JPH056593A - Magneto-optical disk driving device - Google Patents

Abstract

PURPOSE:To attain high speed access and to surely write data by forming a relative positional deviation between an optical system and a magnetic head with a senser, controlling a magnetic head driving actuater and holding the relative positional deviation to zero always. CONSTITUTION:A movable optical system 3 and a floating magnetic head 24 are driven by an optical system and a magnetic head driving actuators 6, 7 and the relative positional deviation between the optical system 3 and the head 24 is detected by a senser part 8. By this detected result, a current flowing through the actuater 7 is controlled by a current driver 12 so as to hold the above-mentioned relative positional deviation constant and the synchronization of the position is attained. Further, the head 24 is lifted by a head elevation device 41 having a rotary arm 25 energized with a spring 27 and held in a state of non-contact with a magneto-optical disk 1. Thus, the high speed access is attained, the data is written surely and the disk 1 is exchangeable.

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 drive device, and more particularly to position control of an optical system and a magnetic head.

[0002]

2. Description of the Related Art In recent years, a computer external recording device using a magneto-optical recording system has begun to be put into practical use. A magneto-optical disk drive device used in this type of external storage device locally heats a recording medium to near the Curie temperature by spot-irradiating a laser beam from an optical system onto the surface of the magneto-optical disk, and a magnetic head is used. Data writing is performed with the generated magnetic field. However, in the early magneto-optical disk drive device, rewriting of data required one rotation for erasing old data and one rotation for writing new data, so that it took time to rewrite data.

Recently, much research has been conducted on a method called overwrite in which old data is erased at the same time new data is written. Among the overwrite methods, a magnetic field (or magnetic) modulation type overwrite method is promising as a method in which old data is less likely to remain.

There are the following three types of magnetic heads used in the magnetic field modulation type overwrite system, but the floating magnetic head is highly practical for reasons of reliability of data writing and structural aspects. (1) Fixed magnetic head: A magnetic head that does not control the distance between the magneto-optical disk surface and the magnetic head. (2) Levitation magnetic head: Due to the pressure generated by using the air flow generated by the rotation of the magneto-optical disk. , Magnetic head which floats the magnetic head above the magneto-optical disk surface by a certain amount (3) Active spacing control type magnetic head: A sensor is used to positively control the distance between the magnetic head and the magneto-optical disk surface. Magnetic head

FIG. 18 shows the recording principle of a magneto-optical disk device of the magnetic field modulation type overwrite system. In FIG. 18, the surface of the magneto-optical disk 37 is spot-irradiated with laser light of a constant intensity from the optical system 38, and the recording medium 39 is recorded.
Is locally heated to near the Curie temperature, and the magnetic head 4
When energizing 0 and generating a magnetic field, the data "1",
By writing the data by modulating the direction of the magnetic field by modulating the direction of the current according to "0".

[0006]

However, in the magnetic field modulation type overwrite system, when a magnetic head that covers the entire movable range of the optical system is used as in the conventional case, a large magnetomotive force is required, and therefore the self-inductance is increased. Becomes large, it becomes impossible to overwrite in the high frequency range.

Therefore, if it is attempted to overwrite by a movable magnetic head having a small size and a small magnetomotive force so that overwriting can be performed in a high frequency range, the movement of the optical system when the optical system moves by its driving actuator. Accordingly, the magnetic head must be moved to the same position as the optical system. The reason is that the magnetic field generated by the magnetic head has a very narrow magnetic field distribution range for writing data to the recording medium, and
This is because data cannot be written unless the position of the beam spot emitted from the optical system is surely set within the distribution range of the magnetic field required for recording.

However, if the optical system and the magnetic head are integrally constructed and are moved to the same position, the access speed is lowered due to the increase in weight and resonance is caused due to the imbalance of the driving actuator. become.

When a floating magnetic head is used,
Since the magnetic head is always pressed against the surface of the magneto-optical disk, it is in contact with the magneto-optical disk even when the magneto-optical disk is stationary, and it is impossible to replace the magneto-optical disk.

The present invention is intended to solve the above-mentioned problems of the prior art, and the object thereof is to enable high-speed access and to prevent resonance from occurring and to always provide a magneto-optical disk surface between an optical system and a magnetic head. An object of the present invention is to provide a magneto-optical disk drive device of a magnetic field modulation type overwrite system capable of maintaining a relative positional relationship in the direction along. Another object is to provide a magnetic field modulation type overwrite type magneto-optical disk drive device capable of exchanging the magneto-optical disk even when a floating magnetic head is used.

