JP2007179599A - Disk drive apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk drive apparatus in which the relative height accuracy of the height of a pivot base face and a magnet hold face is kept high and gap accuracy between a VCM coil and a VCM magnet is consequently kept. <P>SOLUTION: The drive apparatus D is provided with a chassis 11, a spindle motor 2 fixed to the chassis 11, a head 5 for recording and reproducing data in and from a recording disk medium, a swing arm 6 holding the head 5 at one end side and turning around a pivot bearing 7, the VCM coil 8 provided on the other end side of the swing arm, and the VCM magnet 9 arranged so that it faces the VCN coil 8. In the chassis 11, an interposing member 3 unitizing the pivot base face31 and the magnet hold face 32 is installed with a spindle motor reference face 11a on the chassis 11 as a reference. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a disk drive device that is loaded with a recording disk medium and records and / or reproduces data on the recording disk medium.

  Conventionally, a disk drive apparatus is known as an apparatus for recording and / or reproducing data on a recording disk medium (see, for example, Patent Document 1). 5A and 5B are diagrams showing a conventional disk drive device, where FIG. 5A is an exploded perspective view and FIG. 5B is a sectional side view. As shown in FIG. 5A, the disk drive device 100 generally has a substantially rectangular box-shaped chassis 101 that opens upward, and a cover 102 that closes the opening of the chassis 101. Inside the chassis 101 and the cover 102, a swing arm 104 holding a head 103 for recording and / or reproducing data at the tip thereof, and the swing arm 104 is rotated around a pivot bearing 105, so that the head 103 A voice coil motor (VCM: Voice Coil Motor) 106 is mounted as an actuator for moving the disk to a desired position on the recording disk 110. The recording disk 110 is rotationally driven by a spindle motor 111 that is a medium driving motor, and data is recorded and / or reproduced by a head 103 held by a swing arm 104.

  The voice coil motor 106 includes a VCM coil 106a coupled to the rear end side of the swing arm 104, and a VCM magnet 106b disposed so as to face the VCM coil 106a. As shown in FIG. 5B, there is a suitable gap between the VCM coil 106a and the VCM magnet 106b, and the variation in gap accuracy greatly affects the drive characteristics as an actuator.

Conventionally, in order to match the relative heights of the VCM coil 106a and the VCM magnet 106b, they have various structures. For example, (1) Although not shown in the figure, a method in which a pivot base surface for supporting a pivot bearing is additionally formed on a chassis on which a magnet holding surface for holding a VCM magnet is formed to adjust the height position, or (2) As shown in FIG. 5B, a method of attaching a magnet holding surface 107 made of another member to the chassis 101 in accordance with the position of the pivot base surface 101a formed on the chassis 101 for supporting the pivot bearing 105, etc. There is. In these cases, the height of the pivot base surface 101a serving as the base of the pivot bearing 105 must be accurately raised with respect to the height of the spindle motor 111 (see FIG. 5A).
JP 2004-48924 A

However, in the prior art (1), the relative height of the reference surface of the spindle motor and the pivot base surface on the chassis is adjusted by additionally processing the pivot base surface after pressing the chassis. For this reason, it has been difficult to maintain the accuracy of the relative height of the pivot base surface that has been additionally machined and the magnet holding surface whose height is determined only by pressing.
In the above-described prior art (2), when the magnet holding surface 107 which is a separate member is attached to the chassis 101 with respect to the pivot base surface 101a raised with respect to the spindle motor 111, the following inconvenience occurs. . That is, when the magnet holding surface 107 is fixed to the chassis 101 by screw fastening, there is a problem that the thickness increases. Further, when the magnet holding surface 107 is fixed to the chassis 101, the chassis 101 itself is distorted, and a height deviation occurs between the pivot base surface 101a and the magnet holding surface 107 or the reference surface of the spindle motor 111. There was a thing.

  If the gap accuracy between the VCM coil 102a and the VCM magnet 102b varies due to the relative height difference between the pivot base surface 103a and the magnet holding surface 103b, the drive characteristics of the swing arm 104 deteriorate. there were.

  Therefore, the present invention maintains a high relative height accuracy of the height of the pivot base surface and the height of the magnet holding surface, and thus can maintain a high gap accuracy between the VCM coil and the VCM magnet. It is an object to provide an apparatus.

  In order to solve the above-mentioned problems, an invention according to claim 1 of the present invention is directed to a chassis, a medium driving motor fixed to the chassis and configured to rotate the recording disk medium, and data to the recording disk medium. A head that performs recording and / or reproduction, a swing arm that holds the head at one end and rotates around an actuator pivot, a VCM coil provided at the other end of the swing arm, and the VCM coil And a VCM magnet arranged so that the chassis has a pivot base surface for holding the actuator pivot and a magnet holding surface for holding the VCM magnet integrated with each other. Is based on the reference plane of the media driving motor on the chassis. To, and being attached.

