JPH03104069A - Magnetic head loading / unloading device for magnetic field modulation - Google Patents

Abstract

PURPOSE:To always keep non-contact with a recording medium by integrally coupling a displacement enlarging mechanism with a head supporting body when a magnetic head is loaded / unloaded, separating the mechanism at the time of access, and saving the mechanism together with the head out of a disk when the disk is exchanged. CONSTITUTION:The magnetic head supporting body for magnetic field modulation is composed of a slider 2 which loads a magnetic head 1 at the end and floats up on a recording surface, jimbal spring 3 to support the slider 2, and suspension spring 4. The supporting body is joined to a carriage 5 at one end and the carriage 5 is joined to a loading / unloading device 10 equipped with the displacement enlarging mechanism to be driven by a laminated piezoelectric actuator 25. When the magnetic head 1 is loaded / unloaded, the displacement enlarging mechanism is coupled integrally with the head supporting body, the mechanism is separated by a separating / coupling device 30 when the magnetic head is accessed, and the mechanism is saved together with the magnetic head out of the disk by a moving mechanism not shown in a figure when the disk is exchanged.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a load-unload device for a floating magnetic head for magnetic field modulation used in a magneto-optical disk device.

[Conventional technology]

A magneto-optical disk device has a T
A recording film made of a perpendicularly magnetized film such as b-Fe thin film is formed, and a light spot focused by a condensing lens is irradiated onto the magneto-optical recording film through an optical head through a transparent substrate, and at the same time, a bias magnetic field generating coil is used to This is a new file device that records the direction of magnetization of the recording film as data in the area irradiated with a light spot by applying a bias magnetic field perpendicularly to the magneto-optical recording film. It has great characteristics.

In the case of the commonly used light intensity modulation recording method, when rewriting information, a focused laser beam is irradiated while applying an erasing magnetic field to raise the irradiated area to a temperature above the Curie temperature. After that, in the process of cooling the recording film, an erasing operation is performed to uniformly align the direction of magnetization in the direction of the erasing magnetic field, and then a recording magnetic field HW in the opposite direction to the erasing magnetic field is applied, and the laser beam is By turning on and off, information is recorded as the direction of magnetization.

Therefore, since overwriting is not possible, the transfer speed during recording is effectively reduced. On the other hand, if overwriting becomes possible, recording and reproduction can be performed at the same transfer rate, which improves the data transfer rate and makes it applicable to a wider range of fields.

Therefore, several methods have been proposed so far to enable overwriting. One of these methods is a magnetic field modulation recording method.

When rewriting information, the recording film is irradiated with a laser beam focused by a condensing lens, and at the same time, a magnetic head for magnetic field modulation is used to change the information according to the recorded data. By applying a magnetic field, data is recorded as the direction of magnetization of the recording film. However, when recording information, the magneto-optical recording film has a
It is necessary to apply a large magnetic field of about 000e, and it is also necessary to increase the switching speed of the magnetic field in order to increase the recording density. Therefore, a magnetic head for magnetic field modulation attached to a floating head slider, such as that used in magnetic disk drives, is sometimes used. The floating head slider floats above the disk by high-speed airflow generated by the high-speed rotation of the disk, and performs recording by applying a modulating magnetic field while maintaining a small gap between the magnetic head for magnetic field modulation and the magneto-optical recording medium. The floating head slider is held movable in the pitch, roll, and parallel directions by a gimbal spring that allows it to follow the surface runout and surface protrusions of the magneto-optical disk while always maintaining a constant spacing. At the same time, a suspension spring is added to the gimbal spring to control the flying height of the floating head slider and to support the head to move the magnetic field modulation head onto an arbitrary recording track.

FIG. 8 is a side view showing an example of the usage form of a conventional magnetic head mechanism for magnetic field modulation. This magnetic head mechanism for magnetic field modulation includes a slider 2, a gimbal spring 3, a suspension spring 4, a carriage 5, and an optical head 80 including an objective lens 81.

Also, the magneto-optical disk 4 irradiated with the laser beam 82
0 is separated from the magneto-optical recording film 41, the protective layer 42, and the substrate 43.

