JP2001035034A - Method for adjusting magnetic head position in magneto- optical disk recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure positional adjustment of a magnetic head relative to an optical head by displacing the spot position of a laser beam emitting from the optical head, at a prescribed quantity to the outer and inner circumferential side of a magneto-optical disk, while impressing a magnetic field by the magnetic head, and by specifically displacing the magnetic head position in accordance with the level of reflected light during the prescribed displacement. SOLUTION: Positional adjustment is made by displacing the spot position of a laser beam to the outer circumferential side, i.e., in the F direction and to the inner circumferential side, i.e., in the R direction, while impressing a magnetic field to an optical disk by a magnetic head. This displacement operation is started after the spot position is coincided with a signal track by a tracking servo, displacing at a specific quantity from a spot position L1 to position L2 is executed, then to position L3, the displacement quantity is equalized between L1-L2 and L1-L3. If a reflected light level is discriminated within a prescribed range during the displacement, a recording operation is started.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical disk recording / reproducing apparatus, and more particularly to a method for adjusting a position of a magnetic head.

[0002]

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

[0003]

A recent magneto-optical disk 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 disk, a method of reducing the width between tracks on which signals are recorded, that is, increasing the density of tracks has been performed.

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 magnetic head position adjusting method for a magneto-optical disk recording / reproducing apparatus which solves the above problem.

[0006]

According to the present invention, the spot position of the laser beam irradiated from the optical head is displaced by a predetermined amount to the outer and inner peripheral sides of the magneto-optical disk while the magnetic field is applied from the magnetic head, and the spot is obtained during that time. The position of the magnetic head is displaced toward the outer circumference or the inner circumference of the magneto-optical disk in accordance with the level of the reflected light.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of an operation for explaining a magnetic head position adjusting method of the present invention. FIG. 2 is a side view of a main part showing a magnetic head device according to a magnetic head position adjusting method of the present invention.
FIG. 3 is a plan view of a main part showing a magnetic head device according to the magnetic head position adjusting method of the present invention.

In FIG. 2, reference numeral 1 denotes a magneto-optical disk, which is mounted on a turntable (not shown) when mounted at a mounting position, and is configured to be rotationally driven by the turntable. Reference numeral 2 denotes an optical head disposed below the magneto-optical disk 1, and focuses a laser beam 3 emitted from a laser element (not shown) on a signal recording surface provided on the magneto-optical disk 1. It has the function of causing The spot position of the laser beam 3 is displaced in the radial direction of the magneto-optical disk 1 by the displacement operation of an objective lens (not shown) incorporated in the optical head 2, that is, in the directions of arrows A and B in FIG. It is configured to be.

Reference numeral 4 denotes a pickup support substrate on which the optical head 2 is mounted. The pickup support substrate 4 is supported by guide means (not shown) so as to enable the magneto-optical disk 1 to be displaced in the radial direction, and has a feed groove on the periphery. 5 is configured to be moved in the radial direction by rotation of the pickup feed shaft 6 on which the pickup 5 is formed.

Reference numeral 7 denotes a magnetic head 9 which is rotatably mounted on a support portion 4A formed on the pickup support substrate 4 by a rotation support shaft 8 and which is disposed above the magneto-optical disk 1. The magnetic head support plate is fixed to the portion, and is located between an operation position for recording a signal on the magneto-optical disk 1, ie, a position shown in FIG. 2 and a non-operation position for not performing a recording operation, ie, a position shown in FIG. It is provided so as to be rotationally displaced between the position displaced in the counterclockwise direction. Since the rotational displacement operation between the operation position and the non-operation position of the magnetic head support plate 7 can be performed by using a known technique, the description thereof is omitted.

In such a configuration, a feed groove 8A is formed on the periphery of the rotation support shaft 8 so that the magnetic head support plate 7 can be displaced in the radial direction of the magneto-optical disk 1 by its rotation. Is configured.

