JP2000353345A - Magneto-optical head and driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform efficient signal recording operation by providing plural coils on a magnetic head and performing individual supply operation of a driving signal to a coil wound on each core. SOLUTION: When it is discriminated that a laser beam is positioned at a position opposite to a first core 8 by a detecting signal from a laser position detecting circuit, a signal is supplied to only a first magnetic head drying circuit from a control circuit, and a drive signal is supplied to a first coil. Also, when it is discriminated that a laser beam is positioned at a position opposite to a second core 9, a signal is supplied to only a second magnetic head driving circuit from a control circuit, and a drive signal is supplied to a second coil. Driving signals are supplied to each of first to third coils respectively corresponding to a position of a laser beam. Therefore, a magnetic field can be applied to a position of a laser beam from each core incorporated in a magnetic head 4 even if a position of a laser beam is moved following a signal track.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical head used in a magneto-optical recording and reproducing apparatus, and more particularly to a magneto-optical head suitable for performing a high-density recording operation.

[0002]

2. Description of the Related Art When a temperature is locally increased by irradiating a radiant energy such as a laser beam to a magneto-optical recording medium, a magnetic coercive force is reduced, and a magnetic domain corresponding to the direction of a magnetic field acting on this area is reduced. A magneto-optical recording / reproducing apparatus configured to perform a signal recording / reproducing operation by utilizing the arrangement of the optical discs has been commercialized.

[0003]

A recent magneto-optical recording / reproducing apparatus is often used in combination with a computer. In this case, it is necessary to record a large amount of data signals. Recording capacity is increasing. As a method for increasing the recording capacity of a magneto-optical recording disk, high-density recording is performed by reducing the width between tracks on which signals are recorded.

In order to perform a data signal recording / reproducing operation at a high speed and a high density, it is necessary to narrow a magnetic field applied from a magnetic head to a narrow range. For this purpose, a coil for generating a magnetic field is wound. It is necessary to reduce the shape of the core. When the magnetic field applied from the magnetic head is narrowed to a narrow range by reducing the shape of the core, the position and magnetic field of the laser beam emitted from the optical head due to the surface deflection and the core deflection due to the rotation of the magneto-optical disk are applied. There is a problem that the position is shifted.

An object of the present invention is to provide a magneto-optical head and a driving device which solve such a problem.

[0006]

A magneto-optical head according to the present invention comprises a laser beam irradiated from an optical head disposed on one surface of a magneto-optical recording disk and a magnetic head disposed on the other surface. In a magnetic head configured to record a signal on the magneto-optical recording disk by an applied magnetic field, a plurality of cores are provided on the magnetic head.

Further, according to the present invention, a laser beam irradiated from an optical head disposed on one surface of a magneto-optical recording disk and a magnetic field applied from a magnetic head disposed on the other surface of the magneto-optical recording disk are used. In a magnetic head configured to record a signal on a magnetic recording disk, a plurality of cores are provided in the magnetic head, and an operation of supplying a drive signal to each core can be performed individually.

[0008]

FIG. 1 is a diagram showing the relationship between the optical head of the present invention and a magneto-optical recording disk, FIG. 2 is a diagram showing the relationship between the core of the magnetic head and signal tracks of the magneto-optical recording disk, and FIG. FIG. 2 is a block circuit diagram showing an embodiment of the device.

In FIG. 1, reference numeral 1 denotes a magneto-optical disk, and 2 denotes an objective lens incorporated in an optical head disposed below the magneto-optical disk 1, and a laser beam emitted from a laser element (not shown). The function of focusing the beam 3 on the signal recording surface provided on the magneto-optical disk 1 is achieved.

Reference numeral 4 denotes a magnetic head provided integrally with the optical head to move in the radial direction of the magneto-optical disk 1 and disposed above the magneto-optical disk 1. And a first core 8, a second core 9, and a third core 10 around which the second coil 6 and the third coil 7 are respectively wound. In such a configuration, the first core 8, the second core 9, and the third core 10 are perpendicular to the tangential direction of the signal track T provided on the magneto-optical disk 1, as shown in FIG. Arrow A
Are arranged in the normal direction indicated by.

The magneto-optical head of the present invention is constructed as described above. Next, the operation will be described with reference to the block circuit diagram shown in FIG. In FIG.
Is a first magnetic head drive circuit that supplies a drive signal to the first coil 5 wound around the first core 8, and 12 sends a drive signal to the second coil 6 wound around the second core 9. The second magnetic head drive circuit 13 for supplying the third core 1
A third magnetic head driving circuit for supplying a driving signal to the third coil 7 wound around 0, 14 controls the operation of the first magnetic head driving circuit, the second magnetic head driving circuit, and the third magnetic head driving circuit. This is a control circuit that controls and supplies a signal to each drive circuit.

Numeral 15 denotes a laser position detecting circuit for detecting the position of the laser beam 3 based on a change in the reflected light of the laser beam 3 focused on the magneto-optical disk 1 by the objective lens 2. It is configured to be inputted to. In such a configuration, when it is determined by the detection signal from the laser position detection circuit 15 that the laser beam is located at a position facing the first core 8, the control circuit 14 controls only the first magnetic head drive circuit 11. The first magnetic head driving circuit 1 is supplied with a signal.
1 supplies a drive signal to the first coil 5. When it is determined that the laser beam is located at a position facing the second core 9, a signal is supplied from the control circuit 14 to only the second magnetic head drive circuit 12, and the second magnetic head drive circuit 12 supplies the signal. A drive signal is supplied to the second coil 6. Similarly, when it is determined that the laser beam is located at a position facing the third core 10, a signal is supplied from the control circuit 14 to only the third magnetic head drive circuit 13, and the third magnetic head drive circuit 13 supplies a drive signal to the third coil 7.