In such a magnetic head mechanism for magnetic field modulation, the slider 2 is supported by the gimbal spring 3 and the suspension spring 4, and at the same time, the suspension spring 4 is fixed to the carriage 5 at one end thereof. Further, the slider 2 has a structure in which a slight load is applied by the leaf spring effect at the root of the suspension spring 4 in order to stably achieve an appropriate floating amount. The slider 2 is in contact with the surface of the magneto-optical disk 40 when it stops rotating, and when the magneto-optical disk 40 starts rotating and the rotational speed increases, the slider 2 moves ξ over the magneto-optical disk 40 due to the hydrodynamic effect. It levitates depending on the amount of chlorine.

In a magneto-optical disk device using a floating type magnetic field modulation head, the starting/stopping method is such that when the magneto-optical recording medium stops rotating, the floating head slider is placed in contact with the surface of the magneto-optical recording medium. The rotation of the magneto-optical recording medium is started, the floating head slider is levitated as the rotation speed increases, and normal operation is performed, and when the magneto-optical recording medium is stopped, the rotation speed of the magneto-optical recording medium decreases and the floating head slider is landed again on the disk. The so-called contact star + stop (CSS) method is used. In this method, the floating head slider and the magneto-optical recording medium surface contact, slide at low speed, separate, and slide against each other. You will go through each stage of contact.

[Problem to be solved by the invention]

The CSS method has the feature that the structure of the mechanism is simple, but
It has the following problems. In other words, this is the problem of contact and sliding that inevitably occurs during CSS. When the rotational speed of the disk reaches a certain speed or higher, sufficient levitation force is generated in the floating head slider, so that the floating head slider and the magneto-optical recording medium are kept out of contact, but the rotation of the magneto-optical recording medium does not start. Immediately after, the buoyancy force acting on the floating head slider is small, so that a state occurs in which the floating head slider and the magneto-optical recording medium slide while being in contact with each other. Such contact sliding also occurs when the magneto-optical recording medium is stopped, and in this case, the floating head slider transitions from a fluid lubrication state to a contact sliding state.

Floating head sliders are usually made of extremely hard materials such as ceramics, taking into account workability and durability. In contrast, a magneto-optical recording medium has a protective layer provided on its surface to protect the magneto-optical recording layer, but its hardness is smaller than that of a floating head slider. Therefore, there is a problem of friction and wear during contact sliding, and the fine friction and wear particles generated at this time get mixed in between the flying head and the recording medium, and in some cases, obstruct the stable movement of the floating head slider. This may lead to a head crash. Alternatively, frictional wear particles may adhere to the slider, making it impossible to obtain an appropriate flying height.

Furthermore, when performing CSS, there is a possibility that disk interchangeability, which is one of the major characteristics of magneto-optical disk devices, cannot be maintained. SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic head load/unload device for magnetic field modulation that can solve problems such as head crashes caused by contact sliding when a disk starts and stops, and maintains disk replaceability.

[Means to solve the problem]

The present invention involves forming a recording film made of a perpendicularly magnetized film on a transparent disk-shaped substrate, heating the recording film by irradiating it with a laser beam while applying a magnetic field in the perpendicular direction to the recording film, and This is used in a magneto-optical disk device that records the direction of magnetization of the recording film as information. A magnetic field modulating magnetic head for applying the modulating magnetic field is mounted on one end surface of the magnetic head, and the recording film surface is A magnetic head support for magnetic field modulation consisting of a slider floating above and a gimbal spring and a suspension spring that supports this slider is joined to a carriage at one end of this support, and this carriage is used as a rotary or linear positioning actuator. In a magnetic field modulation magnetic head load/unload device applied to a magnetic field modulation magneto-optical disk device having a positioner mechanism formed by joining, the slider is placed on a predetermined track by the operation of the positioner mechanism, and the magnetic field a displacement magnification mechanism that is capable of contacting a portion of the suspension spring of the modulation magnetic head support that faces the magneto-optical disk recording film and is driven by a laminated piezoelectric actuator; and a load for the magnetic field modulation magnetic head. When unloading,
a separation/coupling mechanism that integrally couples the displacement magnification mechanism with the magnetic field modulation magnetic head support and separates it when the magnetic field modulation magnetic head is accessed; It is characterized by having a moving mechanism for retracting the vehicle.

