JPH05101525A - Recording disk driving device - Google Patents

Abstract

(57) [Summary] [Purpose] To make the entire device thinner by making the clamping pressure to hold the recording disk even in the circumferential direction. The runnable area of the magnetic head is brought closer to the inner peripheral edge while suppressing the height of the spindle motor. [Structure] The recording disk 58 is brought into contact with the disk contact surface 44, and the inward projection 62 of the disc spring washer member 60 is fitted into the groove-shaped recess 40 to be externally fitted to the base portion 28. When the fixing annular member 64 is screwed onto the male screw portion 38, the washer member 60 does not rotate with respect to the rotor hub 26. The recording disk 58 is evenly pressed in the circumferential direction without damage. Upward protrusion 24
The lower surface of the second annular flat plate portion 48 is configured to be lower than the lower surface of the first annular flat plate portion 42 by an amount substantially corresponding to the height of a to form a gap portion 66 in which the magnetic head 50 can travel. The height of the spindle motor 12 is suppressed, and a sufficient area where the magnetic head 50 can travel is secured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording disk drive device in which a recording disk is fixed to a rotor of a spindle motor.

[0002]

2. Description of the Related Art When a recording disk such as a hard disk is fixed to a rotor of a spindle motor, a clamp member is screwed to the rotor by using a plurality of screw holes provided on a constant circumference of the rotor. Mostly by doing.

However, when the screwing force is not uniform,
The clamping pressure for holding the recording disk fixed may be unbalanced in the circumferential direction, so that the recording disk may be warped. In addition, since a space for providing a screw hole in the rotor is required, it constitutes one of the factors that hinders the reduction of the thickness of the spindle motor and the entire device.

Further, particularly in the case of a recording disk having a small diameter, the outer diameter of the rotor of the spindle motor is often larger than the inner diameter of the recording area, and the area in which the magnetic head can travel is larger than the outer diameter of the rotor. If the inner side is not provided, the recording surface of the recording disk cannot be fully utilized.

However, for that purpose, it is necessary to provide a gap between the rotor and the recording disk in which the magnetic head can run, which is one of the factors that hinder the reduction of the thickness of the recording disk drive device.

The present invention has been made in view of the above-mentioned problems existing in the prior art. The object of the present invention is that the clamping force for fixing and holding the recording disk is not constant in the circumferential direction. A recording disk drive device capable of preventing the recording disk from warping due to the balance, and thinning the structure for fixing and holding the recording disk as much as possible to reduce the overall thickness of the drive device, and a spindle motor. By driving the area where the magnetic head can move closer to the inner peripheral edge of the recording disk while keeping the height of the recording disk as low as possible, the recording surface of the recording disk can be used sufficiently widely and the device can be made thinner. To provide a device.

[0007]

In order to achieve the above object, a recording disk drive apparatus of the present invention is a recording disk drive apparatus in which a recording disk is fixed to a rotor of a spindle motor, and the recording disk drive apparatus has an inner peripheral portion. The rotor is provided with a disc spring-shaped washer member having an inward protrusion, and a fixing annular member having a female screw portion on the inner peripheral portion thereof. An inner surface of the inner peripheral portion of the disk, and an outer surface of the fitting portion, and an inner concave portion and the fixing annular portion that are fitted to the inner protruding portion of the washer member. A recording disk that has a male screw portion that is screwed with a member on the outer peripheral portion and is externally fitted to the fitting portion with one surface in contact with the contact surface Via the washer member located on the other surface side of the It is assumed that the clamping fixed between the abutment surface by use annular member.