[0011]

According to a first aspect of the present invention, there is provided a magneto-optical disk drive device configured as described above, wherein the optical system and the magnetic head are dedicated actuators in a magneto-optical disk drive device which performs overwriting by a magnetic field modulation method. It has a movable structure to be driven, and a sensor is provided on at least one side of the optical system and the magnetic head, and a magneto-optical disk surface of the optical system and the magnetic head when the optical system is moved by the sensor. And a control device for detecting the relative positional deviation in the direction along the line and controlling the output to the magnetic head driving actuator according to the detection result to synchronize the position of the optical system with the position of the magnetic head. It is characterized by that.

In this case, preferably, as in the second aspect of the invention, the optical system is an objective lens, a moving optical system including an objective lens driving actuator other than the optical system driving actuator, and a flip-up mirror, and another optical system. A fixed optical system including an optical component is provided, or, as in the invention of claim 3, the sensor is an optical sensor provided on one side of the optical system or the magnetic head, and the other side of the sensor is an optical sensor. A light beam irradiation device for irradiating a light beam to the optical sensor is provided, or, as in the invention of claim 4, the sensor is a magnetic sensor provided on one side of the optical system or the magnetic head, A magnetic field applying device for applying a magnetic field to the magnetic sensor is provided on the other side, and the magnetic head is a floating magnetic head. A head elevating device for lowering the floating magnetic head to the surface of the magneto-optical disk when accessing the magneto-optical disk, and raising the floating magnetic head to a position exceeding the surface of the magneto-optical disk when not accessing. I shall.

According to a sixth aspect of the present invention, there is provided a magneto-optical disk drive device, wherein the magneto-optical disk drive device performs overwriting by a magnetic field modulation method using a flying magnetic head, when the magneto-optical disk is accessed. Lower the magnetic head to the surface of the magneto-optical disk,
It is characterized by comprising a head elevating device for elevating the floating magnetic head to a position beyond the surface of the magneto-optical disk during non-access.

As the head elevating device, for example, as in the invention of claim 7, a rotation provided by a mechanical mechanism provided at the origin position of the floating magnetic head is rotated by a mechanical mechanism in accordance with the movement of the floating magnetic head. An arm provided with an arm, or an arm having a fixed arm fixed to the origin position of the floating magnetic head as in the invention of claim 8, or the invention of claim 9. As described above, there is a device in which the floating magnetic head can be moved up and down at an arbitrary position.

As the head elevating device capable of elevating the floating magnetic head at any position, for example, as in the invention of claim 10, a bracket having a rotatable structure to which the floating magnetic head is attached, and the bracket A stepping motor fixed to a bracket that moves integrally with the floating magnetic head, the stepping motor, and the levitation apparatus, comprising: a solenoid and a spring connected to each other. And a wire connected to the suspension of the magnetic head.

[0016]

According to the structure of the invention of claim 1, since the optical system driving actuator and the magnetic head driving actuator are dedicated to each other, as compared with the case where the optical system and the magnetic head are integrally configured, The weight for each actuator does not increase and there is no load imbalance,
Therefore, the optical system and the magnetic head can be moved without reducing the access speed and without causing resonance. Further, since the positions of the optical system and the magnetic head are synchronized according to the detection result of the sensor, even if the magnetic field generation range of the magnetic head necessary for data writing is narrow, the light between the optical system and the magnetic head is moved when the optical system moves. The magnetic head also moves in a state where the relative positional relationship in the magnetic disk surface direction is maintained, so that data writing is surely performed.

According to the second aspect of the present invention, the optical system is divided into the moving optical system and the fixed optical system, and only the moving optical system is moved by the actuator for driving the optical system. Therefore, the load on the actuator is reduced. The access speed can be increased.

According to the third aspect of the invention, the relative positional deviation is detected by the light receiving position of the light beam on the optical sensor. According to the configuration of the invention of claim 4, the relative positional deviation is detected by the magnetic field distribution on the magnetic sensor.

