JPH03212854A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To attain light weight and to prevent a coarse particulate invading by providing a magnetic disk with flexibility, a rotary supporting means to support rotatably the magnetic disk in a fixed state, and a container to seal and house a magnetic head. CONSTITUTION:This device is comprised mainly of two flexible magnetic disks 1, 1, a Bernoulli plate 2, a spindle motor 3 to drive the magnetic disks 1, 1, a stepper driving mechanism 5 comprising a magnetic head access means to turn arms 6, 6 which seek two magnetic heads 4, 4 in the radius direction the magnetic disks 1, 1, and an upper cover 8 to close a base plate 7. A packing material 18 is arranged at the joining part of the base plate 7 with the upper cover 8, and a control substrate 16 is arranged at the lower side of the base plate 7 with being covered with a lower cover 20. Thereby, the light weight and miniaturization can be attained, and the invasion of the coarse particulate can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device, and particularly to a magnetic disk device in which a flexible magnetic disk is used in a fixed manner.

[Conventional technology]

Recently, many products using hard magnetic disks have appeared, including personal computers. especially,
The spread of portable personal computers is remarkable, and cameras using magnetic disks have also been commercialized, making them popular as highly mobile products. Accordingly, the development of inexpensive and lightweight magnetic disk devices is desired.

[Problems that the invention attempts to solve]

In magnetic disk devices using conventional hard disks,
Since the magnetic disk itself is expensive, it is a burden in terms of cost. Furthermore, since the magnetic disk is a hard type, the weight of the entire magnetic disk device becomes heavy. Further, there are problems such as collision between the magnetic head and the magnetic disk due to vibration, and head crash caused by powder M that has entered the magnetic disk device entering between the magnetic head and the magnetic disk.

Further, in a magnetic disk device using a flexible magnetic disk, the magnetic disk can be attached to and removed from the magnetic disk device. Therefore, in order to prevent crosstalk from occurring, a certain amount of space is provided between the trunks of the magnetic disks, making it difficult to achieve high density and large capacity.

In view of the above problems, the present invention aims to reduce the weight, suppress the intrusion of dust, improve vibration resistance, and further increase the density and capacity of a flexible magnetic disk. The purpose is to

[Means to solve problems]

In a magnetic disk device that records and/or reproduces information on a magnetic disk using a magnetic head,
A flexible magnetic disk, a rotary support means for rotatably supporting the magnetic disk in a fixed state, a magnetic head access means for accessing the magnetic head to a predetermined position on the magnetic disk, and at least the magnetic head. The gist of the present invention is a magnetic disk device comprising a container that hermetically stores the magnetic disk and the rotation support means.

[Effect]

When a flexible magnetic disk is fixed and rotates at high speed, the magnetic disk becomes flat without waves, and the trace of the magnetic head becomes stable, allowing for higher density and larger capacity. It will be done. Furthermore, by using a flexible magnetic disk, the overall weight of the device can be reduced. In addition, collisions between the magnetic disk and the magnetic head, such as with hard disks, can cause scratches on the magnetic disk.
There is no need to worry about damaging the magnetic head. Furthermore, recording and/or reproducing performance is also improved by sealing at least a magnetic head, a magnetic disk, etc., which are dust-free, in a container.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a plan view of a magnetic disk device according to a first embodiment of the present invention with an upper cover 8 removed, and FIG. 2 is a side sectional view of the magnetic disk device. The magnetic disk device shown in these figures is arranged close to two flexible magnetic disks 1, 1 between these two magnetic disks 1, 1, and has a surface facing the magnetic disks 1, 1. A Bernoulli plate 2 having a disk shape and a surface having a Bernoulli effect, a spindle motor 3 for rotationally driving these magnetic disks 1, 1, and a spindle motor 3 for recording and/or recording information on the magnetic disks 1, 1, respectively. Two magnetic heads 4, 4 that perform reproduction, an arm 6.6 that supports the magnetic heads 4.
, a stepper drive mechanism 5 constituting a magnetic head access means for rotating the arm 6.6 in order to seek in 10 radial directions, and the above-mentioned parts are mounted and supported, for example, made of die-cast aluminum. It mainly consists of a base plate 7 and an upper cover 8 that closes the base plate 7.

