JPH11308836A - Disk drive equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide disk drive equipment which can position an insulating sheet on a specified position on a frame without taking time, and maintain the above sate without using an adhesive agent or pressure-sensitive adhesive. SOLUTION: In disk drive equipment 1, an insulating sheet 7 which is arranged in a space between an armature 13 and the upper surface part 221 of a bottom part 22 of a frame 2 can be positioned to the upper surface part of the frame 2, by engaging an engaging hole 71 with a protruding part 82 for positioning, which is formed on the upper surface part 221 of the bottom part 22. Since the insulating sheet 7 can be positioned to the upper surface part 221 of the frame 2 only by enagaging the protruding part 82 for positioning with the engaging hole 71, workability is superior than the case in which work is performed only through visual estimation. Since the insulating sheet 7 is sandwiched between the armature 13 and the frame 2 and is not levitated so that the protruding part 82 for positioning is detached from the engaging hole 71, and the insulating sheet 7 can be maintained at that position without the use of an adhesive agent or pressure-sensitive adhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive for rotating a recording disk such as a hard disk. More specifically, the present invention relates to an insulating structure between an armature and a frame of a disk drive.

[0002]

2. Description of the Related Art A disk drive for rotating a recording disk such as a hard disk includes a hub on which the recording disk is mounted, a metal frame rotatably supporting the hub via bearings, and a frame. And a rotor magnet attached to the hub so as to face the armature.

[0003] In the disk drive device having this configuration, the upper surface of the frame is opposed to and close to the armature coil in the direction of the axis of rotation of the hub. Therefore, an insulating sheet is stuck on the upper surface of the frame with an adhesive or a pressure-sensitive adhesive to prevent a short circuit between the coil and the frame. Here, the frame may be provided with a coil terminal guide hole for drawing out the terminal of the coil to the outside of the frame. In such a case, even if the insulating sheet is disposed on the frame, the insulating sheet may be provided. Must not block the coil terminal guide hole. So, conventionally,
Also make a hole in the insulation sheet.When placing the insulation sheet on the top of the frame, adjust the direction and position of the insulation sheet by visual inspection and overlap the hole in the insulation sheet with the coil terminal guide hole of the frame. After that, the insulating sheet is stuck to the frame with an adhesive or an adhesive so that the insulating sheet does not shift from this state and block the coil terminal guide holes, and is positioned.

[0004]

However, when the insulating sheet is placed at a predetermined position on the frame as in the prior art, the direction and position of the insulating sheet are visually measured, and then the insulating sheet deviates from this state. Adhering the insulating sheet to the frame with an adhesive or pressure-sensitive adhesive is a very time-consuming task.

Further, when an insulating sheet is pasted on a frame with an adhesive or a pressure-sensitive adhesive as in the prior art, a gas may be generated from the adhesive or the pressure-sensitive adhesive. There is a problem in that recording and reproduction of information on the disc are hindered.

[0006] Therefore, an object of the present invention is to position an insulating sheet at a predetermined position on a frame without any trouble.
It is another object of the present invention to provide a disk drive capable of maintaining this state without using an adhesive or an adhesive.

[0007]

In order to solve the above problems, the present invention provides a hub on which a recording disk is mounted, a frame rotatably supporting the hub, a stator core mounted on the frame, and An armature including a coil wound around the stator core; a rotor magnet mounted on the hub so as to face the armature; a lower end of the armature; and an upper surface of the frame facing the lower end. A positioning projection protruding from the upper surface of the frame, and the positioning projection formed on the insulating sheet. The insertion hole is fitted so that the insulating sheet is positioned on the frame.

