JP2001256690A - Magneto-optical recording head device, magneto-optical recording device and support device for the magnetic head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide magneto-optical recording head device, which is capable of enhancing generation efficiency of magnetic field by lessening the cause that a magnetic head core diameter increases. SOLUTION: A suspension 2 consists of a thin leaf spring of metal, disposed with two constitution parts 2a and 2b (which are an upper spring 2a and a lower spring 2b) varying in thickness and/or material in the state of mutually negating the displacing quantity of the magnetic head 4 generating to the changes in the thickness direction of the magnetic head 4. The upper spring 2a and lower spring 2b are varied in the thickness and/or material, in order to vary their spring constants. A fixed load pressure is exerted to the magnetic head 4 via a slider 3. More specifically, the suspension 2 is formed by making a spring constant k2 of the lower spring 2b on a side of a shorter length larger than a spring constant k1 of the upper spring 2a of the side of the longer length.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical recording head apparatus having an optical head and a magnetic head for applying a load (load as a load pressure) to a disk-shaped recording medium during recording / reproducing, and the magneto-optical recording head apparatus. The present invention relates to a magneto-optical recording device comprising: The invention also relates to a support mechanism for a magnetic head that applies a load to a disk-shaped recording medium during recording.

[0002]

2. Description of the Related Art A conventional magneto-optical recording head device comprises a magnetic head disposed on one side of a magneto-optical disk and an optical head disposed on the other side of the magneto-optical disk. The portion to which the magnetic field from the head is applied is irradiated with light from the optical head to record information such as audio and video on the magneto-optical disk.

FIG. 7 schematically shows the arrangement and movement of a magnetic head 32 attached to a slider 31 at the tip of a suspension 30 and an optical head 33.

The suspension 30 and the optical head 33 are connected and sought by a support mechanism 34, and both the optical head 33 and the magnetic head 32 are simultaneously operated in the seek direction S.

[0005] The optical head 33 has an objective lens 35 for focusing / tracking 2 indicated by an arrow T / F.
An actuator mechanism for driving in the direction is provided, and the tracking direction T and the focus direction F of the objective lens 35 can be adjusted. Tracking and focusing at the time of recording and reproduction are performed by current control for the coils 36 and 36 of the actuator.

Incidentally, in a disk drive device using the above-described magneto-optical recording head device, it is desirable that the recording magnetic field be large from the viewpoint of the stability of the high-density recording mark with the increase in the recording density and the transfer rate. Considering the power consumption, heat generation, and frequency characteristics of the magnetic head, it is desirable to reduce the recording magnetic field current. In order to satisfy these requirements, it is effective to increase the efficiency of the magnetic head structure and reduce the magnetic field generation area.

[0007]

However, in the above-mentioned disk drive device, several 100 μm × several tens of μm are required in order to secure a margin of a relative position with respect to a light spot on a magneto-optical disk.
A magnetic field must be generated in the range of 0 μm. This is because the horizontal position of the core of the recording portion of the magnetic head varies greatly depending on the height of the disk as an element that determines the range of the relative position.

The details will be described below. In the configuration described above with reference to FIG. 7, the relative position between the optical pickup 33 and the magnetic head 32 changes when the disk height changes due to surface runout or the like even when adjusted during assembly of the apparatus.

FIG. 8 viewed from the side of FIG. 7 will be described below.

The horizontal position of the core of the recording portion of the magnetic head 32 is determined by the movable distance L and the height Z of the suspension 30. That is, at the horizontal distance Y, there is a relationship of L ² = Y ² + Z ² , and the change Δ
When there is Z, the change ΔY of the horizontal position Y is as follows: ΔY = sqr ｛L ² − (Z−ΔZ) ² ｝ −sqr ｛L ² − (Z +
ΔZ) ² ｝.

Here, for example, L = 25 mm, Z = 3 mm,
If ΔZ = 0.5 mm, ΔY = ± 0.06 mm (60 μm
m). In order for the change to be covered by the magnetic field range, the size of the magnetic field core needs to be at least 100 μm or more.

That is, as schematically shown in FIG. 9, the magnetic field application area MA of the magnetic head 32 is Mrad (μm) in the disk radial direction and Mtan (μm) in the track line direction from the core center 32a. Has Mrad (μ
m) = 100 μm and Mtan (μm) = 80 μm.