[Effect]

According to the magnetic headronide unloading device for magnetic field modulation of the present invention, the magnetic head support for magnetic field modulation consisting of a slider, a gimbal spring supporting it, and a suspension spring is joined to a data arm at one end thereof. , on the part of the suspension pan facing the magneto-optical disk surface,
By providing a displacement magnification mechanism at a contactable position and driving this displacement magnification mechanism with a laminated piezoelectric actuator, when applying or removing voltage to the laminated piezoelectric actuator, the expansion and contraction of the laminated piezoelectric actuator can be performed. can be expanded to a relatively large movement by a displacement amplification mechanism, and the lubricated surface of the slider is set away from the magneto-optical disk surface while the magneto-optical disk is stopped, and when the magneto-optical disk starts and rotates steadily. Apply voltage to the laminated piezoelectric actuator after reaching the speed,
By bending the portion of the displacement magnifying mechanism that contacts the suspension spring toward the disk, the lubricated surface of the slider is brought closer to the rotating magneto-optical recording medium, and the slider is loaded onto the surface of the magneto-optical disk. In addition, the voltage applied to the laminated piezoelectric actuator is removed from this state, and as a result, the displacement of the laminated piezoelectric actuator is removed, and when the magneto-optical disk is stopped, a suspension spring is applied to the magnetic head support for magnetic field modulation. The slider is unloaded by raising a portion of the displacement magnifying mechanism. As described above, by using the magnetic head load/unload device for magnetic field modulation of the present invention, the floating head and the magneto-optical disk are always kept in non-contact even when the magneto-optical disk starts or stops. This can solve problems such as friction and wear.

Furthermore, when accessing the magnetic field modulating magnetic head to the disk, such as when recording data, the magnetic field modulating magnetic head support and the magnetic field modulating magnetic head loading/unloading device are separated, and the magnetic field modulating magnetic head By moving only the magneto-optical head in conjunction with the magneto-optical head, the magnetic head load-unload device for magnetic field modulation of the present invention does not cause problems such as slow access speed.

Furthermore, when replacing the disk, the magnetic head for magnetic field modulation and the magnetic head load/unload device for magnetic field modulation are integrated and moved to the outside of the disk, making it possible to easily realize disk exchange. .

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of a magnetic head load-unload device for magnetic field modulation according to the present invention. Here, for example, by one laminated piezoelectric actuator,
A magnetic field modulation magnetic head loading/unloading device configured to load and unload one magnetic field modulation magnetic head support will be described.

In the magnetic field modulation magnetic head load/unload device 10 shown in FIG. 1, a laminated piezoelectric actuator 25 has one end that is displaced by the application of a voltage fixed in a housing 20 having relatively strong rigidity, and on the other hand, The other end of the laminated piezoelectric actuator 25 is a base 26
is combined with Here, the housing 20 has an approximately U-shape, and one end thereof is substantially flush with one end of the base 26.

A fulcrum-side hinge 22 is provided on a surface of the housing 20 that is substantially flush with the base 26 . This fulcrum side hinge 22 needs to be firmly connected to the housing 20, and therefore it is effective to have an integral structure with the housing 20. The fulcrum side hinges 22 are formed symmetrically on both arms of the U-shaped housing 20. The base 26 also includes a laminated piezoelectric actuator 25.
An active side hinge 21 is provided on the side opposite to the side joined to. In this case as well, it is effective to be integrated with the base 26. Fulcrum side hinge 22 and action side hinge 2
It is not on the same plane as l, but is configured with a certain level difference. Further, two of the fulcrum-side hinges 22 and one of the active-side hinges 2l form a set, and one end of each is coupled to the enlargement lever 23. In this case as well, it is effective that each hinge and the enlargement lever 23 are of integral construction.

Further, at one end of each of the enlargement levers 23, a pin 24 is provided which comes into contact with a magnetic field modulating magnetic head support (not shown).

FIG. 2 is a side cross-sectional view taken along a neutral line for explaining the operation of the magnetic head load-unload device for magnetic field modulation of this embodiment. As explained in FIG. 1, the working side hinge 2l is joined to the base 26, and the fulcrum side hinge 22 is joined to one end of the housing 20, which is not visible in the figure. Here, when a voltage is applied to the laminated piezoelectric actuator 25 by a voltage supply means (not shown), the laminated piezoelectric actuator 25 expands in the X direction shown in FIG.