  According to such a disk drive device, the interposition member in which the pivot base surface and the magnet holding surface are integrated is attached to the chassis with reference to the reference surface of the media drive motor. The accuracy of the relative height of the height, the height of the pivot base surface, and the height of the magnet holding surface can be maintained high. Thereby, the gap accuracy between the VCM coil and the VCM magnet can be maintained high.

  The invention according to claim 2 is the method of manufacturing the disk drive device according to claim 1, wherein the pivot base surface is defined as the intermediate member with reference to a reference surface of the media driving motor on the chassis. The interposition member is fixed to the chassis after being positioned on the chassis so as to have a height of.

According to such a disk drive device manufacturing method, the interposition member is positioned on the chassis so that the pivot base surface is at a predetermined height with respect to the reference surface of the media driving motor, and then fixed to the chassis. Therefore, the accuracy of the relative height between the reference surface of the media drive motor and the pivot base surface is high, and since the pivot base surface and the magnet holding surface are integrated, the pivot base surface And the accuracy of the relative height of the magnet holding surface can be kept high. Thereby, the gap accuracy between the VCM coil and the VCM magnet can be maintained high.
The “predetermined height” refers to a height at which the height position of the swing arm supported by the actuator pivot matches the position of the recording disk medium driven by the medium driving motor.

  According to the present invention, the accuracy of the relative height of the height of the pivot base surface and the height of the magnet holding surface can be maintained high, so that the gap accuracy between the VCM coil and the VCM magnet can be maintained. it can. Thereby, the drive characteristic of a swing arm can be stabilized.

The best mode for carrying out the present invention will be described in detail with reference to the drawings.
In the drawings to be referred to, FIG. 1 is a perspective view showing a recording disk cartridge set in the drive device according to the present embodiment, where (a) is a diagram seen from the upper front and (b) is a diagram seen from the lower rear. FIG. FIG. 2 is an exploded perspective view of the drive device according to the present embodiment, and FIG. 3 is a plan view of the drive device according to the present embodiment. 4 is a cross-sectional view taken along line IV-IV in FIG.

First, the recording disk cartridge set in the drive device according to the present embodiment will be described.
As shown in FIGS. 1A and 1B, the recording disk cartridge C1 includes a cartridge case C10, a rotary shutter C20 rotatably disposed inside the cartridge case C10, and an interior of the rotary shutter C20. And a recording disk medium C30 that is rotatably arranged.

The cartridge case C10 is a thin box-like body, and has an access opening C11 cut out in a wedge shape on the front side in the direction of insertion into the drive device D. The head 5 (see FIGS. 2 and 3) of the drive device D, which will be described later, accesses the recording disk medium C30 through the access opening C11.
Further, as shown in FIG. 1B, an arcuate guide groove C12 is formed on the lower surface of the cartridge case C10 on the left side thereof. The guide groove C12 is formed with a predetermined curvature so that a shutter knob C22 of a rotary shutter C20, which will be described later, follows the track.

  The rotary shutter C20 is a hollow structure whose outer shape has a substantially disk shape, and has a notch C21 having substantially the same shape as the access opening C11 of the cartridge case C10. The rotary shutter C20 is rotatably attached to the cartridge case C10. As shown in FIG. 1B, a shutter knob C22 projects from the lower surface of the rotary shutter C20. The shutter knob C22 protrudes downward through the guide groove C12 of the cartridge case C10.

  A hub C31 is fixed to the center of the recording disk medium C30, and is exposed below the cartridge case C10.

  When such a recording disk cartridge C1 is inserted into the drive device D (see FIGS. 2 and 3), the shutter knob C22 moves while drawing an arc-shaped trajectory toward the front side in the guide groove C12. With this movement, the rotary shutter C20 rotates, so that the access opening C11 of the cartridge case C10 and the notch C21 of the rotary shutter C20 overlap. As a result, the recording disk medium C30 is exposed to the outside, and data can be recorded and / or reproduced by the head 5 of the drive device D (see FIGS. 2 and 3).

