JP2009230804A - Yoke component and disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a yoke component and a disk device that suppress vibration of a yoke member due to disturbance vibration or vibration caused by the device, achieve stable carriage drive, and have high reliability. <P>SOLUTION: The yoke component can be mounted on a disk device base, and has a member body, a spring part provided in the member body, and a magnet provided on the member body. Further, the yoke component can be mounted on the disk device base, and has a member body having a hole in a horseshoe shape, a spring part that projects toward the hole in a horseshoe shape, and a magnet provided on the member body. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a yoke component of a voice coil motor and a disk device incorporated in a disk device such as a hard disk device.

  A disk device such as a hard disk device (HDD) carries a head actuator, and the head actuator is driven by a voice coil motor (VCM). The VCM includes a magnetic yoke, and the yoke generally includes an upper yoke member and a lower yoke member that are coupled to each other. The upper and lower yoke members are provided with magnets that generate a magnetic field.

  The lower yoke member is received by the first reference surface on the base member that is the base of the HDD, and the upper yoke member is received by the second reference surface defined on the boss rising from the base member. The member is screwed to the second reference surface.

  A voice coil fixed to the head actuator is disposed between the upper and lower yoke members so as to correspond to the magnet, and is rotatably held on a rotation center axis on the base.

  At this time, the magnetic flux circulates through the two yoke members. In the voice coil, a magnetic flux is generated based on the current flow, and the voice coil is driven based on the interaction between the magnetic flux of the voice coil and the magnetic flux of the yoke. This causes the head actuator to swing.

  When the lower yoke member is positioned on such a first reference surface on the base, the upper yoke member cannot necessarily contact the first reference surface due to a dimensional error of the yoke. Further, since the upper yoke member cannot be supported by the boss, if the voice coil moves at a high speed, the reaction causes the vibration in the yoke.

As a technique for suppressing the occurrence of such vibrations, even when the lower yoke member is brought into contact with the mounting surface of the base with a screw and the lower yoke member is lifted from the base due to a dimensional error or the like, the screw is advanced Have proposed a yoke for a voice coil motor and a recording disk drive device that are surely abutted and supported to suppress vibration and noise (for example, Patent Document 1).
JP 2006-252737 A

However, in the above-described technique, it is necessary to adjust the advance / retreat of the screw for each recording disk drive device, which causes a problem that the tact time at the time of manufacture becomes longer.
The present invention has been made in view of the above points, and its purpose is to eliminate the need for unnecessary work such as screw adjustment, and to suppress the vibration of the yoke member due to disturbance vibrations and vibrations generated by the apparatus itself, and is stable. It is an object of the present invention to provide a highly reliable yoke component and disk device that can be driven by a carriage.

  In order to achieve the above object, a yoke component of the present invention is a yoke component that can be attached to a disk device base, and is provided on a member main body, a spring portion provided on the member main body, and the member main body. It is characterized by comprising a magnet.

  Furthermore, the yoke component of the present invention is a yoke component that can be attached to the disk device base, and includes a member main body having a horseshoe-shaped hole, a spring portion protruding toward the horseshoe-shaped hole, and a member on the member main body. And a provided magnet.

  Further, the disk device of the present invention includes a base having a mounting base and a protrusion, a member main body that can be attached to the mounting base of the base, and a spring provided on the member main body. And a fixing member for fixing the spring portion to be elastically deformed by contacting the spring component of the yoke component member, the yoke component member having a magnet provided on the member main body, and the protrusion of the base. And a member.

  Furthermore, the disk device of the present invention includes a base having a mounting base and a protrusion, a member main body having a horseshoe-shaped hole, which can be mounted in contact with the mounting base of the base, and the horseshoe A spring portion protruding toward the hole, a yoke component having a magnet provided on the member main body, a protrusion of the base and a spring portion of the yoke component are in contact, and the spring portion is elastic. And a fixing member that is fixed so as to be deformed.

