JPH04263166A - Hard-disk device - Google Patents

Abstract

PURPOSE:To increase the memory capacity of a hard-disk device. CONSTITUTION:S-poles and N-poles of permanent magnets 12 are magnetized alternately at the outer circumferential part of a magnetic-disk main body 11. An iron core 61 is arranged at the circumference of a magnetic disk 1; coils C1, C2,... which are faced with the permanent magnets 12 are wound on the iron core 61. The magnetic disk 1 is coupled to a shaft 21 via pressure plates 24 arranged at the upper part and the lower part of the magnetic disk 1 and via a hub 21. The shaft 25 is attached to a base plate 3 so as to be turned freely. At this constitution, when an electric current is made to flow to the coils C1, C2,... sequentially under the control of a microcomputer or the like, a turning effort is generated at the permanent magnets 12. Thereby, the magnetic disk 1 is turned by using the shaft 25 as the center. Consequently, since a spindle part 2 supports only the rotation of the magnetic disk 1, the outside diameter of the pressure plates 24 and the hub 21 can be made comparatively small. Thereby, the recording range R of the magnetic disk 1 can be expanded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hard disk drive used as an auxiliary storage device of a computer.

0002

2. Description of the Related Art Various types of storage devices are used as auxiliary storage devices for computers. Among these, hard disk devices that use magnetic disks as storage media are often used from the viewpoints of cost, storage capacity, and operability.

FIG. 6 shows a conventional hard disk device. The magnetic disk 1 is capable of recording on both sides, and a plurality of disks (two disks in this example) are arranged above and below and attached to the spindle section 2. The spindle part 2 has a base plate 3
It is driven at a high speed (several thousand revolutions/minute) by a flat motor 31 fixed to (FIG. 7).

Reading and storage of magnetic disks 1 are performed by magnetic heads 41 placed on both sides of each magnetic disk 1. The magnetic head 41 is attached to the tip of a head arm 43 that pivots about a vertical shaft 42 by appropriate means. The head arm 43 supports the magnetic disk 1 by means of a multi-stage guide plate 44 installed on the base side.
It is regulated to move correctly in a plane parallel to . This allows the magnetic head 41 to move along the radial direction of the magnetic disk 1 without contacting the magnetic disk 1. Each of the above-mentioned components is housed in an outer case 51 and is substantially sealed with an upper lid 52.

FIG. 7 is a sectional view of the spindle section 2. As shown in FIG. A hub 21 is fixed to a rotating shaft 32 of a flat motor 31 fixed to a base plate 3. A bearing 33 is interposed between the rotating shaft 32 and the base plate 3. The outer circumferential side of the hub 21 is formed into a stepped shape, and the two magnetic disks 1 are connected to a ring-shaped spacer 22 at the lower step.
It is placed in between. The magnetic disk 1 has a hub 21
The hub 21 is tightened and fixed by being pressed toward the lower part of the hub 21 by a presser plate 24 fixed to the upper part with a plurality of screws 23. Thereby, the rotational force of the flat motor 31 rotating at high speed is transmitted to the magnetic disk 1.

In such a hard disk drive, since the flat motor 31 rotates at high speed, in order to reliably transmit the rotational force to the magnetic disk 1, the outer diameter of the hub 21 to which the rotational force is transmitted must be increased. Must. This is because the rotational moment applied to the hub 21 is large, and the magnetic disk 1 cannot be securely fixed to the hub 21 unless the hub 21 has a certain diameter. Therefore, in order to increase the pressing force of the holding plate 24 and therefore the tightening force of the screw 23 as much as possible, and to increase the contact area with the magnetic disk 1 as much as possible, the outer diameter D of the hub 21 is
is relatively large.

[0007]

[Problems to be Solved by the Invention] Various storage devices used in computers are required to be smaller and have larger capacities, and it is also possible to increase the storage capacity of the above-mentioned hard disk devices without changing the size. It would be advantageous if possible. The storage capacity of the hard disk device shown in FIG. 6 is determined by the recording range R of the magnetic disk 1. Therefore, if the recording range R is widened, the storage capacity will naturally increase, but if the outer circumference is widened, the magnetic disk 1 will become larger, which is not preferable.