The Bernoulli plate 2 has a thickness of about 0.3 mm, and its outer edge extends outward from the outer periphery of the magnetic disks 1,1. In addition, this outer edge portion is several μm in the direction of the magnetic disks 1 and 1.
The surface of the Bernoulli plate 20 is etched so as to protrude by m to several hundred μm.

Furthermore, this Bernoulli plate 2 is fixed to the base plate 7. On the other hand, the magnetic disk ↓, 1 is attached to the spindle hub 10, which is a rotational support means formed in the rotating part of the spindle motor 3, via a spacer (not shown).
Each is fixed with three screws. A PG magnet 11 is provided on the upper surface of this spindle hub 10.
A PG sensor 19, which will be described later, detects the rotation of the spindle motor 3 by detecting the magnetic flux 11 of the PG magnet. The spindle motor 3 configured as described above is mounted on the base plate 7 as shown in FIG. Next, a stepper drive mechanism 5, which is a magnetic head access means, is mounted on the base plate 7. This stepper drive mechanism 5 has a rotating shaft 12 . This rotating shaft 1
Two pinions are stacked on top of each other and connected to each other by a spring (not shown). By configuring the two pinions as described above, it is possible to prevent looseness in engagement with the rack 13, which will be described later, and to improve the accuracy of head positioning. The other end of the arm 6.6, to which the magnetic heads 4, 4 are attached, is formed with a rack 13 that engages the pinion. It is rotatably supported according to the rotation of the rotating shaft 12. This arm support shaft 14 is fixed on the base plate 7. The magnetic heads 4, 4 move in the radial direction on the magnetic disk surface with the rotational movement of the arm 6.6 about the arm support shaft 14, and perform recording and/or reproduction on a predetermined track. The magnetic disks 1, 1, the Bernoulli plate 2, and the magnetic heads 4, 4
are arranged parallel to each other, as shown in FIG.

Further, the magnetic disk 1.1 and the magnetic head 4.4 are arranged close to each other.

An upper cover 8 constituting a closed container is fixed to the base plate 7 configured as described above with four screws. A packing 18 made of, for example, an elastic material is disposed at the joint between the base plate 7 and the upper cover 8 in order to improve the degree of sealing inside the device. Further, a control board 16 that controls the drive of the magnetic disk device is arranged below the base plate 7 and is covered by a lower cover 20 .

Further, a connector (not shown) is provided at the tip of the control board 16 to be connected to the console computer, and projects to the outside of the lower cover 20.

Further, on the inner surface of the upper cover 8, a coil or the like is installed at a position corresponding to the PG magnet 11 provided on the upper surface of the spindle hub 10. A PG sensor 19 is provided, and the PG sensor 19 detects the magnetic flux of the PG magnet 11 every time the disk rotates, thereby controlling the number of rotations of the magnetic disks 1 and 10.

Next, the aforementioned magnetic head will be explained with reference to FIG.

As shown in FIG. 4, first, a gap G is formed in the magnetic head 4. As shown in FIG. A curved surface 4B is formed around this gap G to be in sliding contact with the magnetic disk 1. An inclined portion 4A is formed diagonally downward from the air inflow end side of the curved surface 4B. Furthermore, a stepped portion 4C of 100 μm or less is vertically provided on the air inflow end side of the curved surface 4B.

An inclined portion 4D is provided diagonally downward from the lower end of the stepped portion 4C.

Next, the effect will be explained. For convenience, the direction of rotation of the magnetic disk 10 is set as the direction of arrow B, as shown in FIG.

As the magnetic disk 1 rotates, an air flow enters from the air inflow end side of the magnetic head 4. However, part of the air flow flows down the slope 4AK (in the direction of arrow a). Therefore, the airflow (in the direction of the arrow) that enters between the magnetic disk 1 and the curved surface 4B is smaller than in the case without the inclined portion 4A. Furthermore, since the amount of dust in the airflow passing over the gear G is reduced, the adverse effect of dust on the magnetic disk 1 and the magnetic head 4 is reduced.

Further, the airflow that has passed over the gear G suddenly descends due to the stepped portion 4C, and flows out of the magnetic head 4 through the inclined portion 4DKG (in the direction of arrow C in FIG. 4). Therefore, the air that has passed over the cap G is returned to the gear G.
Prevents backflow to the side.