According to the present invention, the insulating sheet can be positioned on the frame only by arranging the insulating sheet on the upper surface of the frame such that the engaging hole is fitted into the positioning projection projecting from the frame. Therefore, workability is better than performing positioning of the insulating sheet only by eye measurement. In addition, the insulating sheet positioned on the upper surface of the frame is not displaced on the upper surface of the frame because the engagement holes are hooked on the positioning projections. In addition, since the upper surface of the frame and the lower end of the armature are close to each other, the insulating sheet is sandwiched between the upper surface of the frame and the lower end of the armature, and the positioning projection is engaged. The insulating sheet does not rise from the upper surface of the frame so as to come off the hole. Therefore, even without using an adhesive or adhesive,
Since the insulating sheet can be maintained in the positioned state, no gas of adhesive or pressure-sensitive adhesive is generated from the portion where the insulating sheet is attached. Therefore, it is possible to prevent the recording and reproduction of information on the recording disk from being hindered by the gas generated from the adhesive or the adhesive.

In the present invention, a connector having a connection terminal to which a terminal of the coil is electrically connected is attached to a lower surface portion of the frame.
In the connector, it is preferable that the connector is a cylindrical protrusion for guiding a coil terminal, which penetrates a through hole formed in the frame and protrudes from the upper surface of the frame. With this configuration, the coil terminal can be guided to the connection terminal of the connector simply by passing the coil terminal through the cylindrical protrusion for guiding the coil terminal of the connector, so that the connection of the coil terminal can be easily performed. . Further, since a part of the connector serves as a protrusion for positioning the insulating sheet, it is not necessary to form a protrusion dedicated to positioning the insulating sheet. further,
Since the connector main body is formed of an insulating member such as a resin, even when the cylindrical projection protrudes from the upper surface of the frame and approaches the armature, there is no short circuit with the armature. Therefore, it is suitable to be used as a projection projecting from the upper surface of the frame. Furthermore, since the insulating sheet is positioned with the cylindrical projection fitted in the engagement hole of the insulating sheet, the cylindrical projection is not closed by the insulating sheet. Therefore, even if the insulating sheet is arranged on the upper surface of the frame, there is no problem in routing the coil terminal using the cylindrical protrusion.

In the present invention, the positioning protrusion is
A protrusion formed on the frame itself so as to protrude from the upper surface portion may be used.

In the present invention, it is preferable that the insulating sheet is formed in an annular shape so as to surround a rotation center axis of the hub. Since the armature is configured to surround the rotation axis of the hub, all parts of the armature facing the upper surface of the frame in the direction of the rotation axis are insulated by the annular insulating sheet surrounding the rotation axis. Insulation can be ensured with a sheet.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a disk drive according to the present invention will be described with reference to the drawings.

(Overall Configuration) FIG. 1 is a half sectional view showing a disk drive device according to the present invention.

Referring to FIG. 1, a disk drive 1 comprises:
A rotary drive device for a 3.5-inch hard disk, including a frame 2, a fixed shaft 3 fitted to the center of the frame 2 and extending upward, first and second ball bearings 5 with respect to the fixed shaft 3, The hub 4 is rotatably supported via a hub 6.

The frame 2 is made of metal and is formed on a thick cylindrical central portion 21 to which the fixed shaft 3 is fixed, an annular bottom portion 22 extending horizontally from the central portion 21, and an outer peripheral edge of the bottom portion 22. The flange portion 23 is provided. A cylindrical portion 25 extending in the direction of the axis L of the fixed shaft 3 (the rotation axis of the hub 4) is formed near the center portion 21 of the upper surface 221 of the bottom portion 22 so as to surround the fixed shaft 3. This cylindrical part 2
The stator core 11 is attached to the outer peripheral surface 26 of the fifth.

The stator core 11 has a plurality of radial projections 11 projecting at equal angular intervals around the axis L of the fixed shaft 3.
1 is provided. Coil 1 for each radial projection 111
2 are wound to form an armature 13.

The hub 4 is formed in a thick cylindrical shape, and a step surface 47 is a mounting surface for a hard disk (not shown). The lower end of the hub 4 has a stator core 11
A cylindrical portion 42 that covers the outer peripheral surface of is formed. Cylindrical part 4
An annular rotor magnet 15 is mounted on the inner peripheral surface of the second through an annular yoke 14 so as to face the stator core 11.

A bearing holding hole 43 is formed in the hub 4, and first and second ball bearings 5 and 6 are mounted between an inner peripheral surface 431 of the bearing holding hole 43 and an outer peripheral surface 301 of the fixed shaft 3. ing. The labyrinth seal member 9 is provided on the inner peripheral surface 431 of the bearing holding hole 43.
Is mounted so as to be in contact with the outer ring upper end surface 522 of the first ball bearing 5 located on the side of the shaft end 31 of the fixed shaft 3.

(Insulation Structure of Frame 2 and Armature 13) In the frame 2 of the disk drive device 1 thus configured, the connector 8 having the connection terminal 85 of the power supply terminal 121 of the coil 12 on the lower surface 222 of the bottom 22. At a position corresponding to this, a circular through hole 24 is formed in the frame 2.

The connector 8 has a base 84 formed of a resin and formed in a plate shape having a constant thickness, and a cylindrical tubular projection 81 projecting from the center of the base 84. The connector 8 is adhered to the lower surface 222 of the bottom 22 with the cylindrical projection 81 inserted into the through hole 24 from the lower surface 222 of the bottom 22. The inner peripheral surface of the cylindrical projection 81 is formed in a conical shape, and the terminal 1 of the coil 12 is formed.
Coil terminal guide hole 8 for pulling out 21 from inside the device
It is 3. The coil terminal guide hole 83 is formed so as to penetrate the cylindrical protrusion 81 and the base 84.

On the opposite side of the surface of the base 84 on which the cylindrical projection 81 is formed, a connection terminal 85 to which the power supply terminal 121 drawn out from the coil terminal guide hole 83 is connected is provided for three phases and a common terminal. For a total of four locations. A power supply connector (not shown) is connected to the connector 8 along a guide 86 protruding from a side opposite to the surface on which the cylindrical protrusion 8 is formed, and power is supplied to the coil 12.

Further, the cylindrical projection 81 of the connector 8 penetrates through the bottom 22 of the frame 2 through the through hole 24, and the tip of the cylindrical projection 81 protrudes above the upper surface 221 of the bottom 22. . In this embodiment, the upper surface 2 of the bottom 22
The distal end portion of the cylindrical projection 81 projecting from 21 serves as a positioning projection 82 for positioning an insulating sheet 7 described later. The outer peripheral edge of the distal end surface of the positioning projection 82 is tapered.

In the disk drive 1 constructed as described above, the upper surface 221 of the bottom portion 22 of the frame 2 and the lower end of the armature 13 face each other in the direction of the rotation axis L of the hub 4 and are close to each other. The insulating sheet 7 is disposed on the upper surface 221 of the bottom 22 so that the frame 2 and the armature 13 do not short-circuit.

FIG. 2 is a plan view showing the insulating sheet 7. As shown in FIGS. 1 and 2, the insulating sheet 7 is formed in an annular shape, and surrounds a cylindrical portion 25 formed on the frame 2 for attaching a stator core.
1. There may be a slight gap between the inner peripheral edge 72 of the insulating sheet 7 and the outer peripheral surface of the cylindrical portion 25 of the frame 2. Here, the insulating sheet 7 is merely placed on the upper surface 221 of the bottom 22 of the frame 2,
No adhesive or pressure-sensitive adhesive for fixing the insulating sheet 7 to the frame 2 is used.

The insulating sheet 7 has a bottom 22 on the frame 2.
A circular engaging hole 71 having a diameter substantially the same as or slightly larger than the opening of the through-hole 24 formed in the above.
As described below, the engaging hole 71 overlaps the through hole 24 when the insulating sheet 7 is arranged at a predetermined position on the upper surface 221 of the bottom portion 22 of the frame 2 in a predetermined direction.

That is, in the present embodiment, as shown in FIG.
The insulating sheet 7 is placed on the upper surface portion 221 of the frame 2 so that the positioning projections 82 (tips of the cylindrical projections 81 of the connector 8) protruding from the fitting 21 are fitted. On the other hand, the armature 13 is mounted. As a result, the insulating sheet 7 is disposed between the lower end of the armature 13 and the bottom 22 of the frame 2.

By doing so, the cylindrical projection 81 is always exposed from the engaging hole 71 of the insulating sheet 7. Moreover, since the engaging holes 71 are hooked on the positioning projections 82, the insulating sheet 7 does not shift on the upper surface 221 of the frame 2. Therefore, at the time of assembly, the upper surface portion 22 of the bottom portion 22
After placing the insulating sheet 7 on the frame 1, the armature 1
3, the insulating sheet 7 does not block the coil terminal guide hole 83 until the power supply terminal 121 of the coil 12 is passed through the coil terminal guide hole 83.
Therefore, the terminal 12 of the coil 12 is inserted into the coil terminal guide hole 83.
There is no problem in passing one.

Further, only by placing the insulating sheet 7 on the upper surface 221 of the bottom portion 22 of the frame 2 so that the positioning projection 82 projecting from the frame 2 fits into the engagement hole 71,
The positioning of the insulating sheet 7 with respect to the frame 2 can be performed. Therefore, as compared with the conventional structure in which the positioning of the insulating sheet 7 is performed only by visual measurement so that the engaging hole 71 of the insulating sheet 7 matches the through hole 24 formed in the bottom portion 22,
Workability during assembly can be improved.

Since the insulating sheet 7 has the engaging holes 71 hooked on the positioning projections 82, the insulating sheet 7 does not need to be fixed to the frame 7 by a method such as bonding.
There is no displacement on 21. In addition, the upper surface 221 of the frame 2 and the coil 12 of the armature 13 are so close to each other that insulation cannot be achieved unless the insulating sheet 7 is interposed.
Accordingly, the insulating sheet 7 is sandwiched between the upper surface 221 of the bottom 22 and the lower end of the coil 12, so that the engagement holes 71 of the insulating sheet 7 come off the positioning projections 82. The insulating sheet 7 does not rise from the upper surface 221 of the bottom 22. Therefore, the insulating sheet 7 can be held in a state of being positioned with respect to the frame 2 without using an adhesive or a pressure-sensitive adhesive. Does not occur. Therefore, it is possible to prevent the recording and reproduction of information on the hard disk from being hindered by the gas.

Further, since the connector 8 is made of an insulating resin, the cylindrical projection 81 protrudes from the upper surface 221 of the frame 2, so that even when the connector 8 is close to the armature 13, it is short-circuited with the armature 13. Absent. Therefore, frame 2
It is suitable to be used as the positioning projection 82 projecting from the upper surface 221 of the optical disc. The cylindrical projection 8 of the connector 8
1 is used for positioning the insulating sheet 7, there is no need to form a dedicated positioning projection, and the cylindrical protrusion 81 is formed between the coil terminal 121 and the frame 2.
It also functions to prevent short circuit between

Further, since the insulating sheet 7 is formed in an annular shape surrounding the axis L, the armature 13 formed so as to surround the axis L is positioned in the direction of the axis L with respect to the upper surface portion 22 of the frame 2. All the opposing portions can be reliably insulated by the insulating sheet 7.

(Other Embodiments) In the above embodiment, since the positioning projection 82 is formed by using the cylindrical projection 81 for guiding the coil end of the connector 8, the insulating sheet 7 is formed.
In this case, it is only necessary to form one engagement hole 71 that also serves as a positioning for passing the power supply terminal 121 of the coil 12, but another portion of the connector 8 is used as a projection for positioning the insulating sheet 7. You may make it protrude from the upper surface part 221 of the frame 2. In this case, two holes are formed in the insulating sheet 7, the engaging hole 71 engaging with the positioning projection 82 and the hole through which the power supply terminal 121 passes.

The upper portion 22 of the bottom portion 22 of the frame 2
The positioning projection 82 need not be the cylindrical projection 81 of the connector 8 as long as it protrudes from the connector 1.

For example, as shown in FIG. 4, a projection 91 projecting from the upper surface 221 of the bottom 22 may be formed on the frame 2 itself, and this projection 91 may be used as a positioning projection.
The protrusion 91 can be formed in a cylindrical shape along the periphery of the through hole 24 formed in the frame 2. If the through-hole 71 of the insulating sheet 7 is fitted to the outer peripheral surface of the projection 91, the positioning of the insulating sheet 7 can be performed. In addition, in the case where the armature 13 and the protrusion 91 are formed in such a manner, the upper end 87 of the cylindrical protrusion 91 of the connector 8 attached to the through hole 24 is made to protrude above the upper end 92 of the protrusion 91.
Can be prevented from being short-circuited.

Further, in the above embodiment, the fixed shaft type disk drive device 1 in which the fixed shaft 3 is fixed to the frame 2 has been described. However, the present invention is also applied to a shaft rotating type disk drive device in which the shaft rotates together with the hub 4. Can be applied.

[0036]

As described above, according to the disk drive of the present invention, the insulating sheet is merely placed on the upper surface of the frame so that the engaging hole is fitted into the positioning projection projecting from the frame. The positioning of the insulating sheet can be performed. Therefore, workability is better than performing positioning of the insulating sheet only by eye measurement. In addition, since the engaging hole is caught by the positioning projection, the insulating sheet does not shift in position on the upper surface of the frame. In addition, since the upper surface of the frame and the armature are close to each other, the insulating sheet does not float up from the upper surface of the frame to the extent that the positioning projection comes off the engagement hole. Accordingly, the insulating sheet can be maintained at the position where the insulating sheet is positioned without using an adhesive or an adhesive, so that recording and reproduction of information on the recording disk are hindered by a gas generated from the adhesive or the adhesive. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a disk drive device to which the present invention is applied.

FIG. 2 is a plan view showing an insulating sheet used in the disk drive device shown in FIG.

FIG. 3 is a perspective view showing a state where an insulating sheet is attached to a frame of the apparatus shown in FIG. 1;

FIG. 4 is a schematic diagram for explaining another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disk drive device 2 Frame 3 Fixed shaft 4 Hub 5, 6 Ball bearing 7 Insulating sheet 8 Connector 11 Stator core 12 Coil 13 Armature 22 Bottom part 24 Coil terminal guide hole 25 Cylindrical part 71 Engagement hole 81 Cylindrical projection 82 Positioning projection Part 85 Connection terminal 111 Radial positioning projection 121 Terminal 221 Bottom upper surface 222 Bottom lower surface L axis

Claims (4)

[Claims] 1. An armature including a hub on which a recording disk is mounted, a frame rotatably supporting the hub, a stator core mounted on the frame, and a coil wound on the stator core. A disk drive device comprising: a rotor magnet mounted on the hub so as to face the armature; and an insulating sheet disposed between a lower end of the armature and an upper surface of the frame facing the lower end. A positioning protrusion projects from the upper surface of the frame, and an engaging hole formed in the insulating sheet is fitted into the positioning protrusion, so that the insulating sheet is attached to the frame. A disk drive device positioned above. 2. The connector according to claim 1, wherein a connector having a connection terminal to which a terminal of the coil is electrically connected is attached to a lower surface portion of the frame, and the positioning protrusion is one of the connectors. A disk drive device comprising: a cylindrical projection for guiding a coil terminal, which penetrates a through hole formed in a frame and protrudes from the upper surface of the frame. 3. The disk drive according to claim 1, wherein the positioning projection is a projection formed on the frame itself so as to project from the upper surface. 4. The disk drive according to claim 1, wherein the insulating sheet is formed in an annular shape so as to surround a rotation center axis of the hub.