JPH05225642A - Magneto-optical disk device - Google Patents

Abstract

PURPOSE:To reduce the size of the disk device and simplify the device together with a retracting operation mechanism, to reduce the number of parts and to reduce the cost of a magneto-optical disk device which has interchangeability to two kinds of recording systems which are capable of recording and reproducing information with respect to an optical modulation recording magneto-optical disk and a magnetic field modulation recording magneto-optical disk corresponding to a first generation ISO. CONSTITUTION:In a first bias magnetic field generating device A, its magnetic filed generating section 4 is attached on a floating type slider 5, and by relative motion between the device A and a disk 1 in the cartridge opening section of a magneto-optical disk 1, the slider 5 is supported leaving a required gap between the surface of the disk. A first and a second bias magnetic field generating devices A and B access a recording surface while being opposed to the minute area of a light spot alternately through a link driving device C with respect to the approximately tangential direction to the disk 1 crossed orthogonally to the tracking direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an objective lens driving device for controlling the movement of an objective lens of an optical head in a seek direction, a tracking direction and a focusing direction with respect to a magneto-optical disk as a recording medium, and the above objective. The present invention relates to a magneto-optical disk device including first and second bias magnetic field generators for recording information with different modulation methods on a minute area where a laser beam from a lens forms a light spot.

[0002]

2. Description of the Related Art In this type of magneto-optical disk device, a constant magnetic field is applied to a recording area of the magneto-optical disk by a bias magnetic field generator, and laser light modulated by recording information is applied from the optical head to the recording area. For example, a first-generation I such as a 3.5-inch magneto-optical disk
A structure adapted to a magneto-optical disk for recording by an optical modulation method, which is compliant with SO (hereinafter referred to as ISO), and a constant laser beam is applied from an optical head to a recording area and is modulated by recording information. It is known that a magnetic field is applied from the bias magnetic field generator to the recording area, which is suitable for a magneto-optical disk for recording by a so-called magnetic field modulation method.

A magneto-optical disk device suitable for the former has a structure as shown in FIG. 4, for example. here,
The recording area of the magneto-optical disk 1 is initialized in advance (the magnetization of the magnetic film 1b is uniform), and at the time of recording, a laser beam is emitted from the optical head 2 based on the given recording information. Are irradiated onto the recording area (magnetic film) of the disc 1 in the form of a light spot. As a result, the temperature of the minute region of the light spot rises, and when it rises above the Curie temperature, the magnetization reversal of that portion becomes easy. On the other hand, a bias magnet 3 in which a coil 3b is wound around a yoke 3a is arranged on the opposite side of the disc 1 corresponding to a region on the disc surface where the light spot moves for tracking control of the optical head. Therefore, only the portion irradiated with the laser beam is magnetized in the direction opposite to the initialized magnetization direction. In this way, the magnetization pattern of approximately the same size as the light spot (about 1 μm) is left as information in the magnetic film 1b. The disk 1 has a structure in which the magnetic film 1b is laminated on the substrate 1c, and the protective film 1 is formed thereon.
It has a configuration in which a is formed.

The drawback of this method is that it cannot be recorded once and then overlaid on the recording area. That is,
It is necessary to erase the information before recording again. For this purpose, first, a magnetic field is applied by the bias magnet 3 in a direction opposite to the normal direction, and a laser beam is irradiated so as to scan a light spot over the entire recording area, whereby the magnetic film 1b. Is initialized. Due to such an erasing operation, speeding up of information processing is hindered.

The latter recording method has an advantage that information can be directly overwritten and has been widely used recently (for example,
`` High Speed Over-writable Magneto-Optic Rec '' described in Japanese Journal of Applied Physics. Vol.26.
Ording "). An apparatus of this recording system is shown in FIG.
As shown in FIG.
By irradiating the recording area of with a constant intensity laser beam,
The light spot is continuously scanned, while a modulation magnetic field based on information is applied to the minute area of the light spot by the magnetic head 4 from the opposite side of the disk. In this case, the magnetic head 4 is attached to a flying slider 5, and a load beam 6 such as a metal leaf spring that holds the slider 5 holds the recording surface of the disk 1 by 10 μm.
It is supported with a certain distance. This is because the effective strength of the magnetic field generated in the magnetic head 4 is about 0.1 to 0.2 mm square just below the main pole because the applied current has a high frequency for the purpose of speeding up recording. This is because the magnetic head must be used as close to the disk surface as possible. Then, the slider 5 is levitated by the air flow generated by the rotation of the disk, and the non-contact state is maintained. However, dust or the like drawn into the air flow may enter between the slider 6 and the disk surface and damage the disk surface. Of course, in order to prevent this damage, a material such as a filler is mixed in the magnetic film 1b to form fine irregularities on the surface, or a special protective film 1a is formed on the surface. Such measures alone are not enough.