Reference numeral 10 denotes a magnetic head moving motor fixed to the pickup supporting substrate 4, and a worm gear 11 is fixed to a rotating shaft 10A. A first transmission gear 12 is rotatably provided on the pickup support substrate 4 and is rotatably driven by rotation of the worm gear 11, and a first transmission gear 13 is rotatably provided on the pickup support substrate 4 and This is a second transmission gear to which the rotation of one transmission gear 12 is transmitted, and a third transmission gear 14 having a different diameter is provided so as to rotate integrally.

A fourth gear 15 is rotatably provided on the pickup supporting substrate 4 and meshes with the third transmission gear 14 to transmit the rotation of the third transmission gear 14.
A worm gear 18 meshing with a drive gear 17 provided at an end of the rotation support shaft 8 is fixed to an upper end of a drive shaft on which a transmission gear 16 is attached so as to rotate integrally. I have.

The magnetic head device according to the present invention is configured as described above. Next, the operation of the magnetic head device will be described. When the operation of mounting the magneto-optical disk 1 at the mounting position of the disk provided in the magneto-optical disk recording / reproducing apparatus is performed,
Is mounted on the turntable and the magnetic head support plate 7 is rotated and displaced from the inoperative position to the operating position. The state shown in FIG. 2 shows such a state.

In this state, when an operation for recording a signal on the magneto-optical disk 1 is performed, the laser beam 3 is irradiated from the optical head 2 onto the magneto-optical disk 1 and the magnetic head 9 emits the laser beam 3. An operation of applying a magnetic field is performed, and a signal is recorded on the magneto-optical disk 1. In this manner, the signal recording operation on the magneto-optical disk 1 is performed, but the pickup supporting substrate 4 is moved in the radial direction of the magneto-optical disk 1 by the rotation of the pickup feed shaft 6, so that the optical head 2 and the The magnetic head 9 is integrally moved in the radial direction, and can perform a signal recording operation while following a track called a wobble provided on the magneto-optical disk 1.

As described above, the signal recording operation is performed, but the position of the laser beam 3 irradiated from the optical head 2 and the position to which the magnetic field from the magnetic head 9 is applied are shifted next. , That is, the displacement operation of the magnetic head 9 will be described.

Such a displacement operation can be performed by rotating the magnetic head moving motor 10 fixed on the pickup support substrate 4. When the magnetic head moving motor 10 rotates, its rotating shaft 10
A rotates the worm gear 11, the first transmission gear 12, the second
Transmission gear 13, third transmission gear 14, fourth transmission gear 16,
Drive gear 17 via drive shaft 15 and worm gear 18
, The rotation support shaft 8 provided with the drive gear 17 at the end is rotated. When the rotation support shaft 8 rotates, a feed groove 8A is formed in the peripheral edge of the rotation support shaft 8, so that the magnetic head support plate 7 rotatably supported by the rotation support shaft 8 becomes a magneto-optical disk. 1 is displaced in the radial direction.

As described above, the magnetic head support plate 7 is displaced in the radial direction of the magneto-optical disk 1 so that the magnetic head 9 fixed to the end of the magnetic head support plate 7 is Since it is displaced in the radial direction, the position of the magnetic head 9 can be adjusted by rotating the electric motor 10 for moving the magnetic head in the forward and reverse directions.

As described above, the moving displacement operation of the magnetic head 9 in the magnetic head device according to the present invention is performed. Next, a method for adjusting the position of the magnetic head according to the present invention will be described with reference to FIG. In FIG. 1, C is a core constituting the magnetic head 9, and a line P is a center line thereof.
T indicates a signal track provided on the magneto-optical disk 1, and L 1, L 2 and L 3 indicate positions of spots which are focal points of the laser beam 3 emitted from the optical head 2.

The position adjustment operation of the magnetic head 9 is performed by setting the spot position of the laser beam 3 on the outer peripheral side of the optical disk 1, that is, in the F direction and the inner peripheral side while the magnetic field from the magnetic head 9 is applied to the optical disk 1. That is, the displacement is performed by displacing in the R direction. Such a displacement operation is started after the position of the spot is made coincident with the signal track T by the tracking servo.

