claims (1)

[Scope of Claims] A magnetic write head that writes magnetic information on a magnetic medium, a current setter that sets a current supplied to the magnetic write head according to a coercive force of the magnetic medium, and a current setting device that sets the current supplied to the magnetic write head according to the coercive force of the magnetic medium. 1. A magnetic writing device comprising: a current switching circuit that switches the current supplied to the magnetic writing head according to device settings.