In this way, in the magnetic head 4 having the above structure, the airflow with relatively little dust flows between the magnetic disk l and the magnetic head 4.
Since the magnetic head 4 flows smoothly between the gap G and the magnetic head 4, it is affected by dust and becomes K<<, thereby extending the life of the magnetic head 4 itself.

The magnetic head 4 described above is supported by pads 15 that serve as supports shown in FIGS. 5A and 5B.

As shown in FIGS. 5A and 5B, the pad 15 is formed into a substantially mausoleum shape. A head attachment hole 15A in which the magnetic head 4 is attached is formed in the center of the pad 15.

Air inflow end 1111 of this pad 15! A tapered portion 15D is formed on the I (disc rotation upstream side). A side surface 15E on the outer circumferential side of the magnetic disk and a side surface 15F on the inner circumferential side of the pad 15 are formed in an arc shape with approximately the same curvature as the circumference of the magnetic disks 1 and 10.

Furthermore, a groove 15B with one end 15G closed is formed in the center of the pad 15 on the inner side surfaces 15H and 15I' having the same curvature as the arc shape of the side surfaces 15E and 15F of the pad 15. A pair of narrow grooves 15C are formed on both sides of the groove 15B of the pad 15, with the grooves being deep on the tapered part 15D side at the air inflow end and gradually becoming shallower toward the air outflow end. Further, the width is wide on the tapered portion 15D side and gradually narrows toward the air outflow end side.

Next, the effect will be explained. As shown above, first, by forming the tapered portion 15D as shown in FIG. Shiichi? It becomes j. Further, the airflow caused by the magnetic disk rotating 10 times flows in approximately the same arc shape as the magnetic disk l. Therefore, as described above, the side surface 15g on the outer circumferential side of the magnetic disk and the side surface 15FK on the inner circumferential side of the pad 15 are formed in an arc shape with approximately the same curvature as the circumference of the magnetic disk 10. Air flows smoothly, and unnecessary force applied to the pad 15 in the radial direction of the magnetic disk is reduced due to the air flow.

Further, the airflow enters between the magnetic disk 1 and the pad 150 from the tapered portion 15D, and the airflow flows through this gap at high speed. As this airflow flows into the groove 158K,
Negative pressure is generated in the groove portion 15B. Therefore, the magnetic disk l
produces an effect of being attracted to the pad 15 side.

The pad 15 described above is attached to the tip of the arm 6 and supports the magnetic head 4. Then, the stepper drive mechanism 5 drives the magnetic disk l.

1 to perform recording and/or playback on a predetermined track.

The control board 1 controls the movement of the magnetic head 4 on the disk surface.
This is done by a control circuit provided at 0.

Next, a servo mechanism for controlling the position of the magnetic head 4 to a predetermined track on the magnetic disk 1 will be explained.

First, we will explain why a servo mechanism is necessary.

Currently, flexible magnetic disks generally use organic polymer films such as polyethylene terephthalate as their base material. Furthermore, this magnetic disk having connectivity is made by pulling out the necessary portions of an organic polymer film from a rolled body and punching them into a circular shape. Therefore, when a disk is punched out, this film is always subjected to tension in the longitudinal direction of the roll body, so that the punched disk has anisotropy of elongation in the direction of tension. For this reason, magnetic disks are affected by temperature and humidity in a sealed container, and
As shown in the figure, it has a substantially elliptical shape. For this reason, we installed a servo mechanism.

Next, the servo mechanism in this embodiment will be explained.

FIG. 6 shows a flexible magnetic disk with elongation anisotropy.

As shown in Figure 6, with the center O of the disk as a reference,
For convenience, the direction in which elongation due to tension exists is set as the long axis @X (horizontal line), and the direction perpendicular to the long axis is set as the short axis Y (vertical line). In this embodiment, at least one servo sector is provided in the long axis X direction and at least one servo sector in the short axis Y direction. A zone P where no data is written is formed on the innermost side of the magnetic disk 1, and a data zone D and servo sectors 81 and 82 are formed on the outer side in the radial direction.

