JPH08212753A - Rotary access type magnetic disk apparatus - Google Patents

Abstract

PURPOSE: To improve the rigidity and the assembling properties by fixedly supporting the shafts of a spindle motor and an actuator rotating along the outer circumference of the shaft vertically symmetrically with two yoke common to support plates of the same material as that of the yoke of a voice coil motor. CONSTITUTION: A spindle motor has a winding 9, a spindle hub 5, a magnet 6, etc., a plurality of magnetic disks 2 fixed to the hub 5 and rotated along the outer circumference of a shaft 8. An actuator holds a carriage 14, the bobbin coil 17 of a voice coil motor, a plurality of head arms 12, and a gimbal 11 rotatably along the outer circumference of a shaft 16. Further, magnetic heads 10 are held at the end of each gimbal 11, and both ends of the shafts 8, 16 are fixedly held at the two yokes common to plates 1 of the same material as that of the end of the gimbal 11. Thus, the rigidity, the magnetic shielding effect and the assembling properties of the structure can be improved to reduce the deformation due to heat, thereby simplifying a magnetic circuit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle motor having a plurality of magnetic disks on which a large amount of information can be written and read, and a plurality of magnetic heads for writing and reading information on the magnetic disks. The present invention relates to a magnetic disk device including a rotary access type actuator for positioning, and more particularly to a rotary access type magnetic disk device having a support structure capable of improving the rigidity of a structure and a magnetic shield effect.

[0002]

2. Description of the Related Art As a conventional technique relating to this type of magnetic disk device, there are known techniques described in, for example, Japanese Utility Model Publication No. 60-64463 and Japanese Utility Model Publication No. 60-64468. In these conventional techniques, a shaft of a spindle motor and a shaft of an actuator are rotatably supported by a base member which is a housing of a magnetic disk device.

[0003]

In the above prior art, the shaft of the spindle motor and the shaft of the actuator must be rotatably supported by the base member, and the spindle motor as the power source and the rotary access type actuator. Due to the improvement in rigidity of the entire magnetic disk device for preventing vibration generated by members such as a voice coil motor that drives the actuator, and the difference in thermal expansion coefficient due to the difference in material between these members and the base member. Insufficient consideration is given to the prevention of thermal deformation, and it has the problems of vibration and thermal deformation. In addition, the magnetic circuit of the voice coil motor is simplified, and the voice coil motor and spindle motor generate it. There is also a problem that there is a large amount of leakage magnetic flux, because there is no consideration for preventing leakage magnetic flux.

The object of the present invention is to solve the above-mentioned problems of the prior art, to have high rigidity against vibrations from a power source, to prevent thermal deformation, and to prevent leakage magnetic flux, thus providing a high magnetic shield effect. It is an object to provide a rotary access type magnetic disk device having a structure.

[0005]

According to the present invention, the object is to use a spindle motor that rotates the outer circumference of a non-rotating shaft and a rotary actuator that rotates the outer circumference of the non-rotating shaft, and to use the respective shaft and voice. This is achieved by vertically connecting two yoke / support plates that are part of the yoke with the same material as the yoke of the coil motor.

The two yoke-supporting plates, which are formed as a part of the yoke of the voice coil motor, make the spindle motor shaft that rotates around the non-rotating shaft and the rotary actuator that rotates around the non-rotating shaft. The structure for vertically connecting and supporting the shaft and the yoke of the voice coil motor for driving the actuator is a power source and also serves as a vibration source, and also has a dissimilar metal coupling. It becomes a structure that integrates the three parties. Since the two yoke-supporting plates form a part of the yoke of the voice coil motor and are made of the same material as the yoke, they have higher rigidity than the members constituting the spindle motor and the actuator, and the spindle motor. Since the actuator and the actuator are integrally supported from above and below by the yoke and support plate, the structure has high rigidity against vibration. Further, since the yoke / support plate supports the spindle motor and the actuator in a vertically symmetrical shape and constitutes a part of the yoke of the voice coil motor, the spindle motor and the actuator are prevented from falling and warping due to heat of both shafts. By restraining them, relative tilt between them can be eliminated, the magnetic circuit of the voice coil motor can be simplified, and the leakage magnetic flux from the magnetic circuit can be reduced. Further, the base of the magnetic disk device and the rotating system and the access system can be separated from each other, and work such as writing of servo tracks can be performed separately from the base of the magnetic disk device. It is possible to improve the assemblability.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a rotary access type magnetic disk device according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a sectional view showing the structure of an embodiment of the present invention, and FIG. 2 is a plan view. 1 and 2, 1 is a yoke / support plate, 2 is a magnetic disk, 3 is a disk lamp, 4 and 13 are spacers, 5 is a spindle hub, 6 and 19 are magnets, 7 and 15 are bearings, 8 , 16
Is a shaft, 9 is a winding, 10 is a magnetic head, 11 is a gimbal, 12 is a head arm, 14 is a carriage, 17 is a bobbin coil, and 18 is a yoke.