At this time, assuming that the housing 20 that supports the laminated piezoelectric actuator 25 is firmly fixed to the outside, most of the deformation of the laminated piezoelectric actuator 25 is caused by the base 26 because the housing 20 has high rigidity. Occurs on the side.

Therefore, in FIG. 2, the base 26 is displaced in the X direction. Here, since the fulcrum side hinge 22 is fixed to the housing 20 and the working side hinge 2l is fixed to the base 26, the working side hinge 21 moves in the X direction relative to the fulcrum side hinge 22. .

Next, paying attention to the expansion lever 23, the expansion lever 23 is connected to both the action side hinge 2l and the fulcrum side hinge 22, and each hinge moves as described above. One end is the fulcrum side hinge 22
and receives a moment from the working side hinge 2l. Therefore, as can be easily understood, the other end of the expanding lever 23 on the side connected to the hinge moves in the Z direction shown in FIG.

The amount of displacement in the Z direction of the open end of the enlarged lever 23 is determined by the separation distance in the Z direction of the working side hinge 21 and the fulcrum side hinge 22 connected to each enlarged lever 23 and the X direction of the enlarged lever 23.
It is roughly determined by the ratio to the length in the direction.

That is, the Z-direction displacement of the open end of the expansion lever 23 is smaller than the displacement amount of the laminated piezoelectric actuator 25, and the expansion ratio increases as the distance between both hinges becomes shorter and the length of the expansion lever 23 becomes longer. Since the displacement amount of the commonly used laminated piezoelectric actuator 25 is about 10 to 20 microns for a voltage of approximately 100V, for example, by increasing this magnification factor to 20 times, the open end of the expansion lever 23 can be The displacement in the Z direction can be 200 to 400 microns per 100 square meters. It is clear that this amount of displacement is sufficient to displace a part of the suspension spring that supports the magnetic field modulating magnetic head support and to realize loading and unloading of the magnetic field modulating magnetic head.

FIG. 3 is a plan view illustrating an example of application of the embodiment of FIG. 1 to an actual magneto-optical disk device. The magnetic head support 1 for magnetic field modulation is fixed at one end to the carriage 5, and the slider 2 is moved along a head seek trajectory 45 to the same position as the magneto-optical head (not shown) by a positioner actuator (not shown). be. In FIG. 23, it is assumed that the slider 2 is on track on the load-unload track 44 on the outer circumferential side of the magneto-optical disk 40.
In this state, the magnetic field modulating magnetic head support 1 and the magnetic field modulating magnetic head load/unload device 10 are coupled by the coupling/separating device 30. For example, a coupling rod 31 attached to the magnetic head load/unload device 10 for magnetic field modulation is inserted into a hole 32 provided in a magnetic head support l for magnetic field modulation, and the magnetic field is modulated by a coupling command signal (not shown). The magnetic head support 1 for magnetic field modulation and the magnetic head load/unload device 10 for magnetic field modulation are combined and integrated.

And a magnetic head loading/unloading device W1 for magnetic field modulation.
The pin 24 that controls the magnetic field modulation magnetic head support 1
It has a structure in which the suspension spring 4 that constitutes the slider 2 overlaps the suspension spring 4 on the side where the slider 2 is present. As explained using FIG. 2, in this state, by raising and lowering the pin 24, the suspension spring 4 in contact with the pin 24 moves up and down, and at this time, the suspension spring 4 has one end fixed to the carriage 5. Therefore, it goes without saying that in the slider 2, the amount of displacement of the bin 24 is further expanded and it can be moved up and down.