Furthermore, in the spindle structure using a motor as shown in FIG. 7, the outer diameter D of the hub 21 cannot be made small for the reasons mentioned above. Therefore, it is also difficult to expand the recording range on the inner circumferential side.

Therefore, the present invention solves the above-mentioned problems, and proposes a disk device that can increase the storage capacity even when using magnetic disks 1 of the same diameter. It is something to do.

0010

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a hard disk device used as an auxiliary storage device of a computer, which is a storage medium having a ring-shaped rotor on its outer periphery. It is equipped with a disk for use in the rotor, and a stator that generates rotational force in the rotor.

[0011]

In the first embodiment shown in FIG. 1, the S and N poles of permanent magnets 12 are alternately fixed to the outer circumferential side of the magnetic disk body 11, and the magnetic disk 1 is formed as a rotor. A ring-shaped iron core 61 is arranged around the magnetic disk 1, and a permanent magnet 12 is attached to this iron core 61 as shown in FIG.
Coils C1, C2... facing each other are wound,
It is formed as a stator.

In such a configuration, the coil C1,
A rotating magnetic field is generated by sequentially passing current through C2, . Therefore, since the spindle part 2 only supports the rotation of the magnetic disk 1, the outer diameter D of the hub 21 (FIG. 3) and the holding plate 24 can be made relatively small, and the inner circumference of the magnetic disk 1 can be made relatively small. The side recording range R can be expanded.

In the second embodiment shown in FIGS. 4 and 5, the magnetic disk 1 and the stator 7 constitute an ultrasonic motor, and the spindle section 2 is connected to the magnetic disk 1 as in the first embodiment. It only supports rotation. Therefore, the outer diameter D of the hub 21 and the presser plate 24 is reduced, and the recording range R on the inner circumferential side of the magnetic disk 1 can be expanded.

[0014]

Embodiments Next, embodiments of the hard disk drive according to the present invention will be described in detail with reference to the drawings. The same reference numerals as in the previous figure have the same structure, so the explanation thereof will be omitted.

FIG. 1 shows a magnetic disk 1 according to a first embodiment and a coil section 6 arranged around the magnetic disk 1. As shown in FIG. A permanent magnet 12 is formed on the outer periphery of the magnetic disk body 11 by alternately magnetizing S poles and N poles at a predetermined pitch over the entire circumference. In the coil portion 6, a plurality of coils C1, C2... are arranged around the entire circumference of the ring-shaped iron core 61.
・(Only part shown) is wrapped in parts. in this case,
Magnetic flux (rotating magnetic flux) generated by energizing the coils C1, C2, . . . is wound around the iron core 61 so as to cross the permanent magnet 12.

As shown in FIG. 2, the coil portion 6 is disposed facing the permanent magnet 12 with a slight distance therebetween. iron core 61
is fixed to the base plate 3 (FIG. 3) by appropriate means. Further, the magnetic disk 1 is rotatably mounted on a base plate 3 by a spindle portion 2.

In the spindle section 2, as shown in FIG. 3, the lower side of the rotating shaft 25 is rotatably attached to the base plate 3 via a bearing 33. A hub 21 is fixed to or integrally formed approximately in the middle of the rotating shaft 25 . Two magnetic disks 1 are fitted into the upper side of the hub 21 with a spacer 22 in between.

The magnetic disk 1 has a screw 23 on the rotating shaft 25.
It is tightened and fixed to the hub 21 side by a presser plate 24 fixed at. A retaining plate 26 for the rotating shaft 25 is screwed to the lower end of the rotating shaft 25. A bottom cover 34 fixed to the base plate 3 is for protecting the rotating shaft 25 and the bearing 33.

As can be seen from the above, this hard disk drive is configured as a ring core motor in which the magnetic disk 1 is a rotor and the coil portion 6 is a stator. Therefore, each coil C1, C2, . . . of the coil section 6 is controlled by a microcomputer or the like.
By sequentially passing an excitation current through Cn, the generated rotating magnetic field causes the magnetic disk 1 to move around the rotating shaft 2 of the spindle section 2.
Rotate around 5.