A laser beam is applied to a first core 8 and a second core 9.
If it is determined that the driving signal is located at a position facing the third core 10, the operation of supplying the driving signal only to the first coil 5, the second coil 6, and the third coil 7 is performed as described above. Next, an operation when it is determined that the laser beam is positioned between the first core 8 and the second core 9 will be described. When it is determined in this way, a signal is supplied from the control circuit 14 to the first magnetic head drive circuit 11 and the second magnetic head drive circuit 12, and the first magnetic head drive circuit 11 and the second magnetic head drive circuit A drive signal is supplied from 12 to the first coil 5 and the second coil 6.

Similarly, the laser beam is applied to the first core 8 and the third core 8.
If it is determined that it is located between the core 10 and
A signal is supplied from the control circuit 14 to the first magnetic head drive circuit 11 and the third magnetic head drive circuit 13, and the first coil 5 and the third coil are supplied from the first magnetic head drive circuit 11 and the third magnetic head drive circuit 13. 7 is supplied with a drive signal.

As described above, the drive signal is supplied to each of the first coil 5, the second coil 6, and the third coil 7 in accordance with the position of the laser beam. The magnetic field can be applied to the position of the laser beam from each core incorporated in the magnetic head 4 even if the position of the laser beam moves following the signal track due to the surface deviation and the core deviation due to The signal recording operation on the disk 1 can be performed.

In the present embodiment, the number of cores is three, but may be two, and four or more cores may be provided. Then, it is also possible to configure so as to simultaneously supply drive signals to all the coils in accordance with the signal recording operation.

[0017]

The magneto-optical head according to the present invention has a plurality of magnetic heads for applying a magnetic field for recording a signal at a position of a laser beam irradiated from an optical head disposed on one surface side of a magneto-optical recording disk. Since the core is provided, it is possible to reliably apply a magnetic field to the position of the laser beam even if the shape of the core is reduced in order to perform high-density recording operation.
Even if the position of the laser beam moves following the signal track due to surface deviation or core deviation due to rotation of the magneto-optical disk, the signal recording operation can be performed reliably.

Further, in the present invention, since a plurality of cores are arranged in the normal direction with respect to the signal tracks provided on the optical disk recording disk, the position of the laser beam is changed by the misalignment due to the rotation of the magneto-optical disk. The magnetic field required for the recording operation can be reliably applied even if the magnetic head moves in the normal direction following the track.

According to the present invention, the core is constituted by the first, second and third cores arranged in the normal direction of the signal track of the magneto-optical recording disk, that is, at the position corresponding to the signal track. Since two cores are provided on both sides of the core, the operation of applying a magnetic field corresponding to the position of the laser beam that changes in accordance with the signal track can be performed well and efficiently.

Further, according to the present invention, the operation of supplying a drive signal to the coil wound around each of a plurality of cores constituting the magnetic head can be performed individually.
The signal recording operation can be performed efficiently. And, since the present invention is configured to perform the operation of supplying the drive signal to the coils wound around each coil in accordance with the position of the laser beam, only the coils necessary for performing the recording operation are driven. Since a signal may be supplied, power consumption can be reduced and the amount of heat generated can be suppressed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a relationship between an optical head of the present invention and a magneto-optical recording disk.

FIG. 2 is a diagram showing a relationship between a magnetic head of the present invention and a signal track of a core magneto-optical recording disk.

FIG. 3 is a block circuit diagram showing an embodiment of a driving device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magneto-optical recording disk 2 Objective lens 4 Magnetic head 5 1st coil 6 2nd coil 7 3rd coil 8 1st core 9 2nd core 10 3rd core 14 Control circuit 15 Laser position detection circuit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideo Sekine 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. F-term (reference) 5D075 CF03 CF10 5D091 AA08 CC24 GG40 HH20

Claims (5)

[Claims] 1. A magneto-optical recording disk, comprising: a laser beam emitted from an optical head disposed on one surface of a magneto-optical recording disk; and a magnetic field applied from a magnetic head disposed on the other surface of the magneto-optical recording disk. A magneto-optical head comprising a plurality of cores provided in a magnetic head configured to record signals. 2. The magneto-optical head according to claim 1, wherein the core is arranged in a direction normal to a signal track provided on the magneto-optical recording disk. 3. The magneto-optical head according to claim 1, wherein the core is constituted by first, second and third cores. 4. The magneto-optical recording disk is irradiated with a laser beam emitted from an optical head disposed on one side of the magneto-optical recording disk and a magnetic field applied from a magnetic head disposed on the other side of the magneto-optical recording disk. In a magnetic head configured to record signals, the magnetic head is provided with a plurality of cores, and is configured to be capable of individually supplying a drive signal to a coil wound on each core. A driving device characterized by the above-mentioned. 5. The apparatus according to claim 4, wherein a driving signal is supplied to a coil wound around each core in accordance with a position of a laser beam emitted from the optical head. The driving device as described.