The spot L1 shown in FIG. 1 shows a state where the spot position coincides with the signal track T by the tracking servo operation. The spot position is changed to F by displacing the objective lens from this state. In the direction, that is, displaced by a predetermined amount from the position of the spot L1 to the position of L2. After that, the spot position is displaced in the R direction, displaced by a predetermined amount from the position of the spot L1, and displaced to the position of L3. In this way, the spot displacement operation is performed,
The displacement amount up to 2 and the displacement amount from L1 to L3 are set to be the same.

An operation for detecting a level change of light reflected from the magneto-optical disk 1 is performed while performing the above-described displacement operation, and an operation for determining whether or not the level is within a predetermined range is performed. When it is determined that the level of the reflected light is within a predetermined range by such a determination operation, the positional relationship between the position of the magnetic head 9 and the optical head 2 falls within an allowable range in which a signal can be recorded on the magneto-optical disk 1. It is determined that there is. Accordingly, in such a case, the signal recording operation on the magneto-optical disk 1 is started without performing the position adjustment of the magnetic head 9.

When the level of light reflected from the magneto-optical disk 1 is within a predetermined range, the signal recording operation on the magneto-optical disk 1 starts without adjusting the position of the magnetic head 9 as described above. Then, the magneto-optical disk 1
The operation in the case where the level of the light reflected by the light is not within the predetermined range will be described.

For example, a case where the spot position of the laser beam 3 is displaced to the outer peripheral side of the magneto-optical disk 1, that is, a case where the level of the reflected light is out of a predetermined range when displaced to the position of the spot L2 will be described. In such a case, it can be determined that the position of the magnetic head 9 is shifted to the inner peripheral side with respect to the optical head 2, so that the magnetic head moving electric motor 10 is displaced toward the outer peripheral side by the magnetic head moving motor 10. An operation of making a predetermined rotation is performed. By performing such a displacement operation of the magnetic head 9, the magnetic head 9 can be displaced with respect to the optical head 2 in a direction in which the displacement is eliminated.

In this way, the correction displacement operation is performed when the position of the magnetic head 9 is shifted to the inner peripheral side with respect to the optical head 2, but when the displacement operation is performed, the laser beam 3 is again emitted. The displacement operation of the spot position is changed from L1 to L
2, and from L2 to L3, the operation of determining the level of the reflected light is performed. Such a determination operation is performed until the level of the reflected light at all the spot positions falls within the predetermined range.

When the spot position of the laser beam 3 is displaced toward the outer periphery of the magneto-optical disk 1, ie, when the spot L2
When the level of the reflected light is out of the predetermined range when the laser beam 3 is displaced to the position, the operation is performed as described above. Next, the spot position of the laser beam 3 is displaced to the inner peripheral side of the magneto-optical disk 1. The operation when the level of the reflected light is out of the predetermined range when the position is shifted to the position of the spot L3 will be described.

In such a case, it can be determined that the position of the magnetic head 9 is shifted to the outer peripheral side with respect to the optical head 2, so that the motor 10 for moving the magnetic head is moved to the inner peripheral side. An operation of performing predetermined rotation in the direction of displacement is performed. By performing such a displacement operation of the magnetic head 9, the magnetic head 9 can be displaced with respect to the optical head 2 in a direction in which the displacement is eliminated.

In this manner, the correction displacement operation is performed when the position of the magnetic head 9 is shifted to the outer peripheral side with respect to the optical head 2, but when the displacement operation is performed, the spot of the laser beam 3 is again emitted. Position displacement operation from L1 to L
2, and from L2 to L3, the operation of determining the level of the reflected light is performed. Such a determination operation is performed until the level of the reflected light at all the spot positions falls within the predetermined range.

As described above, the laser beam 3
A displacement operation to the outer and inner peripheral sides of the magneto-optical disc 1 for adjusting the position of the magnetic head of the spot at the focal point is performed, but the amount of displacement between the spots L2 and L3 is applied from the magnetic head 9. It is set so as to be within the operable range of recording by the applied magnetic field. With this setting, if the level of the reflected light obtained between the spots L2 and L3 is within a predetermined range, it is determined that the positional relationship of the magnetic head 9 with respect to the optical head 2 is in a recordable state. I can do it.

Further, by setting the amount of displacement moved when adjusting the position of the magnetic head 9 to be substantially the same as the amount of displacement of the spot of the laser beam 3, that is, the distance from the spots L1 to L2, the magnetic displacement is corrected. When the moving operation of the head 9 is performed, it is possible to prevent the position of the magnetic head 9 from shifting to the opposite side.

The magnetic head position adjusting operation of the magneto-optical disk recording / reproducing apparatus performs a magnetic head position adjusting operation for making the relationship between the position of the laser beam 3 irradiated from the optical head 2 and the position to which the magnetic field from the magnetic head 9 is applied a recordable state. If the configuration is such that the operation is performed when the magneto-optical disk 1 is mounted at the mounting position, the signal recording operation on the magneto-optical disk 1 can be started immediately.

[0032]

According to the magnetic head position adjusting method of the present invention, the spot position of the laser beam irradiated from the optical head while the magnetic field is applied from the magnetic head is located on the outer peripheral side and the inner peripheral side of the magneto-optical disk. Since the position of the magnetic head is displaced toward the outer peripheral side or the inner peripheral side of the magneto-optical disk in accordance with the level of reflected light obtained during the quantitative displacement, the position of the magnetic head with respect to the optical head is surely adjusted. I can do it.

Further, according to the present invention, the amount of displacement of the spot position to the outer and inner peripheral sides of the magneto-optical disk is set within the range in which recording can be performed by the magnetic field applied from the magnetic head. If the level of the obtained reflected light is within the predetermined range, it can be determined that the positional relationship of the magnetic head with respect to the optical head is in a recordable state, and as a result, the recording operation can be started immediately.

According to the present invention, when the position of the magnetic head with respect to the spot is displaced by an allowable amount or more, the magnetic head is displaced by a predetermined amount in a direction to correct the deviation. Adjustment can be performed reliably.

Further, according to the present invention, a magnetic head position adjusting operation for setting a relation between a position of a laser beam irradiated from an optical head and a position to which a magnetic field is applied from a magnetic head in a recordable state is performed on a magneto-optical disk. Since the operation is performed when the magneto-optical disk is mounted at the mounting position of the reproducing apparatus, there is an advantage that the signal recording operation on the magneto-optical disk can be started immediately.

[Brief description of the drawings]

FIG. 1 is an operation explanatory diagram for explaining a magnetic head position adjusting method of the present invention.

FIG. 2 is a side view of a main part showing a magnetic head device according to the magnetic head position adjusting method of the present invention.

FIG. 3 is a plan view of a main part showing a magnetic head device according to a magnetic head position adjusting method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magneto-optical disk 2 Optical head 4 Pickup support substrate 7 Magnetic head support plate 8 Rotation support shaft 9 Magnetic head 10 Motor for moving magnetic head

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hideo Sekine 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. F-term (reference) 5D075 AA03 CF03 CF06 CF08

Claims (4)

[Claims] 1. A signal is transmitted to a magneto-optical disk by a laser beam emitted from an optical head arranged on one surface of the magneto-optical disk and a magnetic field applied from a magnetic head arranged on the other surface of the magneto-optical disk. In a magneto-optical disk recording / reproducing apparatus configured to perform recording, a spot position of a laser beam irradiated from an optical head while a magnetic field is applied from a magnetic head is located on an outer peripheral side and an inner peripheral side of the magneto-optical disk. A magnetic head for a magneto-optical disk recording / reproducing device, wherein the magnetic head is displaced quantitatively and the position of the magnetic head is shifted toward the outer peripheral side or the inner peripheral side of the magneto-optical disk according to the level of reflected light obtained during the quantitative displacement. Position adjustment method. 2. The recording medium according to claim 1, wherein the amount of displacement of the spot position toward the outer circumference and the inner circumference of the magneto-optical disk is set within a recordable range by a magnetic field applied from a magnetic head. Magnetic head adjustment method. 3. The magnetic head according to claim 2, wherein when the position of the magnetic head with respect to the spot is displaced by an allowable amount or more, the magnetic head is displaced by a predetermined amount in a direction to correct the deviation. Adjustment method. 4. The method according to claim 1, wherein the position of the magnetic head is adjusted when the magneto-optical disk is mounted at the mounting position.