On the other hand, Japanese Patent Application Laid-Open No. 4-106747 discloses
Japanese Patent Application Laid-Open No. 5-282732 or Japanese Patent Application Laid-Open No. 11-232719 proposes control of a relative position using a light spot or a magnetic head.

For example, Japanese Patent Application Laid-Open No.
The magneto-optical recording head disclosed in Japanese Patent No. 6747 has position adjusting means for adjusting the position of the optical head, and position detecting means for detecting the position of the optical head and supplying the position detection output to the position adjusting means. Then, the reference level of the position detecting means is adjusted so that the portion of the magneto-optical recording medium to which the magnetic field from the magnetic head is applied is irradiated with light from the optical head. However, the mechanism became complicated, resulting in an increase in cost and an increase in the size of the mechanism.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and realizes downsizing with a simple mechanism, suppresses an increase in cost, reduces a factor for increasing the diameter of a magnetic head core, and reduces the magnetic field generation efficiency. It is an object of the present invention to provide a magneto-optical recording head device, a magneto-optical recording device, and a support mechanism for a magnetic head, which can increase the recording speed.

[0016]

According to the present invention, there is provided a magneto-optical recording head device comprising: an optical head having an objective lens; and a magneto-optical recording head device having a magnetic head. And / or a suspension comprising a leaf spring in which at least two components having different materials are arranged in such a manner that the horizontal displacement of the magnetic head, which is caused by a change in the thickness direction of the magneto-optical disk, is canceled out. Are arranged so as to give a constant load pressure to the vehicle.

Here, the two components constituting the suspension have different thicknesses and / or materials in order to have different spring constants. Therefore, the two components having different spring constants cancel each other out the displacement amount.

According to another aspect of the present invention, there is provided a magneto-optical recording head device comprising: an optical head having an objective lens; and a magneto-optical recording head device having a magnetic head. Is a linearly movable elastic member.

In order to solve the above-mentioned problems, a magneto-optical recording device according to the present invention includes a disk rotation drive mechanism for mounting and rotating a magneto-optical disk, a magneto-optical recording head device having an optical head and a magnetic head, and A magneto-optical recording device for recording an information signal on the magneto-optical disk, wherein the magneto-optical recording head device is configured to determine a horizontal displacement amount of the magnetic head that occurs with respect to a change in a thickness direction of the magneto-optical disk. A constant load pressure is applied to the magnetic head by a suspension composed of a leaf spring having at least two components having different thicknesses and / or materials arranged so as to cancel each other.

In order to solve the above-mentioned problems, a magneto-optical recording apparatus according to the present invention includes a disk rotation drive mechanism for mounting and rotating a magneto-optical disk, and a magneto-optical recording head apparatus having an optical head and a magnetic head. In the magneto-optical recording device for recording an information signal on the magneto-optical disk, the magneto-optical recording head device uses a linearly movable elastic member as a suspension for applying a constant load pressure to the magnetic head.

In order to solve the above-mentioned problems, a magnetic head support device according to the present invention is a magneto-optical recording device for recording an information signal on a magneto-optical disk, wherein the magneto-optical disk is mounted on an optical head having an objective lens. In the magnetic head supporting device disposed opposite to the magnetic head, the magnetic head has a thickness arranged such that a horizontal displacement of the magnetic head that occurs with respect to a change in the thickness direction of the magneto-optical disk is canceled each other. And / or a suspension composed of a leaf spring having at least two components made of different materials is supported so as to apply a constant load pressure.

According to another aspect of the present invention, there is provided a magnetic head supporting apparatus for recording information signals on a magneto-optical disk, wherein the magneto-optical disk is mounted on an optical head having an objective lens. In the magnetic head supporting device opposed to the magnetic head, the magnetic head is supported by a suspension made of a linearly movable elastic member so that a constant load pressure is applied.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. The magneto-optical recording head device according to this embodiment records information such as audio and video on a magneto-optical disk by a magnetic field modulation overwrite method. FIG. 1 schematically shows a suspension 2 as a specific example of a magnetic head support device according to the present invention. Further, FIG. 1 schematically shows the arrangement and movement of the suspension 2, the magnetic head 4 supported via the slider 3, and the optical head 5.

That is, one surface 1 of the magneto-optical disk 1
A magnetic head 4 attached to a slider 3 supported by the suspension 2 is disposed on the a side, and an optical head 5 is disposed on the other surface.

