JP2012014794A - Head gimbal assembly and disk device provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a head gimbal assembly and a disk device for suppressing rock of flexure by wind disturbance and improving head positioning precision.SOLUTION: According to an embodiment, a head gimbal assembly 30 for a disk device includes: a load beam 34a; a base plate 42 fixed to a distal end part of the load beam; a head supported by the load beam via a gimbal; a piezoelectric device 50 which is provided in the base plate and rocks the load beam; a flexure 40 which has wiring electrically connected to the head and the piezoelectric device, is attached to the load beam, and is extended outside the load beam; and a flexure support part 44 which is extended from at least either the base plate or the load beam, is opposite to the extended part of the flexure, and is fixed to the flexure with an adhesive.

Description

  Embodiments described herein relate generally to a head gimbal assembly used in a disk device, and a disk device including the head gimbal assembly.

In recent years, disk devices such as magnetic disk devices and optical disk devices have been widely used as external recording devices and image recording devices for computers.
As a disk device, for example, a magnetic disk device generally includes a magnetic disk disposed in a case, a spindle motor that supports and rotates the magnetic disk, and a head gimbal assembly (HGA) that supports the magnetic head. The head gimbal assembly includes a suspension attached to the tip of the arm, a magnetic head supported by the suspension, a flexure (wiring trace) that is installed on the load beam and pulled out from the load beam, The flexure wiring is electrically connected to the magnetic head. The suspension has a load beam and a base plate fixed to the base end side of the load beam, and the base plate is fixed to the distal end portion of the arm.

  In recent years, an HGA in which a piezoelectric material is arranged on a base plate has been provided. When a voltage is applied to the piezoelectric material, the piezoelectric material operates in a direction in which the load beam bonded to the base plate is swung, and the magnetic head attached to the load beam can be moved. By controlling the voltage applied to the piezoelectric material, the operation of the magnetic head can be controlled.

JP 2002-279613 A JP 2002-74871 A

  In the HGA as described above, the flexure is formed of a thin laminated plate, and is drawn from the load beam to the side of the arm. The flexure is greatly affected by wind generated by the rotation of the magnetic disk due to its thinness. That is, the flexure may be shaken by wind disturbance, and the entire suspension may vibrate and the positioning accuracy of the magnetic head may deteriorate.

  The present invention has been made in view of the above points, and an object thereof is to provide a head gimbal assembly and a disk device capable of suppressing flexure shake due to wind disturbance and improving head positioning accuracy. is there.

  According to the embodiment, the head gimbal assembly is provided on the load beam, a base plate fixed to a base end portion of the load beam, a head supported by the load beam via a gimbal, and the base plate, A piezoelectric element for swinging a load beam; a wiring electrically connected to the head and the piezoelectric element; a flexure attached to the load beam and extending to the outside of the load beam; the base plate; A flexure support portion that extends from at least one of the load beams, faces the extension portion of the flexure, and is fixed to the flexure with an adhesive.

FIG. 1 is a perspective view showing a hard disk drive (HDD) according to a first embodiment with a top cover removed. FIG. 2 is a perspective view showing a head gimbal assembly of the HDD. FIG. 3 is a plan view showing the head gimbal assembly. FIG. 4 is a perspective view showing the head gimbal assembly of the HDD according to the second embodiment. FIG. 5 is a perspective view showing a head gimbal assembly of an HDD according to a third embodiment. FIG. 6 is a plan view showing a magnetic head side of a head gimbal assembly of an HDD according to a third embodiment.

  Hereinafter, a hard disk drive (HDD) according to a first embodiment will be described in detail as a magnetic disk device with reference to the drawings. FIG. 1 shows the internal structure of the HDD with the top cover removed. As shown in FIG. 1, the HDD includes a housing 10. The housing 10 includes a rectangular box-shaped base 12 having an open top surface and a top cover (not shown) that is screwed to the base with a plurality of screws to close the upper end opening of the base. The base 12 has a rectangular bottom wall 12a and side walls 12b erected along the periphery of the bottom wall.

  In the housing 10, there are provided two magnetic disks 16 as recording media, and a spindle motor 18 as a drive unit for supporting and rotating the magnetic disks. The spindle motor 18 is disposed on the bottom wall 12a. Each magnetic disk 16 is formed with a diameter of 65 mm (2.5 inches), for example, and has a magnetic recording layer on the upper surface and the lower surface. The magnetic disk 16 is coaxially fitted to a hub (not shown) of the spindle motor 18 and is clamped by a clamp spring 27 to be fixed to the hub. As a result, the magnetic disk 16 is supported in a state positioned parallel to the bottom wall 12 a of the base 12. The magnetic disk 16 is rotated by the spindle motor 18 at a predetermined speed, for example, 10,000 rpm or 7200 rpm.