According to the configuration of the invention of claim 5 or 6,
Even if the magnetic head is a floating type to enable overwriting, the floating magnetic head can be operated by the head lifting device when loading the magneto-optical disk and when removing the magneto-optical disk after the work is completed. Since it can be brought into a non-contact state with the surface of the magnetic disk, it is possible to prevent damage to the magneto-optical disk and head crash when the magneto-optical disk is attached or detached. Therefore, the magneto-optical disk can be replaced.
According to the configuration of the invention of claim 6, the optical system driving actuator and the magnetic head driving actuator are not limited to dedicated ones, and the magneto-optical disk can be exchanged even if they are shared.

According to the structure of the seventh or eighth aspect of the invention, the position where the floating magnetic head comes into non-contact with the magneto-optical disk surface is near the origin position of the floating magnetic head,
The floating magnetic head rides on the rotating arm or fixed arm and rises above the magneto-optical disk surface.

On the other hand, according to the invention of claim 9 or 10 or 11, the position where the floating magnetic head can be brought into a non-contact state with the magneto-optical disk surface is arbitrary, and when the solenoid is energized at a desired position, the spring The floating magnetic head rises above the magneto-optical disk surface due to the rotation of the bracket against the force and the wire pulling up the suspension when the stepping motor is energized.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a magneto-optical disk drive device according to the present invention will be described below with reference to FIGS.

[Embodiment 1] FIG. 1 is a diagram showing the overall construction of an embodiment of a magneto-optical disk drive device according to the present invention. In FIG. 1, 1 is a magneto-optical disk, 2 is a spindle motor, 3 is a moving optical system, 4 is a fixed optical system, 5
Is a magnetic head, 6 is an actuator for driving an optical system, 7 is an actuator for driving a magnetic head, 8 is a sensor section, 9 is a current driver for modulating a current flowing through the magnetic head 5, and 10 is a signal from the sensor section 8. An amplifier 11 for amplifying, a current driver 11 for supplying a current to the actuator 7 for driving the optical system in order to control the position of the moving optical system 3, 1
Reference numeral 2 is a current driver (control device) for supplying a current to the magnetic head driving actuator 7 for controlling the position of the magnetic head 5. In this embodiment, the magnetic head 5 is a floating magnetic head, and the floating magnetic head 5 is attached to a bracket 28 driven by the magnetic head driving actuator 7 via a suspension 13. The moving optical system 3 includes an objective lens 14, an actuator (not shown) for driving the objective lens 14, and a flip-up mirror.
The laser beam 15 from is spot-irradiated on the surface of the magneto-optical disk.

FIG. 2 shows a specific configuration of the moving optical system 3 and the magnetic head 5 when the optical sensor 16 is used in the sensor section 8. In this embodiment, the moving optical system 3 and the magnetic head 5 are attached to dedicated drive actuators 6 and 7, respectively. Further, the optical sensor 16 is installed in the bracket 28 on the magnetic head 5 side, and the light beam 18 is irradiated to the optical sensor 16 by the beam irradiation device 17 provided on the bracket 42 on the moving optical system 3 side. The bracket 42 is driven by the actuator 6 for driving the optical system.

FIGS. 3A and 3B show the principle of detecting the relative positional deviation between the moving optical system 3 and the magnetic head 5. Figure 3
As shown in (a), the optical sensor 16 is divided into two in the moving direction, and the difference p−q between the incident light amount p to one optical sensor 16a and the incident light amount q to the other optical sensor 16b is deviated. It changes as shown in FIG. 3B according to the amount X and the deviation direction. Therefore, the deviation direction is detected by taking the difference p-q in the quantity of light incident on the optical sensor 16 divided into two, and the current flowing through the actuator 7 for driving the magnetic head is detected according to the difference p-q in the quantity of incident light and the deviation direction. The position of the moving optical system 3 and the magnetic head 5 are synchronized by being controlled by the current driver 12.