The servo sector is a servo sector S formed in the long axis X direction.
1 and a servo sector S2 formed in the short axis Y direction, both of which are located perpendicular to the center of the magnetic disk.

Then, as shown in FIG. 7, servo sectors S1 and S2
For each recording track T, a servo signal F is placed at a position equidistant from the center layer C in the longitudinal (circumferential) direction.
are written alternately in a staggered manner at the same frequency. In this case, since the same magnetic head 4 is used for recording, the track width of the servo signal F and the recording track T matches the length of the gear G of the magnetic head 4, and off-track, the position of the gap G of the magnetic head 4 is This is caused by deviation from the desired recording track T.

Figure 8 shows the head position correction method using the servo mechanism of the present invention.
It shows 0 charts.

First, the magnetic head 4 reads the servo information signals of each of the servo sector S1 in the long axis X direction and the servo sector S2 in the short axis Y direction in FIG. 6, and compares the servo correction values of the servo sectors S1 and S2. The presence or absence of the recording track T is confirmed by comparing the servo correction values. Here, if there is no eccentricity, the next servo information signal is read, but if there is eccentricity, the amount of eccentricity is calculated and the amount of eccentricity is corrected. Then, the eccentricity amount is compared with a preset correction amount calculation table. By comparing with this correction amount calculation table, the desired recording track T
Calculate the correction amount up to and output the control amount using this correction amount. With the correction means, the gap G of the magnetic head 4 is
If it is at the predetermined track position, tracking is performed as it is, and if it is not located at the set predetermined track position, position control is performed again.

According to the first embodiment, by using flexible magnetic disks 1, 1, it is possible to realize a lighter weight and lower cost than conventional node magnetic disks. Further, due to the flexibility of the magnetic disk 1.1, the magnetic head 4 does not damage the magnetic disk 1.1 and the magnetic head 4 due to impact, vibration, etc., and has excellent vibration resistance. Further, by placing the Bernoulli plate 2 between the magnetic disks 1 and 10, contact and close contact between the two magnetic disks 1.1 are prevented. With the air inflow hole 9, by rotating the spindle motor 3 at about 360 rpm,
Air flows in through the air inflow hole 9 and flows out from the inside to the outside of the surface of the Bernoulli plate 20, thereby preventing the magnetic disks 1, 1 from adhering to the Bernoulli plate 2. Next, by sealing the base plate 7 with the upper cover 8, it is possible to prevent dust from entering from the outside. Furthermore, since the structure allows the use of two magnetic disks 1, 1, the storage capacity increases by one disk. Further, by making the magnetic disk l fixed, the tracing of the magnetic head 4 is stabilized, and it is possible to increase the track capacity and capacity.

Next, the second embodiment of the present invention will be described in FIGS. 9 and 1.
This will be explained with reference to Figure 0.

FIG. 9 is a side sectional view of a magnetic disk drive according to a second embodiment of the present invention, and the same members as in FIG. 2 are given the same reference numerals. As shown in FIG. 9, in the second embodiment, two magnetic disks 1.1 are arranged close to each other with an interval of several tens of micrometers to several U, and each of the magnetic disks is fixed to a spindle hub 10 and pressurized so that it can rotate freely. . Magnetic heads 4, 4 are arranged on the outer side of each magnetic disk 1.1.

That is, this is a configuration in which the Bernoulli plate 2 is removed from the configuration of the first embodiment.

Further, FIG. 10 is an enlarged view showing the arrangement relationship between the magnetic head 4.4 and the magnetic disk 1.1 in FIG. 9. In FIG. 1O, magnetic disks 1 are arranged close to each other with a distance of several tens of μm between the magnetic disks 11.

1 rotates at a high speed of about 3600 rpm, so it has stability comparable to that of the Bernoulli plate 2.

Therefore, with respect to one magnetic disk 1, the other magnetic disk 1 functions as a flat plate exhibiting the Bernoulli plate effect. As a result, the Bernoulli plate in the first embodiment is not required, and it is possible to reduce the cost, weight, and price of the negative layer.

Note that the present invention is based on the magnetic disk 1 in the first embodiment.
Alternatively, the number of magnetic heads 4 may be reduced by one to create a configuration of one magnetic disk, one magnetic head, and one Bernoulli plate.