  Within the housing 10 are a plurality of magnetic heads 17 for recording and reproducing information with respect to the magnetic disk 16, and a head stack assembly (hereinafter referred to as HSA) in which these magnetic heads are movably supported with respect to the magnetic disk 16. 22) is provided. Further, in the housing 10, when the voice coil motor (hereinafter referred to as VCM) 24 for rotating and positioning the HSA 22 and the magnetic head 17 are moved to the outermost periphery of the magnetic disk 16, the magnetic head is separated from the magnetic disk. A ramp load mechanism 25 that holds the unloading position, a latch mechanism 26 that holds the HSA in the retracted position when an impact or the like acts on the HDD, and a substrate unit 21 having a preamplifier and the like are provided.

  A printed circuit board (not shown) is screwed to the outer surface of the bottom wall 12a of the base 12. The printed circuit board controls operations of the spindle motor 18, the VCM 24, and the magnetic head 17 through the board unit 21. On the side wall of the base 12, a circulation filter 23 that captures dust generated in the housing by the operation of the movable part is provided and is located outside the magnetic disk 16. Further, a breathing filter 15 that captures dust from the air flowing into the housing 10 is provided on the side wall of the base 12.

  FIG. 2 is a perspective view showing the HSA 22. As shown in FIGS. 1 and 2, the HSA 22 includes a rotatable bearing unit 28, four head gimbal assemblies (hereinafter referred to as HGA) 30 attached to the bearing unit 28 in a stacked state, and an HGA. Are provided with spacer rings (not shown) that are respectively stacked.

  The bearing unit 28 has a pivot that is erected on the bottom wall 12a of the base 12 in the vicinity of the outer peripheral edge of the magnetic disk 16, and a cylindrical sleeve that is rotatably supported by the pivot via a bearing. .

  FIG. 2 is a perspective view showing the HGA 30, and FIG. 3 is a plan view showing the magnetic head side of the HGA 30. As shown in FIGS. 1, 2, and 3, each HGA 30 includes an arm 32 extending from the bearing unit 28, a suspension 34 extending from the arm, and a magnetic head 17 supported on the extended end of the suspension. is doing.

  The arm 32 is formed in an elongated flat plate shape, for example, of stainless steel or aluminum. The arm 32 has a distal end portion on the extending end side, and a caulking seat surface having a caulking hole (not shown) is formed at the distal end portion. The suspension 34 includes an elongated leaf spring-shaped load beam 34a, a gimbal 36 attached to the extending end side of the load beam, and a substantially rectangular base plate 42 fixed to the base end portion of the load beam 34a. Have. The magnetic head 17 is fixed on the gimbal 36 and supported by the load beam 34a via the gimbal 36.

  The base plate 42 integrally has an annular protrusion 43 at the center thereof, and the protrusion 43 protrudes to one surface side of the base plate. In the present embodiment, the base plate 42 is fixed to the load beam 34a on the surface on which the protruding portion 43 protrudes, and the protruding portion 43 protrudes from the load beam through an opening formed at the base end portion of the load beam. Yes.

  The base plate 42 is fixed to the distal end portion of the arm 32 together with the proximal end portion of the load beam 34a. For example, the base plate 42 is fastened to the arm 32 by fitting the projection 43 into a caulking hole (not shown) formed in the arm 32 and caulking the projection 43, and the caulking seat surface 35 of the arm 32. It is fixed on the top. As a result, the suspension 34 is fixed to the tip of the arm 32 and extends from the arm 32.

  As shown in FIGS. 2 and 3, openings 48 functioning as mounting portions are formed on both side portions of the end portion of the base plate 42 on the load beam side. Piezoelectric elements 50 functioning as piezoelectric materials are disposed in these openings 48 and are fixed in the openings 48 by an adhesive 52. Each piezoelectric element 50 expands and contracts along the longitudinal direction of the suspension 34 as shown by an arrow in FIG. By selectively driving these two piezoelectric elements 50, the load beam 34a can be swung and the magnetic head 17 can be displaced.

  As shown in FIGS. 2 and 3, the suspension 34 has a wiring trace (flexure) 40 provided on the gimbal 36 and the load beam 34a. The flexure 40 includes a metal thin plate such as stainless steel as a base, an insulating layer formed on the metal thin plate, a wiring pattern constituting a plurality of wirings 40a formed on the insulating layer, and a protective layer covering the wiring pattern And has an elongated strip-like laminate. The flexure 40 is attached or pivot welded to the load beam 34a on the thin metal plate side. The end of the thin metal plate on the suspension 34 side is also formed as a gimbal 36. The wiring 40 a of the flexure 40 is electrically connected to the magnetic head 17. A part of the wiring 40 a of the flexure 40 has drive pads 41 extending left and right, and these drive pads 41 are electrically connected to the piezoelectric elements 50, respectively. A voltage is applied to each piezoelectric element 50 through the flexure 40 and the drive pad 41.

  The flexure 40 is pulled out from the load beam 34 a and extends along the arm 32 to the vicinity of the bearing unit 28. The connection end of the flexure 40 is connected to a main FPC 21b described later. Thereby, the magnetic head 17 is electrically connected to the main FPC 21 b and the substrate unit 21 through the flexure 40.

  As shown in FIGS. 2 and 3, the base plate 42 of the HGA 30 integrally includes a flexure support portion 44 that extends to the extension portion side of the flexure 40. The flexure support portion 44 is formed in a rectangular shape, for example, and has a width substantially equal to the flexure 40 and a length that is more than half of the length of the base plate 42. The flexure support portion 44 faces the extension portion of the flexure 40 substantially in parallel. Further, the flexure support portion 44 is bonded to the extension portion of the flexure 40 with an adhesive 52. The adhesive 52 is the same as the adhesive 52 that fixes the piezoelectric element 50. Thereby, the extension part of the flexure 40 is supported and fixed to the flexure support part 44, and shaking and vibration due to wind turbulence are prevented.

  On the other hand, the HSA 22 has a support frame extending from the bearing unit 28 in the direction opposite to the arm 32, and a voice coil constituting a part of the VCM 24 is embedded in the support frame. As shown in FIG. 1, in a state in which the HSA 22 configured as described above is incorporated on the base 12, the bearing unit 28 is fixed to the base 12 at the lower end of the pivot and is substantially parallel to the spindle of the spindle motor 18. Is erected. Each magnetic disk 16 is located between two HGAs 30. During the operation of the HDD, the magnetic head 17 attached to the suspension 34 faces the upper surface and the lower surface of the magnetic disk 16 and sandwiches the magnetic disk from both sides. The voice coil fixed to the support frame is positioned between a pair of yokes 37 fixed on the base 12, and constitutes the VCM 24 together with these yokes and a magnet (not shown) fixed to one of the yokes.

  As shown in FIG. 1, the board unit 21 has a main body 21 a formed of a flexible printed circuit board, and the main body 21 a is fixed to the bottom wall 12 a of the base 12. Electronic parts (not shown) such as a head amplifier are mounted on the main body 21a. A connector (not shown) for connecting to the printed circuit board is mounted on the bottom surface of the main body 21a.

  The board unit 21 has a main flexible printed circuit board (hereinafter referred to as main FPC) 21b extending from the main body 21a. The extension end of the main FPC 21b forms a connection end and is fixed in the vicinity of the bearing unit 28 of the HSA 22. The flexure 40 of each HGA 30 is mechanically and electrically connected to the connection end of the main FPC 21b. Thereby, the substrate unit 21 is electrically connected to the magnetic head 17 and the piezoelectric element 50 via the main FPC 21b and the flexure 40.

  As shown in FIG. 1, the ramp loading mechanism 25 includes a ramp 45 disposed outside the magnetic disk 16 on the bottom wall 12a of the base 12, and a tab 46 extending from the tip of each suspension 34 (see FIGS. 3). When the HSA 22 rotates around the bearing unit 28 and the magnetic head 17 moves to the retracted position outside the magnetic disk 16, each tab 46 engages with the ramp surface formed on the ramp 45. Raised by the slope of the surface. As a result, the magnetic head 17 is unloaded from the magnetic disk 16 and held at the retracted position.

  According to the HDD and HGA 30 configured as described above, the piezoelectric element 50 is provided on the base plate 42, and the voltage is applied to the piezoelectric element 50 through the flexure 40, thereby swinging the load beam 34 a joined to the base plate 42. Can be operated in the direction of Accordingly, the magnetic head 17 attached to the load beam 34a can be displaced. Thereby, by controlling the voltage applied to the piezoelectric element 50, the position of the magnetic head 17 attached to the load beam 34a can be finely controlled, and the positioning accuracy of the magnetic head can be improved. In addition, a flexure support portion 44 is provided on the base plate 42, and an extension portion of the flexure 40 is fixed to the flexure support portion with an adhesive 52. Thereby, even when the flexure 40 receives wind generated by the rotation of the magnetic disk 16, the flexure 40 can be prevented from shaking and vibrating, and the vibration of the entire suspension can be reduced. As a result, it is possible to improve the positioning accuracy of the magnetic head.

Next, another embodiment will be described.
FIG. 4 shows a head gimbal assembly of an HDD according to the second embodiment. As shown in FIG. 4, according to the second embodiment, the base plate 42 of the HGA 30 integrally includes a substantially rectangular flexure support portion 44 that extends toward the extension portion of the flexure 40. The flexure support portion 44 is provided at the base end side of the base plate 42, that is, at the end portion on the arm side. The flexure support portion 44 faces the extension portion of the flexure 40 substantially in parallel, and is fixed to the extension portion of the flexure 40 by an adhesive 52.

In the second embodiment, the other configuration of the HGA 30 is the same as that of the HGA of the first embodiment described above, and the same reference numerals are given to the same parts, and detailed description thereof is omitted.
According to the HGA and the HDD according to the second embodiment, the flexure 40 is supported and fixed by the flexure support portion 44, thereby suppressing the shake and vibration of the flexure 40 due to wind disturbance and vibration of the entire suspension. Can be reduced. As a result, it is possible to improve the positioning accuracy of the magnetic head. In addition, also in 2nd Embodiment, the effect similar to 1st Embodiment mentioned above can be acquired.

FIG. 5 is a perspective view showing a head gimbal assembly of an HDD according to the third embodiment, and FIG. 6 is a plan view showing the head gimbal assembly.
As shown in FIGS. 5 and 6, according to the third embodiment, the load beam 34 a of the HGA 30 extends to the extension portion side of the flexure 40 beyond the side edge of the base plate 42. The support portion 44 is integrally provided. The flexure support portion 44 faces the extension portion of the flexure 40 substantially in parallel, and is fixed to the extension portion of the flexure 40 by an adhesive 52.

In the third embodiment, other configurations of the HGA 30 are the same as those of the HGA of the first embodiment described above, and the same reference numerals are given to the same portions, and detailed descriptions thereof are omitted.
According to the HGA and the HDD according to the third embodiment, the flexure 40 is supported and fixed by the flexure support portion 44 formed on the load beam 34a, so that the flexure 40 is shaken and vibrated by wind disturbance. It can suppress and can reduce the vibration of the whole suspension. As a result, it is possible to improve the positioning accuracy of the magnetic head. In addition, also in 3rd Embodiment, the effect similar to 1st Embodiment mentioned above can be acquired.

  In addition, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  In the above-described embodiment, the flexure support portion is provided integrally with the base plate or the load beam. However, the flexure support portion may be provided on both the base plate and the load beam. In the above-described embodiment, the HGA arm is a plate-like arm that is independent from each other. However, the present invention is not limited to this, and an arm formed by integrating a plurality of so-called E-block arms and a bearing sleeve is applied. May be. The magnetic disk is not limited to 2.5 inches, and may be a magnetic disk of another size. The number of magnetic disks is not limited to two, but may be one or more, and the number of HGAs may be increased or decreased according to the number of installed magnetic disks.

10 ... Case, 12 ... Base, 16 ... Magnetic disk, 17 ... Magnetic head,
18 ... Spindle motor, 21 ... Substrate unit,
22 ... Head stack assembly (HSA),
30 ... Head gimbal assembly (HGA),
32 ... Arm, 34 ... Suspension, 34a ... Load beam, 36 ... Gimbal,
40 ... flexure, 42 ... base plate, 44 ... flexure support,
50 ... piezoelectric element, 52 ... adhesive

Claims (6)

Load beam,
A base plate fixed to the base end of the load beam;
A head supported by a gimbal on the load beam;
A piezoelectric element provided on the base plate for swinging the load beam;
A flexure having wiring electrically connected to the head and the piezoelectric element, attached to the load beam and extending to the outside of the load beam;
A flexure support portion that extends from at least one of the base plate and the load beam, faces the extension portion of the flexure, and is fixed to the flexure by an adhesive;
Head gimbal assembly with   The head gimbal assembly according to claim 1, wherein the flexure support portion is formed integrally with the base plate.   The head gimbal assembly according to claim 1, wherein the flexure support portion is formed integrally with the load beam.   The said piezoelectric element is adhere | attached on the said baseplate with the adhesive agent, and the said flexure support part is adhere | attached on the said flexure support part with the adhesive agent common to the said adhesive agent. Head gimbal assembly.   The head gimbal assembly according to claim 4, wherein the base plate has an opening, and the piezoelectric element is disposed in the opening and fixed to the opening and the load beam by the adhesive. A disk-shaped recording medium;
A drive motor that supports and rotates the recording medium;
A head stack assembly that supports a head that performs information processing on the recording medium so as to be movable with respect to the recording medium;
The head stack assembly includes a head gimbal assembly that supports a head. The head gimbal assembly is supported by a load beam, a base plate fixed to a base end portion of the load beam, and the load beam via a gimbal. And a piezoelectric element provided on the base plate for swinging the load beam, and a wiring electrically connected to the head and the piezoelectric element, and attached to the load beam and the load beam And a flexure support portion that extends from at least one of the base plate and the load beam, faces the extension portion of the flexure, and is fixed to the flexure with an adhesive. apparatus.

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