JP3049452B2 - Hard disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin hard disk drive.

2. Description of the Related Art In recent years, many portable personal computers with a built-in hard disk drive have become commercially available. Needless to say, there is a demand for a notebook personal computer and the like to be made thinner, and it is needless to say that the hard disk device incorporated therein must be further thinned in order to meet the demand.

The present invention has been made in view of the above-mentioned problems in the prior art, and has as its object to further reduce the thickness of a hard disk device and a computer device using the same. To provide a hard disk device that can meet the demands of the above.

[0003]

In order to achieve the above object, a hard disk drive according to the present invention is provided with a stator core provided on an outer peripheral side of a rotor to which a hard disk is fixed.
A hard disk drive in which a stator coil is wound around a coil winding portion of a stator tooth of the stator core, wherein a coil winding portion of at least a part of the stator teeth is biased in a substantially circumferential direction, A space is formed between the stator core and the hard disk where the magnetic head and the magnetic head supporting means can move due to the absence of the stator coil.

[0004]

Since the stator core is provided on the outer peripheral side of the rotor to which the hard disk is fixed, the magnetic head and the magnetic head supporting means move between the stator core and the hard disk.

However, when the coil winding portion of at least a part of the stator teeth of the stator core is displaced substantially in the circumferential direction, the stator coil is prevented from being present between the stator core and the hard disk over a required range. be able to.

Accordingly, by forming a space between the stator core and the hard disk in which the magnetic head and the magnetic head supporting means can move due to the absence of the stator coil, the thickness of the hard disk device is substantially equivalent to the winding thickness of the stator coil. As a result, the thickness can be reduced.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIGS. 1 and 2 relate to a hard disk drive as an embodiment of the present invention. FIG.
FIG. 2 is a sectional view taken along line -QRSTTI, and FIG.
FIG. 2 is a sectional view taken along line II-OP-II.

Reference numeral 10 denotes a hard disk device base. A cylindrical bearing housing 14 of a spindle motor 12 for driving a hard disk is protrudingly provided at the left center portion of the base 10 in FIG. Reference numeral 16 denotes a rotor hub. The rotor hub 16 is substantially cup-shaped, and has a rotating shaft 20 protruding from a central portion inside the peripheral wall 18.
The rotating shaft 20 is rotatably supported inside the bearing housing 14 via two ball bearings 22.

A peripheral wall 18 of the rotor hub 16 is located on the outer peripheral side of the bearing housing 14, and an annular rotor magnet 24 is disposed on an outer peripheral side of an opening (lower end in FIG. 2) of the peripheral wall 18.
Are arranged. As shown in FIG. 2, the lower end portions of the rotor magnet 24 and the peripheral wall 18 are inserted into an annular concave portion 26 provided on the outer periphery of the base of the bearing housing 14 in the base 10. The rotor 28 is mainly composed of the rotor magnet 24 and the rotor hub 16.

A hard disk 30 is fitted on the base (upper end in FIG. 2) of the peripheral wall 18 of the rotor hub 16. Reference numeral 32 denotes a disc spring-like washer which is fitted on the base (the upper end in FIG. 2) of the rotor hub 16 and is located on the inner periphery of the hard disk 30. Hard disk 30
Is fixed by a fixing annular member 34 via the washer 32. The inner periphery of the fixing annular member 34 is formed in a female screw portion, and is screwed to the outer periphery of the base portion of the rotor hub 16 formed in the male screw portion.

FIG. 3 is a plan view of the washer 32, and FIG. 4 is an end view taken along the line IV-IV in FIG. Inward protrusions 36 are provided at three locations on the inner periphery of the washer 32. The inward protrusion 36 is fitted into a concave portion 38 provided on the outer peripheral portion of the base of the rotor hub 16, and the washer 32 is screwed with the fixing annular member 34 when the fixing annular member 34 is screwed to the base of the rotor hub 16.
Is prevented from rotating.

As described above, the hard disk 30 is pressed against the rotor hub 16 over the entire inner periphery of the hard disk 30 via the disc spring-shaped washer 32 provided with the rotation preventing function. The clamping force is applied substantially evenly over the entire inner peripheral portion, thereby preventing the disk from being warped or the like.
And the generation of dust and the like due to the damage.

Reference numeral 40 denotes a stator core fixed to the base 10. The stator core 40 has a yoke portion 42 extending over the entire circumference on its outer peripheral portion, and nine stator teeth 51 to 59 project from the inner peripheral side of the yoke portion 42. The inner peripheral portions 51a to 59a of the stator teeth 51 to 59 are located radially outward of the rotor magnet 24 and face the rotor magnet 24 in the radial direction. As shown in FIG. 2, the inner peripheral portions 51a to 59a of the stator teeth 51 to 59 are fixed in contact with the upper surface of the base 10 so as to be opposed to the rotor magnet 24. The centers are matched. The stator teeth 51 to 59 are
It is bent upward in FIG. 2 slightly outside of 1 a to 59 a, and its height is maintained up to the yoke portion 42. This is for accommodating the stator coil 60 wound around the base of the stator teeth 51 to 59, that is, the coil winding portions 51b to 59b. The lower portion of the stator coil 60 is provided with a coil housing recess 62 provided on the base 10.
Has been inserted.

The inner peripheral portions 51a to 59a of the stator teeth 51 to 59 have substantially the same length in the circumferential direction (about 33 degrees at the center angle from the rotation axis of the spindle motor 12), and have a constant circumference. Although they are arranged approximately nine times rotationally symmetrically, the coil winding portions 51b to 55b and 59b
Are substantially deviated in the circumferential direction around a movable range (upper right portion in FIG. 1) of a magnetic head 64 described later and a support arm 66 supporting the magnetic head 64. Magnetic head 64 and support arm 66
The stator coil 60 does not exist between the stator core 40 and the hard disk 30 in the movable range of
This is to form a space in which the magnetic head 64 and the support arm 66 can move. With the above-described configuration of the inner peripheral portions 51a to 59a of the stator teeth 51 to 59, the magnetic relationship with the rotor magnet 24 is determined as a whole when the coil winding portions 51b to 55b and 59b are not biased. Almost equivalent.