To write data, the magnetic head 5
A magnetic field is generated by applying an electric current to the recording medium, and the magnetic field is modulated by modulating the electric current, and at the same time, the moving optical system 3 irradiates the surface of the magneto-optical disk 1 with a laser beam in a spotwise manner so that the recording medium is near the Curie temperature. Data is written in the magnetic field from the magnetic head 5 by heating up to. At this time, in order to reliably write the data, a magnetic field of a certain value or more is necessary, and the beam spot must be within the range satisfying the condition in the magnetic field distribution generated by the magnetic head 5. FIG. 4 shows the magnetic field distribution 19 generated by the magnetic head 5 and the moving optical system 3 for the magnetic field distribution 19.
This shows the allowable range 20 of the relative position with respect to the further irradiated beam spot. In this embodiment, the magnetic head 5 and the moving optical system 3 satisfy the above relationship when the output from the optical sensor 16 is zero. It is adjusted to do. Therefore, even when the moving optical system 3 is moved by the optical system driving actuator 6, the relative positional relationship between the moving optical system 3 and the magnetic head 5 in the magneto-optical disk surface direction depends on the signal from the optical sensor 16. In the magnetic field distribution 19 generated by the magnetic head 5, the beam spot position, which is kept constant by the movement of the driving actuator 7 and is always irradiated by the moving optical system 3, is a magnetic field 21 necessary for writing data. Within this range, data can be written reliably.

[Embodiment 2] FIG. 5 is an embodiment showing the structure of the moving optical system 3 and the magnetic head 5 when a magnetic sensor is used as the sensor unit. 22a and 22b show a magnetic sensor, and 23 shows a magnet. In this embodiment, the magnetic sensors 22a and 22b are installed on the bracket 28 on the magnetic head side, and are arranged in the same direction as the moving direction of the magnetic head 5. The magnet 23 is installed in the bracket 42 on the moving optical system 3 side and moves integrally with the moving optical system 3, and is located between the magnetic sensors 22a and 22b to give a magnetic field to these magnetic sensors. Then, the magnetic sensor 22a
And the output difference of 22b, the shift amount and direction of the moving optical system 3 and the magnetic head 5 are detected. In the present embodiment, the magnetic head 5 and the moving optical system 3 have a magnetic field distribution generated by the magnetic head 5 when the output difference between the magnetic sensors 22a and 22b is 0,
It is adjusted so as to satisfy the relationship of FIG. 4 showing the permissible range of the relative position with respect to the beam spot emitted from the moving optical system 3.

The inventions of claims 1 to 4 are not limited to the above-described first and second embodiments, and many modifications can be made. For example, the magnetic head 5 need not be a levitation type magnetic head, but a fixed type magnetic head in which the distance between the moving optical system 3 and the magnetic head 5 is rigidly held, or the magnetic head 5 itself is optically detected by an optical sensor or the like. There is no problem even with an active spacing control type magnetic head that controls the gap by following the fluctuation of the magnetic disk surface. Further, there is no limitation on the mounting position and the number of the sensors 16, 22a, 22b. The optical systems 3 and 4 may be integrated.

[Embodiment 3] FIG. 6 is a diagram showing the entire structure of an embodiment of a magneto-optical disk drive device according to the present invention. In FIG. 6, reference numeral 24 is a floating magnetic head, and 25
Is a rotary arm, and other members such as a magneto-optical disk 1, a spindle 2, a moving optical system 3, a fixed optical system 4, an optical system driving actuator 6, a magnetic head driving actuator 7, a sensor unit 8, and a current driver 9. , Amplifier 10,
The current drivers 11 and 12, the suspension 13, the objective lens 14 and the like have the same functions as those of the same reference numerals shown in FIG.

FIG. 7 shows the floating magnetic head 2 at the origin position.
The state of 4 is shown. The rotary arm 25 has a rotary shaft 26 supported by a fixed member 43 and performs a rotary motion. The rear end of the rotary arm 25 is constantly pushed up by the spring 27 from the fixed member 43. With the levitation magnetic head 24 at the origin position, the rear end of the rotary arm 25 is pushed down by the bracket 28 that fixes the suspension 13, and the front end of the rotary arm 25 supports the suspension 13 and floats. The magnetic head 24 is being lifted.

FIG. 8 shows the floating magnetic head 2 during access.
The state of 4 is shown. When the floating magnetic head 24 accesses the magneto-optical disk 1, the rear end of the rotating arm 25 is pushed up by the spring 27 and the front end lowers, so that the floating magnetic head 24 descends to the magneto-optical disk surface. Overwrite is possible. At the end, the floating magnetic head 24 returns to the origin position, and the rotating arm 2
5 Push down the rear end of the
And the floating magnetic head 24 is lifted. With such a head lifting device 41, the magneto-optical disk 1 can be replaced because it is not in contact with the floating magnetic head 24 even when it is stationary.

