JPH04252480A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To prevent the phenomenon that the magnetic head integrated board comes into contact with and slides recording surface in the magnetic disk unevenly and the recording/reproduction operations becomes unstable when the recording/reproduction are performed in a condition that the magnetic integrated board that many planar thin film magnetic heads are provided flatly comes into contact with and slides the said recording surface in the magnetic disk. CONSTITUTION:The device is composed so that the both surfaces magnetic head integrated board 26 can contact with and slides the recording surface in each magnetic disk 23 with even pressure by arranging the plural magnetic disk 23 installed so that they can move only along the shaft direction of a rotation spindle 22, and a bothside magnetic head integrated board 26 that the rear parts each other of two magnetic head integrated boards 26a, 26b provided with many planar type thin film magnetic head flatly on one side are inserted, attached and integrated between the magnetic disk 23 via flexible elastic sheet.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device used as an external storage device for a computer system, and more particularly to a magnetic disk device of the head contact sliding type that enables stable high-density recording. In magnetic disk drives, as the recording density increases, the gap between the head and the disk, that is, the flying gap of the magnetic head slider that flies relative to the magnetic disk surface, is miniaturized.
It is essential to stabilize the flying posture in this low flying state.

In particular, the flying height of the magnetic head slider is
If the diameter is less than 0.1 μm, the probability that the flying magnetic head slider will contact and collide with the magnetic disk surface increases, making it easy to damage or break the magnetic disk surface and magnetic head. Apply lubricant,
Alternatively, it is common practice to coat the magnetic disk with a lubricating film to prevent damage or breakage of the magnetic disk.

However, as mentioned above, the lubricant or lubricant film applied to the surface of the magnetic disk acts like an adhesive that causes the head to stick. Contact
In the SartStop) operation method, when the magnetic disk starts rotating or stops rotating, the magnetic head slider repeatedly sticks and slips, resulting in a head crash or a contact slide. During head movement or head seek, lubricant on the magnetic disk surface accumulates on the magnetic head slider surface, and this deposit falls onto the magnetic disk surface, disturbing the flying posture of the magnetic head slider and colliding with the magnetic disk surface. ,
There was a problem with damage. Therefore, there is a need for an apparatus configuration that can stably record and reproduce information without causing the magnetic head slider to crash due to high-density recording.

0004

BACKGROUND OF THE INVENTION In order to eliminate the above-mentioned problems, a magnetic head stacking plate in which a large number of planar thin film magnetic heads are disposed in a plane facing the surface of a magnetic disk is coated with a lubricant or The so-called so-called recording and reproducing method in which information is recorded and reproduced by each predetermined planar type thin film magnetic head on the magnetic head stacking plate with a rotating magnetic disk sliding on the magnetic head stacking plate, which are arranged one on top of the other with a lubricating film interposed therebetween. , has already proposed a contact recording type magnetic disk device in Japanese Patent Application No. 2-217816.

That is, the magnetic disk device proposed above is shown in FIG.
As shown in the schematic side sectional view, for example, the number of recording tracks corresponding to each of the front and back surfaces of a plurality of magnetic disks 3 mounted on the rotating spindle 2 is the same as the number of recording tracks on each magnetic disk surface. As shown in Figure 10, Al2O
3. On a non-magnetic substrate 11 made of TiC or the like, a pair of magnetic head integrated plates 4a and 4b on which a planar thin film magnetic head 12 is arranged in a planar pattern as shown by a chain line are placed one on top of the other so as to sandwich them. A plurality of locations around it are fixed to the inner wall or the like of the airtight container 1 of the device by fixing members 5.

[0006] Then, with liquid lubricant being supplied between each of the magnetic disks 3 and the pair of magnetic head accumulation plates 4a and 4b by a small supply circulation pump 6, etc., the pair of magnetic head stacking plates 4a, 4b is supplied to each of the rotating magnetic disks 3. magnetic head integrated plate 4a,
By recording and reproducing information using the planar thin film magnetic heads 12 of the pair of magnetic head integrated plates 4a and 4b corresponding to a predetermined recording track without seeking the head 4b, head adsorption and crashes are prevented. That's what I do.

[0007]

However, in the magnetic disk device proposed above, when attaching the pair of magnetic head stacking plates 4a and 4b to the front and back surfaces of the corresponding magnetic disks 3 so as to sandwich them one on top of the other, It is necessary to bring the magnetic head stacking plates 4a and 4b into contact with the front and back surfaces of the magnetic disk 3 with equal pressure and to adjust them so that they slide, but it takes a long time to control the adjustment. In addition, there was a problem in that accurate attachment was difficult.

For this reason, the magnetic head stacking plates 4a and 4b tend to slide in contact with the front and back surfaces of the magnetic disk 3 non-uniformly, causing uneven wear on both of them, and preventing information from being recorded. - There was a problem with unstable playback. In view of the above-mentioned conventional problems, the present invention provides a novel contact recording type magnetic disk device in which a magnetic head stacking plate can be easily assembled so as to contact and slide on the recording surface of a magnetic disk with uniform pressure. The purpose is to

[0009]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention includes a rotating spindle, a plurality of magnetic disks mounted on the rotating spindle so as to be movable only along the axial direction thereof, and each magnetic disk. The magnetic head stacking plate is arranged between the disks and has a large number of planar thin film magnetic heads on both sides thereof.

Further, the magnetic head integrated plate has two planar type thin film magnetic heads disposed on the surface thereof.
The back surfaces of two magnetic head integrated plates are integrally bonded together via a flexible elastic member. Further, at least one guide fitting protrusion or guide fitting groove is provided on the outer periphery of the rotating spindle along its length, and at least one guide fitting protrusion or guide fitting groove of the rotating spindle is provided on the inner periphery of the magnetic disk. Fits with the mating protrusion or the guide mating groove,
In addition, the structure includes a guide fitting groove or a guide fitting protrusion that is movable only along the axial direction.

Furthermore, at least one guide hole is provided in the inner peripheral portion of the magnetic disk, and a locking pin is provided for insertion and locking into the guide hole of the magnetic disk along the axial direction of the rotating spindle. The configuration is as follows. Furthermore, the magnetic disk is inserted into a rotating spindle via a slide bearing that is movable only in the axial direction.

0012

[Operation] In the magnetic disk drive of the present invention, for example, for a rotating spindle provided with at least one guide fitting protrusion or guide fitting groove along the length direction of the outer circumference, the inner circumference is provided with at least one guide fitting protrusion or guide fitting groove. Fitting protrusion for guiding the rotating spindle;
Or, a guide fitting groove that fits into the guide fitting groove and is movable only along the axial direction, or a magnetic disk provided with a guide fitting protrusion, or along the axial direction of the rotating spindle. Insert into the guide hole of the magnetic disk,
and a magnetic disk that is vertically movable and has at least one guide hole in its inner periphery, or a magnetic disk that is vertically movable with respect to a rotating spindle that is equipped with a locking pin that locks the rotation. A large number of planar thin-film magnetic heads are disposed on the surface of the magnetic disk via a slide bearing, and facing the recording surface of the magnetic disk, each corresponding to a recording track on the surface of the magnetic disk, for example. The back surfaces of two magnetic head stacking plates are bonded to each other via a flexible elastic member, and integral double-sided magnetic head stacking plates are stacked alternately, and the top and bottom magnetic disk surfaces are stacked one on top of the other. In this case, a single-sided magnetic head stacking plate in which a large number of planar thin-film magnetic heads are arranged in a plane on one side is fixedly arranged with a predetermined pressure applied to each by a support member bonded via a flexible elastic member. By doing so, it becomes possible to easily assemble the double-sided magnetic head stacking plates so that they come into contact with and slide against the recording surface of each magnetic disk with an even predetermined pressing force.

As a result, uneven contact and wear of the double-sided magnetic head stack facing the recording surface of the magnetic disk are prevented, stable high-density recording and reproduction of information can be realized, and reliability is improved.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic side sectional view showing an embodiment of a magnetic disk device according to the present invention, and FIG. 2 is a plan view for explaining an embodiment of a configuration for inserting a magnetic disk into a rotating spindle of the present invention.

In FIG. 1, reference numeral 22 denotes a rotating spindle provided with at least one guide fitting protrusion 22a along the length direction of the outer periphery; in this embodiment, three guide fitting protrusions 22a are provided. As shown in FIG. 2, the rotating spindle 22 is provided with a guide fitting that fits into the three guide fitting protrusions 22a of the rotating spindle 22 and is movable only in the axial direction. As shown in FIG. 3, a plurality of magnetic disks 23 on which matching grooves 23a are formed, and planar thin film magnetic heads 24 of the same number as the number of recording tracks on the front and back surfaces of each magnetic disk 23 are arranged flatly on both the front and back surfaces. As shown in FIG. 4, a plurality of double-sided magnetic head stacking plates 26, which are disposed and have larger inner and outer diameters than the magnetic disks 23, are locked by locking members 22b and alternately in contact with each other. They are inserted overlapping each other.

Each of the double-sided magnetic head stacking plates 26 is fixed to the inner wall of the airtight container 21 of the apparatus by fixing members 27 at a plurality of places around it to prevent it from rotating or shifting in position. Each magnetic disk 2 at the bottom
3. A single-sided magnetic head integrated plate 2 with a large number of planar thin-film magnetic heads 24 arranged on one side in the same way on both the front and back sides.
8 are in contact with each other, and are fixedly arranged in a state where a predetermined pressure is applied to each by a support member 29.

Note that the magnetic disk 23 has, for example, 5
．． Ni-P on the surface of a 25-inch diameter aluminum substrate
A C film was formed on a disk substrate by electroless plating.
A magnetic recording film made of o-Cr or the like is deposited by sputtering, and a solid lubricant film made of molybdenum disulfide or the like is further applied to the surface thereof. As shown in FIG. 3, the double-sided magnetic head integrated plate 26 is mounted on a non-magnetic substrate 30 made of, for example, Al2O3.TiC.
The number of planar thin film magnetic heads 24 is the same as the number of recording tracks on the surface of the magnetic disk 23, that is, 3 planar thin film magnetic heads 24 at a density of 2000 tracks/inch correspond to each recording track.
000 planar type thin film magnetic heads 24 are divided into 32 groups radially from the center as shown by chain lines, and about 40
Two single-sided magnetic head stacking plates 26a and 26b formed in a plane with a pitch of 0 μm are bonded together at their back surfaces with a flexible elastic sheet 25 made of cellular urethane foam or the like sandwiched therebetween, as shown in FIG. It is constructed in one piece. A solid lubricant film made of molybdenum disulfide or the like is also applied to the medium facing surface of the double-sided magnetic head integrated plate 26, if necessary.

Furthermore, a single-sided magnetic head stacking plate 28 is also provided, which is pressed against the front and back surfaces of the uppermost and lowermost magnetic disks 23 of the plurality of magnetic disks 23.
Similar to the two single-sided magnetic head integration plates 26a and 26b, the same number of planar thin film magnetic heads 24 as the number of recording tracks on the front and back surfaces of the magnetic disk 23 are disposed on one side, and the single-sided magnetic head integration plates 26a and 26b are arranged on one side. Each of the plates 28 is a flexible elastic sheet 25 made of the above-mentioned cellular urethane foam or the like.
The support member 29 is integrally bonded to the support member 29 with the support member 29 sandwiched therebetween.

In such an apparatus configuration, a plurality of double-sided magnetic head stacking plates 26, which are integrally constructed by bonding and bonding a flexible elastic sheet 25 between them, are inserted into the rotating spindle 22 and are alternately stacked on top of each other. The magnetic disks 23 rotate as the rotating spindle rotates, and are movable vertically along the rotating spindle 22, so that the magnetic disks 23 are in contact with each recording surface of the plurality of magnetic disks 23. The double-sided magnetic head stacking plate 26 and the single-sided magnetic head stacking plate 28 arranged in this condition always slide into contact with a uniform predetermined pressure due to the elastic action of the flexible elastic sheet 25 made of the above-mentioned cellular urethane foam or the like interposed therebetween. This makes it possible to move the magnetic disks 23 and the double-sided magnetic head stacking board 26 easily.

Therefore, the double-sided magnetic head stacking plate 26 and the single-sided magnetic head stacking plate 28, which are placed in contact with the recording surface of each magnetic disk 23, do not come into uneven contact or wear out, and can maintain uniform contact. The planar thin film magnets corresponding to the double-sided magnetic head stacking plate 26 and the single-sided magnetic head stacking plate 28 are capable of maintaining a sliding state and are arranged in contact with predetermined recording tracks of each rotating magnetic disk 23. The head 24 can realize stable information recording and reproduction.

[0021] In the above embodiment, the rotating spindle 2
Three guide fitting protrusions 22a are provided along the length direction on the outer circumference of the magnetic disk 23, and three guide fitting protrusions 22a are provided on the inner circumference of the magnetic disk 23.
Although an example has been described in which a guide fitting groove 23a is provided which fits into the guide fitting groove 23a and is movable only along the axial direction, the present invention is not limited to this example.
For example, at least one guide fitting groove is provided on the outer circumference of the spindle 22 along its length, and the guide fitting groove of the rotating spindle 22 is fitted into the inner circumference of the magnetic disk 23, and A guide fitting protrusion that is movable only in the axial direction may be provided.

Furthermore, in the above embodiments, the inner and outer diameters of the double-sided magnetic head stacking plate 26 and the single-sided magnetic head stacking plate 28 are made larger than those of the opposing magnetic disk 23, because the surface of the magnetic disk 23 is covered. This is to make it difficult for the attached solid lubricant to scatter from the sliding surfaces of the magnetic disk 23 and the double-sided magnetic head stacking plate 26 and the single-sided magnetic head stacking plate 28. Furthermore, the planar thin film magnetic heads 24 in each group on the double-sided magnetic head stacking plate 26 and the single-sided magnetic head stacking plate 28 are arranged in a straight line in the radial direction as shown by the chain lines in FIG. The arrangement is not limited to this example, and may be arranged in an arbitrary manner, such as in a diagonal line in the radial direction or in a circular arc.

FIG. 5 is a partially enlarged sectional view showing another embodiment of the structure for inserting a magnetic disk into a rotating spindle according to the present invention, and FIG. 6 is a plan view showing the magnetic disk of FIG. 5, and FIG. 2 and FIG. The same parts are given the same symbols. The embodiment shown in these two figures differs from the example shown in FIGS. 2 and 4 in that at least one guide fitting protrusion is provided along the length of the outer circumference of the rotary spindle 22, for example, in this embodiment three A book guide fitting protrusion 22a (or a guide fitting groove) is provided, and the guide fitting protrusion 22a of the rotary spindle 22 is provided on the inner circumference of the magnetic disk 31.
(or guide fitting groove) and is movable only along the axial direction of the rotating spindle.
2a (or guide fitting protrusion) is attached to the rotating spindle 22.
Insert the magnetic disk 31 with the flange 32 and the double-sided magnetic head stacking plate 26 into contact with each other alternately and lock them with the locking member 22b,
Each of the double-sided magnetic head stacking plates 26 is fixed at multiple points around it to the inner wall of the airtight container 21 of the device using fixing members 27 so as not to rotate or shift its position.
Also, by bringing the single-sided magnetic head stacking plate 28 into contact with the front and back surfaces of each of the uppermost and lowermost magnetic disks 31 and fixing them in a state where a predetermined pressure is applied to each by the support member 29 via the elastic sheet 25, The same effects as the embodiments shown in FIGS. 2 and 4 can be obtained.

FIG. 7 is a partially enlarged sectional view showing still another embodiment of the configuration for inserting a magnetic disk into a rotating spindle of the present invention, and FIG. 8 is a plan view showing the magnetic disk of FIG. 7, and FIG. Parts equivalent to 4 are given the same reference numerals. The difference between the embodiment shown in these two figures and the example shown in FIGS. 2 and 4 is that at least one guide insertion hole 41a is provided in the inner circumference of each magnetic disk 41, and the magnetic disk 41 is mounted on a rotating spindle. 42, are alternately stacked in contact with the double-sided magnetic head stacking plate 26, and are locked by the locking member 42a.
Each magnetic disk 41 is rotated as the rotary spindle 42 rotates by inserting a guide insertion hole 41a provided in the magnetic disk 41 into a locking pin 43 attached along the length direction of the rotary spindle 42. , and is movable along the axial direction of the rotating spindle 42.

Each double-sided magnetic head stacking plate 26 is fixed to the inner wall of the airtight container 21 of the apparatus using fixing members 27 at a plurality of places around it so as not to rotate or shift its position. each magnetic disk 41
The embodiments shown in FIGS. 2 and 4 can also be achieved by bringing the single-sided magnetic head stacking plate 28 into contact with both the front and back surfaces, and by fixing them with a predetermined pressure applied to each by the support member 29 via the elastic sheet 25. A similar effect can be obtained.

Furthermore, as another example, each magnetic disk 4
A slide bearing that can move only along the axial direction of the rotary spindle 42 is provided on the inner circumference of the double-sided magnetic head stacking plate 2 , and the magnetic disk 41 is mounted on the rotary spindle 42
The same effects as in the embodiments shown in FIGS. 2 and 4 can also be obtained by alternately inserting and overlapping each other in a state in which they are in contact with each other.

In the above embodiments, a solid lubricant film made of molybdenum disulfide or the like is applied to the surface of each magnetic disk and, if necessary, to the front and back surfaces of each double-sided magnetic head stacking plate. Although described above, the present invention is not limited to this example. For example, a suitable amount of fluorocarbon-based liquid lubricant may be supplied between each magnetic disk and the double-sided magnetic head stacking plate.

[0028]

As is clear from the above description, the magnetic disk device according to the present invention has a magnetic disk that can move only along the axial direction of the rotating spindle and a flexible elastic disk. Double-sided magnetic head stacking plates, which are integrally constructed by sandwiching sheet materials and glued together, are alternately stacked and inserted, so that the double-sided magnetic head stacking plates are placed in contact with each recording surface of each magnetic disk. The magnetic head stacking plates can always be slid in contact with each other with a uniform predetermined pressure due to the elastic action of the flexible elastic sheet material interposed between them, and the work of combining each magnetic disk with the double-sided magnetic head stacking plate is easy. In addition, uneven contact and abrasion of the double-sided magnetic head stacking plate facing the recording surface of the magnetic disk are prevented, and a good contact sliding state can be maintained.

[0029] Therefore, stable high-density recording and reproduction without problems such as head crashes can be realized, and the reliability of the apparatus can be significantly improved, resulting in excellent practical effects.

[Brief explanation of the drawing]

FIG. 1 is a schematic side sectional view showing an embodiment of a magnetic disk device according to the present invention.

FIG. 2 is a plan view for explaining an embodiment of a configuration for inserting a magnetic disk into a rotating spindle of the present invention.

FIG. 3 is a plan view for explaining an embodiment of a double-sided magnetic head integrated plate according to the present invention.

FIG. 4 is a partially enlarged sectional view showing a combined structure of a magnetic disk and a double-sided magnetic head integrated plate according to the present invention.

FIG. 5 is a partially enlarged sectional view showing another combination configuration of a magnetic disk and a double-sided magnetic head integrated plate according to the present invention.

FIG. 6 is a plan view for explaining another embodiment of the configuration for inserting a magnetic disk into a rotating spindle according to the present invention.

FIG. 7 is a partially enlarged sectional view showing still another combination configuration of the magnetic disk and double-sided magnetic head integrated plate of the present invention.

FIG. 8 is a plan view for explaining still another embodiment of the configuration for inserting a magnetic disk into a rotating spindle according to the present invention.

FIG. 9 is a schematic side sectional view showing an example of a conventional magnetic disk device.

FIG. 10 is a plan view for explaining a conventional magnetic head integrated plate.

[Explanation of symbols]

21 Airtight storage container
22, 42 Rotating spindle 22a Guide fitting protrusion
22b, 42a Locking member 23, 31, 41 Magnetic disk
23a 32a Guide fitting groove 24 Planar thin film magnetic head 2
5 Elastic sheet 26 Double-sided magnetic head stacking board
26a, 26b, 28 single-sided magnetic head integrated plate

Claims (5)

[Claims] Claim 1: A rotating spindle (22), a plurality of magnetic disks (23) attached to the rotating spindle (22) so as to be movable only along the axial direction thereof, and a plurality of magnetic disks (23) between each magnetic disk (23). 1. A magnetic disk drive comprising: a magnetic head stacking plate (26) having a plurality of planar thin film magnetic heads (24) disposed on both sides thereof. 2. The double-sided magnetic head stacking plate (26) is composed of two magnetic head stacking plates (26a, 26) on which a large number of planar thin film magnetic heads (24) are arranged in a plane.
2. A magnetic disk drive according to claim 1, wherein the back surfaces of the parts (b) are integrally bonded together via a flexible elastic member (25). 3. At least one guide fitting protrusion (22a) or guide fitting groove is provided along the axial direction on the outer periphery of the rotating spindle (22), and the inner circumference of the magnetic disk (23) is The rotating spindle (
22), the guide fitting protrusion (22a), or the guide fitting groove (23a) that fits into the guide fitting groove and is movable only in the axial direction, or the guide fitting protrusion 3. A magnetic disk device according to claim 1 or 2, further comprising: a. 4. At least one guide insertion hole (41a) is provided in the inner circumference of the magnetic disk (41), and a guide hole (41a) for guiding the magnetic disk (41) is provided along the axial direction of the rotating spindle (42). 3. A magnetic disk drive according to claim 1, further comprising a locking pin (43) that is inserted through and locked into the insertion hole (41a). 5. The magnetic disk device according to claim 1, wherein the magnetic disk is inserted into a rotating spindle via a slide bearing that is movable only in the axial direction.