As shown in the enlarged side view of FIG. 2, the suspension 2 generates two components 2a and 2b having different thicknesses and / or materials in response to a change in the thickness direction of the magneto-optical disk 1. It is composed of a thin metal leaf spring arranged so that the horizontal displacement of the magnetic head cancels each other. Thereafter, the two components 2a and 2b are connected to the upper spring 2
a and the lower spring 2b. The upper spring 2a and the lower spring 2b have different thicknesses and / or materials in order to change the spring constant. Then, a constant load pressure is applied to the magnetic head 4 via the slider 3.

More specifically, the suspension 2 is formed by setting the spring constant k2 of the shorter lower spring 2b to be larger than the spring constant k1 of the longer upper spring 2a.
Details of the suspension 2 will be described later.

The suspension 2 and the optical head 5 are connected by a support mechanism 6 and are sought by a carriage. Both the optical head 5 and the magnetic head 4 are simultaneously operated in the seek direction S.

The optical head 5 has its objective lens 7
Of focus / tracking indicated by arrow F / arrow T
And an actuator mechanism for driving the objective lens 7 in a tracking direction T and a focus direction F.
Can be adjusted. Tracking and focusing at the time of recording and reproduction are performed by current control for the coils 8, 8 of the actuator.

As shown in FIG. 3, the magneto-optical disk 1 is formed by sequentially laminating a dielectric film layer 1b, a signal recording film layer 1c, and a protective film layer 1d on a substrate 1a. The substrate 1a is formed of a transparent synthetic resin such as polycarbonate. The dielectric film layer 1b is formed of SiO ₂ . The signal recording layer film 1c is made of a magneto-optical material, for example, TbF
e, GdTbFe, GdFeCo and the like. The protective film layer 1d is formed of a UV (ultraviolet) curable resin (hereinafter, simply referred to as UV). Protective film layer 1d
After forming a dielectric film layer 1b and a signal recording film layer 1c on the substrate 1a in units of microns, a UV-based paint is applied on the signal recording layer 1c and rotated at a high speed.
The paint is formed by applying a UV ray and curing the paint after having a uniform thickness.

A disk drive device 11 having the magneto-optical recording head device shown in FIG. 1 as a specific example of the magneto-optical recording device of the present invention rotates the magneto-optical disk 1 as shown in FIG. And a disk rotation drive mechanism 12 including a disk table, a spindle motor, and the like.

The optical head 5 is arranged on the lower surface side of the magneto-optical disk 1 which is rotationally driven by the disk rotation driving mechanism 12, and is used for recording and / or reproducing information signals on the magneto-optical disk 1. Irradiate a laser beam.

The optical head 5 and the magnetic head 4 are connected by the support mechanism 6 and are moved by the carriage 13 in the radial direction of the magneto-optical disk 1. The suspension 2 arranged on the upper surface of the magneto-optical disc 1 is attached to the support mechanism 6 so as to sandwich the magneto-optical disc 1 between the support mechanism 6 and the optical head 5.

The slider 3 is attached to the tip of the suspension 2 so as to be pressed against the protective film layer 1d of the magneto-optical disk 1 with a predetermined load F by the spring force of the suspension 2.

The magnetic head 4 for applying an external magnetic field to the signal recording film layer 1c of the magneto-optical disk 1 is attached to the center of the slider 3 so as to face the optical head 5 immediately below the slider.

In the disk drive device 11, the slider 3 applies a magnetic field while the magnetic head 4 is floating or in contact with the disk surface. Then, the laser beam of the optical head 5 is applied to the signal recording film layer 1c of the magneto-optical disk 1 to overheat to the Curie temperature or higher,
When an external magnetic field is applied to the signal recording film layer 1c of the magneto-optical disk 1 by the magnetic head 4 provided on the slider 3, the signal recording layer 1c, which has been overheated by the laser beam and has lost its coercive force, The direction of magnetization is reversed following the external magnetic field, and a signal is recorded.

Next, the suspension 2 of the magneto-optical recording head device will be described with reference to FIG. The suspension 2 is formed by folding two springs having different lengths / spring constants, that is, an upper spring 2a and a lower spring 2b.

That is, the suspension 2 includes an upper spring 2a having a spring constant k1 and a length L1, and a lower spring 2b having a spring constant k2 and a length L2 (L1> L2). The suspension 2 composed of the upper spring 2a and the lower spring 2b presses the magnetic head 4 attached to the slider 3 against the magneto-optical disk 1 with the load pressure F.