That is, the spindle section 2 is connected to the magnetic disk 1.
It is not provided to transmit the rotational force of a motor or the like to the magnetic disk 1, but is provided to support the rotation of the magnetic disk 1. Therefore, since there is no need to consider the rotational transmission as described above, the contact area between the magnetic disk 1 and the hub 21 can be made smaller than that shown in FIG. D can be made small. Thereby, the recording range R on the inner circumferential side of the magnetic disk 1 can be widened.

In the first embodiment described above, a ring core motor is constructed in which the magnetic disk 1 and the coil section 6 disposed around it constitute a rotor and a stator, respectively.
As an example, as shown in FIGS. 4 and 5, it is also possible to configure an ultrasonic motor using the magnetic disk 1 as a rotor.

As shown in the figure, the magnetic disk body 11
A ring-shaped moving body 13 is fixed to the outer periphery of the ring. A ring-shaped stator 7 is arranged within the space between the magnetic disks 1 so as to come into contact with the upper and lower movable bodies 13. The stator 7 is a piezoelectric element 7 such as PZT (lead zirconate titanate).
1 and a vibrating body 72 bonded to both sides of this piezoelectric element 71.
It is made up of.

The magnetic disk 1 is placed on the surface side of the vibrating body 72.
A plurality of protrusions 73 that come into contact with the movable body 13 are provided in a ring shape at appropriate intervals from each other. These protrusions 73 are provided with cutouts 74 so that the head arm 43 (FIG. 1) can be moved. Note that the stator 7 is fixed to the base plate 3 (Fig. 3), and the magnetic disk 1
is rotatably mounted on the base plate 3 by a spindle portion 2 similar to that shown in FIG.

In the hard disk drive configured as described above, by applying a current of a predetermined frequency to the piezoelectric element 71 of the stator 7, vibration having a sinusoidal displacement distribution in the circumferential direction is generated in the protrusion 73. . The vibration of the protrusion 73 generates a rotational force in the movable body 13, which causes the magnetic disk 1 to rotate around the rotation axis 25 of the spindle section 2. Therefore, in this embodiment as well, since the spindle portion 2 only supports the rotation of the magnetic disk 1 as in the first embodiment, the outer diameter D of the holding plate 24, hub 21 (FIG. 3), etc. is made small. The recording range R of the magnetic disk 1 can be expanded.

[0025]

As described above, the present invention rotates a disk by generating rotational force on the outer circumference of the disk. Therefore, according to the present invention, since the spindle portion only supports the rotation of the disk, it is possible to reduce the outer diameter of the hub for connecting the rotating shaft and the disk. This has the effect of expanding the recording range. Therefore, according to the present invention, the storage capacity of a disk having the same diameter as the conventional disk can be made larger than that of the conventional disk.

[Brief explanation of the drawing]

FIG. 1 is a top view showing the structure of a first embodiment.

FIG. 2 is a cross-sectional view of the coil portion of FIG. 1.

FIG. 3 is a sectional view of the spindle portion of FIG. 1;

FIG. 4 is a sectional view of the second embodiment.

FIG. 5 is an explanatory diagram illustrating the stator of FIG. 4;

FIG. 6 is a perspective view of a conventional example.

FIG. 7 is a sectional view of the spindle portion of FIG. 6;

[Explanation of symbols]

1 Magnetic disk 2 Spindle part 3 Base plate 6 Coil part 7 Stator 11 Magnetic disk body 12 Permanent magnet 13. Mobile object 21 Hub 24 Holding plate 25 Rotation axis 41 Magnetic head 43 Head arm 61 Iron core 71 Piezoelectric element 72 Vibrating body 73 Protrusion C1, C2... Coil R Recording range

Claims (1)

[Claims] 1. A hard disk device used as an auxiliary storage device of a computer, etc., comprising a storage medium disk provided with a ring-shaped rotor on its outer periphery, and a stator that generates rotational force in the rotor. A hard disk device characterized by: