JPH08106713A - Apparatus for driving recording disc - Google Patents

Abstract

PURPOSE: To easily and accurately assemble a driving unit to an upper and a lower base members without requiring jigs and tools, etc., and without requiring work for positioning or the like an adjustment operation. CONSTITUTION: This is a recording disc-driving apparatus having both end parts of a shaft 1 fixed to upper and lower base members 3, 4. A yoke 5 extending in a radial direction is provided in the shaft 1, and a flat, part 6 is formed at the yoke 5. A projecting part 7 projecting towards a disc-housing space 41 is formed in the lower base member 4. When the shaft 1 is fitted to the upper and lower base members 3, 4, the flat part 6 of the yoke 5 butts against the projecting part 7 of the lower base member 4, so that the shaft 1 is positioned as required.

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 for rotationally driving a recording disk such as an optical / magnetic disk.

[0002]

2. Description of the Related Art As a recording disk drive device for rotationally driving a recording disk such as an optical / magnetic disk, there is known one having a structure shown in FIG. 7, for example. FIG. 7 is a schematic configuration diagram of the disk drive device, and shows steps (a) to (c) for attaching the hub member, on which the disk is mounted, into the disk storage space. This drive device includes a hub 302 to which a disc (not shown) is rotatably driven, a fixed shaft 301 that rotatably supports the hub 302, and an upper and lower base member 309 that accommodates these and defines a disc storage space 315. And 310.

A disk (not shown) is, for example, in the shape of a donut having a center portion formed therein, and the outer peripheral portion 308 of the hub 302.
It is externally fitted and mounted on and is received by the collar portion 307. Then, the disc is tightly held and fixed to the hub 302 by a well-known clamp means. Further, a flexible circuit board 304 for supplying power to driving means (for example, armature coil, rotation detection, etc.) in the hub 302 is attached to the bracket 303. The bracket 3
03 is formed integrally with the fixed shaft 301.

As shown in FIG. 7, the fixed shaft 3
The upper and lower end portions 305 and 306 of 01 are different from the upper and lower base members 309 and 310 respectively corresponding to the screw 31.
3, 314, the holes 311 and 312 are fixed. When the fixed shaft 301 that rotatably supports the hub 302 is fixed to the upper and lower base members 309 and 310, the following procedure is usually performed. First, Fig. 7
As shown in FIG. 7B, the drive unit such as the hub / fixed shaft 301 shown in FIG.
It is inserted into the disk accommodation space 315 defined by 310.

The upper and lower end portions 305 of the fixed shaft 301,
306 correspond to the holes 311 and 312, respectively, and a pin-shaped member or a screw is applied to one of the holes (305 or 306). While maintaining this state, the flexible circuit board 304 is rotated in the circumferential direction and positioned in a predetermined manner. Then, a hole (30
6 or 305) to fix the fixed shaft end with screws (314 or 313). Continue to screw in the addressed holes. (State of FIG. 7 (c))

[0006]

However, in the disk drive device having the above-mentioned structure, recently,
In a situation where the size and weight of the device is being reduced more and more, such mounting work becomes difficult and complicated.
In particular, a jig and tool is required to apply the fixed shaft 301 to the base member, and the use of the jig and tool itself is restricted as the drive device is downsized. In addition, when it is necessary to position the flexible circuit board 304 and the like in the circumferential direction, the number of man-hours is further increased, which is a major factor for increasing the manufacturing cost. In addition, in order to perform accurate positioning, it often took time to make the adjustment. As described above, when the drive unit is attached to the base member, some improvement measures have been desired for reducing the number of attachment steps.

The present invention has been made in view of the above problems existing in the prior art, and the problem is that it does not require a jig or the like, and the drive unit can be easily moved up and down. It is an object of the present invention to provide a recording disk drive device that can be incorporated in a base member and can be mounted with high precision without requiring work such as positioning or adjustment.

[0008]

In order to achieve the above object, a recording disk drive device of the present invention comprises a fixed column, a hub member on which a recording disk is mounted, and which is rotatably supported with respect to the fixed column. The hub includes a driving means for driving the hub member to rotate relative to the fixed column, and upper and lower base members that define a disk storage space and are disposed substantially parallel to each other. In a recording disk drive device in which both ends are fixed to the upper and lower base members; the fixed column is provided with a collar-shaped portion extending outward in the radial direction, and the collar-shaped portion is arranged in the axial direction of the fixed column. On the other hand, a flat portion defined by a substantially vertical straight line is provided, and at least one side of the upper and lower base members is provided with a projecting portion that projects into the disc housing space. When the fixed strut is mounted on the upper and lower base members, the fixed strut is positioned with respect to the upper and lower base members in a predetermined manner by contacting the flat portion of the collar-shaped portion with the protrusion. It is a thing.
The collar-shaped portion is preferably a holding plate that holds the flexible circuit board. Further, it is preferable that the collar-shaped portion is a labyrinth seal member that substantially seals between the drive means side and the disk storage space side.