Furthermore, in the above configuration, if the magnetic disk 1 is made of a material that allows it to rotate stably by itself, the Bernoulli plate 2 is not necessarily required. That is, since the Bernoulli plate 2 is provided to stabilize the rotation of the magnetic disk, the Bernoulli plate is not required if the magnetic disk itself rotates stably.

With such a configuration, the storage capacity of one magnetic disk is reduced, but the number of component parts is reduced, so that the - layer can be made smaller and lighter.

Furthermore, if the magnetic disk has excellent wear resistance, it is not necessarily necessary to use a pad that has the effect of attracting the magnetic disk, which is a magnetic head support.

In other words, the pad 15 is provided to attract the magnetic disks so as to bring them into sliding contact only with the magnetic disks 1, 1, and to suppress the magnetic disks 1, 10W- notes as much as possible. Therefore, if there is no risk of wear on the magnetic disk, the pad 15 is not necessary.

〔Effect of the invention〕

As described above, in the present invention, since the flexible magnetic disk is fixed to the rotation support means, the magnetic head nodrace is stabilized, and it is possible to increase the track density and capacity. In addition, since a flexible magnetic disk is used for the magnetic disk, it is lighter and thinner than a hard magnetic disk, making it possible to reduce the weight and size. The negative impact on the magnetic disk due to vibrations is reduced, such as less damage to the magnetic disk due to contact with the magnetic disk.

Furthermore, by housing at least the magnetic head, the magnetic disk, and the magnetic disk rotation support means in a closed container, it is possible to particularly prevent dust from entering, which the magnetic head and the magnetic disk dislike. Furthermore, when the magnetic disk rotates, the support of the magnetic head attracts the magnetic disk and makes sliding contact only with the magnetic head, so that the magnetic disk is worn much less frequently. Further, by using two magnetic disks, many effects such as an increase in storage capacity can be achieved.

4. Kidney Sikan So.

FIG. 1 explains a first embodiment of the present invention. FIG. 2 is a side sectional view of the magnetic disk device. FIG. 3 is a side cross-sectional view of essential parts showing the configuration of a magnetic head, a magnetic disk, and a Bernoulli plate. FIG. 4 is a side sectional view of the magnetic head. FIG. 5A is a plan view of the magnetic head support device, and FIG. 5B is a sectional view taken along line A-A'i.

FIG. 6 is a plan view of a flexible magnetic disk on which servo sectors are arranged. FIG. 7 is a configuration diagram of a servo sector. FIG. 8 is a flowchart of head position correction using servo sectors. FIG. 9 is a side sectional view of the magnetic disk device in the second embodiment. Figure 10 shows
10 is a side view of a main part showing the configuration of the magnetic head and magnetic disk of FIG. 9. FIG.

DESCRIPTION OF SYMBOLS 1... Flexible magnetic disk, 2... Bernoulli plate, 4... Magnetic head, 8... Upper case, 1
0...Rotation support means (spindle knob), 15...
-Magnetic head support (pad).

Claims (4)

[Claims] (1) A magnetic disk device that records and/or reproduces information on a magnetic disk using a magnetic head, including a flexible magnetic disk and a rotation support means that rotatably supports the magnetic disk in a fixed state. A magnetic disk drive comprising: a magnetic head access means for accessing the magnetic head and a predetermined position of the magnetic disk; and a container for hermetically storing at least the magnetic head, the magnetic disk, and the rotation support means. (2) A magnetic head is disposed on one side of the magnetic disk, and a flat plate whose surface facing the magnetic disk has a Bernoulli effect is disposed on the other side.
Magnetic disk device described in section. (3) Due to the flow of gas on the surface of the rotating magnetic disk,
3. A magnetic disk drive according to claim 1, wherein said magnetic head is supported by a support member that attracts said magnetic disk toward said magnetic head. (4) forming a surface of the flat plate opposite to the side facing the magnetic disk into a surface having a Bernoulli effect, and arranging another flexible magnetic disk so as to face this surface; A magnetic disk according to claims 2 and 3, wherein a magnetic head for recording and/or reproducing information on the magnetic disk is arranged on the opposite side of the other magnetic disk to the side facing the flat plate. Device.