JPH04102283A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To stably perform recording with high recording density and reproduction by arranging a magnetic head integrated plate on which a large number of planer type thin film magnetic heads are arranged flatly and in radial shape so as to be laminated confronting with a recording plane. CONSTITUTION:A pair of plane magnetic head integrated plates 4a, 4b with minor and major diameters a little larger than that of a magnetic disk 3 are arranged so as to be sandwiched confronting with the surface and back planes of the disk 3, and plural parts in the neighborhood of the plates are fixed on the inner wall, etc., of the sealing container 1 of a device with a fixing member 5. The integrated plates 4a, 4b are formed in such a way that the same number of planer type thin film magnetic heads 12 as that of recording tracks on the plane of the disk 3 are formed and arranged on a nonmagnetic substrate 11. The integrated plates 4a, 4b are arranged in a state where they are slightly floated interposing liquid lubricant between the magnetic disk 3. As a result, it is possible to stably record and reproduce information on the prescribed recording track of the disk 3 with a corresponding thin film magnetic head 12.

Description

[Detailed Description of the Invention] [Summary] Regarding the configuration of a magnetic disk device that is capable of stable high-density recording, the present invention aims to eliminate occurrences of head crashes caused by head adsorption to the magnetic disk and lubricant accumulation, and to achieve stable high-density recording. Aimed at enabling high-density recording, a large number of planar thin-film magnetic heads are arranged in a plane and radially opposite the recording surface of a magnetic disk mounted on a rotating mechanism.・It has a structure in which seven stacking boards are arranged one on top of the other.

The magnetic head stacking plate is fixed to the magnetic disk and has a plurality of planar thin film magnetic heads corresponding to each recording trunk on the recording surface.

The magnetic head stacking plate is supported by a moving means that is movable in a direction perpendicular to the recording trunks of the magnetic disk, and has a planar thin-film magnetic head whose number is smaller than the number of recording trunks of the magnetic disk. .

Further, the moving means for the magnetic head stacking plate is composed of a piezoelectric element, and the piezoelectric elements are attached at a plurality of locations around the magnetic head stacking plate and between the inner wall of the container.

In addition, the size of the magnetic head accumulating plate is large enough to cover the entire recording surface of one side of the magnetic disk, and a liquid lubricant is continuously applied between the magnetic disk and the magnetic head accumulating plate, or The structure is equipped with a mechanism for intermittent supply.

Further, a solid lubricant is applied to one or both surfaces of the magnetic disk and the magnetic disk.

[Industrial application field]

The present invention relates to a magnetic disk device used as an external storage device for a computer system, etc., and particularly to the configuration of a magnetic disk device that is capable of stable high-density recording.

In magnetic disk drives, as recording density increases, the gap between the head and the disk, that is, the flying gap of the magnetic hent slider relative to the magnetic disk surface, tends to become smaller and smaller. As a result, the flying posture of the magnetic head slider becomes unstable, and in the worst case, hesodoclasia is more likely to occur. Therefore, even in such high-density recording, there is a need for an apparatus configuration that can stably record and reproduce information without causing head crashes.

[Conventional technology]

In conventional magnetic disk drives, the flying height of the magnetic head slider relative to the magnetic disk surface has become smaller and smaller as the recording density has increased, and the flying height of the magnetic head slider has decreased to 0.1.
When the temperature drops below μ, the probability that the magnetic head slider in the flying state will come into contact with the magnetic disk surface increases, making its flying posture unstable, and both the magnetic disk and the magnetic head slider become susceptible to wear or damage. . Therefore, in order to prevent such troubles, it has been proposed to coat the surface of the magnetic disk with a fluorocarbon lubricant or with a lubricant film, and this is generally practiced as a conventional method.

[Problem to be solved by the invention]

By the way, the lubricant or lubricant film applied to the surface of the magnetic disk in order to prevent the above-mentioned troubles acts like an adhesive that causes the head to stick. (Contact 5tar
In magnetic disk drives using the 5top) operating method, head crashes occur due to a phenomenon in which the magnetic hent slider, which contacts and attracts the magnetic disk when it is stopped, shifts from the attracted state to the sliding state when the magnetic disk starts rotating. This may occur and damage the magnetic disk surface, or such lubricant may adhere or accumulate on the slider surface during contact sliding or seeking, and the deposited lubricant may fall onto the disk surface, causing damage to the magnetic disk slider. There was a problem in that the flying posture was disturbed and became unstable, causing the disk to collide with and damage the disk surface.

In view of the above-mentioned conventional problems, the present invention provides a new magnetic disk device that eliminates the occurrence of head crashes caused by head adhesion to magnetic disks and lubricant accumulation, and enables stable high-density recording. The purpose is to provide

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention is an integrated magnetic head in which a large number of planar thin film magnetic heads are arranged in a plane and radially opposite to the recording surface of a magnetic disk mounted on a rotating mechanism. The structure is such that the plates are arranged one on top of the other.

The magnetic head stacking plate is fixed to the magnetic disk and has a plurality of planar thin film magnetic heads corresponding to respective recording tracks on the recording surface.

The magnetic head stacking plate is supported by a moving means movable in a direction perpendicular to the recording tracks of the magnetic disk, and has a planar thin-film magnetic head whose number is smaller than the number of recording trunks of the magnetic disk. .

Further, the moving means for the magnetic head stacking plate is composed of a piezoelectric element, and the piezoelectric elements are attached at a plurality of locations around the magnetic head stacking plate and between the inner wall of the container.

Further, the size of the magnetic head stacking plate is large enough to cover the entire recording surface of one side of the magnetic disk, and a liquid lubricant is continuously or intermittently applied between the magnetic disk and the magnetic head stacking plate. The structure is equipped with a mechanism for supplying

Furthermore, a solid lubricant is applied to one or both surfaces of the magnetic disk and the magnetic head integrated plate.

[For production]

The magnetic disk device of the present invention has a magnetic head stacking plate in which the same number of planar thin-film magnetic heads are arranged radially in a plane facing a recording surface of a magnetic disk, each corresponding to the recording tracks on the recording surface. A configuration in which the thin-film magnetic head corresponding to a predetermined recording track is used to record and reproduce information without head seeking with respect to a rotating magnetic disk, or as a magnetic/node accumulation plate. The planar thin-film magnetic heads, the number of which is smaller than the number of recording tracks on the magnetic disk, are arranged radially on a plane, and the magnetic head stacking plate is a piezoelectric magnetic head that is movable in a direction perpendicular to the recording trunk of the magnetic disk. Information is recorded and recorded by a thin-film magnetic head that is attached to and supported at multiple locations on the inner wall of the surrounding storage container via moving means such as elements, performs minute head seek on a rotating magnetic disk, and corresponds to a predetermined recording track. It is configured to perform playback, and by finely adjusting and controlling the gap between the magnetic disk and the magnetic head stacking plate, stable high-density recording and playback are possible.

Further, by providing a structure in which liquid lubricant is continuously or intermittently supplied between the magnetic disk and the magnetic head stacking plate by the lubricant supply circulation mechanism, the rotating magnetic disk is connected to the magnetic head stacking plate. The abrasion resistance is improved because it rotates smoothly without coming into direct contact with the glass plate, just like two glass plates wet with water, sliding without touching each other.

Furthermore, contact sliding can be improved by applying a solid lubricant such as molybdenum disulfide to the surface of the magnetic disk or the magnetic head assembly plate, or both surfaces, without using the lubricant supply circulation mechanism. Improves wear resistance against motion. As a result, stable high-density recording and reproduction is possible without crash failure, and reliability is also improved.

Embodiment C] Embodiments 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, FIG. 2 is a plan view for explaining an embodiment of a magnetic head integrated plate of the present invention, and FIG. 1 is a partially enlarged sectional view of a combination configuration of a magnetic disk and a magnetic head integrated plate according to the invention; FIG.

In FIG. 1, reference numeral 3 denotes a plurality of magnetic disks mounted on a rotating spindle 2 in a rotating mechanism via a hub (not shown). A pair of planar magnetic head stacking plates 4a and 4b having slightly larger inner and outer diameters are arranged so as to be sandwiched therebetween, and a plurality of locations around them are fixed to the inner wall or the like of the airtight container 1 of the device by fixing members 5. ing.

The reason why the magnetic head stacking plates 4a, 4b have slightly larger inner and outer diameters than the magnetic disk 3 is that a liquid lubricant is supplied between the magnetic head stacking plates 4a, 4b and the magnetic disk 3, which will be described later. This is to prevent the formation of unlubricated areas where the liquid lubricant is not supplied.

Further, the magnetic disk 3 is made of Co-coated material on a glass substrate, for example.
It has a structure in which a magnetic recording film made of Cr or the like is deposited.

Furthermore, as shown in FIG. 2, the magnetic head integrated plates 4a and 4b are made of a planar thin film magnetic film having the same number of recording tracks as the number of recording tracks on the surface of the magnetic disk 3 on a non-magnetic substrate 1) such as ANzO3.TiC. A throat 12 is formed and arranged. For example, when targeting a 5-inch magnetic disk, 2000
At a density of tracks/inch, 3000 planar thin film magnetic nodules 12 are radially divided into 32 groups as shown by chain lines, and each recording track 7 is arranged at a pitch of approximately 400 μm.
They are arranged so that they correspond to each other.

The thin film magnetic heads 12 of each group may be arranged in a straight line in the radial direction as shown by the chain line, for example, in a diagonal line or in an arc line in the radial direction. They may be arranged arbitrarily.

An IC (not shown) for processing recording/reproduction signals is mounted on the back surface of the magnetic head integrated plates 4a, 4b, and a signal connection circuit (not shown) from the IC to each planar thin film magnetic head 12 is provided through a through hole. etc.

A small lubricant supply pump 6 made of, for example, a diaphragm type is connected to the innermost circumferential portion of each magnetic head accumulation plate 4a, 4b, and a small lubricant supply pump 6, such as a diaphragm type, is connected to the innermost circumferential portion of each magnetic head accumulation plate 4a, 4b. 20~30C3
A supply pipe 7 for supplying a fluorocarbon-based liquid lubricant with a low viscosity (room temperature) of t (cm2/s) is disposed, and the base portion 1a is provided with the magnetic disk 2, the magnetic head integrated plate 4a,
a collection hole 8 for collecting the liquid lubricant that overflows and flows down from the outer circumferential side after being supplied from the inner circumferential side to the gap with the lubricant 4b;
The liquid lubricant supplied to the supply pipe 7 side and the liquid lubricant flowing into the collection hole 8 are collected through a filter and sent to the small lubricant supply pump 6, and the lubricant is again supplied to the supply pipe 7 side. A supply circulation mechanism is provided.

In order to sandwich a pair of flat magnetic head stacking plates 4a and 4b so as to face the front and back surfaces of each magnetic disk 3, first, a pair of magnetic head stacking plates 4a and 4b are placed on the front and back surfaces of each magnetic disk 3. The magnetic disks 3 are arranged with a slightly wider gap, and then the magnetic disk 3 is rotated while the lubricant supply circulation mechanism supplies liquid lubricant to the gap between the two magnetic head stacking plates 4a and 4b, as shown in FIG. The pair of magnetic head stacking plates 4a, 4b are gradually pressed against the surface of the magnetic disk 3 by means of gap adjustment screws 9 disposed at, for example, four locations around the magnetic disk 3, and the supply amount of the lubricant is controlled so that they can be mutually separated. Adjust the gap so that it becomes an appropriate minute gap.

In this way, the magnetic head integrated plates 4a and 4b are arranged in a slightly floating state through the liquid lubricant between them and the surface of the magnetic disk 3.

Thereafter, by continuously or intermittently supplying liquid lubricant so that the mutual gap is always filled,
The magnetic disk 3 rotates against the magnetic head accumulation plates 4a and 4b, like two glass plates wet with water, without any resistance, maintaining smooth sliding without touching or separating. It becomes possible to stably record/reproduce information on a predetermined recording track of the magnetic disk 3 by the corresponding thin-film magnetic head 12 without causing a crash.

FIG. 4 is a schematic side sectional view showing another embodiment of the magnetic disk device according to the present invention, and FIG. 5 is a plan view for explaining another embodiment of the magnetic head integrated plate of the present invention. 1 and 2 are designated by the same reference numerals.

The difference between the embodiment shown in these figures and the example shown in FIGS. 1 and 2 is that the front and back surfaces of each magnetic disk 3 mounted on a rotating spindle 2 in a rotating mechanism via a hub (not shown) face each other. A pair of planar magnetic head stacking plates 21a21b, which are arranged to be sandwiched between each other and have slightly larger inner and outer diameters than the magnetic disk 3, contact the inner wall of the airtight container 1 of the device at a plurality of locations around them. The magnetic head integrated plates 21a and 21b are movably fixed via a means, for example, a piezoelectric element 22, for making minute movements (seek) in a direction intersecting the recording trunk on the three surfaces of the magnetic disk.

Further, as shown in FIG. 5, the magnetic head integrated plates 21a and 21b are, for example, AI! 203. A planar thin film magnetic head 1 having a number of, for example, 1/3 of the number of recording tracks on the three surfaces of the magnetic disk is mounted on a non-magnetic substrate 1) such as TiC.
2 are formed and arranged. For example, in the case of a 5-inch diameter magnetic disk, 1000 planar thin-film magnetic heads 12 are arranged radially in 16 groups at a density of 2000 racks/inch, corresponding to each recording track, as shown by the chain lines. It was divided and arranged to correspond to each recording trunk at an interval of about 2.41 inches.

and the magnetic disk 3 and the magnetic head integrated plate 21a,
By rotating the magnetic disk 3 while continuously or intermittently supplying liquid lubricant between the lubricant supply circulation mechanism and the lubricant supply circulation mechanism between the magnetic disk 21b and the lubricant supply circulation mechanism, magnetic head integrated plate 21a,
21b is minutely moved (seek) in a movement range of several mm in a direction intersecting the recording track by a moving means consisting of a piezoelectric element 22, and information is recorded and recorded by the planar thin film magnetic head 12 corresponding to a predetermined recording track. This is to enable playback.

In such a device configuration, the magnetic head integrated plate 21a
, 21b, the number of planar thin film magnetic heads 12 disposed on the magnetic head integrated plate 21a, 21b is small.
21b is easy to form, resulting in low cost, and this embodiment also provides the same effects as the embodiment shown in FIG. 1.

In the above embodiments, a fluorocarbon-based liquid lubricant is used as the liquid lubricant used in the lubricant supply circulation mechanism, but in addition to these, a solvent such as isopropyl alcohol may also be used. It is also possible to use a surfactant such as sodium laurate appropriately diluted with water.

Further, in the above embodiments, a configuration has been described in which liquid lubricant is continuously or intermittently supplied between a magnetic disk and a magnetic head stacking plate by a lubricant supply circulation mechanism. For example, by using the rotation of a rotating spindle on which a magnetic disk is mounted, the pressure inside the airtight container is increased, and the vapor of a lubricant with a low vapor pressure is introduced from the inside along the spindle between the magnetic disk and the magnetic head stacking plate. Alternatively, a solid lubricant such as molybdenum disulfide, excluding an oil-based solid lubricant, is supplied between the magnetic disk and the magnetic head assembly plate, or on one surface or both surfaces. Or, for example, Zr, which has lubricity
5z+ VSz+ Nb5z, Ta5z, wSz.

Sulfides such as ReS, WSe2. MoSe2. Nb
Similar good lubrication effects can be obtained by depositing a film or powder of selenides such as Se2, nitrides such as NB, substances with a layered lattice structure such as graphite, or fluorides such as CF4. It will be done.

Furthermore, the method for forming these lubricating films is not limited to the sputtering method; for example, after depositing a metal thin film, which is the base material of the lubricating film, on the surface of a magnetic disk or magnetic head integrated plate, the thin film can be chemically coated. A method of forming a lubricating film made of sulfide through sulfurization treatment, etc., or a method of imparting lubricity by mechanically rubbing solid lubricant powder onto the surface can be selected and applied as appropriate. .

〔Effect of the invention〕

As is clear from the above description, according to the magnetic disk device according to the present invention, the magnetic disk and the magnetic head stacking plate on which a large number of planar thin film magnetic heads are arranged are coated with a fluid liquid lubricant or an oil-based lubricant. This enables information to be recorded and reproduced through head-less seek or extremely minute henodic seek, which prevents problems such as crashes caused by head adsorption or lubricant build-up. This eliminates this problem, enables stable high-density recording and playback and high-speed processing, and significantly improves the reliability of the device, resulting in valuable 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 illustrating an embodiment of a magnetic head integrated plate of the present invention, and FIG. FIG. 4 is a schematic side sectional view showing another embodiment of the magnetic disk device according to the invention; FIG. FIG. 7 is a plan view for explaining another embodiment of the integrated board. 1 to 5, 1 is an airtight storage container, 1a is a base portion, 2 is a rotating spindle, 3 is a magnetic disk, and 4a. Figure 1 Good 3θR^ to -4, 74d bird to f boat fishing tta
21 m of nth μ surface 4b, 21a, 21b are magnetic head accumulation plates, 5 is a fixing member, 6 is a small lubricant supply pump, 7 is a supply pipe, 8 is a collection hole, 9 is a gap adjustment screw, 1) 12 represents a nonmagnetic substrate, 12 represents a planar thin film magnetic head, and 22 represents a piezoelectric element. Figure 3

Claims (6)

[Claims] (1) A large number of planar thin-film magnetic heads (1
2) A magnetic disk device characterized in that magnetic head stacking plates (4a, 4b) arranged planarly and radially are arranged one on top of the other. (2) The magnetic head integrated plate (4a, 4b) is fixed to the magnetic disk (3) and has a plurality of planar thin film magnetic heads (12) corresponding to each recording track on the recording surface. The magnetic disk device according to claim 1, characterized in that: (3) The magnetic head stacking plates (21a, 21b) are supported by a moving means (22) so as to be movable in a direction perpendicular to the recording tracks of the magnetic disk (3), and 2. The magnetic disk device according to claim 1, further comprising a small number of planar thin film magnetic heads. (4) The moving means (22) of the magnetic head stacking plates (21a, 21b) is composed of a piezoelectric element, and the piezoelectric element is arranged at multiple locations around the magnetic head stacking plates (21a, 21b) and in the storage container (1). 4. The magnetic disk device according to claim 3, wherein the magnetic disk device is attached between inner walls of the magnetic disk device. (5) The magnetic head integrated plate (4a, 4b, 21a, 2
1b) is large enough to cover the entire recording surface of one side of the magnetic disk (3), and between the magnetic disk (3) and the magnetic head integrated plate (4a, 4b, 21a, 21b). 4. The magnetic disk drive according to claim 1, further comprising a mechanism for continuously or intermittently supplying the liquid lubricant. (6) The magnetic disk (3) and the magnetic head integrated plate (4)
4. The magnetic disk device according to claim 1, 2, or 3, wherein a solid lubricant is applied to one or both surfaces of (a, 4b, 21a, 21b).