JP2792484B2 - Rotary access type magnetic disk drive - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle motor loaded with a plurality of magnetic disks capable of writing and reading a large amount of information, and a method of writing and reading information on and from the magnetic disks. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive comprising a rotary access type actuator for moving and positioning a plurality of magnetic heads, and more particularly to a rotary access type magnetic disk having a support structure capable of improving the rigidity of a structure and a magnetic shielding effect. Related to the device. 2. Description of the Related Art As a conventional technique relating to this kind of magnetic disk drive, there are known techniques described in, for example, Japanese Utility Model Laid-Open No. 60-64463 and Japanese Utility Model Laid-Open No. 60-64468. In these prior arts, 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 drive. [0003] In the prior art, the shaft of the spindle motor and the shaft of the actuator must be rotatably supported on a base member. Improvement of the rigidity of the entire magnetic disk drive for preventing vibrations generated by members such as an access type actuator and a voice coil motor driving the actuator, and a difference in a coefficient of thermal expansion due to a difference in material between these members and a base member Insufficient consideration is given to the prevention of thermal deformation caused by vibration, and there is a problem of generation of vibration and thermal deformation.The simplification of the magnetic circuit of the voice coil motor, and the voice coil motor and spindle Lack of consideration for prevention of magnetic flux leakage from motor There is a point. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and to have high rigidity against vibration from a power generation source, prevent thermal deformation and prevent leakage magnetic flux, and thereby achieve a high magnetic shielding effect. An object of the present invention is to provide a rotating access type magnetic disk device having a structure. According to the present invention, an object of the present invention is to use a spindle motor rotating around the outer periphery of a non-rotating shaft and a rotary actuator rotating around the outer periphery of a non-rotating shaft. This is achieved by connecting the yoke of the voice coil motor and the yoke of the voice coil motor by connecting two yoke / support plates, which are part of the yoke, with the same material as that of the yoke up and down. [0006] The two yoke and support plates, which are part of the yoke of the voice coil motor, provide a spindle motor shaft that rotates around the non-rotating shaft and a rotary actuator that rotates around the non-rotating shaft. The spindle motor, the actuator, and the voice coil motor, wherein the structure that vertically connects and supports the shaft and the yoke of the voice coil motor that drives the actuator is a power source, a vibration source, and has a dissimilar metal connection. It becomes the structure which unified the three. Since the two yoke and support plates form a part of the yoke of the voice coil motor and are made of the same material as the yoke, the rigidity is higher than the members constituting the spindle motor and the actuator. The actuator and the actuator are integrally supported by the yoke and support plate from above and below, so that the structure has high rigidity against vibration. In addition, 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 relative inclination between the two can be eliminated by restraining, and 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 drive and the rotating system and the access system can be separated from each other, so that operations such as writing servo tracks can be performed separately from the base of the magnetic disk drive. Thus, the assemblability can be improved. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the rotary access type magnetic disk drive according to the present invention will be described below in detail 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 ramp, 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. It is supported on a shaft 8 via a bearing 7, and is configured to be able to rotate around the outer periphery of the shaft 8. A plurality of magnetic disks 2 are mounted on the spindle hub 5 by spacers 4 and disk clamps 3. In addition, the actuator is configured to be rotatable around the shaft 16 and the outer periphery of the shaft 16.
A carriage 14 held through bearings 15
The bobbin coil 17 mounted on the carriage 14 and placed in the magnetic circuit of the voice coil motor, the carriage 1
4, a plurality of head arms 12 attached via a spacer 13 and a gimbal 11
, And is constituted by a magnetic head 10 held via the Further, the voice coil motor has a magnetic circuit including a magnet 19, a yoke 18, and two yoke / support plates 1 forming a part of the yoke, and a bobbin coil forming a part of the actuator placed in a magnetic field of the magnetic circuit. 17
It is composed of The shaft 8 of the spindle motor, the shaft 16 of the actuator, and the yoke 18 of the Pois coil motor have high rigidity, both ends of which are made of the same member as the yoke 18 as a part of the yoke 18.
It is supported by the two yoke / support plates 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 has high rigidity 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 thermal deformation among the spindle motor, the actuator and the voice coil motor. Can be. Furthermore, since the yoke / support plate 1 is a magnetic material constituting a part of the yoke, the configuration of the magnetic circuit of the voice coil motor can be simplified and the magnetic shielding effect against leakage magnetic flux can be improved. As is well known, the operation of writing and reading information on and from the magnetic disk 2 in the magnetic disk device having the above-described structure is performed by a magnetic head 10 held at the tip of a head arm 12 via a gimbal 11 by a spindle motor. The servo information recorded on the magnetic disk 2 which is rotationally driven is read, and the voice coil motor drives the actuator based on the servo information, and the magnetic head 1
0 is positioned at a predetermined position on the magnetic disk 2. 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 shielding effect, ease of assembly during servo track writing Can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a configuration of an embodiment of the present invention. FIG. 2 is a plan view showing the configuration of one embodiment of the present invention. [Description of Signs] 1 ... Yoke / 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.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideaki Amano 2880 Kozuhara, Hitachi, Ltd.Odawara City, Kanagawa Prefecture Inside (72) Inventor Toshio Shiono 2880 Kozu, Kozu, Odawara City, Kanagawa Prefecture Inside Odawara Factory, Hitachi, Ltd. 72) Inventor Satoru Yamaura 2880 Kozu, Odawara City, Kanagawa Prefecture Inside the Odawara Plant, Hitachi, Ltd. (56) References JP-A-63-124286 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB Name) G11B 25/04

Claims (1)

(57) [Claims] A spindle motor that rotates the magnetic disk via a hub, a magnetic head that records and reproduces information on the magnetic disk, a carriage that rotatably supports the magnetic head, a magnet and a yoke, and rotates the carriage. A magnetic disk drive having a voice coil motor to be driven, wherein a spindle shaft of the spindle motor is fixed at both ends, and the spindle motor is configured to rotationally drive a hub located on an outer periphery of the shaft; the carriage shaft is fixed to both ends, the magnetic head has a structure for rotatably supported with respect to said carriage shaft, a pair of support plates which are separated vertically substantially symmetric, the spindle
And the carriage shaft are fixed from above and below
By doing so, the magnetic disk and the spindle motor
Data, the magnetic head, the carriage, and the voice.
A support plate for holding a coil motor, the support plate ,
The spindle shaft and the carriage shaft;
There, a magnetic disk device which is a different structure separable. 2. Patent magnetic disk drive range first claim of claim, the magnetic disk device is a base member before Ki支 lifting plate also serves as a yoke of the voice coil motor.