JP2001014785A - Disk rotational drive assembly and method for assembling disk rotational drive assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix a central hole of a turn table to a fixing shaft of a spindle motor without the occurrence of eccentricity by press fitting a member insertion part of the turntable into the cylindrical fixing member having a shaft insertion part to be inserted with a revolving shaft. SOLUTION: When the revolving shaft 4 is inserted into the fixing member 8, axial projecting pats 15 abut on the revolving shaft 4 and a turn table member 7 is press fitted into the fixing member 8 in such a manner that the projecting parts 14 of the fixing member 8 and the recessed parts 13 of the turntable member 7 fit to each other. The recessed parts 13, thereafter, tighten the projecting parts 14, by which the axial projecting pats 15 of the fixing member 8 are made to press the revolving shaft 4 of the spindle motor and the fixing member 8 is fixed to the revolving shaft 4. The revolving shaft 4 is pressed and fixed at three points by the axial projecting pats 15 disposed on the inside wall of the shaft insertion part 12 and, therefore, the force exerted on the revolving shaft 4 via the axial projecting pats 15 may be more concentrated and more securely fixed than in the case the entire part of the wall of the shaft insertion part 12 presses the revolving shaft 4 and tightens and fixes the revolving shaft 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus for recording / reproducing information on / from a disk, and more particularly to a disk rotating / driving apparatus for driving the disk to rotate.

[0002]

2. Description of the Related Art In a recording / reproducing apparatus for recording / reproducing a disk, a disk rotation drive for rotating the disk mounts the disk on a turntable fixed to a spindle motor and rotates the disk.

FIG. 5 is a diagram showing a schematic configuration of a conventional disk rotation drive device. In FIG. 5A, a turntable 3 on which a disk (not shown) is mounted is integrally formed of a metal material, and a mounting portion 9 on which the disk is mounted and a center of rotation of the disk. An engagement portion 10 for arranging a disk such that the center of the rotation shaft 4 of the spindle motor 2 is provided, and an insertion hole 18 into which the rotation shaft 4 of the spindle motor 2 is inserted.

[0004] The spindle motor 2 rotatably supports a rotating shaft 4 with bearings 5 and 6. The turntable 3 has the rotary shaft 4 of the spindle motor 2 directly pressed into the insertion hole 18 and is fixed at a predetermined height.

In FIG. 5B, a spindle motor 2
The eyelet 21 provided with the shaft locking portion 19 for locking the tip of the rotary shaft 4 and the turntable locking portion 20 for locking the bottom surface of the turntable 3 is attached to the rotary shaft 4 of the spindle motor 2.
And the eyelets 21 are inserted into the fitting portions 22 of the turntable 3 and the turntable 3 is inserted into the spindle motor 2.
Is fixed to the rotating shaft 4. Such a disk rotation driving device is disclosed in, for example, Japanese Patent Application Laid-Open No. 5-120790.

In addition to the above-described configuration, there are a method of inserting the turntable into the rotation shaft of the spindle motor and fixing it with an adhesive, and a method of screwing the turntable to the rotation shaft of the spindle motor.

[0007]

However, if a turntable or an eyelet is directly pressed into the rotating shaft of the spindle motor as described above, an excessive load is applied to the bearing of the spindle motor, and the bearing is damaged or deformed. Therefore, the rotation shaft is eccentric, and the rotation of the turntable is eccentric.

When a soft member such as plastic is used for the insertion hole of the turntable or the fitting portion of the eyelet, the load applied to the bearing of the spindle motor is reduced, and the turntable can be easily mounted. The rotation shaft of the spindle motor cuts the inner wall of the insertion hole of the turntable or the fitting portion of the eyelet, causing eccentricity of the turntable.

When the turntable is fixed to the rotary shaft of the spindle motor with an adhesive, the turntable may come off the rotary shaft due to vibration or the like. In the method of screwing the turntable to the rotating shaft of the spindle motor, the screw may be loosened due to vibration or the like, and the turntable may come off from the rotating shaft.

An object of the present invention is to provide a disk rotation drive device and a turntable mounting method capable of fixing a center hole of a turntable to a rotation shaft of a spindle motor so as to prevent eccentricity of the turntable.

[0011]

According to a first aspect of the present invention, there is provided a spindle motor having a rotatable rotating shaft;
It is characterized by comprising a cylindrical fixing member provided with a shaft insertion portion for inserting a rotating shaft, and a turntable member provided with a member insertion portion for press-fitting the fixing member.