Assuming that the amount of deflection in the vertical directions Z1 and Z2 applied to the upper spring 2a and the lower spring 2b of the suspension 2 by the load pressure F is ΔZ1 and ΔZ2,
Z1 and ΔZ2 are as follows: ΔZ1 = k1 × F ΔZ2 = k2 × F

Here, the displacement amounts ΔY1 and ΔY of the upper spring 2a and the lower spring 2b in the horizontal Y1 and Y2 directions due to the deflection amounts ΔZ1 and ΔZ2 in the vertical directions Z1 and Z2.
2 is ΔY1 ² = L1 ² − (Z1−ΔZ1) ² ΔY2 ² = L2 ² − (Z2−ΔZ2) ² .

In order that the horizontal direction of the mounting portion (tip of the lower spring) x of the suspension 2 with the slider 3 is not displaced by the vertical deflection, ΔY1 ² = ΔY2 ^2, that is, L1 ² − (Z1−ΔZ1) ² = L2 ² − (Z2−ΔZ2) ² (k1 ² −k2 ² ) F ² −2 (k1Z1−k2Z2) F +
(Z1 ² -Z2 ² -L1 ² + L2 ² ) = 0, and F = [｛(Z1 ² -Z2 ² -L1 ² + L2 ² ) ± sqrt (k1
^{Z1-k2Z2) 2-4 (k1 2} -k2 2) × (Z1 2 -
Z2 ² −L1 ² + L2 ² )｝] / 2 × (k1 ² −k2 ² ).

That is, a change ΔY in the horizontal direction caused by a displacement in the height (thickness) direction Z of the magneto-optical disk 1
There are combinations in which the polarity is reversed and the displacement is canceled out by the combination of the length and the spring constant. Therefore, it can be seen that the values of the spring constants k1 and k2 that satisfy the above equation may be selected.

More specifically, the suspension 2 is preferably formed by setting the spring constant k2 of the lower spring 2b having a shorter length to be larger than the spring constant k1 of the upper spring 2a having a longer length. As a result, the upper spring 2a and the lower spring 2b act so as to cancel each other's horizontal displacement, so that a change in the horizontal position of the magnetic head 4 with respect to a change in the height of the magneto-optical disk 1 can be suppressed. it can.

As the suspension, FIG.
As shown in the figure, the slider 3 with the magnetic head 4 attached
The lower springs 21b, 22b of the suspensions 21, 22 similar to those shown in FIG.
Are connected symmetrically to the lower ends 23, 24 of the upper springs 21a,
A double-supported double suspension structure in which the upper ends 25 and 26 of the 22a are connected to the distal end of the support arm 27 may be used. Since the structure of each of the suspensions 21 and 22 of the double suspension structure is the same as the structure shown in FIG. 2, a change in the horizontal position of the magnetic head 4 with respect to a change in the height of the magneto-optical disk 1 can be suppressed. . Further, since the suspension has a symmetrical double structure, the horizontal displacement of the suspensions 21 and 22 can be canceled each other.

As the suspension, FIG.
As shown in the figure, the slider 3 with the magnetic head 4 attached
May be used, an elastic member that linearly rebounds only in the vertical direction indicated by the arrow U, for example, a linear elastic type suspension attached to the distal end of the arm 27 by the coil spring 28. According to this linear elastic suspension, it is possible to suppress the occurrence of a shift in the horizontal direction with respect to the displacement in the height direction Z of the disk.

The suspension having the shape shown in FIGS. 1, 2 and 5 is formed by bending an upper spring and a lower spring at a boundary portion having a different thickness from a single leaf spring having a different thickness. It may be formed by joining two components having different thicknesses and / or materials, that is, an upper spring and a lower spring.

In the suspension having the shape shown in FIGS. 1, 2 and 5, the upper spring and the lower spring are each linear as shown, but may be arc-shaped.

The present invention suppresses a change in the horizontal position with respect to a change in the height due to the runout of the magneto-optical disk. Each type in which the track direction or the radial direction is the horizontal direction, for example, Needless to say, the present invention can be applied to a magneto-optical head device for a mini disk, a magneto-optical head device for an MO disk, and the like.

[0048]

According to the present invention, the size of the magneto-optical recording head device can be reduced with a simple mechanism, the factor for increasing the diameter of the magnetic head core can be reduced, and the efficiency of generating the magnetic field can be reduced while suppressing the cost increase. Can be raised. Similarly, the magneto-optical recording device including the magneto-optical recording head device can be downsized and the efficiency of generating a magnetic field can be increased.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a suspension as a specific example of a magnetic head support device of a magneto-optical recording head device according to the present invention.

FIG. 2 is an enlarged side view of the suspension.

FIG. 3 is a sectional view of a magneto-optical disk.

FIG. 4 is a diagram showing a configuration of a disk drive device including a magneto-optical recording head device.

FIG. 5 is a view showing a double-supported double suspension as another specific example of the suspension.

FIG. 6 is a view showing a linear elastic suspension as another specific example of the suspension.

FIG. 7 is a diagram showing an appearance of a conventional magneto-optical recording head device.

FIG. 8 is a side view of the conventional magneto-optical recording head device.

FIG. 9 is a diagram for explaining a magnetic field application area by a magnetic head constituting the magneto-optical recording head device.

[Explanation of symbols]

Reference Signs List 1 magneto-optical disk, 2 suspension, 3 slider, 4 magnetic head, 5 optical head, 6 support mechanism, 7 objective lens

Claims (12)

[Claims] 1. An optical head having an objective lens and a magneto-optical recording head device having a magnetic head, wherein a horizontal displacement of the magnetic head caused by a change in a thickness direction of the magneto-optical disk is mutually canceled. Magneto-optical recording, characterized in that a suspension composed of a leaf spring having at least two components having different thicknesses and / or materials different from each other is arranged so as to apply a constant load pressure to the magnetic head. Head device. 2. The magneto-optical recording head device according to claim 1, wherein the two components constituting the suspension have different thicknesses and / or materials for different spring constants. 3. The magneto-optical recording head device according to claim 1, wherein the suspension is formed by bending a single leaf spring having a different thickness at a boundary portion having a different thickness. 4. The magneto-optical recording head device according to claim 1, wherein the suspension is formed by joining two components having different thicknesses and / or materials. 5. The magneto-optical recording head according to claim 2, wherein the two components of the suspension have different lengths, and a spring constant of the shorter length is larger than a spring constant of the longer length. apparatus. 6. The magneto-optical recording head device according to claim 5, wherein each of the two components of the suspension is linear and non-linear as a whole. 7. The magneto-optical recording head device according to claim 6, wherein the two suspensions are arranged symmetrically to support the magnetic head in a double-ended state. 8. A magneto-optical recording head device comprising an optical head having an objective lens and a magnetic head, wherein a suspension for applying a constant load pressure to the magnetic head is a linearly movable elastic member. Magneto-optical recording head device. 9. A magneto-optical recording device comprising: a disk rotation drive mechanism for mounting and rotating a magneto-optical disk; and a magneto-optical recording head device having an optical head and a magnetic head, and recording an information signal on the magneto-optical disk. In the apparatus, the magneto-optical recording head device may be arranged such that a horizontal displacement amount of the magnetic head, which is generated with respect to a change in a thickness direction of the magneto-optical disk, is arranged so as to cancel each other out.
Alternatively, a constant load pressure is applied to the magnetic head by a suspension comprising a leaf spring having at least two components made of different materials. 10. A magneto-optical recording device comprising: a disk rotation drive mechanism for mounting and rotating a magneto-optical disk; and a magneto-optical recording head device having an optical head and a magnetic head, and recording an information signal on the magneto-optical disk. The magneto-optical recording device, wherein the suspension for applying a constant load pressure to the magnetic head is a linearly movable elastic member. 11. A magneto-optical recording apparatus for recording an information signal on a magneto-optical disk, wherein the magnetic head is disposed opposite to an optical head having an objective lens via the magneto-optical disk. A leaf spring having at least two components having different thicknesses and / or materials arranged in such a manner that the horizontal displacement of the magnetic head caused by a change in the thickness direction of the magneto-optical disk is canceled each other. A magnetic head support device, which is supported so that a constant load pressure is applied by a suspension. 12. A magneto-optical recording device for recording an information signal on a magneto-optical disk, wherein the magnetic head support device is disposed opposite to an optical head having an objective lens via the magneto-optical disk. A magnetic head supporting device, which is supported by a suspension made of a linearly movable elastic member so as to apply a constant load pressure.