  According to the present invention, the spring portion provided in the member main body of the yoke constituent member constituting the bottom yoke, or the spring portion protruding toward the horseshoe-shaped hole provided in the member main body comes into contact with the protruding portion of the base and is elastically deformed. This eliminates unnecessary work such as screw adjustment and suppresses vibration of the yoke member due to disturbance vibration or vibration generated by the device itself, enabling stable carriage driving and providing a highly reliable yoke component. A disk device can be provided.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
<First Embodiment>
FIG. 1 is a diagram showing main components of a magnetic disk device (HDD) that is a disk device according to a first embodiment of the present invention.
Reference numeral 1 denotes a magnetic disk on which data is recorded. Reference numeral 2 denotes a spindle motor for attaching and rotating the magnetic disk 1. Reference numeral 3 denotes a carriage mounted with a head (not shown) that swings on the magnetic disk 1 and reads / writes data. Reference numeral 4 denotes a base that constitutes a base portion to which functional parts such as the spindle motor 2 and the carriage 3 are attached and stored. A cover 5 covers the inside of the base 4.

  1 is a voice coil motor (VCM), and includes a top yoke 61 as an upper yoke member and a bottom yoke (member main body) 62 as a lower yoke member described in detail in FIG. A coil (not shown) incorporated in the carriage 3 is surrounded by a top and bottom, and the carriage 3 becomes a drive source that swings on the magnetic disk 1 by energizing the coil.

Next, the first embodiment of the present invention will be described in detail with reference to FIGS.
FIG. 2 is a perspective view showing a mounting state of the bottom yoke 62 with the carriage 3 shown in FIG. 1 and the top yoke 61 removed.
Reference numeral 63 denotes a magnet, which is adhered and fixed to the bottom yoke 62, and forms a magnetic circuit at a position facing the magnet (magnet) 63 (not shown) on the top yoke 61 side. Reference numeral 70 denotes a screw as a fixing member for fixing the bottom yoke 62 to the base 4. In this embodiment, the bottom yoke 62 is fixed to the base 4 using two screws 70.

  FIG. 3 is a perspective view of the member main body of the bottom yoke 62. The horseshoe-shaped hole 62-a1 which is a feature of the present embodiment, and springs 62-b1, 62-b2 projecting into the horseshoe-shaped hole 62-a1 are shown. Is provided. Furthermore, the member main body of the bottom yoke 62 is provided with a mounting hole 62-d through which a screw 70 as a fixing member to the base 4 is passed.

  FIG. 4 is a perspective view of the base 4 in the present embodiment, and is a boss-like mounting base portion 4-a1, 4- for contacting the lower surface of the bottom yoke 62 when the member body of the bottom yoke 62 is attached. Protrusions 4-b1 and 4-b2 with which a2 and spring parts 62-b1 and 62-b2 provided on the member main body of the bottom yoke 62 abut are provided.

FIG. 5 is a front view of the attachment state of the member main body, which is the bottom yoke 62 in the present embodiment, as viewed from above. A magnet (magnet) 63 is mounted on the member main body which is the bottom yoke 62.
In the present embodiment, the member main body that is the bottom yoke 62, the spring portion 62-b1, and the magnet (magnet) 63 are collectively referred to as a yoke constituent member.
FIG. 6 is a cross-sectional view taken along the line AA of FIG. 5. It is a figure which shows the state which deform | transformed.

  As shown in FIGS. 5 and 6, in the yoke component in the present embodiment, the spring portion 62-b1 of the bottom yoke 62 is brought into contact with the protruding portion 4-b1 of the base 4 within the elastic deformation, and the arrow P The vibration of the direction is suppressed.

  According to the present embodiment, the amount of deformation of the spring portion 62-b1 varies depending on the dimensional error of the main body of the base 4 and the bottom yoke 62, but by changing the length and thickness of the spring portion 62-b1. The pressing force in the contact state and the bending amount of the spring part 62-b1 can be controlled, and both can always be brought into contact with each other by the elastic force of the spring part 62-b1.

  Further, even when the magnet 63 and the spring portion 62-b 1 are vertically overlapped, the surface of the spring portion 62-b 1 on the magnet 63 side is made lower than the upper surface 62-c of the bottom yoke 62, so The front end of the deformed spring portion 62-b 1 can be attached without interfering with the magnet (magnet) 63.

Note that the spring portion 62-b2 in FIG. 3 also maintains a contact state with the protrusion 4-b2 in FIG. 4 in the same manner as the above-described spring portion 62-b1, and suppresses vibration.
<Second Embodiment>
A second embodiment of the present invention will be described with reference to FIGS.
FIG. 7 shows a member main body that is the bottom yoke 92, which has a different spring shape from that of the first embodiment of the present invention. Specifically, the member main body that is the bottom yoke 92 protrudes outside from the outer shape of the member main body. Is provided with a spring portion 92-b protruding at the right end portion of the outer shape of the member main body which is the bottom yoke 92.

FIG. 8 shows a base 204 according to the second embodiment of the present invention, in which one protrusion 204-b is provided and the contact portion with the spring portion 92-b is flat.
FIG. 9 is a front view of the mounting state of the bottom yoke 92 according to the second embodiment of the present invention as seen from above. As in the first embodiment, the bottom yoke 92 is attached with two screws 70. The base 204 is fixed.

  FIG. 10 is a cross-sectional view taken along the line AA of FIG. 9, and the spring portion 92-b provided on the member main body that is the bottom yoke 92 is in contact with the protruding portion 204-b of the base 204 in an elastically deformed state. . Thereby, it becomes possible to suppress the vibration of the member main body which is the bottom yoke 92 as in the first embodiment.

  As described above, according to the present invention, the spring portion provided in the member main body of the yoke constituent member constituting the bottom yoke or the spring portion protruding toward the horseshoe-shaped hole provided in the member main body is the protruding portion of the base. Because it is elastically deformed by abutting on the yoke, it does not require unnecessary work such as screw adjustment, suppresses the vibration of the yoke member due to disturbance vibration or the vibration generated by the device itself, and enables stable carriage drive and reliability. It is possible to provide a high-yoke component member and a disk device.

1 is a front view showing the inside of a disk device according to an embodiment of the present invention. The perspective view explaining the attachment state of the bottom yoke which concerns on embodiment of this invention. The perspective view of the bottom yoke which concerns on embodiment of this invention. The perspective view of the base which is a base member which concerns on embodiment of this invention. The front view explaining the attachment state of the bottom yoke which concerns on embodiment of this invention. Sectional drawing explaining the attachment state of the bottom yoke which concerns on embodiment of this invention. The perspective view of the bottom yoke which concerns on the 2nd Embodiment of this invention. The perspective view of the base which is a base member which concerns on the 2nd Embodiment of this invention. The front view explaining the attachment state of the bottom yoke which concerns on the 2nd Embodiment of this invention. Sectional drawing explaining the attachment state of the bottom yoke which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Magnetic disk 2 ... Spindle motor 3 ... Carriage 4,204 ... Base 4-a, 204-a ... Base part 4-b, 204-b ... Projection part 5 ... Cover 60 ... Voice coil motor (VCM)
61 ... Top yoke 62 ... Bottom yoke (member body)
62-a ... Horseshoe-shaped hole 62-b ... Spring part 62-c ... Bottom yoke upper surface 62-d ... Mounting hole 63 ... Magnet (magnet)
70 ... Screw (fixing member)
92 ... Bottom yoke (member body)
92-a ... mounting hole 92-b ... spring part 70 ... screw (fixing member)

Claims (6)

A yoke component that can be attached to a disk device base,
A member body;
A spring portion provided in the member body;
And a magnet provided on the member main body. A yoke component that can be attached to a disk device base,
A member body having a horseshoe-shaped hole;
A spring portion protruding toward the horseshoe-shaped hole;
And a magnet provided on the member main body. The yoke component according to claim 1, wherein the spring portion protrudes outward from the member main body. A base having a mounting base and a protrusion;
A member main body that can be attached by contacting the mounting base portion of the base; a spring portion provided on the member main body; and a yoke component having a magnet provided on the member main body;
A disk device comprising: a fixing member that fixes the protruding portion of the base and the spring portion of the yoke component so that the spring portion is elastically deformed. A base having a mounting base and a protrusion;
A member main body having a horseshoe-shaped hole that can be mounted in contact with the mounting base part of the base, a spring part projecting toward the horseshoe-shaped hole, and a magnet provided on the member main body When,
A disk device comprising: a fixing member that fixes the protruding portion of the base and the spring portion of the yoke component so that the spring portion is elastically deformed. The disk device according to claim 4, wherein the spring portion protrudes outward from the member main body.

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