In order to write data in the access state shown in FIG. 8, a magnetic field is modulated by causing a current to flow in the levitation type magnetic head 24 to generate a magnetic field and modulating the current, as in the first embodiment. While moving, at the same time moving optical system 3
By irradiating the surface of the magneto-optical disk 1 with a laser beam in a spotwise manner and heating the recording medium up to near the Curie temperature, data is written by the magnetic field from the floating magnetic head 24. Further, in order to surely write data, even when the moving optical system 3 is moved by the optical system driving actuator 6, the moving optical system 3 and the floating magnetic head 2 are moved.
The relative positional relationship in the magneto-optical disk surface direction of No. 4 is kept constant by the movement of the flying magnetic head driving actuator 7 according to the signal of the sensor unit 8, and the moving optical system 3 is always maintained.
The beam spot position irradiated by is controlled so as to be within the range of the magnetic field necessary for writing data in the magnetic field distribution generated by the floating magnetic head 24.

[Embodiment 4] FIG. 9 shows another example of the state of the floating magnetic head 24 at the origin position. In FIG. 9, 29 indicates a fixed arm. When the floating magnetic head 24 is at the origin, the suspension 13 is supported by the fixed arm 29 instead of the rotating arm, and the floating magnetic head 24 is lifted. FIG. 10 shows a state of the floating magnetic head 24 during access. At the time of access, the suspension type magnetic head 24 is moved away from the fixed arm 29, so that the suspension 13 is released, and the suspension type magnetic head 24 is lowered to the magneto-optical disk surface and is ready for overwriting. At the end, the floating magnetic head 24 returns to the origin position, the suspension 13 is supported by the fixed arm 29, and the floating magnetic head 24 is lifted.

The inventions of claims 5 and 6 are not limited to the above-mentioned third and fourth embodiments, but can be modified in many ways. For example, the rotating arm 25 and the fixed arm 2
A roller may be provided at the front end of the levitation type magnetic head 24 to smoothly move the levitation type magnetic head 24 up and down. In the invention of claim 6, for example, the flying magnetic head driving actuator 7 may be shared with the optical system driving actuator 6 without any problem. Further, the optical system may not be a separate type optical system including the moving optical system 3 and the fixed optical system 4, for example, as shown in FIG.
A configuration using the integrated optical system 30 shown in FIG.

[Embodiment 5] FIG. 12 is a diagram showing the entire structure of an embodiment of a magneto-optical disk drive device according to the present invention. In FIG. 12, 24 is a floating magnetic head, 31 is a bracket, 32 is a solenoid, 33 is a coil spring, and other members such as a magneto-optical disk 1, a spindle 2, a moving optical system 3, a fixed optical system 4, and an optical system. System drive actuator 6, magnetic head drive actuator 7, sensor unit 8, current driver 9, amplifier 10,
The current drivers 11 and 12, the suspension 13, the objective lens 14 and the like have the same functions as those of the same reference numerals shown in FIG.

FIG. 13 is a diagram showing a state of the floating magnetic head 24 at the time of access. On the bracket 28 of the magnetic head 24, the bracket 31 has a rotating shaft 34,
The solenoid 32 connected to the rear end of the bracket 31 makes a rotational movement. In this embodiment, the floating magnetic head 2
4 is lowered to the surface of the magneto-optical disk by the solenoid 32 and the coil spring 33, and the state where overwriting is possible. The levitation type magnetic head 24 is attached to a rotatable bracket 31 via a suspension 13.
The coil spring 33 forms a dead center with respect to the rotational movement of the bracket 31, and holds the attitude of the bracket 31.

FIG. 14 is a diagram showing the state of the floating magnetic head 24 when not accessed. When the solenoid 31 is energized at an arbitrary position, the bracket 31 moves the solenoid 3
2, the posture is maintained by the coil spring 33, and the floating magnetic head 24 is moved by the magneto-optical disk 1.
Be lifted up against. The head lifting device 41 allows the magneto-optical disk 1 to be exchanged because it does not come into contact with the floating magnetic head 24 at any position except during access.