[0009]

According to the disk drive device of the present invention, when the fixed column is to be attached to the upper and lower base members, the flat portion of the collar-shaped portion provided on the fixed column is at least one of the upper and lower base members corresponding thereto. It abuts the protrusion provided on the crab. The flat part of the fixed column and the protruding part of the base member
It is provided so that a predetermined positioning is performed when the two come into contact with each other. Therefore, in other words, when trying to fix the fixed column to the upper and lower base members, if the fixed column is operated so as to contact the base member, the fixed column is easily moved relative to the upper and lower base members in the movement. Is positioned. Thus, in this state, if screwing or the like is performed to the fixed support via the base member, the fixed shaft can be easily attached and fixed to the base member without the fixed shaft being placed as in the conventional case.

In addition to the positioning of the fixed column and the upper and lower base members by the abutment of the flat portion and the projecting portion, the positioning of the fixed shaft in the circumferential direction is also performed at the same time, so that the flexible circuit board, etc. It can be easily and accurately attached and fixed to a fixed shaft that requires positioning in the circumferential direction. For this reason,
Compared with the past, a great reduction in the number of installation steps has been realized,
Moreover, it is possible to obtain a recording disk drive device that can be mounted with high precision.

Further, by using the collar-shaped portion as the holding portion for mounting the flexible circuit board, the number of parts is reduced and the mounting is further facilitated. Further, since the collar-shaped portion also serves as a labyrinth seal member that substantially seals between the drive means side and the disk storage space side, the number of parts is reduced and unclean air on the drive means side is removed from the disk storage side. The leakage is prevented and the reliability is improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a disk drive device according to the present invention will be described with reference to the accompanying drawings. 1 to 3
Shows, for example, an embodiment of a disk drive device for rotationally driving an optical / magnetic disk, FIG. 1 is a sectional view showing a main part of the drive device, and FIG. 2 is a bottom view seen from the lower side of FIG.
(That is, FIG. 1 corresponds to the cross-sectional view taken along the line AA-A 'in FIG. 2.) And FIG. 3 is an enlarged perspective view of an essential part centering on the flexible substrate shown in FIGS. . In these figures, the recording disk mounted on the hub 2 is not shown.

A description will be given below with reference to FIGS. The member 1 is a shaft (fixed shaft) made of carbon steel or the like, and both ends 11 and 12 of the shaft 1 are attached to the upper base 3 and the lower base 4 by screws 15 and 16, respectively (the hole 1
It is fixed by screwing (via 3, 14). The upper and lower bases 3 and 4 are made of, for example, an aluminum alloy. An internal space 41 is defined by the upper base 3 and the lower base 4, and a disk accommodation space is created. FIG.
In Fig. 1, the upper and lower bases 3 and 4 are shown only on the right side in the drawing, but similar upper and lower bases are fastened on the left side. That is, in this embodiment, the upper and lower bases are divided into two parts on the left and right in FIG.

A pair of bearings 19 and 20 are externally fitted and fixed to the upper side of the shaft 1 from a slightly central portion, and a rotor yoke 25 is mounted via these bearings and is rotatably supported. The rotor yoke 25 is made of magnetic martensitic stainless steel. Further, on the outer peripheral side of the rotor yoke 25, the hub 2 to which a disc (not shown) is mounted is externally fitted and fixed. The hub 2 is formed by using, for example, an aluminum alloy. Inner peripheral portion 39 of hub 2 and outer peripheral portion 3 of rotor yoke 25
In order to prevent the hub from collapsing due to the difference in thermal expansion coefficient between the two, the fixing is performed by shrink fitting, and the fitting portion is a part of both and is provided on the relatively lower side of the hub 2. .

A plurality of discs (predetermined number) are fitted and mounted on the outer periphery of the hub 2, and the lowermost portion of the disc is received by the collar portion 35 of the hub 2.
The disc mounted on the hub 2 is fixed by known clamping means.

An annular rotor magnet 24 is mounted on the inner peripheral side of the lower end portion of the rotor yoke 25, and is magnetized in the circumferential direction to have multiple poles. The stator 21 is fixed to the shaft 1 side with a slight gap in the radial direction from the rotor yoke 25. Stator 2
Reference numeral 1 is formed by winding a coil 23 around the magnetic pole teeth of the stator core 22. The stator 21 is fixed via a tubular bush 10 fitted in the shaft 1.

An annular collar portion 30 formed integrally with the lower portion of the bush 10 is provided so as to extend in the radial direction, and the flexible circuit board 8 is positioned above the collar portion 30 (inside the device). A yoke 5 for holding the flexible circuit board 8 is fixed to a bush 10 on the upper side (inside of the apparatus). The yoke 5 is formed of a rolled steel plate into a predetermined shape as shown in FIG. Therefore, the flexible circuit board 8 is attached to the yoke 5, and is sandwiched and held by the yoke 5 and the flange portion 30 (of the bush 10).

A hole 28 is provided in the flexible circuit board 8, and a coil lead wire (not shown) drawn from the coil 23 of the stator 21 is provided in the hole 28.
Is inserted. The coil lead wire is inserted through the hole 28 from the top to the bottom of FIG. 1, and thus is once drawn out to the outside of the device, and the land portion (outside of the device) of the flexible circuit board 8 (outside the device) corresponding to that surface is omitted. It is electrically connected to by soldering. The lead-out portion 3 of the flexible circuit board 8
2 is pulled out of the device.

As is clear from FIG. 3, the yoke 5 for holding the flexible circuit board 8 is led out of the flexible circuit board 8 by the two pieces of holding portions 29, 29 bent (hanging) downward in the drawing. Corresponding to the portion 32, the yoke 5 and the flexible circuit board 8 are positioned thereby. Further, the yoke 5 and the collar portion 30 (of the bush 10) are
The bent portion 9 of the yoke 5 (downward in the drawing) and the cutout portion 49 of the collar portion 30 corresponding to the bent portion 9 are positioned and held and fixed.

Further, the yoke 5 is formed with two flat portions 6, 6 which are bent and hang downward. The planes defined by the two flat portions 6, 6 and the virtual plane generated by these are provided so as to face the wall portion 33 of the projecting portion 7 of the lower base 4 shown in FIGS. 1 and 2. By abutting these, the shaft 1 and the holes 13 and 14 of the upper and lower bases 3 and 4 are correspondingly positioned. At that time, the circumferential positioning of the shaft 1 is also performed at the same time. Therefore, the flexible circuit board 8 arranged on the lower base 4 can be easily positioned.

The member 26 shown in FIG. 1 is a magnetic fluid sealing device, and is fixed to the inner peripheral side of the upper end portion of the hub 2 by adhesion. The magnetic fluid seal device 26 is provided so as to correspond to the upper bearing 19, and is provided so that unclean air, grease, etc. do not leak into the disk housing space 41.
Further, a protective cap 27 is similarly adhered and fixed on the upper side (outer side) of the magnetic fluid seal device 26. On the other hand, the labyrinth bush 34 corresponds to the lower bearing 20.
Is attached to the inner peripheral portion 37 of the hub 2. The tip end portion 36 of the labyrinth bush 34 and the outer peripheral portion 17 of the shaft 1 are arranged to face each other with a slight gap. As a result, a labyrinth seal is formed, and unclean air, grease, etc. for the bearing 20 are prevented from leaking into the disc housing space 41 from the flange 35 side of the hub 2.

In this embodiment, the rotary drive unit 40 is constituted by these components including the stator 21, the rotor magnet 24, and the hub 2 which is rotationally driven via the shaft 1 and the bearings 19 and 20. In this rotary drive unit 40, the hub 2 is rotatably supported on the side of the shaft 1 opposite to the stator 21 via a pair of bearings 19 and 20.
It has a so-called top bearing type structure.

Next, the rotary drive unit 4 will be described with reference to FIG.
The procedure for attaching 0 to the upper and lower bases 3 and 4 will be described below. First, as shown in FIG. 4A, it is assumed that the rotary drive unit 40 is in a state in which the flexible circuit board 8 is temporarily led out in the left direction. In this case, the positional relationship of the rotary drive unit 40 in the circumferential direction is not particularly limited. The rotary drive unit 40 in this state is shown in FIG.
As shown in FIG. 3, the disc is stored in the disc storage space 41 defined by the upper base 3 and the lower base 4. Then, the rotary drive unit 40 is placed inside the accommodation space 41 as it is (rightward in the figure).
Push into.