Therefore, it has already been considered to install both of the above-mentioned bias magnetic field generators in parallel with the magneto-optical disk device. That is, here, with respect to the magneto-optical disk, the objective lens of the optical head is moved in the seek direction,
Objective lens driving device for controlling movement in tracking direction and focusing direction, and first bias magnetic field generating device for applying bias magnetic field for magnetic modulation recording to a minute region where a laser beam from the objective lens forms a light spot A second bias magnetic field generator for applying a light modulating bias magnetic field is provided.

[0007]

However, in the above-mentioned magneto-optical disk device, when the bias magnetic field generator for magnetic field modulation recording is operating, the bias magnetic field generator for the optical modulation magnetic field is the bias magnetic field generator. Since it is configured to be retracted from the operating position of, it is disadvantageous for downsizing and simplification of the device. In particular, the means for detecting the relative position between the objective lens driving device and each bias magnetic field generating device, and the mechanism such as the alignment thereof are complicated, and the structure is inevitably complicated.

[0008]

SUMMARY OF THE INVENTION The present invention has been made based on the above circumstances, and records information on both a first-generation ISO compatible optical modulation recording magneto-optical disk and a magnetic field modulation recording magneto-optical disk. Enabled to play 2
In a magneto-optical disk device compatible with various types of recording methods, the device can be downsized and simplified, and the mechanism for retracting operation can be simplified to reduce the number of parts of the configuration and cost. An object of the present invention is to provide a magneto-optical disk device capable of realizing down.

[0009]

Therefore, according to the present invention,
An objective lens driving device that controls the movement of the objective lens of the optical head in the seek direction, the tracking direction, and the focusing direction with respect to the magneto-optical disk serving as a recording medium, and the minute laser light from the objective lens forms a light spot. In a magneto-optical disk device equipped with a first bias magnetic field generator for applying a magnetic modulation recording bias magnetic field and a second bias magnetic field generator for applying an optical modulation bias magnetic field to a region, In the bias magnetic field generator, the magnetic field generator is attached to a flying slider, and the slider is levitated by a relative motion with respect to the disc in the cartridge opening of the disc through a required space with respect to the disc surface. In addition, the first and second bias magnetic field generators have the structure described above. With respect to the substantially tangential direction of the disc orthogonal to the locking direction, the recording surface of the disc is accessed so as to alternately face the minute region of the light spot via a link drive device. ..

[0010]

As a result, the entire apparatus can be downsized and simplified,
Further, the number of parts of the retracting mechanism can be reduced and the cost can be reduced, and moreover, for the magneto-optical recording medium for optical modulation recording,
Information can be recorded / reproduced on / from a magneto-optical recording medium for magnetic field modulation recording, and versatility as a magneto-optical disk device can be exhibited.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to FIGS. FIG. 1 shows a magneto-optical disk apparatus according to the present invention. Here, a magnetic field modulation type recording bias magnetic field generating apparatus A is used as the first bias magnetic field generating apparatus, and a second bias magnetic field generating apparatus is used. An optical modulation type recording bias magnetic field generator B for recording is equipped as an apparatus.

In the bias magnetic field generator A, the levitation slider 5 mounted with the magnetic head 4 as the bias magnetic field generator is supported by the support member 8a of the link drive device C via the support spring 6 as the load beam. The support member 8a is pivotally supported by a support member 9a of a carriage (not shown) on which an optical system is mounted via a support shaft 10a. Similarly, the bias magnetic field generator B supports the magnetic head 3 as a bias magnetic field generator on a support member 8b of the link drive mechanism C, and the support member 8b is supported by a support shaft 10b. It is configured to be pivotally supported by the supporting member 9b of the carriage.

An interlocking rod 8c is pivotally attached to the lower end of each of the supporting members 8a and 8b, and both supporting members are
The support shafts 10a and 10b are configured to be rotatable. Further, a reciprocating driving means 11 such as a solenoid driving mechanism mounted on the carriage is provided at the end of the interlocking rod 8c. Further, the carriage has an optical head section 2 having an objective lens mounted thereon, and is adapted to handle each magnetic head 4 or 3 when accessing the surface of the disk 1. In this case, each of the support members 8
When a and 8b rotate about the spindle, the magnetic heads 4 and 3 are retracted obliquely upward with respect to the substantially tangential direction (the direction orthogonal to the seek and tracking directions) of the disk 1. As described above, the support structure is set by the link drive device C.

In this embodiment, the magnetic head 3 described above is used.
Is a configuration in which a coil 3b is wound around a main magnetic pole 3c and a yoke 3a connected to the head of the main magnetic pole is provided, and the lower end of the main magnetic pole 3c is always in a minute area of a light spot. It is adapted.

In such a configuration, as shown in FIG.
The magnetic head 3 for light modulation can be opposed to the spot (light spot) where the laser beam from the optical head section 2 is focused, and the reciprocating means 11 works.
As shown in FIG. 2, the magnetic head 4 for magnetic modulation can alternately face the light spot. When the carriage operates in this state, the bias magnetic field generators A and B integrated via the link drive device C are integrated.
However, since it is moved in the seek direction and the tracking direction at the same time, unlike the conventional one in which movement control is performed independently, there is no need for each means such as position detection and position adjustment. Can be realized.

[0016]

As described above, the magneto-optical disk apparatus of the present invention is used for magnetic field modulation recording of a 3.5-inch magneto-optical disk for magneto-optical recording for optical modulation recording compatible with the first generation ISO. Information can be recorded / reproduced on / from a magneto-optical disk, and compatibility as a magneto-optical disk device can be ensured. Further, a magnetic field modulation recording bias magnetic field generator and an optical modulation recording method are used. The retracting bias magnetic field generator is alternately retracted via the link driving device, so that the retracting mechanism can be further simplified, and the both bias magnetic field generating devices are linked to the objective lens driving device. Therefore, the position detecting means, the position adjusting means, etc. can be omitted, the number of parts can be reduced as a whole, and the magneto-optical disk of two kinds of recording methods can be supported at low cost. It is possible to provide a magneto-optical disk apparatus capable.

[Brief description of drawings]

FIG. 1A is a plan view and FIG. 1B is a front view showing a state in which an optical modulation method is adopted in one embodiment of the present invention.

FIG. 2A is a plan view and FIG. 2B is a front view showing a state in which a magnetic modulation method is adopted in the above-mentioned embodiment.

FIG. 3 is a side view showing a mode of use of the above embodiment.

4A and 4B are a plan view and a front view showing a conventional example of a light modulation method in FIGS.

5A and 5B are a plan view and a front view showing a conventional example of a magnetic modulation method in FIGS. 5A and 5B, respectively.

[Explanation of symbols]

 A Bias magnetic field generator for magnetic modulation B Bias magnetic field generator for optical modulation C Link drive device 1 Magneto-optical disk 2 Optical head part 3 Magnetic head 3a Yoke 3b Coil 3c Main magnetic pole 4 Magnetic head 5 Floating slider 6 Leaf spring 8a, 8b Supporting member 8c Interlocking rod 9a, 9b Supporting member 10a, 10b Spindle 11 Reciprocating means

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[Procedure amendment]

[Submission date] November 18, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction content]

The latter recording method has an advantage that information can be directly overwritten and has been widely used recently (for example,
`` High Speed Over-writable Magneto-Optic Rec '' described in Japanese Journal of Applied Physics. Vol.26.
Ording "). An apparatus of this recording system is shown in FIG.
As shown in FIG.
By irradiating the recording area of with a constant intensity laser beam,
The light spot is continuously scanned, while a modulation magnetic field based on information is applied to the minute area of the light spot by the magnetic head 4 from the opposite side of the disk. In this case, the magnetic head 4 is attached to a flying slider 5, and a load beam 6 such as a metal leaf spring that holds the slider 5 holds the recording surface of the disk 1 by 10 μm.
It is supported with a certain distance. This is because the effective strength of the magnetic field generated in the magnetic head 4 is about 0.1 to 0.2 mm square just below the main pole because the applied current has a high frequency for the purpose of speeding up recording. This is because the magnetic head must be used as close to the disk surface as possible. Then, the slider 5 is levitated by the air flow generated by the rotation of the disk, and the non-contact state is maintained. However, dust or the like drawn into the air flow may enter between the slider 6 and the disk surface, damage the disk surface, or cause the slider to be attracted to the disk surface. Therefore,
In order to prevent this damage, mix fillers,
In order to prevent adsorption, it is common practice to form a special protective film 1a having fine irregularities on the surface of the disk. However, since the disk conforming to ISO used for the former optical modulation method does not have such a special protective film, a magnetic head attached to such a slider is used as the bias magnet. Cannot record.

Claims (2)

[Claims] 1. An objective lens drive device for controlling movement of an objective lens of an optical head in a seek direction, a tracking direction, and a focusing direction with respect to a magneto-optical disk as a recording medium, and a laser beam emitted from the objective lens. A magneto-optical disk equipped with a first bias magnetic field generator for applying a magnetic field for magnetic modulation recording and a second bias magnetic field generator for applying a bias magnetic field for optical modulation to a minute region forming a spot. In the device,
In the bias magnetic field generator, the magnetic field generator is attached to a flying slider, and the slider is levitated by a relative motion with respect to the disc in the cartridge opening of the disc through a required space with respect to the disc surface. Further, the first and second bias magnetic field generators are alternately arranged via the link drive device in the substantially tangential direction of the disk orthogonal to the tracking direction. A magneto-optical disk device, characterized in that the recording surface of the disk is accessed so as to face the minute area of the light spot. 2. The bias magnetic field generator, together with the link driving device, is integrated with the objective lens driving device so as to be movable in a seek direction and a tracking direction. The magneto-optical disk device described in 1.