In order to write data in the access state shown in FIG. 13, a magnetic field is modulated by causing a current to flow in the levitation type magnetic head 24 to generate a magnetic field and modulating the current, as in the first embodiment. At the same time, the moving optical system 3 simultaneously irradiates the surface of the magneto-optical disk 1 with a laser beam in a spot manner to heat the recording medium to near the Curie temperature. Write. In addition, the moving optical system 3 uses the optical system driving actuator 6 in order to reliably write data.
Even when moving, the relative positional relationship between the moving optical system 3 and the levitation type magnetic head 24 in the magneto-optical disk surface direction is made constant by the movement of the levitation type magnetic head driving actuator 7 according to the signal of the sensor section 8. The position of the beam spot, which is held and constantly irradiated by the moving optical system 3, is controlled so as to be within the range of the magnetic field necessary for writing data in the magnetic field distribution generated by the floating magnetic head 24. ing.

[Sixth Embodiment] FIG. 15 is a diagram showing another example of the state of the floating magnetic head 24 during access. Figure 1
4, a stepping motor 35 and a wire 36 are provided. Both ends of the wire 36 are connected between the suspension 13 and the stepping motor 35, but in the state shown in FIG. 15, the wire 36 is fed out, and the levitation type magnetic head 24 is lowered to the magneto-optical disk surface so that overwriting is possible. It is in. FIG. 16 is a diagram showing a state of the floating magnetic head 24 when not accessed. As shown in FIG. 16, when the stepping motor 35 is operated at an arbitrary position, the suspension 13 causes the suspension 13 to move through the wire 36.
Since it is wound up by 5, the floating magnetic head 24 is lifted from the magneto-optical disk surface. Therefore, the magneto-optical disk 1 can be replaced because it is not in contact with the floating magnetic head 24 at any position.

The inventions of claims 9 to 11 are not limited to the fifth and sixth embodiments described above, and many modifications can be made. For example, even if the floating magnetic head driving actuator 7 is shared with the optical system driving actuator 6, there is no problem. Also, the optical system does not have to be a separate type optical system including the moving optical system 3 and the fixed optical system 4,
For example, a configuration using the integrated optical system 30 shown in FIG. 17 may be used.

[0041]

As described above, according to the first aspect of the present invention, by mounting the magnetic head and the optical system on the dedicated drive actuators, respectively, it is possible to move them without slowing down the access speed. By controlling the actuator for driving the magnetic head according to the position shift detection by the sensor, even if the optical system moves, the relative positional relationship between the optical system and the magnetic head in the magneto-optical disk surface direction is always maintained. The magnetic field strength at the spot position is secured, and data can be written reliably.
In particular, according to the invention of claim 2, the optical system is divided into a moving optical system and a fixed optical system, and only the moving optical system is moved by the actuator for driving the optical system. Therefore, the load of the actuator is reduced and the access speed is increased. be able to. Further, according to the inventions of claims 3 and 4, the relative positional deviation can be easily detected by the optical sensor or the magnetic sensor.

According to the configuration of the invention of claim 5 or 6,
Even if the magnetic head is a floating type to enable overwriting, the head lifting device supports the floating magnetic head so that it is not in contact with the magneto-optical disk surface except when accessing the magneto-optical disk. Therefore, the magneto-optical disk can be exchanged in the magneto-optical disk drive device using the flying magnetic head by the magnetic field modulation method. Particularly, according to the seventh and eighth aspects of the invention, the magneto-optical disk can be exchanged when the floating magnetic head is at the origin position. Further, according to the inventions of claims 9 to 11, the magneto-optical disk can be exchanged at an arbitrary position.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of a magneto-optical disk drive device according to the present invention.

FIG. 2 is a perspective view showing a connection example of a magnetic head and a moving optical system when an optical sensor is used.

FIG. 3 is a diagram showing a principle of detecting a positional deviation by an optical sensor and a beam.

FIG. 4 is a diagram showing a positional relationship between a magnetic field distribution generated by a magnetic head and a beam spot from a moving optical system.

FIG. 5 is a perspective view showing a connection example of a magnetic head and a moving optical system when a magnetic sensor is used.

FIG. 6 is an overall configuration diagram showing another embodiment of a magneto-optical disk drive device according to the present invention.

FIG. 7 is a perspective view showing a state of the floating magnetic head at the origin position.

FIG. 8 is a perspective view showing a state of the floating magnetic head during access.

FIG. 9 is a perspective view showing another example of the state of the floating magnetic head at the origin position.

FIG. 10 is a perspective view showing a state of the floating magnetic head during access.

FIG. 11 is an overall configuration diagram showing another embodiment of the magneto-optical disk drive device of the present invention.

FIG. 12 is an overall configuration diagram showing another embodiment of the magneto-optical disk drive device of the present invention.