By the way, the wall portion 33 of the projecting portion 7 provided on the lower base 4 and the hole portion 1 provided on the upper and lower bases 3 and 4.
3 and 14 are positioned corresponding to the mounting dimensions of the rotary drive unit 40. The rotary drive unit 40 pushed into the accommodation space 41 will soon have its yoke 5
The outer peripheral end of the abuts against the wall portion 33 of the protruding portion 7. In this case, the outer peripheral ends of the yokes other than the flat portions 6 (of the yoke 5) are in contact with the wall portion 33, but the rotary drive unit 40 remains as it is.
When is pushed toward the wall portion 33, the flat portions 6, 6 come into contact with the wall portion 33, as shown in FIG. The virtual plane generated by the flat portions 6, 6 substantially comes into contact with the surface of the wall portion 33.

Even if the outer peripheral portions of the yoke 5 other than the flat portions 6, 6 are in contact with the wall portion 33, when the rotary drive unit 40 is pushed into the wall portion 33, the flat portions 6, 6 of the yoke 5 are defined. Since the circular arc portion is cut out, the flat portions 6, 6 come into contact with the wall portion 33 soon. Therefore, the rotary drive unit 40 is automatically positioned with respect to the upper and lower bases 3 and 4 only by mounting the rotary drive unit 40 in the disk accommodating space 41. At this time, the flexible circuit board 8 held by the yoke 5 is also positioned in the circumferential direction with respect to the lower base 4, and the lead-out portion 32 is also moved in a predetermined direction (see FIG. 4).
In (c) and (d), the lead-out portion 32 is not visible), and is positioned at a portion on the opposite side of the drawing.

In this state, the upper and lower end portions 1 of the shaft 1
The screws 15 and 16 can be easily attached to the screws 1 and 13. Unlike the conventional case, it is not necessary to attach a screw while facing one side of the shaft, and a rotary drive unit such as a flexible circuit board 8 or a rotation detecting device that needs to be positioned in the circumferential direction is required without using any jig or tool. It is installed in the position.

In the illustrated example, the protrusion 7 with which the flat portions 6, 6 of the yoke 5 abut is provided on the base 4 side, but the protrusion is provided on the base 3 side, and the flat portion of the yoke is attached to the shaft 1. It may be provided on the upper end 11 side of the. It is also possible to adopt a configuration provided on both sides of the bases 3 and 4. Further, the flat portions 6 and 6 are
Although one piece is provided, the number of pieces can be variously adopted depending on the circumstances of forming the yoke 5. It suffices that the surface of the flat portion 6 corresponds at least to a virtual plane that comes into contact with the wall portion 33 of the protruding portion 7. Of course, it goes without saying that the wall portion 33 may be formed separately on one surface and also on two or more surfaces.

Next, FIGS. 5 and 6 show another embodiment of the present driving device. FIG. 5 is a sectional view and FIG. 6 is a bottom view. All of these show only the rotary drive unit, and the upper and lower bases are not shown. The relationship between FIG. 5 and FIG. 6 is as follows.
It is a B'section. In these figures, description of the same parts and members as those already described in FIGS. 1 and 2 will be omitted. In the rotary drive unit of this embodiment, a stator 121 is fitted in a substantially central portion of a (fixed) shaft 101, and a pair of bearings 11 is provided on both ends 111, 112 side.
9 and 120 are attached. These bearings 119, 12
The rotor yoke 125 and the hub 102 are rotatably supported via 0. (On the outer peripheral side of the bearing 120, the bush 14
The rotor yoke 125 and the hub 102 are supported via the shaft 7. ) Also, the rotor yoke 1 facing the stator 121
A rotor magnet 124 is attached to the inner peripheral portion of 25.

Outside the upper bearing 119 (upper side in the figure),
A magnetic fluid sealing device 126 and a protective cap 127 are attached. Further, a flange portion 105 is attached to the outside of the lower bearing 120 (lower side in the figure). The central portion of the collar portion 105 is externally fitted and fixed to the lower end portion 112 of the shaft. The outer peripheral end 148 of the collar portion 105 and the inner peripheral portion 137 of the rotor yoke 125 are arranged with a slight gap in the radial direction, and a labyrinth seal is formed at this portion.

A flexible circuit board 108 is attached and fixed to the outer side (lower side in the figure) of the collar portion 105, and a lead-out portion 132 thereof is pulled out in a predetermined direction. The coil lead wire 14 led out from the stator 121 is attached to the land portion 143 of the flexible circuit board 108.
2 is electrically connected by solder or the like. The coil lead wire 142 from the stator 121 is connected to the shaft 1
01 is guided to the lower end 112 of the shaft through a groove 146 (notched in the outer peripheral portion 117).

As is apparent from FIGS. 5 and 6, the collar-shaped portion 105 has an arcuate convex portion 145 (corresponding to the flat portion 6 of FIGS. 1 to 3) and a convex portion 106 (FIGS. 1 to 3) at the outer peripheral edge. Flat part 6 of FIG.
Corresponding to) is integrally formed. The contact line 144 generated by these corresponds to the protruding portion 7 of the lower base 4 shown in the previous embodiment, and also in this embodiment, plays a role of positioning the rotary drive unit with respect to the upper and lower bases. Therefore,
When the rotary drive unit is mounted in the disk storage space defined by the upper and lower bases, it can be easily positioned and fixed. The operation and effect of this embodiment are similar to those of the previous embodiment. In this embodiment, the collar portion 105 serves as a holding member for the flexible circuit board 108, and
A labyrinth seal structure is also provided, which is different from the previous embodiment.

Although the embodiments of the recording disk drive device of the present invention have been described above, the design changes or modifications can be freely made without departing from the spirit of the present invention.

[0033]

Since the recording disk drive device of the present invention has the above-mentioned structure, it has the following effects. That is, when the shaft 1 is fixed to the upper and lower bases 3 and 4 in order to mount the rotary drive unit 40 in the disc accommodating space 41, by bringing the shaft 1 into contact with the protrusion 7 of the lower base 4, I interviewed the wall 33,
The shaft 1 is predeterminedly positioned with respect to the upper and lower bases 3 and 4. As a result, the shaft 1 can be easily screwed, and the jigs and tools associated therewith are not required. Further, since the rotational drive unit 40 is also positioned in the circumferential direction, the flexible circuit board 8 can be arranged on the lower base 4 without adjusting the attachment. For this reason, the mounting man-hours are significantly reduced, and even if the apparatus is downsized, the mounting can be easily performed, and the mounting can be performed with high accuracy.

Further, by using the yoke 5 as a holding portion for mounting the flexible circuit board 8, the number of parts is reduced and mounting is further facilitated. Then, further, the collar portion 105
With the labyrinth seal structure, the number of parts is reduced, and unclean air on the drive means side and grease from the bearings are prevented from leaking to the disk accommodating space.

[Brief description of drawings]

FIG. 1 is a sectional view of a recording disk drive device according to the present invention.

FIG. 2 is a bottom view of the recording disk drive device according to FIG.

FIG. 3 is an enlarged perspective view of a part of FIG.

4A to 4D are cross-sectional views showing an assembling order of the recording disk drive device of FIG. 1, and FIGS. 4A to 4D show respective steps.

FIG. 5 is a sectional view of another recording disk drive device according to the present invention.

FIG. 6 is a bottom view of the recording disk drive device according to FIG.

FIG. 7 is a cross-sectional view of a conventional recording disk drive device,
(A) to (c) show respective assembling orders.

[Explanation of symbols]

 1 shaft 2 hub 3 upper base 4 lower base 5 yoke 6 flat part 7 protruding part 8 flexible circuit board 9 bent part 19 bearing 20 bearing 21 stator 24 rotor magnet 25 rotor yoke 26 magnetic fluid seal device 34 labyrinth bush

Claims (3)

[Claims] 1. A fixed column, a hub member on which a recording disk is mounted and which is rotatably supported with respect to the fixed column, drive means for relatively rotating the hub member relative to the fixed column, and a disk accommodating space. And the upper and lower base members that are provided to face each other substantially in parallel, and the fixed strut is a recording disk drive device in which both ends thereof are fixed to the upper and lower base members. Is provided with a collar-shaped portion extending outward in the radial direction, and the collar-shaped portion is provided with a flat portion defined by a straight line substantially perpendicular to the axial direction of the fixed column, and the upper and lower base members. A protrusion that protrudes into the disc storage space is provided on at least one side of the disc storage space, and the flat portion of the collar-shaped portion is provided when the fixed column is mounted on the upper and lower base members. By part abuts on the protruding portion, the fixed post is positioned a predetermined street against upper and lower base member, a recording disk drive device, characterized in that. 2. The recording disk drive device according to claim 1, wherein the collar-shaped portion is a holding member that holds the flexible circuit board. 3. The recording disk drive device according to claim 1, wherein the collar-shaped portion is a labyrinth seal member that substantially seals between the drive means side and the disk storage space side.