Next, the drive device D according to the present embodiment will be described.
As shown in FIG. 2, the drive apparatus D (recording disk drive apparatus) according to this embodiment includes a casing 1 and a spindle motor 2 (media driving motor) for rotating the recording disk medium C30 (see FIG. 1). An interposition member 3 mounted in the casing 1, a yoke 4 mounted in the casing 1, a head 5 for recording and / or reproducing data on a recording disk medium C30 (see FIG. 1), and the head The swing arm 6 that holds 5 at the tip, the pivot bearing 7 that is the center of rotation of the swing arm 6, the VCM coil 8 that is provided on the other end of the swing arm 6, and the VCM coil 8 face each other. Are mainly provided with a pair of VCM magnets 9 and 9 arranged vertically. The pivot bearing 7 in the present embodiment corresponds to the “actuator pivot” in “Claims”.

  The casing 1 includes a chassis 11 that is attached to a rectangular box that is open at the top, and a cover 12 that closes the opening of the chassis 11. The chassis 11 is made of a non-magnetic material, and is formed with a spindle motor reference surface 11a serving as a reference when the spindle motor 2 is attached, and a hole portion 11b for attaching the interposition member 3. The cover 12 is attached to the upper side of the chassis 11, and an accommodation space for accommodating each component is formed between the chassis 11 and the cover 12.

  The spindle motor 2 is positioned with respect to the spindle motor reference surface 11 a of the chassis 11 and fixed on the chassis 11. The spindle motor 2 chucks the hub C31 (see FIG. 1B) of the recording disk cartridge C1 set in the drive device D, and rotates the recording disk medium C30 around its rotation axis.

  The interposition member 3 is a member in which a pivot base surface 31 that is recessed in a circular shape and a magnet holding surface 32 that is raised with reference to the pivot base surface 31 are integrated, and a member made of a magnetic material is pressed. To be molded. The pivot base surface 31 is a surface serving as a base of the pivot bearing 7. A screw hole 31 a for fastening the pivot bearing 7 with a set screw V (see FIG. 4) is formed in the center of the pivot base surface 31. The interposition member 3 is fitted into the hole 11b of the chassis 11, and the end portion 3a (see FIG. 4) of the interposition member 3 is placed with the height position of the pivot base surface 31 aligned with the height position of the spindle motor reference surface 11a. These are fixed by welding to the inner peripheral surface side of the hole 11b at a plurality of locations. The magnet holding surface 32 is a surface to which the VCM magnet 9 is fixed. The magnet holding surface 32 is required to have a high accuracy relative to the pivot base surface 31. However, since the pivot base surface 31 and the magnet holding surface 32 are integrally formed, the accuracy is maintained high. ing.

  The yoke 4 is formed of a magnetic member, and has a fixed portion 41, a leg portion 42 that is bent and rises from the fixed portion 41, and a magnet holding formed by bending the leg portion 42 in the opposite direction to the fixed portion 41. Surface 43. The fixing part 41 is attached to the interposition member 3. When the fixing portion 41 is attached to the interposition member 3, the magnet holding surface 43 and the interposition member 3 face each other, and a slight gap is formed between the interposition member 3 and the yoke 4 due to the height of the leg portion 42. Is done. The VCM magnet 9 is fixed to the magnet holding surface 43 on the lower surface side.

  The head 5 is a head for recording and / or reproducing data with respect to the recording disk medium C30, and is held at the tip of the suspension arm 61 of the swing arm 6.

  The swing arm 6 includes a pair of suspension arms 61 and 61 and a coil holder 62 that supports the suspension arms 61 and 61 on the rear end side. The swing arm 6 is rotatably supported by the pivot bearing 7 in the vicinity of the center thereof. The pair of suspension arms 61 and 61 are provided in parallel, and each have a head 5 on the opposing surface. Thus, data can be recorded and / or reproduced on both the front and back surfaces of the recording disk medium C30 of the recording disk cartridge C1 set in the drive device D. The coil holder 62 is provided with a VCM coil 8.

  The pivot bearing 7 (actuator pivot) is a member that serves as a rotation axis of the swing arm 6. The lower part of the pivot bearing 7 is positioned by a part of the pivot bearing 71.

  The VCM coil 8 is provided in a coil holder 62 on the rear end side of the swing arm 6. A pair of VCM magnets 9 and 9 are arranged so as to face the top and bottom of the VCM coil 8.

  Of the pair of VCM magnets 9, 9, the lower VCM magnet 9 A is fixed to the magnet holding surface 32 of the interposition member 3 as described above, and the upper VCM magnet 9 B is attached to the magnet holding surface 43 of the yoke 4. It is fixed. As described above, the VCM magnet 9A fixed to the interposing member 3, the VCM magnet 9B fixed to the yoke 4, and the VCM coil 8 constitute a voice coil motor (VCM). That is, the swing arm 6 rotates around the pivot bearing 7 as shown in FIG. 3 due to the electromagnetic force generated by the interaction between the electric field generated when the VCM coil 8 is energized and the magnetic field of the VCM magnets 9A and 9B. The head 5 can be moved onto the recording disk medium C30. Note that the swing arm 6 normally makes the head 5 stand by at the ramp portion L on the chassis 11 when the recording disk cartridge C1 is not set.

  In such a drive device D, first, the interposition member 3 is positioned so that the pivot base surface 31 has a predetermined height with respect to the spindle motor reference surface 11a on the chassis 11, and then fixed to the chassis 11. To do. Thereby, the accuracy of the relative height of the spindle motor reference surface 11a and the pivot base surface 31 is increased. The “predetermined height” is a height at which the height position of the swing arm 6 matches the position of the recording disk medium C30 of the loaded recording disk cartridge C1.

Next, the operation of the drive device D will be described.
When the recording disk cartridge C1 is inserted into the drive device D, the rotary shutter C20 of the recording disk cartridge C1 is opened, and the recording disk medium C30 faces outside in the drive device D. In the drive device D, the spindle motor 2 is driven by a drive signal to a drive circuit (not shown), and the recording disk medium C30 is rotated accordingly. In addition, when the VCM coil 8 of the drive device D is energized, the swing arm 6 rotates about the pivot bearing 7 between the interposition member 3 and the yoke 4, and the head 5 moves from the ramp portion L to the recording disk medium. Move to the surface of C30. Thereby, recording and / or reproduction of data with respect to the recording disk medium C30 by the head 5 can be performed.

According to the above, the following effects can be obtained in the drive device D according to the present embodiment.
According to such a drive device D, since the interposition member 3 in which the pivot base surface 31 and the magnet holding surface 32 are integrated is attached to the chassis 11, the height of the pivot base surface 31 and the magnet holding surface 32. The relative height accuracy of the height can be kept high. That is, since the accuracy of the relative height of the position of the pivot base surface 31 on which the swing arm 6 is held and the magnet holding surface 32 is high, the gap accuracy between the VCM coil 8 and the VCM magnet 9 is shown in FIG. Can be kept high.

In particular, when the interposition member 3 is attached to the chassis 11, the interposition member 3 is adjusted based on the spindle motor reference surface 11a (see FIG. 2), that is, according to the height of the recording disk cartridge C1 (see FIG. 1) to be set. Then, after the pivot base surface 31 is positioned on the chassis 11 so as to have a predetermined height, it is fixed to the chassis 11. For this reason, the accuracy of the relative height of the spindle motor reference surface 11a and the pivot base surface 31 is high, and the pivot base is the interposition member 3 in which the pivot base surface 31 and the magnet holding surface 32 are integrated. The accuracy of the relative height between the surface 31 and the magnet holding surface 32 can also be maintained high. Thereby, the gap accuracy between the VCM coil 8 and the VCM magnet 9 can be maintained at a higher level.
As described above, the drive characteristics of the swing arm 6 can be stabilized.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, It can implement with a various form.
For example, in the present embodiment, it is configured as a drive device D for a removable recording disk cartridge, but may be configured as a hard disk drive device.

4A and 4B are perspective views showing a recording disk cartridge set in the drive device according to the present embodiment, where FIG. 5A is a diagram seen from the upper front obliquely, and FIG. It is a disassembled perspective view of the drive device concerning this embodiment. It is a top view of the drive device concerning this embodiment. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. It is a figure which shows the conventional disk drive apparatus, (a) is a disassembled perspective view, (b) is a cross-sectional side view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Casing 2 Spindle motor 3 Interposition member 4 Yoke 5 Head 6 Swing arm 7 Pivot bearing 8 VCM coil 9, 9A, 9B VCM magnet 11 Chassis 11a Spindle motor reference surface 12 Cover 31 Pivot base surface 32 Magnet holding surface C1 Recording disk cartridge D Drive device

Claims (2)

The chassis,
A medium driving motor fixed to the chassis for rotating a recording disk medium;
A head for recording and / or reproducing data on the recording disk medium;
A swing arm for holding the head on one end side;
An actuator pivot that is a pivot axis of the swing arm;
A VCM coil provided on the other end of the swing arm;
A VCM magnet arranged to face the VCM coil;
A disk drive device comprising:
An interposition member in which a pivot base surface for holding the actuator pivot and a magnet holding surface for holding the VCM magnet are integrated with the chassis is attached with reference to a reference surface of the media driving motor on the chassis. A disk drive device characterized by that. A method of manufacturing a disk drive device according to claim 1,
The intermediate member is positioned on the chassis so that the pivot base surface is at a predetermined height on the basis of the reference surface of the media driving motor on the chassis, and then the intermediate member is fixed to the chassis. A method of manufacturing a disk drive device characterized by the above.

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