FIG. 13 is a perspective view showing a state of the floating magnetic head during access.

FIG. 14 is a perspective view showing a state of the floating magnetic head when not accessed.

FIG. 15 is a perspective view showing another example of the state of the floating magnetic head during access.

FIG. 16 is a perspective view showing a state of the floating magnetic head when not accessed.

FIG. 17 is an overall configuration diagram showing another embodiment of the magneto-optical disk drive device of the present invention.

FIG. 18 is an explanatory diagram of the principle of overwrite in the magnetic field modulation method.

[Explanation of symbols]

1 Magneto-optical disk 2 spindle motor 3 Moving optical system 4 Fixed optical system 5 magnetic head 6 Optical system actuator 7 Magnetic head drive actuator 8 sensor section 9 current driver 10 amplifiers 11 current driver 12 current driver 13 suspension 14 Objective lens 15 laser beam 16 Optical sensor 16a optical sensor 16b optical sensor 17 beam irradiation device 18 light beams 19 Magnetic field distribution 20 allowable range 21 Magnetic field required for recording 22a Magnetic sensor 22b Magnetic sensor 23 magnets 24 Levitation type magnetic head 25 rotating arm 26 rotation axis 27 spring 28 bracket 29 Fixed arm 30 integrated optical system 31 bracket 32 solenoid 33 coil spring 34 rotation axis 35 stepping motor 36 wires 37 magneto-optical disk 38 Optical system 39 recording media 40 magnetic head 41 Head lifting device 42 bracket 43 Fixed member

Claims (11)

[Claims] 1. In a magneto-optical disk drive device for performing overwriting by a magnetic field modulation method, each of an optical system and a magnetic head has a movable structure driven by a dedicated actuator. A sensor is provided on at least one side, and this sensor detects relative positional deviation in the direction along the magneto-optical disk surface between the optical system and the magnetic head when the optical system is moved,
A magneto-optical disk drive device comprising: a controller for controlling an output to the magnetic head driving actuator according to the detection result to synchronize the position of the optical system with the position of the magnetic head. 2. The optical system comprises an objective lens, a moving optical system including an objective lens driving actuator different from the optical system driving actuator, and a flip-up mirror, and a fixed optical system including other optical components. 2. The magneto-optical disk drive device according to claim 1, wherein 3. The sensor is an optical sensor provided on one side of the optical system or the magnetic head, and a light beam irradiation device for emitting a light beam to the optical sensor is provided on the other side. The magneto-optical disk drive device according to claim 1, which is characterized in that. 4. A magnetic sensor provided on one side of the optical system or the magnetic head, and a magnetic field applying device for applying a magnetic field to the magnetic sensor on the other side. The magneto-optical disk drive device according to claim 1. 5. The magnetic head is a floating magnetic head, the floating magnetic head is lowered to the surface of the magneto-optical disk when the magneto-optical disk is accessed, and the floating magnetic head is moved to the magneto-optical disk when not accessed. 2. The magneto-optical disk drive device according to claim 1, further comprising a head elevating device for elevating the position above the disk surface. 6. A magneto-optical disk drive device for performing overwriting by a magnetic field modulation method using a floating magnetic head, wherein the floating magnetic head is lowered to the surface of the magneto-optical disk when accessing the magneto-optical disk. A magneto-optical disk drive device comprising a head elevating device for raising the floating magnetic head to a position exceeding the magneto-optical disk surface during access. 7. The head lifting device includes a rotary arm provided at the origin position of the floating magnetic head and rotating by a mechanical mechanism in accordance with the movement of the floating magnetic head. The optical disc drive device according to claim 5 or 6. 8. The magneto-optical disk drive device according to claim 5, further comprising a fixed arm fixed to the origin position of the floating magnetic head as the head lifting device. 9. The magneto-optical disk drive device according to claim 5, wherein the head elevating device is capable of elevating the floating magnetic head at an arbitrary position. 10. The head lifting device includes a rotatable bracket having the floating magnetic head attached thereto, and a solenoid and a spring connected to the bracket. Magneto-optical disk drive device. 11. The head lifting device includes a stepping motor fixed to a bracket that moves integrally with the floating magnetic head, and a wire connected between the stepping motor and a suspension of the floating magnetic head. 10. The magneto-optical disk drive device according to claim 9, further comprising: