JP3190134B2 - Suspension for sliding magnetic head and sliding magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding type magnetic head suspension and a sliding type magnetic head used for a drive device for a magneto-optical recording medium or a magnetic recording medium supported by the suspension.

[0002]

2. Description of the Related Art Optical discs have attracted attention as large-capacity information recording media. Among them, there is a magneto-optical disk of a magnetic field modulation type, and application to a data file or the like is expected. In the magnetic field modulation method, a laser beam is radiated from an optical head to a recording layer of a disc in a DC manner to raise the temperature, and at the same time, a modulated magnetic field is applied from a magnetic head arranged on the opposite side of the optical head. Recording is performed by applying the voltage to the recording layer. Therefore, this method allows overwrite recording.

The conventional magneto-optical disk drive mainly employs the CSS system. In the CSS method, a floating magnetic head is used, and the magnetic head contacts the disk surface at the start and end of driving.

Recently, a magneto-optical disk capable of recording / reproducing at the same linear velocity as a compact disk (CD) has attracted attention because a drive device can be shared with a CD simply by adding or changing an optical system. The linear velocity of the CD is 1.2-1.
Since the speed is as low as 4 m / s, the magnetic head cannot be levitated, and the CSS method as described above cannot be used. Therefore, it is conceivable to use a fixed magnetic head that is kept at a fixed distance from the disk surface.

However, since the magneto-optical disk is made of plastic such as polycarbonate and is removable, the surface runout is very large, about 50 to 500 μm. The magnetic head may collide with the disk due to vibration or vibration of the drive device. Further, in order to make the magnetic head follow the disk runout, it is necessary to provide a servo means, which complicates the configuration of the drive device.

[0006] Under such circumstances, it has been considered that the magnetic head always slides on the disk surface as in the case of the floppy disk drive.

A magnetic head of a floppy disk drive is, for example, disclosed in Japanese Patent Application Laid-Open No. 62-287488.
2. Description of the Related Art There is known a gimbal plate formed by cutting a pair of opposed U-shapes so as to follow a displacement of a magnetic disk in two directions.

[0008]

Problems to be Solved by the Invention
According to the gimbal plate disclosed in Japanese Patent No. 7488, it is possible to follow the surface runout of the magnetic disk in two directions well, but it can absorb only a small surface runout. It was unable to follow the runout on the order of several 100 μm, and development of a new suspension or the like was desired.

Incidentally, the spring load in the conventional drive device of the floating magnetic head is 5 to 10 gf, and the spring load in the floppy disk drive device is about 10 to 20 gf. A protective film for a magneto-optical disk having a frictional resistance higher than the surface has a problem that it is easily damaged and a problem that the load on the disk drive motor increases.

[0010]

This and other objects are achieved by the present invention which is defined below as (1) to (11) . (1) A bifurcated portion having a long plate shape as a whole and attached to a support, having two suspension arms extending substantially in parallel from the base for a predetermined length, and the two suspensions of the bifurcated portion Inwardly from the inner edge of each of the arms, there are provided two suspension parts extending in a direction substantially perpendicular to the suspension arm, so that the slider of the sliding magnetic head is mounted so as to extend between the two suspension parts. Wherein the spring load of the suspension is set to 3 gf or less. (2) The thickness of the suspension is 20 μm to 50 μm
m, the sliding magnetic head suspension according to (1) above. (3) a substantially rigid support arm, and a suspension having a base attached to the support arm, the suspension having a long plate shape as a whole, and a base attached to the support; A bifurcated portion having two suspension arms extending substantially parallel from a base, and two suspensions extending inwardly from respective inner edges of the two suspension arms of the bifurcated portion in a direction substantially orthogonal to the suspension arms; And a slider that is in sliding contact with a recording medium is attached so as to extend between the two suspension parts, and the suspension has a spring load of 3 g.
f. The sliding magnetic head is set to f or less. (4) The sliding magnetic head according to (3), wherein a suspension arm of the suspension is arranged to extend in parallel with the sliding direction of the recording medium. (5) The thickness of the suspension is 20 μm to 50 μm
m. The sliding magnetic head according to (3) or (4) above. (6) The slider has at least two sliding surfaces each formed of a curved surface on a surface facing the recording medium, a head core for applying a magnetic field in the slider, and the magnetic field generating portion of the head core is The sliding magnetic head according to any one of the above (3) to (5), located between the sliding surfaces. (7) The sliding magnetic head according to (6), wherein at least one sliding surface has a part of a spherical surface. (8) The sliding magnetic head according to the above (6) or (7), wherein a part of the peripheral surface of the cylinder exists on at least one sliding surface. (9) The sliding magnetic device according to any one of (6) to (8), wherein the number of the sliding surfaces is two, and the two sliding surfaces are arranged on both sides of a line connecting the suspension parts. head. (10) The above (3), wherein the slider is made of resin.
Or the sliding magnetic head of any one of (9). (11) The sliding magnetic head according to any one of (3) to (10), wherein the recording medium is a magneto-optical recording medium.

[0011]

[0012]

[0013]

[0014]

[0015]

[0016]

[0017]

[0018]

[0019]

[0020]

[0021]

[0022]

[0023]

[0024]

In the suspension of the present invention, a large surface deflection is absorbed by a suspension arm of a predetermined length, and the inclination of the magnetic head around the axis in the disk running direction is absorbed by the torsion of the suspension arm. The tilt around the axis perpendicular to the disk running direction axis of the head can be absorbed by twisting the suspension parts, and even if there are various surface runouts and tilts, the magnetic head can completely follow these, and it is stable Recording and reproduction can be performed.

In Japanese Patent Publication No. 57-54871, the spring, that is, the suspension of the floating magnetic head, is supported by the same two suspension arms and two suspension parts as in the present invention. Is disclosed. However, in what is disclosed in this publication,
In addition to the above-mentioned two suspension arms, a third suspension arm extending between them and having a tip connected to the magnetic head is provided. In this structure, the movement of the magnetic head is inevitably restricted by the central suspension arm, and follows the inclination around the longitudinal axis of the suspension arm well, but is perpendicular to the longitudinal axis. There is a problem that it is not possible to properly follow the inclination around the axis in the direction of the movement. In particular, there is a problem that it cannot follow the surface runout in the order of several hundred μm as in a magneto-optical disk.

[0026]

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

FIGS. 1 and 2 are a plan view and a front view, respectively, of a suspension for a sliding magnetic head according to an embodiment of the present invention.

In the drawings, reference numeral 1 denotes a suspension, and the suspension 1 is formed of an elastic metal material, for example, stainless steel, and has a long plate shape as a whole. The suspension 1 includes a base 2 attached to a support, which will be described later, and two suspension arms 3 and 4 extending a predetermined length substantially in parallel from the base 2.
And two suspension parts 6 extending inward from the respective inner edges of the two suspension arms 3, 4 of the forked part 5 in a direction substantially orthogonal to the suspension arms 3, 4. , 7 are provided. The slider 11 of the sliding magnetic head 10 is mounted so as to extend between the two suspension parts.

It is desirable that the spring load of the suspension 1 be set to 3 gf or less and 0.1 gf or more. Therefore, the thickness of the suspension 1 is usually 20 μm.
m to 50 μm. In particular, it is desirable to set it to 1 gf or less. If the spring load exceeds 3 gf, the surface of the recording medium will be more damaged, and if it is less than 0.1 gf, it will not be possible to follow a large surface runout.

Here, the sliding type magnetic head will be described. The present magnetic head is a magnetic head having a structure in which a slider slides on the surface of a recording medium at least during recording.
The slider has at least two sliding surfaces formed of curved surfaces on the recording medium facing surface, and has a magnetic field applying core in the slider. The magnetic field generating section of the magnetic field applying core is configured to be located between the sliding surfaces.

Examples of the recording medium to be combined with the magnetic head of the present invention include a magneto-optical recording medium and a magnetic recording medium. Specifically, the magnetic head of the present invention is a magneto-optical disk drive or a floppy disk drive. Applied to devices and the like. Among them, a case where the present invention is applied to a magneto-optical disk drive will be described.

FIG. 3 shows a preferred embodiment in which the sliding magnetic head of the present invention is applied to a magneto-optical disk drive. The magnetic head 10 shown in FIG.
And a magnetic field generating portion 13 of a head core and a winding 14 thereof.

On the recording medium facing surface of the slider body, sliding surfaces 21 and 22 are provided. Each of the sliding surfaces 21 and 22 has a part of a spherical surface and makes a point contact with the surface of the recording medium. Further, even when the slider body is inclined due to dust or the like on the surface of the recording medium, point contact is made, so that there is almost no change in sliding resistance. Also, when seeking on a disk-shaped recording medium, the sliding resistance in the seek direction is small.
Further, since the magnetic field generating unit 13 is disposed almost in the middle between the sliding surfaces 21 and 22, even if one of the sliding surfaces rises from the surface of the recording medium due to dust or the like, the floating amount of the magnetic field generating unit is raised. Suffices to be approximately half of the floating amount of the sliding surface.

The direction of relative movement of the slider with respect to the recording medium is not particularly limited, but is generally preferably the longitudinal direction of the slider body 2, that is, the direction connecting the sliding surfaces 21 and 22 or a direction perpendicular thereto. In particular, in order to increase the recording area in a disk-shaped recording medium, it is preferable that the relative movement direction of the slider substantially coincides with the direction connecting the two sliding surfaces.

In the present invention, the number of sliding surfaces is not limited to two,
Three or more may be provided. Further, the shape of the sliding surface may be a curved surface, and is not limited to a mode in which a part of a spherical surface exists as shown in FIG.

In the embodiment shown in FIG.
The recording medium facing surface is provided with three sliding surfaces 23, 24, and 25, and the other configuration is the same as the configuration shown in FIG. Each sliding surface has a part of the spherical surface as in FIG. The sliding surface 24 and the sliding surface 25 are arranged symmetrically with respect to the longitudinal direction of the slider 11.

In this embodiment as well, the direction of movement of the slider relative to the recording medium is not particularly limited, but it is preferable that the direction of movement of the slider substantially coincides with the longitudinal direction of the slider 11 in order to reduce the torsional moment of the slider during sliding. .

When four sliding surfaces are provided, a pair of sliding surfaces similar to the sliding surfaces 24 and 25 may be provided instead of the sliding surface 23, for example.

In the embodiment shown in FIG. 5, sliding surfaces 26 and 27 are provided on the surface of the slider body 11 facing the recording medium, and each sliding surface has a part of the peripheral surface of the cylinder. When the cylindrical portion is provided on the sliding surface as described above, the sliding resistance is reduced, so that the relative movement direction of the slider with respect to the recording medium substantially matches the axial direction of the cylindrical portion of the sliding surface. Is preferred. In the illustrated example, since the axial direction of the cylindrical portion coincides with the longitudinal direction of the slider body, it is preferable that the relative movement direction of the slider with respect to the recording medium is also the longitudinal direction of the slider body.

The present invention also includes a magnetic head having both a sliding surface on which a part of a spherical surface exists and a sliding surface on which a part of a peripheral surface of a cylinder exists. Further, the present invention includes a case in which the sliding surface has a curved surface whose curvature continuously changes.

In the present invention, the magnetic field generating portion of the head core is located between a plurality of sliding surfaces. In particular, the magnetic field generating portion may be located near the center of gravity of a straight line or a polygon connecting the centers of the sliding surfaces. preferable. The magnetic head of the present invention is pressed by a predetermined load and slides on the surface of the recording medium. In this case, it is preferable that the center of the load is also near the center of gravity.

In each of the above embodiments, the lower edge of the slider 11, that is, the ridge at the boundary between the recording medium facing surface and the side surface is preferably a curved surface. Further, it is preferable that this curved surface is smoothly continuous with the curved surface constituting the sliding surface. With this configuration, when the magnetic head is loaded and unloaded on the recording medium, and when seeking in the disk-shaped recording medium, even if the ridge contacts the recording medium, the ridge has a curved surface, Further, the recording medium is not damaged by being smoothly connected to the curved surface constituting the sliding surface.

The radius of curvature of the curved surface constituting the sliding surface is not particularly limited, and may be appropriately determined according to the amount of protrusion of the slider main body from the surface facing the recording medium and the dimensions of the slider main body. It may be appropriately selected from about 20 mm, but it is preferable to make the radius of curvature relatively large in order to reduce the impact when colliding with dust or projections on the surface of the recording medium.

The amount of protrusion of the sliding surface of the head core from the magnetic field generating section 13 may be appropriately determined according to various required conditions. For example, the interval between the recording medium and the magnetic field generating unit 13 is determined according to the required applied magnetic field strength and the performance of the head. Specifically, it may be appropriately determined according to the specification of the magneto-optical recording medium, the capability of the head core, and the like.
It is about 0 μm.

The magnetic field generator 13 may protrude from the surface of the slider body facing the recording medium, or may be inside the slider body. When the magnetic field generating unit 13 is provided in the slider main body, the magnetic field generating unit 1 is made of a material for the slider main body such as resin.
3 may be covered. In this case, it is preferable that the amount of protrusion of the sliding surface of the slider from the surface facing the recording medium is 50 μm or more.

The dimensions of the slider body may be determined as appropriate in accordance with the standard of the recording medium to be combined, for example, the window dimensions of the disk cartridge. -10mm, width 2-5mm
About 1 to 3 mm in height.

The sliding surface is preferably smooth, and specifically, Rmax is preferably 2 μm or less.

The slider is made of a non-magnetic material. The material and the manufacturing method of the slider main body are not particularly limited, but it is preferable to manufacture the slider body by injection molding using a resin because it can be formed into an arbitrary shape. The resin to be used is not particularly limited. However, since sliding friction can be reduced, polyarylate, polyacetal, Teflon, PEEK,
It is preferable to use nylon or the like.

The illustrated magnetic head is used for applying a magnetic field to a magneto-optical recording medium. In the illustrated example, the head core 1
Reference numeral 3 denotes an E-shaped core composed of three legs and a back core, and the central leg is exposed to the recording medium facing surface. The shape of the head core 13 is not limited to the E-shape. Other shapes such as a pot-shaped core having a structure in which a main magnetic pole and a cylindrical sub-magnetic pole are connected via a back core, and a U-shaped core having a single sub-magnetic pole may be used. It may be shaped.

The above-described magnetic head can be applied to both a magnetic field modulation type magneto-optical recording medium and a light modulation type magneto-optical recording medium.

When the above magnetic head is applied to a floppy disk drive, the head core in the illustrated example may be replaced with a normal head core for a floppy disk drive.

The above magnetic head can be used for a hard type magnetic disk, but in this case also, it is used as a constant contact type magnetic head.

Next, a support structure for supporting the magnetic head 10 with the suspension 1 will be described with reference to FIGS.

In the drawing, reference numeral 30 denotes a support arm for mounting the suspension 1 and has a thickness of 0.5 m.
It is formed of a substantially rigid plate-like member of the order of m.
The support arm 30 has a substantially crushed U-shape, and the base 2 of the suspension 1 is spot-welded to one vertical portion 31 of the U-shape by a laser or the like.

The suspension 1 has a tongue-shaped slider mounting portion 34 which is connected to the two suspension parts 6 and 7. Slider mounting part 34
Has a cutout at the approximate center. By fixing the slider to the suspension with the head core abutting against the sides 34a and 34b formed by the notches,
The head core is accurately positioned with respect to the suspension. The slider 11 has sliding surfaces 21 and 22 when the slider body is as shown in FIG. 3, 23, 24 and 25 when it is as shown in FIG. 4, and sliding surfaces when it is as shown in FIG. It is desirable that 26 and 27 are arranged on both sides of a line connecting both suspension parts 6 and 7. With this arrangement, the torsion of the suspension part for following the inclination of the recording medium can be reduced, and the following can be easily performed.

In the suspension 1, it is preferable that a horizontal member 8 is provided at a free end thereof, and a guide member 9 extending upward therefrom is provided. Although not shown, the guide member 9 has a guide groove formed at the center in the longitudinal direction along the length thereof. The guide groove has a U-shaped free end of the support arm 30. End vertical section 32
And guides the movement of the tip of the suspension 1 such as vertical movement following a change in the surface of the recording medium of the magnetic head 10 supported by the suspension 1. .

FIG. 7 shows an imaginary line in which the magnetic head 10 is in contact with the surface F of the magnetic recording medium M.

The suspension 1 supporting the magnetic head 10 is arranged so that the length direction of the suspension is along the sliding direction with the recording medium.

In the above-described embodiment, the suspension parts are formed at the intermediate portion of the suspension arm. However, the suspension parts may be formed at the tip of the suspension arm.

The suspension and the sliding magnetic head supporting structure having the above-described structures have a predetermined length,
A suspension arm having a spring load of 3 gf smaller than that of a conventional suspension or a gimbal can follow a large fluctuation such as a runout of a magnetic disk such as a magneto-optical disk. While the suspension parts can effectively absorb fluctuations such as small inclinations around the longitudinal axis, the suspension parts can effectively absorb fluctuations such as small inclinations around a horizontal axis orthogonal to the longitudinal axis. Therefore, the contact state of the magnetic head with the magnetic medium becomes stable, so that recording and reproduction can be performed with high accuracy.

[Brief description of the drawings]

FIG. 1 is a plan view showing a suspension for a sliding magnetic head according to an embodiment of the present invention.

FIG. 2 is a front view of the suspension.

FIG. 3 is a perspective view showing an example of a sliding magnetic head supported by the suspension.

FIG. 4 is a perspective view showing another example of the sliding magnetic head.

FIG. 5 is a perspective view showing still another example of the sliding magnetic head.

FIG. 6 is a plan view showing a support structure of a sliding magnetic head using the suspension.

FIG. 7 is a front view of the support structure.

DESCRIPTION OF SYMBOLS 1 Suspension 2 Base 3, 4 Suspension arm 5 Bifurcated part 6, 7 Suspension parts 10 Magnetic head 11 Slider 21, 22, 23, 24, 25, 26, 27 Sliding surface 13 Magnetic field generator 14 turns Wire 30 support arm

Continuation of the front page (56) References JP-A-49-118408 (JP, A) JP-A-49-79518 (JP, A) JP-A-4-114376 (JP, A) JP-A-4-162231 (JP) , A) Actually open sho 56-127958 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 21/21 G11B 5/60 G11B 11/105

Claims (11)

(57) [Claims] 1. A bifurcated part having a base part attached to a support, and having two suspension arms extending substantially parallel to the base part by a predetermined length, the base part being a long plate as a whole.
And two suspension parts extending inward from the respective inner edges of the two suspension arms of the bifurcated portion in a direction substantially orthogonal to the suspension arms, wherein the slider of the sliding magnetic head comprises the two suspension parts. The suspension is mounted so as to extend between the parts, and the spring load of the suspension is set to 3 gf or less.
A suspension for a sliding magnetic head. 2. A sliding type magnetic head suspension according to claim 1 a thickness of the suspension is 50μm to no 20 [mu] m. 3. A substantially rigid support arm, and a suspension having a base attached to the support arm, the suspension having a generally elongated plate shape, and a base attached to the support. A bifurcated portion having two suspension arms extending substantially parallel from the base, and extending inwardly from respective inner edges of the two suspension arms of the bifurcated portion in a direction substantially orthogonal to the suspension arms. A slider that is in sliding contact with the recording medium is mounted so as to extend between the two suspension parts, and a spring load of the suspension is set to 3 gf or less.
Sliding type magnetic head, characterized by that. 4. The sliding magnetic head according to claim 3 , wherein a suspension arm of the suspension is arranged so as to extend in parallel with a sliding direction of the recording medium. 5. The sliding magnetic head according to claim 3 , wherein the suspension has a thickness of 20 μm to 50 μm. 6. The slider has at least two sliding surfaces each having a curved surface on a surface facing the recording medium, a head core for applying a magnetic field in the slider, and a magnetic field generating section of the head core. 6. A sliding magnetic head according to claim 3 , wherein said magnetic head is located between said sliding surfaces. 7. The sliding magnetic head according to claim 6 , wherein at least one sliding surface has a part of a spherical surface. 8. The sliding magnetic head according to claim 6, wherein at least one sliding surface has a part of the peripheral surface of the cylinder. 9. The sliding magnetic head according to claim 6, wherein said two sliding surfaces are arranged on both sides of a line connecting the suspension parts. . 10. A sliding magnetic head according to claim 3, wherein said slider is made of resin. 11. A sliding magnetic head according to claim 3 , wherein said recording medium is a magneto-optical recording medium.