Further, in the recording disk drive device of the present invention, the rotating shaft of the rotor is rotatably supported inside the bearing-holding cylindrical portion provided on the base, and the outer peripheral portion of the base portion of the cylindrical portion is rotatably supported. A recording disk drive device in which a stator core having a winding wound therein is provided, and a recording disk is fixed to the rotor in a spindle motor in which a field means that faces the stator core on the radial outer peripheral side is provided in the rotor. On the outer circumference side of the winding, the height of the winding projecting from the stator core to the recording disk side is almost equal to the height of the base side of the rotor, so that the base side of the rotor is a constant surface of the base side rather than the inner side. By being configured lower than
Between the surface of the recording disk on the base side and the surface of the rotor on the recording disk side, there is provided a gap through which the magnetic head can travel. Inside the gap, an inner peripheral portion of the recording disc is provided. It is assumed that the rotor has a contact surface with which the surface on the base side contacts.

[0009]

According to the first aspect of the present invention, the recording disk is externally fitted to the fitting portion of the rotor, and one surface of the inner peripheral portion of the driven disk is brought into contact with the contact surface of the rotor. After the washer member is externally fitted to the fitting portion while fitting the side projection to the inner concave portion, and the fixing annular member is screwed into the male screw portion of the fitting portion, the recording disk is inserted through the washer member. Is clamped between the contact surface and the contact surface.

Since the inward projection of the washer member is fitted in the inward recess, the washer member is prevented from rotating with respect to the rotor when the fixing annular member is screwed. In addition, since the recording disk is clamped between the contact surface and the entire inner circumference of the recording disk through the disc spring washer member, the entire inner circumference of the recording disk is covered. Since the nipping force is applied almost evenly, it is possible to prevent warping of the recording disk due to the imbalance of the nipping pressure, and also to prevent the recording disk from being damaged during fixing.

According to another aspect of the present invention, the magnetic head is provided between the rotor and the recording disk on the outer peripheral side of the portion where the base side surface of the inner peripheral portion of the recording disk abuts against the abutment surface and is fixedly held. When providing a gap that can run
On the outer peripheral side of the winding, the height of the winding protruding from the stator core to the side of the recording disk is almost equivalent to the height of the base of the rotor. It is configured to be low. for that reason,
While keeping the height of the spindle motor as low as possible, the area where the magnetic head can travel can be brought close to the inner peripheral edge of the recording disk.

[0012]

Embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a recording disk drive device 1 according to the present invention.
FIG. 1 is a half cross-sectional view of a main part of a recording disk drive device, and FIG. 2 is a plan view of the main part of the embodiment.

Reference numeral 10 is a base of the recording disk drive, and also serves as a stator frame of a spindle motor 12 for driving a recording disk such as a hard disk. A cylindrical portion 14 for holding a bearing is integrally projectingly provided on the base 10, and a first annular recess 16 is provided on the outer peripheral portion of the base end of the cylindrical portion 14 of the base 10. Further, the outer peripheral portion of the first annular concave portion 16 of the base 10 is an annular protrusion 18
The outer peripheral portion of the annular protrusion 18 is formed by the second
It is formed in the annular recess 20.

A stator core 22 is externally fitted to the base end of the cylindrical portion 14, and the stator core 22 is fixed with the lower surface of the outer peripheral portion of the stator core 22 in FIG. 1 abutting on the upper surface of the annular projection 18. .. The stator coil 24 is wound around the slot of the stator core 22, and the downward protruding portion 24 a of the wound stator coil 24 is housed in the first annular recess 16.

Reference numeral 26 is a rotor hub having a bowl shape.
At the center of the base portion 28 of the rotor hub 26, a rotary shaft 30 is provided so as to extend inwardly of the rotor hub 26. The rotary shaft 30 is vertically arranged inside the cylindrical portion 14. It is rotatably supported via a ball bearing 32 and a second ball bearing 34. The lower end opening of the cylindrical portion 14 is sealed by a seal member 36.