[0015] The deviation of the coil winding portion in the substantially circumferential direction is as follows.
The following can be seen from the deviation of the angle of the stator teeth from the inner peripheral portion. However, the angle referred to here is an angle formed by each central position of the coil winding portion and the inner peripheral portion when viewed from the rotation axis of the spindle motor 12.

The inner peripheral portions 56a to 58a and the coil winding portions 56b to 58b of the stator teeth 56 to 58 are located in the same radial direction, and there is substantially no displacement.

The coil winding portion 52b of the stator teeth 52
It is deviated about 43 degrees clockwise in FIG. 1 with respect to the inner peripheral portion 52a. Further, the coil winding portion 51b of the stator tooth 51
Is deviated approximately 23 degrees counterclockwise with respect to the inner peripheral portion 51a. The coil winding portion 53b of the stator teeth 53 is approximately 33 degrees clockwise with respect to the inner peripheral portion 53a, and the coil winding portion 54b of the stator teeth 54 is approximately 24 degrees clockwise with respect to the inner peripheral portion 54a. The coil winding portion 55b of the 55 is approximately 10 degrees clockwise with respect to the inner peripheral portion 55a, and the coil winding portion 59b of the stator tooth 59 is approximately 10 degrees counterclockwise with respect to the inner peripheral portion 59a. Biased.

In FIG. 2, reference numeral 68 denotes a magnetic shield member for preventing the magnetic influence of the stator from affecting the hard disk 30 and the magnetic head 64, and extends from the outer peripheral portion to the inner peripheral portion of the stator core 40. It is provided so as to be separated from the hard disk 30.

Next, the upper half in FIG. 2 of the laminated electromagnetic steel sheets constituting the stator core 40 is bent and located slightly above and extends in the lower right direction in FIG. 1 to provide a voice coil for driving the magnetic head. Lower yoke 72 of motor 70
Is composed. As described above, the stator core 40 of the spindle motor 12 for driving the hard disk and the lower yoke 72 of the voice coil motor 70 for driving the magnetic head are integrally formed, thereby positioning the voice coil motor 70 with respect to the spindle motor 12. As a result, the positioning of the magnetic head 64 with respect to the hard disk 30 is further ensured.

Reference numeral 74 denotes a support standing upright on the base 10, 76
Is a rotary sleeve member rotatably supported on the support 74 via a ball bearing (not shown). The support arm 66 protrudes outward in the radial direction of the rotary sleeve member 76, and the magnetic head 64 is supported at the tip of the support arm 66. A movable coil 78 is fixed to the rotating sleeve member 76 on the side opposite to the support arm 66.

Reference numeral 80 denotes an upper yoke fixed above the support column 74, and reference numerals 82 and 84 denote lower surfaces of the upper yoke and the lower yoke 7.
2 are substantially fan-shaped permanent magnet plates fixed to the upper surface of each pair. The movable coil 78 is located between the upper and lower permanent magnet plates 82 and 84.

When the movable coil 78 is excited and rotates about the rotation axis of the rotary sleeve member 76, the magnetic head 64 is driven in the direction indicated by the arrow in FIG. Move along. Since the stator coil 60 does not exist between the stator core 40 and the hard disk 30 in the movable range of the magnetic head 64 and the support arm 66, the thickness of the entire hard disk 30 device is reduced by an amount substantially corresponding to the winding thickness of the stator coil 60. ing.

Further, since the base 10 also serves as the frame of the spindle motor 12, further thinning is realized.

If the coil accommodating recess is made deeper while ensuring sufficient strength and rigidity of the base and the entire lower portion of the stator coil can be accommodated in the coil accommodating recess, the stator teeth of the stator core 40 can be accommodated. It is not necessary to bend the upper portions 51 to 59 slightly outside the inner peripheral portions 51a to 59a, and the entire hard disk can be further thinned by lowering the hard disk mounting position. 86 is a lid for sealing the disk chamber.

[0025]

According to the hard disk drive of the present invention, the thickness can be reduced by an amount substantially corresponding to the winding thickness of the stator coil. Can also respond to the demand for

[Brief description of the drawings]

FIG. 1 is a cross-sectional view taken along line IQRSTI of FIG.

FIG. 2 is a sectional view taken along line II-OP-II in FIG.

FIG. 3 is a plan view of the washer 32. FIG.

FIG. 4 is an end view taken along line IV-IV in FIG. 3;

[Description of sign]

 Reference Signs List 28 rotor 30 hard disk 40 stator core 51 stator teeth 51b coil winding part 52 stator teeth 52b coil winding part 53 stator teeth 53b coil winding part 54 stator teeth 54b coil winding part 55 stator teeth 55b coil winding part 56 stator teeth 56b Coil wound part 57 Stator tooth 57b Coil wound part 58 Stator tooth 58b Coil wound part 59 Stator tooth 60 Stator coil 64 Magnetic head 66 Support arm

Claims (1)

(57) [Claims] 1. A hard disk drive comprising a stator core provided on an outer peripheral side of a rotor to which a hard disk is fixed, and a stator coil wound around a coil winding portion of the stator teeth of the stator core. A space in which the magnetic head and the magnetic head supporting means can move due to the absence of the stator coil is formed between the stator core and the hard disk by displacing the coil winding portion of at least a part in the substantially circumferential direction. A hard disk device characterized by the above-mentioned.