JPH06162651A - Magnetic disk apparatus - Google Patents

Abstract

PURPOSE:To make an apparatus thin and to make a write and read speed fast by forming a stator core for a spindle motor, a plate spring for holding a magnetic head and a yoke for a magnetic-head positioning mechanism part respectively with specific metals. CONSTITUTION:A magnetic disk is fixed to a spindle hub 2 by a screw 4 via a clamper 3. A magnet 5 is installed at the inside of the hub 2, and a stator core 7 for a spindle motor installed so as to face it is made of an iron-based amorphous alloy. Since the permeability of the alloy is higher than that of an iron core made of silicon steel plates and the stator core can be made thin, a disk apparatus can be made thin. A magnetic head 11 is held at the tip part of a plate spring 12 made of a titanium alloy. Yokes 14, 15 for the positioning mechanism part of the head 11 are made of an iron-based amorphous alloy. Thereby, the disk apparatus can be made thin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk for storing information, a spindle motor for rotating the magnetic disk, and recording and recording of information on a storage surface of the magnetic disk held by a tip end portion of a leaf spring. The present invention relates to a magnetic disk device that includes a magnetic head that performs reproduction and a positioning mechanism that positions a specified cylinder of the magnetic disk by giving a rotational movement to the magnetic head.

[0002]

2. Description of the Related Art A magnetic disk for storing information, a spindle motor for rotating the magnetic disk, and a magnetic head for holding and recording information on the storage surface of the magnetic disk which is held at the tip of a leaf spring. In a conventional magnetic disk device including a positioning mechanism that positions a specified cylinder of a magnetic disk by giving a rotational movement to a magnetic head, a stator core of a spindle motor is formed of a silicon steel plate, The leaf spring is made of stainless steel plate, and the yoke of the positioning mechanism is made of soft iron.

[0003]

In the conventional magnetic disk device as described above, since the stator core of the spindle motor is formed of a silicon steel plate, the magnetic permeability is low, and therefore the coil wound around the stator core. It is difficult to make the stator core thin because the magnetic flux generated by passing an electric current through it is difficult to pass through, and thus requires a large cross-sectional area.
It has a drawback that it is difficult to make the magnetic disk device thin.

Further, since the leaf spring for holding the magnetic head is made of a stainless steel plate, it is heavy in weight and has a large inertia when the positioning mechanism section gives a rotating motion to the magnetic head, so that the positioning time is long. It has the drawback of taking a long time.

Further, since the yoke of the positioning mechanism portion for driving the rotational movement of the magnetic head is formed of soft iron, the magnetic permeability is low, so that the magnetic flux generated by the magnet of the positioning mechanism portion is unlikely to pass through, so that It is difficult to make the yoke thin because it requires a large cross-sectional area, which is why
It has a drawback that it is difficult to make the magnetic disk device thin.

[0006]

A magnetic disk device of the present invention comprises a magnetic disk for storing information, a spindle motor for rotating the magnetic disk, and a magnetic head provided corresponding to the storage surface of the magnetic disk. A magnetic disk device comprising a leaf spring for holding the magnetic head at a tip portion thereof, and a positioning mechanism portion for giving a rotational movement to the magnetic head and the leaf spring, wherein a stator core of the spindle motor is made of an iron system. It is made of an amorphous alloy, the leaf spring is made of a titanium alloy, and the yoke of the positioning mechanism is made of an iron-based amorphous alloy.

[0007]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of the present invention.

In the embodiment shown in FIG. 1, a magnetic disk 1 for storing information is fixed to a spindle hub 2 with a screw 4 via a clamper 3. A magnet 5 is provided on the inner surface of the spindle hub 2, and a stator core 7 around which a magnet 8 is provided and on which a winding 8 is wound is attached to a base 6. The stator core 7 is made of an iron-based amorphous alloy, generates a magnetic flux by supplying an electric current to the winding 8, and applies a rotational force to the spindle hub 2 by the repulsive force with the magnetic field of the magnet 5. ing.

Two bearings 9 are provided on the inner surface of the portion of the base 6 which holds the stator core 7, and these bearings 9 are provided.
Since the shaft 10 protruding downward from the center of the spindle hub 2 is rotatably held by the spindle hub 2, the spindle hub 2 rotates together with the magnetic disk 1. The magnet 5, the stator core 7, and the winding 8 form a spindle motor.

Since the stator core 7 is made of an iron-based amorphous alloy, it has a higher magnetic permeability than that of a conventional stator core made of a silicon steel plate, and the stator core can be made thinner accordingly. Therefore, the magnetic disk device can be made thin.

A magnetic head 11 provided corresponding to the storage surface of the magnetic disk 1 is held at the tip of a leaf spring 12 made of a titanium alloy, and information is recorded on the storage surface of the magnetic disk 1. Record and play. Leaf spring 12
Is held by the rotation mechanism section 13 and
The magnetic head 11 is positioned on the designated cylinder of the magnetic disk 1 by the rotational movement of the magnetic disk 11.

Since the leaf spring 12 is made of a titanium alloy, it is lighter in weight than the conventional leaf spring made of a stainless steel plate, and therefore has a small inertia during pivotal movement, so that the positioning time is short. can do.
Therefore, it is possible to obtain a magnetic disk device having a high information writing / reading speed.

A coil 18 is mounted on the rotating mechanism portion 13, and magnets 16 and 17 are provided on both sides of the coil 18 so as to face each other. Magnets 16 and 1
7 is fixed to the base 6 via yokes 14 and 15 each formed of an iron-based amorphous alloy. Therefore, by supplying a current to the coil 18, a magnetic flux is generated, and the repulsive force of the magnetic fields of the magnets 16 and 17 drives the rotational movement of the rotation mechanism section 13. The rotating mechanism 13, the coil 18, the magnets 16 and 17, and the yokes 14 and 15 form a positioning mechanism.

Since the yokes 14 and 15 are formed of an iron-based amorphous alloy, they have a higher magnetic permeability than that of a conventional yoke formed of soft iron, and the yoke can be made thinner accordingly, and therefore the magnetic disk device. Can be made thin.

[0016]

As described above, in the magnetic disk device of the present invention, the stator core of the spindle motor for rotating the magnetic disk is made of an iron-based amorphous alloy, and the leaf spring for holding the magnetic head is made of a titanium alloy. By forming and forming the yoke of the positioning mechanism that drives the positioning operation of the magnetic head from an iron-based amorphous alloy, it is possible to obtain a thin magnetic disk device with a high information writing / reading speed. .

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Magnetic Disk 2 Spindle Hub 3 Clamper 4 Screw 5 Magnet 6 Base 7 Stator Iron Core 8 Winding 9 Bearing 10 Shaft 11 Magnetic Head 12 Leaf Spring 13 Rotation Mechanism 14/15 Yoke 16/17 Magnet 18 Coil

Claims (6)

[Claims] 1. A magnetic disk for storing information, a spindle motor for rotating the magnetic disk, a magnetic head provided corresponding to a storage surface of the magnetic disk, and a leaf spring for holding the magnetic head at a tip portion. And a magnetic disk device including a positioning mechanism section that imparts rotational movement to the magnetic head and the leaf spring, wherein the stator core of the spindle motor is formed of an iron-based amorphous alloy. apparatus. 2. The magnetic disk drive according to claim 1, wherein the leaf spring is made of a titanium alloy. 3. The magnetic disk device according to claim 1, wherein the yoke of the positioning mechanism portion is formed of an iron-based amorphous alloy. 4. A magnetic disk for storing information, a spindle motor for rotating the magnetic disk, a magnetic head provided corresponding to the storage surface of the magnetic disk, and a leaf spring for holding the magnetic head at the tip. A magnetic disk device comprising: a magnetic head; and a positioning mechanism section that imparts a rotational motion to the plate spring, wherein the plate spring is made of a titanium alloy. 5. The magnetic disk drive according to claim 4, wherein the yoke of the positioning mechanism section is formed of an iron-based amorphous alloy. 6. A magnetic disk for storing information, a spindle motor for rotating the magnetic disk, a magnetic head provided corresponding to a storage surface of the magnetic disk, and a leaf spring for holding the magnetic head at a tip portion. A magnetic disk device comprising: a magnetic head and a positioning mechanism section that imparts a rotational movement to the leaf spring; wherein a yoke of the positioning mechanism section is formed of an iron-based amorphous alloy.