A male screw portion 38 is formed in an upper portion of the outer peripheral portion of the base portion 28 of the rotor hub 26, and a lower portion thereof is formed as an enlarged diameter portion 39 having a slightly enlarged diameter. Further, groove-shaped recesses 40 (inward recesses) in the axial direction of the semicircular cross section are provided across the male screw portion 38 at three locations at every 120-degree center angle of the male screw portion 38. On the outside of the male screw portion 38, which is slightly below, the base 10 is perpendicular to the rotation axis.
A first annular flat plate portion 42 that is parallel to the base plate 10. The surface of the first annular flat plate portion 42 opposite to the base plate 10, that is, the upper surface in FIG. The lower surface of the first annular flat plate portion 42 is located slightly above the upper protruding portion 24b of the stator coil 24. The outer diameters of the first annular flat plate portion 42 and the disk contact surface 44 are smaller than the outer diameter of the stator core 22.

The outer peripheral portion of the first annular flat plate portion 42 is connected to the second annular flat plate portion 48 located slightly downward and outward through the falling portion 46. The inner diameter of the falling portion 46 is
The stator coil 24 is located slightly outward of the upper protruding portion 24b.

The lower surface of the second annular flat plate portion 48 is higher than the lower surface of the first annular flat plate portion 42 by which the stator coil 24 projects above the stator core 22, that is, the upper projecting portion 2
It is low by almost the height of 4b. The lower surface of the second annular flat plate portion 48 has an upper protruding portion 24 b of the stator coil 24.
It is located slightly lower than the upper surface and is located slightly higher than the upper surface of the stator core 22. The upper surface of the second annular flat plate portion 48 is located below the lower surface of the first annular flat plate portion 42, and the magnetic head 50 can travel between the disk contact surface 44 and the upper surface of the second annular flat plate portion 48. It is composed of various heights.

A cylindrical hanging portion 52 is provided below the outer peripheral portion of the second annular flat plate portion 48, a cylindrical rotor yoke 54 is fixed to the inner peripheral surface thereof, and a cylindrical rotor yoke 54 is formed on the inner peripheral surface thereof. The rotor magnet 56 is fixed. The rotor magnet 56 faces the stator core 22 with a radial gap therebetween. Cylindrical part 14, rotor yoke 5
4 and the lower ends of the rotor magnets 56 are inserted into the second annular recess 20. The rotor hub 26, the rotor yoke 54, and the rotor magnet 56 form a rotor.

The recording disk 58 is externally fitted to the base portion 28 of the rotor hub 26, and the lower surface of the inner peripheral portion of the recording disk 58 is in contact with the disk contact surface 44. 60 is a washer member. 3 is a plan view of the washer member 60, and FIG. 4 is an end view taken along line IV-IV in FIG.

The washer member 60 has a disc spring shape, and has a semicircular inward projection 6 that fits in a groove-shaped recess 40 provided on the outer peripheral portion of the base portion 28 of the rotor hub 26 on the inner peripheral portion.
Have two. A washer member 60 is externally fitted to the base portion 28 of the rotor hub 26 on the upper side of the recording disk 58 with the inward projection 62 fitted in the groove-shaped recess 40, and a nut is attached to the male screw portion 38 on the upper side of the washer member 60. The washer member 60 is pressed by screwing the fixing annular member 64, and through the washer member 60,
The inner peripheral portion of the recording disk 58 is clamped and fixed between it and the disk contact surface 44. The shapes and the like of the inward projection 62 and the groove-shaped recess 40 can of course be appropriately selected.

Since the inward projection 62 of the washer member 60 is fitted in the groove-shaped recess 40, when the fixing annular member 64 is screwed into the male screw portion 38, the washer member 6 is moved accordingly.
0 is prevented from rotating with respect to the rotor hub 26.
The recording disk 58 is clamped between the disk contact surface 44 and the disk contact surface 44 through the disk spring-shaped washer member 60. Since the clamping force is applied almost evenly over the circumference, warping of the recording disk 58 due to imbalance of the clamping pressure is prevented, and the recording disk 58 is prevented from being damaged during fixing. Be done.

Further, the lower surface of the second annular flat plate portion 48 of the rotor hub 26, which is substantially equivalent to the height of the upper protruding portion 24b of the stator coil 24, is inwardly located on the base side, that is, the first annular flat plate portion. By configuring the magnetic head 5 to be lower than the lower surface of the magnetic disk 5, the magnetic head 5 is provided between the lower surface of the recording disk 58 and the upper surface of the second annular flat plate portion 48 of the rotor hub 26.
Since the void portion 66 in which 0 can travel is formed, the height of the spindle motor 12 is suppressed as low as possible and a sufficient area in which the magnetic head 50 can travel is secured.

[0024]

According to the recording disk drive device of the present invention,
Since the recording disk can be fixed by screwing the fixing annular member into the male screw portion of the fitting portion, the space for providing the screw hole for fixing the clamp member can be omitted, and the spindle motor and the entire device can be saved. Can be thinned. Also, since the recording disk is clamped between the contact surface and the entire circumference of the inner circumference of the disk spring-shaped washer member with the rotation prevention, the inner circumference of the recording disk is reduced. The clamping force is applied almost uniformly over the entire circumference of the portion, and it is prevented that the recording disc is warped due to the imbalance of the clamping pressure. Further, when the fixing annular member is screwed, the washer member and the recording disc are Since no rubbing occurs between them, it is possible to prevent damage to the recording disk and generation of dust due to the damage.

According to another aspect of the present invention, there is provided a recording disk drive device, in which the area in which the magnetic head can travel can be brought close to the inner peripheral edge of the recording disk while the height of the spindle motor is kept as low as possible. It can be used widely enough and the recording disk drive device can be made thin, so that it can be suitably used for recording disks of small diameter.

[Brief description of drawings]

FIG. 1 is a half sectional view of a main part of a recording disk drive device.

FIG. 2 is a plan view of a main part.

FIG. 3 is a plan view of a washer member.

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

[Explanation of sign]

 10 Base 12 Spindle Motor 14 Cylindrical Part 22 Stator Core 24 Stator Coil 24b Upward Projection 26 Rotor Hub 30 Rotating Shaft 38 Male Screw Part 39 Expanding Part 40 Groove Recess 44 Disk Contact Surface 50 Magnetic Head 54 Rotor Yoke 56 Rotor Magnet 58 Recording Disc 60 Washer member 62 Inner protrusion 64 Fixed annular member 66 Gap

Claims (2)

[Claims] 1. A recording disk drive device comprising a rotor of a spindle motor and a recording disk fixed to the rotor, the disk spring-like washer member having an inward projection on the inner peripheral portion, and a female screw portion on the inner peripheral portion. And a fixing annular member having
The rotor has a fitting portion on which the recording disk is fitted, and a contact surface with which one surface of the inner peripheral portion of the recording disk abuts, and the washer member is provided on the outer peripheral portion of the fitting portion. Has an inward concave portion that fits with the inward protruding portion and a male screw portion that is screwed with the fixing annular member on the outer peripheral portion, and is externally attached to the fitting portion with one surface in contact with the contact surface. The inserted recording disc is
Through a washer member that is externally fitted to the fitting portion and located on the other surface side of the recording disk, it is pinched and fixed between the male screw portion and the abutment surface by a fixing annular member. Characteristic recording disk drive device. 2. A rotating shaft of a rotor is rotatably supported inside a bearing-holding tubular portion projecting from a base, and a winding is wound around an outer peripheral portion of a base portion of the tubular portion. A recording disk drive device in which a stator core is provided, and a recording disk is fixed to the rotor in a spindle motor in which a field means that faces the stator core on the outer circumferential side in the radial direction is provided on the rotor. On the outer peripheral side, the rotor's base side is lower than the inner side of the rotor by a distance corresponding to the height of the winding protruding from the stator core to the recording disk side. Between the base-side surface of the recording disk and the recording-disk-side surface of the rotor, there is provided a gap in which the magnetic head can travel, and the gap of the recording disc is located inside the gap. Recording disk recording apparatus abutment surface plane of the base side abuts the peripheral portion is characterized in that provided in the rotor.