1 and 2, the spindle motor comprises a shaft 8, a winding 9 provided on the shaft 8, a spindle hub 5, and a magnet 6 provided on the hub 5. The shaft 8 is supported via a bearing 7 so that the outer periphery of the shaft 8 can rotate. A plurality of magnetic disks 2 are attached to the spindle hub 5 by spacers 4 and disk clamps 3. Further, the actuator rotatably rotates the shaft 16 and the outer circumference of the shaft 16.
A carriage 14, which is held by a bearing 15 on the
Bobbin coil 17 mounted on the carriage 14 and placed in the magnetic circuit of the voice coil motor, carriage 1
4, a plurality of head arms 12 attached via a spacer 13 and a gimbal 11 at the tip of the head arms 12.
The magnetic head 10 is held by the magnetic head 10. Further, the voice coil motor is a bobbin coil that constitutes a part of the actuator placed in the magnetic field of the magnetic circuit including the magnet 19, the yoke 18 and the two yoke-supporting plates 1 forming a part of the yoke. 17
Composed of and.

The shaft 8 of the spindle motor, the shaft 16 of the actuator, and the yoke 18 of the Pois coil motor are made of the same member as the yoke 18 as a part of the yoke 18 and have high rigidity.
It is supported by a single yoke / support plate 1 so as to be vertically symmetrical. With such a support structure, the spindle motor, the actuator, and the voice coil motor are integrally supported by the two highly rigid yoke / support plates 1, so that the entire magnetic disk device is made highly rigid against vibration. be able to. Further, it is easy to set the thermal expansion coefficients of the materials of the shafts 8 and 16 and the yoke support plate 1 to be the same or close to each other, thereby reducing the thermal deformation between the spindle motor, the actuator and the voice coil motor. You can Further, since the yoke / support plate 1 is a magnetic material forming a part of the yoke, the structure of the magnetic circuit of the voice coil motor can be simplified and the magnetic shield effect against the leakage magnetic flux can be improved.

As is well known, the operation of writing and reading information to and from the magnetic disk 2 in the magnetic disk device having the above-described structure is such that the magnetic head 10 held at the tip of the head arm 12 via the gimbal 11 is a spindle motor. The servo information recorded on the magnetic disk 2 which is rotationally driven by the magnetic head 1 is read by the voice coil motor, which drives the actuator based on the servo information.
This is performed by positioning 0 at a predetermined position on the magnetic disk 2.

[0012]

As described above, according to the present invention,
Improvement of rigidity of magnetic disk drive structure including spindle motor, actuator and voice coil motor, reduction of deformation due to heat, simplification of magnetic circuit of voice coil motor, improvement of magnetic shield effect, assemblability at servo track write Can be improved.

[Brief description of drawings]

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

FIG. 2 is a plan view showing the configuration of an embodiment of the present invention.

[Explanation of symbols]

1 ... Yoke and support plate, 2 ... magnetic disk, 3 ... disk clamp, 4,13 ... spacer, 5 ... spindle hub, 6,19 ... magnet, 7,15 ... bearing, 8,16 ...... Shaft, 9 ...... Winding, 10 ...... Magnetic head, 11 ...... Gimbal, 12 ...... Head arm, 1
4 ... Carriage, 17 ... Bobbin coil, 18 ... Yoke.

Front page continued (72) Inventor Hideaki Amano 2880, Kozu, Odawara-shi, Kanagawa Hitachi Ltd., Odawara Plant (72) Inventor Toshio Shiono, 2880, Kozu, Odawara, Kanagawa Hitachi Ltd., Odawara Plant (72) ) Inventor Satoru Yamaura 2880 Kozu, Odawara City, Kanagawa Stock Company Hitachi Ltd. Odawara Plant

Claims (2)

[Claims] 1. A spindle motor for rotating and driving a magnetic disk via a hub, a magnetic head for recording and reproducing information on and from the magnetic disk, a carriage for rotatably supporting the magnetic head, a magnet and a yoke. In a magnetic disk device including a voice coil motor that rotationally drives the carriage, both ends of the spindle shaft of the spindle motor are fixed, and the spindle motor rotationally drives a hub located on the outer periphery of the shaft. The carriage shaft of the carriage has a structure in which both ends of the carriage shaft are fixed and the magnetic head is rotatably supported with respect to the carriage shaft.
A pair of first support plates separated substantially vertically and a pair of first support plates for fixing the spindle shaft from above and below for holding the magnetic disk and the spindle motor, and a pair of first support plates separated substantially vertically. A second support plate, which is fixed to the carriage shaft from above and below and holds the magnetic head, the carriage, and the voice coil motor, and the first support plate and the second support plate. A magnetic disk device characterized in that it has a separate structure that can be separated from the support plate. 2. The magnetic disk device according to claim 1, wherein the second support plate also serves as a yoke of the voice coil motor.