According to a second aspect of the present invention, in the disk rotation driving device according to the first aspect, the fixing member is provided on the shaft insertion portion and is provided on the outer periphery of the fixing member. And the turntable member has a concave portion that fits with the convex portion.

According to a third aspect of the present invention, there is provided a disk rotation drive assembling method for mounting a turntable member on a rotation shaft of a spindle motor via a fixing member to assemble a disk rotation drive. Arranging a turntable fixing jig that projects only the rotating shaft without abutting on the rotating shaft; inserting a fixing member into the rotating shaft until it comes into contact with the turntable fixing jig; And a step of press-fitting.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic diagram showing a schematic configuration of an embodiment of a disk rotation driving device according to the present invention. The disk rotation drive 1 includes a spindle motor 2 and a turntable 3. The spindle motor 2 includes a rotating shaft 4 and a bearing unit 5 that rotatably supports the rotating shaft 4.
And a bearing 6 that rotatably supports one end of the rotating shaft 4.

The turntable 3 has a turntable member 7 and a fixing member 8. Turntable member 7
Has a mounting portion 9 on which a disk is mounted, an engaging portion 10 inserted into a center hole of the disk, and a member insertion portion 11 into which the fixing member 8 is inserted. The fixing member 8 includes a shaft insertion portion 12 into which the rotating shaft 4 of the spindle motor 2 is inserted.

The rotating shaft 4 of the spindle motor 2 is inserted into a shaft insertion portion 12 of a fixed member 8, and the fixed member 8 is inserted into a member insertion portion 11 of the turntable member 7.

FIG. 2 is a schematic diagram for explaining a turntable and a fixing member of the disk rotation drive device of the present embodiment. As shown in FIG. 2A, the turntable member 7
A concave portion 13 is formed on the inner wall of the member insertion portion 11.

As shown in FIG. 2B, a convex portion 14 is formed on the outer wall of the fixing member 8. As shown in FIG. 2C, an axial projection 15 is formed on the inner wall of the fixing member 8. The protrusions 14 and the shaft protrusions 15 are formed on the fixing member 8 at equal intervals.

For example, when the diameter of the rotating shaft 4 of the spindle motor 2 is 2 mm, the diameter of the shaft insertion portion 12 of the fixing member 8 is 2 mm + 0.1 to 2 mm + 0.2 mm, and when the diameter of the fixing member 8 is 4 mm, The diameter of the member insertion portion 9 of the turntable member 7 is 4 mm-0.2 to 4 mm-0.3
mm.

FIG. 3 is a schematic diagram for explaining a method of fixing the turntable to the rotating shaft in the disk rotation drive device of the present embodiment. As shown in FIG.
When the rotary shaft 4 is inserted into the rotary shaft 4, the shaft protrusion 15 of the fixed member 8 comes into contact with the rotary shaft 4. The turntable member 7 is press-fitted into the fixing member 8 so that the convex portion 14 of the fixing member 8 and the concave portion 13 of the turntable member 7 fit each other. The turntable member 7 is press-fitted into the fixing member 8, and the turntable member 7
The concave portion 13 tightens the convex portion 14 of the fixing member 8, so that the shaft convex portion 15 of the fixing member 8 presses the rotating shaft 4 of the spindle motor 2, and the fixing member 8 is fixed to the rotating shaft 4.

The shaft projection 1 provided on the inner wall of the shaft insertion portion 12
5, the rotary shaft 4 is pressed and fixed at three places, so that the entire inner wall of the shaft insertion portion 12 presses the rotary shaft 4 and tightens the rotary shaft 4 to fix it. 4 is concentrated, and the fixing member 8 is firmly fixed to the rotating shaft 4.

When the concave portion 13 provided in the member inserting portion 11 of the turntable member 7 and the convex portion 14 of the fixing member 8 engage with each other, the member inserting portion 11 slides on the outer periphery of the fixing member 8 and the turntable member 7 Does not rotate around the fixing member 8.

In the present embodiment, the number of the concave portions 13 provided in the member insertion portion 11 of the turntable member 7 and the number of the convex portions 14 and the shaft convex portions 15 provided in the fixing member 8 are three, but are not limited thereto. However, the number may be three or more.

FIG. 4 is a schematic view for explaining the turntable mounting method of the present invention. In FIG. 4, the spindle motor 2 is arranged on a table 16. A turntable fixing jig 17 is arranged so as to surround the spindle motor 2. The turntable fixing jig 17 is arranged such that the upper part of the main body of the spindle motor 2 does not abut, and only the rotating shaft 4 projects from the upper surface of the turntable fixing jig 17.

The fixing member 8 is inserted into the rotating shaft 4 of the spindle motor 2. The fixing member 8 is held by the rotating shaft 4 at a position in contact with the turntable fixing jig 17.

The turntable member 7 is pressed into the fixing member 8. At this time, the force (arrow A) applied to press-fit the turntable member 7 is not directly applied to the rotating shaft 4, but is applied so that the shaft inserting portion 12 of the fixed member 8 tightens the rotating shaft 4.

A force (arrow B) applied in the length direction of the rotary shaft 4 of the spindle motor 2 is applied to the turntable fixing jig 17 via the fixing member 8. Therefore, an excessive load is not applied to the rotating shaft 4 of the spindle motor 2, and the bearing 6 of the spindle motor 2 is not deformed or damaged, and the eccentricity of the turntable does not occur.

Here, the member insertion portion 11 and the fixing member 8 of the turntable member 7 may be conical. That is, the diameter of the shaft insertion portion 12 of the fixing member 8 is slightly larger than the rotation shaft 4 of the spindle motor 2, the diameter of the upper end of the fixing member 8 is slightly smaller than the diameter of the lower end, and the diameter of the upper end of the member insertion portion 11 May be slightly smaller than the diameter of the lower end.

For example, when the diameter of the rotating shaft 4 of the spindle motor 2 is 2 mm, the diameter of the shaft insertion portion 12 of the fixing member 8 is 2 mm + 0.1 to 2 mm + 0.2 mm, and the diameter of the upper end of the fixing member 8 is 4 mm− 0.1-4mm-0.2m
m, the diameter of the lower end is 4 mm, and the turntable member 7
The diameter of the upper end of the member insertion part is 4 mm-0.2 to 4 mm-
0.3mm, bottom diameter is 4mm-0.1 ~ 4mm-
0.2 mm.

By doing so, the fixing member 8 can be relatively easily press-fitted into the member insertion portion 9 of the turntable member 7.

[0031]

According to the present invention, the bearing is mounted on the turntable without causing deformation or damage to the bearing of the rotary shaft of the spindle motor and without damaging the inner wall of the insertion hole of the turntable. The center hole of the turntable can be fixed to the rotating shaft of the spindle motor so that the disk does not become eccentric.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a schematic configuration of an embodiment of a disk rotation drive device of the present invention.

FIG. 2 is a schematic diagram for explaining a turntable and a fixing member of the disk rotation drive device of the embodiment.

FIG. 3 is a schematic diagram for explaining a method of fixing a turntable to a rotating shaft in the disk rotation drive device of the embodiment.

FIG. 4 is a schematic diagram for explaining a turntable mounting method of the present invention.

FIG. 5 is a diagram showing a schematic configuration of a conventional disk rotation drive device.

[Explanation of symbols]

1. Disk rotation drive device, 2. Spindle motor, 3. Turntable, 4. Rotary shaft, 5. Bearing part, 6. Bearing, 7. Turntable member, 8.
..Fixing members, 9 ··· Placement sections, 10 ··· Engaging sections, 11 ·
.Member insertion section, 12... Shaft insertion section, 13...
··· Protrusion, 15 ··· Shaft convex, 16 ·· Stand, 17 ··· Turntable fixing jig, 18 ··· Insertion hole, 19 ··· Shaft lock, 20 ·· Turntable lock, 21 .. Eyelets,
22. Fitting part.

Claims (3)

[Claims] 1. A turntable having a spindle motor having a rotatable rotating shaft, a cylindrical fixing member having a shaft inserting portion for inserting the rotating shaft, and a member inserting portion for press-fitting the fixing member. And a member for rotating the disk. 2. The disk rotation drive device according to claim 1, wherein the fixing member is provided on the shaft insertion portion and is in contact with the rotating shaft, and a protrusion provided on an outer periphery of the fixing member. Wherein the turntable member includes a concave portion that fits with the convex portion. 3. A method for assembling a disk rotation drive device, comprising attaching a turntable member to a rotation shaft of a spindle motor via a fixing member to assemble a disk rotation drive device.
A step of disposing a turntable fixing jig that projects only the rotating shaft without contacting the upper part of the main body of the spindle motor, and a position where the fixing member abuts on the rotating shaft to the turntable fixing jig. A method for assembling a disk rotation driving device, comprising a step of inserting and a step of press-fitting the turntable member into the fixing member.