Therefore, the minute displacement of the laminated piezoelectric actuator 25 is greatly expanded, and as a result, the slider 2 can be unloaded sufficiently away from the surface of the magneto-optical disk 40, and the slider 2 and the magneto-optical disk due to disturbances during unloading can be The possibility of contact with disk 4o is extremely small.
Therefore, there is no need to provide a CSS file area like that provided in a magnetic disk device, and there is no need to reduce the data area. Figure 4(a). (b) is a side view for explaining in more detail the operation of the magnetic head load-unload device for magnetic field modulation according to the present embodiment. In FIG. 4, parts unnecessary for explanation are omitted. First, Figure 4 (a) shows a state in which no voltage is applied to the laminated piezoelectric actuator (not shown)
), that is, when the magnetic field modulation magneto-optical disk device is not operating, there is no deflection between the pins 24. In this state, the suspension spring 4 has previously undergone a slight deformation, so that the slider 2 has been unloaded from the magnetic disk 40. After the magnetic field modulation magneto-optical disk device starts operating, by applying a voltage to the laminated piezoelectric actuator (not shown), the bin 24 moves as shown in FIG.
) is displaced by d as shown in (). In this state, pin 2
4 and the suspension spring 4 are out of contact with each other, and the slider 2 is loaded onto the magneto-optical disk 40. In this embodiment, it is necessary to constantly apply voltage to the laminated piezoelectric actuator during operation of the magnetic field modulation magneto-optical disk device, but almost no current flows through the laminated piezoelectric actuator during deformation holding operation, and during load/unload operation. It goes without saying that by adjusting the speed of the inrush current during displacement, the inrush current can be set to a small value without causing any trouble to the device structure.

Furthermore, as is well known, a predetermined load is applied to the slider 2 by the suspension spring 4, so a force of several tens of grams is required to overcome the load and perform the unloading operation. It goes without saying that the laminated piezoelectric actuator used in the example generates an extremely large force, and therefore can perform a sufficient unloading operation.

FIG. 5 is a plan view illustrating a case where the embodiment of FIG. 1 is applied to an actual magneto-optical disk device, and a case where a magnetic head for magnetic field modulation is accessed. The magnetic field modulating magnetic head support 1 and the magnetic field modulating magnetic head loading/unloading device W10 are separated by a coupling/separating device 30. For example, the connection between the coupling rod 31 attached to the magnetic field modulation magnetic head load/unload device 10 and the hole 32 provided in the magnetic field modulation magnetic head support l is cut off by a separation command signal (not shown). The magnetic head support 1 for magnetic field modulation and the magnetic head load/unload device IO for magnetic field modulation are separated. The magnetic field modulating magnetic head support l moves along a head seek locus 45 in conjunction with a magneto-optical head (not shown). In this way, when accessing the magnetic head support 1 for magnetic field modulation, the load/unload device 10 has no influence on the magnetic head support 1 for magnetic field modulation, and the problem of reduced access speed does not occur.

FIG. 6 is a plan view illustrating a case where the embodiment of FIG. 1 is applied to an actual magneto-optical disk device, in which a magneto-optical disk is replaced. As explained in FIG. 3, the magnetic head support 1 for magnetic field modulation and the magnetic head load/unload device 10 for magnetic field modulation are coupled by the coupling/separation device 30, and the magnetic head support 1 for magnetic field modulation is connected to the magneto-optical disk. When exchanging the magneto-optical disk after unloading it from the magneto-optical disk 40, the integrated magnetic field modulation magnetic head support 1 and magnetic field modulation magnetic head load/unload device 10 are moved by a moving mechanism 60 such as a rack binion to the magneto-optical disk. Move and evacuate outside of 40. By doing this, it becomes possible to easily replace the magneto-optical disk, and it becomes possible to maintain disk exchangeability, which is one of the major characteristics of optical disks.

FIG. 7 is a side view showing an example of a magnetic field modulation magneto-optical disk device equipped with the embodiment shown in FIG. Further, this magnetic field modulation magneto-optical disk device includes a magnetic field modulation magnetic head 1, a slider 2, a jimpal spring 3, a suspension spring 4, a carriage 5, a coupling section 70, and a magneto-optical head positioner actuator 71. and a magneto-optical head 80 having an objective lens 81.

Also, the magneto-optical disk 4 is irradiated with the laser beam 82.
0 is present from the recording film 4l, the protective layer 42, and the substrate 43.

In such a magnetic field modulation magneto-optical disk device, the magnetic field modulation magnetic head support 1 and the magneto-optical head 80 are coupled at a coupling portion 70, and are integrated and interlocked by a magneto-optical head positioner actuator 7l.

Furthermore, in the magnetic head load/unload device for magnetic field modulation of the present invention, contact between the bottle and the suspension spring is unavoidable, but by using ceramic for the contact portion, the wear resistance of the contact portion can be improved. Also, as a result,
The risk of head crash can be reduced, and by making the abutment part a tapered surface in the slider seek direction, it is possible to unload the slider while seeking, and as a result, the magnetic head support By moving the slider to the outside of the magneto-optical disk by the inertial force applied to the magnetic field modulation magneto-optical disk device, it is possible to further improve the shock resistance of the magnetic field modulation magneto-optical disk device when it is not in operation.

〔Effect of the invention〕

As explained above, the magnetic head load/unload device for magnetic field modulation of the present invention sets the slider and magneto-optical disk in a non-contact state when the magneto-optical recording disk is stopped, and rotates the disk. By loading or unloading the slider onto the magneto-optical disk after the number of revolutions reaches the rated number of rotations, the magneto-optical recording medium and the magnetic head can always be kept out of contact with each other. Problems such as sliding and adsorption can be avoided, and when the magnetic head for magnetic field modulation is accessed, the problem of reduced access speed can be avoided by separating the magnetic head for magnetic field modulation and the magnetic head load/unload device for magnetic field modulation. At the same time, after unloading, the slider is firmly held by contact between the suspension spring and the pin, and when replacing the disk, the magnetic field modulation magnetic head loading/unloading device is moved and retracted to the outside of the disk along with the magnetic field modulation magnetic head. This ensures sufficient equipment reliability even when the equipment is not in operation.
It is possible to easily maintain the non-contact and disc interchangeability, which are major features of optical discs.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the magnetic head load/unload device for magnetic field modulation according to the present invention, FIG. 2 is a side view of the embodiment of FIG. FIG. 4 is a side view illustrating the operation of the embodiment shown in FIG. 1; FIG. 5 is a plan view when accessing the magnetic head for magnetic field modulation of the embodiment shown in FIG. 6 is a plan view when replacing the magneto-optical disk of the embodiment of FIG. 1, FIG. 7 is a side view of the magnetic field modulation magneto-optical disk device using the embodiment of FIG. 1, FIG. 8 is a side view illustrating the usage state of a conventional magnetic field modulation magneto-optical disk device. 1... Magnetic head for magnetic field modulation 2... Slider 3... Gimbal spring 4... Suspension spring 5... Carriage lO... For magnetic field modulation Magnetic head loading/unloading device 20... Housing 21... Acting side hinge 22... Fulcrum side hinge 23... Enlargement lever 24... Pin 25... ...Laminated piezoelectric actuator 26...
・Base 30...Coupling/separation device 31...Coupling rod 32...Hole Magneto-optical disk recording film protective layer Substrate Loading/unloading Track Head seek Locus movement mechanism Coupling unit Magneto-optical head positioner actuator 80...Magneto-optical head 8l...Objective lens 82...Laser beam 40. 4l. 42. 43. 44. 45. 60. 70. 71.

Claims (1)

[Claims] (1) A recording film made of a perpendicularly magnetized film is formed on a transparent disk-shaped substrate, and while a magnetic field is applied perpendicularly to this recording film, the recording film is irradiated with laser light to heat it. It is used in a magneto-optical disk device that records the direction of magnetization of a recording film as information, and is equipped with a magnetic field modulating magnetic head that applies the modulating magnetic field on one end surface, and uses a fluid flow to generate information on the recording film surface. A magnetic head support for magnetic field modulation, which consists of a slider that flies, a gimbal spring and a suspension spring that supports this slider, is connected to a carriage at one end of this support, and this carriage is connected to a rotary or linear positioning actuator. In the magnetic head load/unload device for magnetic field modulation applied to a magnetic field modulation magneto-optical disk device having a positioner mechanism, the slider is placed on a predetermined track by the operation of the positioner mechanism. a displacement amplifying mechanism that is capable of contacting a portion of a suspension spring of a magnetic head support body facing a magneto-optical disk recording film and is driven by a laminated piezoelectric actuator; When loading,
a separation/coupling mechanism that integrally couples the displacement magnification mechanism with the magnetic field modulation magnetic head support and separates it when the magnetic field modulation magnetic head is accessed; 1. A magnetic head loading/unloading device for magnetic field modulation, comprising a moving mechanism for retracting the magnetic head.