JP2011222096A - Actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an actuator capable of increasing a resonance frequency.SOLUTION: The actuator 1 includes: a comb 20 for the actuator; a coil 30 having the outer peripheral surface 31 of which at least a part is adhered to the comb 20 for the actuator; an inner support member 62 which is adhered to at least a part of the inner peripheral surface 32 of the coil 30; and a bridge member 64 disposed over an area from the inner support member 62 to the comb 20 for the actuator. The bridge member 64 is integrated with the inner support member 62 and fixed to the comb 20 for the actuator.

Description

  The present invention relates to an actuator, and more particularly to an actuator capable of increasing a resonance frequency.

  The actuator in the hard disk drive includes a comb (also referred to as an actuator arm) in which a pivot hole is formed, a magnetic head mounted on one end of the comb via a suspension, and a voice coil motor provided on the other side of the comb. The main structure. The coil of the voice coil motor is fixed to the other side of the comb.

  During the operation of the hard disk, the coil fixed to the comb is moved by the operation of the voice coil motor, so that the comb swings about the center of the pivot hole of the comb. Thus, the magnetic head mounted on the comb is moved to a desired position on the magnetic recording medium, and information recorded on the magnetic recording medium is recorded / reproduced by the moved magnetic head.

  Incidentally, in recent years, in order to perform high-speed recording / reproduction of information by a hard disk drive device, there has been a demand for higher performance of the actuator. It has been demanded. It is known that a higher resonance frequency of the actuator is better for swinging the actuator at high speed.

  Patent Document 1 below describes such an actuator. In this actuator, the coil is disposed between a pair of coil holding arms formed on the comb, and the coil is fixed to the comb by bonding the outer peripheral surface of the coil. An inner support member is disposed inside the coil, and the inner support member and the inner peripheral surface of the coil are bonded to each other. Such an internal support member reinforces the coil from the inner peripheral side of the coil, thereby improving the overall rigidity and increasing the resonance frequency of the actuator.

JP 2001-35098 A

  However, due to the recent improvement in performance of hard disk drives, an actuator having a higher resonance frequency is required. However, in the actuator described in Patent Document 1, since the internal support member is bonded only to the coil, there may be a relative displacement between the comb and the internal support member. In some cases, the resonance frequency does not increase as designed due to a relative positional shift.

  Therefore, an object of the present invention is to provide an actuator that can increase the resonance frequency.

  The actuator of the present invention includes an actuator comb, a coil to which at least a part of an outer peripheral surface is bonded to the actuator comb, and an internal support that is bonded to at least a part of the inner peripheral surface of the coil and reinforces the coil And a bridge member disposed from the internal support member to the actuator comb, the bridge member being integrated with the internal support member and fixed to the actuator comb. It is characterized by.

  According to such an actuator, since the coil is reinforced by the internal support member, the rigidity of the entire actuator comb to which the coil is fixed is improved. Furthermore, since the bridge member integrated with the internal support member is fixed to the actuator comb, the internal support member is prevented from being displaced relative to the actuator comb. Therefore, the actuator of the present invention can increase the resonance frequency as compared with an actuator having an internal support member fixed only to the coil.

  In the actuator, it is preferable that the internal support member and the bridge member are integrally molded.

  According to such an actuator, since the internal support member and the bridge member are integrally molded, there is no need for an adhesive or the like for integrating them, and the rigidity can be further improved and the weight can be improved. Can be lightened. Therefore, the resonance frequency can be further increased. In addition, since it is not necessary to prepare the internal support member and the bridge member separately and integrate them, it becomes easy to manufacture the actuator.

  In the actuator, the bridge member is preferably bonded to the coil.

  According to such an actuator, since the bridge member reinforces the coil, the rigidity between the bridge member and the coil can be improved. Therefore, the resonance frequency can be further increased.

  As described above, according to the present invention, an actuator capable of increasing the resonance frequency is provided.

It is a top view which shows the actuator which concerns on embodiment of this invention. It is an enlarged view which shows a mode that the coil of FIG. 1 is being fixed to the coil holding | maintenance part. It is a figure which shows the mode of the cross section in the III-III line | wire of FIG.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of an actuator according to the invention will be described in detail with reference to the drawings.

  FIG. 1 is a plan view showing an actuator for a hard disk according to the present invention.

  As shown in FIG. 1, the actuator 1 of this embodiment includes an actuator comb 20 (hereinafter referred to as a comb 20), a magnetic head 10 mounted on one side of the comb 20 via a suspension 11, and a comb. The coil 30 fixed to the other side of 20, a coil support member (stiffener) 60 that supports the coil 30, and a pair of magnets 50 that oppose each other and sandwich the coil 30 are provided as main components. In FIG. 1, only one of the pair of magnets 50 is shown for easy understanding.

  The comb 20 includes a bearing portion 21, a head holding arm 22 connected to one side surface 21a of the bearing portion 21, and a coil holding portion 23 connected to the other side surface 21b of the bearing portion 21. .

  The bearing portion 21 is made of a thick member. A pivot hole 25 penetrating along the thickness direction is formed substantially at the center.

  The head holding arm 22 connected to the side surface 21a on one side of the bearing portion 21 is composed of a plate material having an arm shape thinner than that of the bearing portion 21, and a pivot hole is formed from one side surface 21a of the bearing portion 21. 25 extends along a direction perpendicular to the central axis.

  The suspension 11 is connected to the tip of the head holding arm 22. The suspension 11 is made of a plate material that is thinner than the head holding arm 22. A magnetic head 10 in which a recording head and a reproducing head are integrated is mounted on the tip of the suspension 11.

  A plurality of head holding arms 22 may be connected to the bearing portion 21 so as to overlap in the thickness direction. In that case, the magnetic head 10 is mounted on the tip of each head holding arm 22 via the suspension 11.

  On the other hand, the coil holding portion 23 connected to the other side surface 21 b of the bearing portion 21 is made of a plate material having a pair of parallel surfaces that are thinner than the bearing portion 21. The coil holding portion 23 has a pair of coil holding arms 24 and 24 extending along a direction perpendicular to the central axis of the pivot hole 25 at a predetermined interval. The pair of coil holding arms 24, 24 are symmetrical to each other, and a line connecting the middle of the pair of coil holding arms 24, 24 is a line extending on the opposite side to the direction in which the head holding arm 22 extends.

  The coil 30 is fixed to the coil holding part 23. The coil 30 is an air-core coil in which conductive wires made of copper or the like are aligned and wound. Further, the coil 30 is hardened with a resin (not shown) so that the aligned and wound state is maintained. The thickness of the coil 30 is substantially the same as that of the coil holding portion 23.

  In addition, the bearing part 21, the head holding arm 22, and the coil holding part 23 constituting the comb 20 are each made of an aluminum alloy, so that the weight can be reduced while increasing the Young's modulus of the comb 20. To preferred. Thus, the resonance frequency of the actuator 1 using the comb 20 can be increased by reducing the weight while increasing the Young's modulus of the comb 20.

  In the comb 20, the bearing portion 21, the head holding arm 22, and the coil holding portion 23 may be composed of separate members, and the head holding arm 22 and the coil holding portion 23 may be connected to the bearing portion 21. Two or more members of the bearing portion 21, the head holding arm 22, and the coil holding portion 23 may be integrally formed.

  Next, how the coil 30 is fixed to the coil holding part 23 will be described. FIG. 2 is an enlarged view showing a state where the coil 30 of FIG. 1 is fixed to the coil holding portion 23, and FIG. 3 is a view showing a cross-sectional view taken along line III-III of FIG.

  As shown in FIGS. 2 and 3, the coil 30 has a coil outer peripheral surface 31 and a coil inner peripheral surface 32. The coil 30 is disposed such that the coil outer peripheral surface 31 is sandwiched between a pair of coil holding arms 24 and 24 formed in the coil holding portion 23, and the coil facing surface 26 of the coil holding portion 23 and the coil are arranged. A part of the outer peripheral surface 31 is fixed by an adhesive 40.

  In addition, a coil support member 60 is fixed to the coil 30 with an adhesive 40. The coil support member 60 includes an internal support member 62 and a bridge member 64 that are integrated by integral molding.

  The internal support member 62 has a substantially plate shape, and is formed with an opening 65 for the purpose of reducing the weight. Further, the entire inner peripheral surface of the internal support member 62 is opposed to the coil inner peripheral surface 32, and is a coil facing surface 62a. And the coil inner peripheral surface 32 and the coil opposing surface 62a are adhere | attached with the adhesive agent 40, and the coil 30 is reinforced.

  Each of the bridge members 64 has a thin plate-like shape, and includes a first member 66 and a second member 67 that are perpendicular to each other, and includes an end portion of the first member 66 and a second member 67. Is connected to the end of the. The first member 66 of the bridge member 64 and the internal support member 62 are partially overlapped, and the bridge member 64 and the internal support member 62 are connected and integrated in the overlapped portion. .

  Further, the bridge member 64 is arranged such that the first member 66 crosses a part of the coil 30 and passes from the internal support member 62 to the comb 20. Specifically, the first member 66 extends from the internal support member 62 to the vicinity of the boundary between the coil holding portion 23 and the bearing portion 21, and a part of one surface 66a of the first member 66 is a coil. The other part of the one surface 66 a of the first member 66 faces the coil 30 so as to face the one surface 23 a of the holding portion 23. A part of the first member 66 and the coil holding part 23 are bonded by an adhesive (not shown), and another part of the first member 66 and the coil 30 are bonded by the adhesive 40. The second member 67 is disposed along the side surface 21b of the bearing portion 21, and the second member 67 and the side surface 21b of the bearing portion 21 are bonded by an adhesive (not shown). In this way, the bridge member 64 is fixed to the comb 20.

  As shown in FIG. 1, the coil 30 fixed to the coil holding portion 23 is arranged so that the air core of the coil 30 is perpendicular to the coil-side surface of each magnet 50 between the pair of magnets 50. Has been placed. Thus, the coil 30 and the pair of magnets 50 constitute a voice coil motor (VCM).

  As described above, according to the actuator 1 in the present embodiment, since the coil 30 is reinforced by the internal support member 62, the rigidity of the comb 20 as a whole to which the coil 30 is fixed is improved. Furthermore, since the bridge member 64 integrated with the internal support member 62 is fixed to the comb 20, the internal support member 62 is restrained from being displaced relative to the comb 20, and the internal support member 62 is supported. The rigidity of the member 62 with respect to the comb 20 is improved. Therefore, the actuator 1 of the present embodiment can increase the resonance frequency as compared with an actuator having an internal support member fixed only to the coil.

  Moreover, according to the actuator 1 of this embodiment, since the internal support member 62 and the bridge member 64 are integrally molded, an adhesive or the like for integrating them is unnecessary, and the rigidity is further improved. And can reduce the weight. Therefore, the resonance frequency can be further increased.

  Further, since the bridge member 64 is bonded to the coil 30, the bridge member 64 further reinforces the coil. Therefore, the rigidity of the bridge member 64 and the coil 30 can be improved.

  In addition, when manufacturing the actuator 1, the coil 30 and the coil support member 60 are prepared first. Then, the bonding between the coil inner peripheral surface 32 and the internal support member 62 and the bonding between the bridge member 64 and the coil 30 are performed simultaneously. Thus, the coil 30 and the coil support member 60 are fixed to each other. Next, the comb 20 is prepared. The coil outer peripheral surface 31 is sandwiched between the pair of coil holding arms 24, 24 so that the coil outer peripheral surface 31 and the coil opposing surface 26 face each other, and the second member 67 of the bridge member 64 and the bearing portion 21 The coil 30 and the comb 20 to which the coil support member 60 is fixed are arranged so as to face the side surface 21b. The coil outer peripheral surface 31 and the coil facing surface 26 of the comb 20 are bonded by the adhesive 40, and a part of the first member 66 of the bridge member 64, the coil holding portion 23, the second member 67, and the bearing. The side surface 21b of the part 21 is bonded with an adhesive. In this way, the comb 20 to which the coil 30 shown in FIG. 2 is fixed is obtained.

  Next, the suspension 11 to which the magnetic head 10 is fixed is prepared, and the prepared suspension 11 is connected to the head holding arm 22 of the comb 20. In order to connect the suspension 11 to the head holding arm 22, for example, the suspension 11 and the head holding arm 22 may be spot-welded.

  Next, a pair of magnets 50 and 50 are installed on both sides of the coil 30 using a fixture (not shown). Thus, the actuator 1 shown in FIG. 1 is obtained.

  According to the actuator 1 of the present embodiment, since the internal support member 62 and the bridge member 64 are integrally molded, the internal support member 62 and the bridge member 64 are separately prepared and integrated. Since no work is required, the actuator 1 can be easily manufactured.

  As described above, the actuator of the present invention has been described by taking the embodiment as an example, but the present invention is not limited thereto.

  Further, in the above embodiment, the inner support member 62 is configured such that the entire outer peripheral surface is the coil facing surface 62a and the entire outer peripheral surface is bonded to the coil inner peripheral surface 32, but the entire outer peripheral surface is not necessarily the coil. For example, a part of the outer peripheral surface of the internal support member 62 and a part of the coil inner peripheral surface 32 may be bonded within a range in which the coil is reinforced.

  In the above embodiment, the internal support member 62 and the bridge member 64 are integrally formed by integral molding. However, the internal support member 62 and the bridge member 64 are not necessarily integrated by integral molding. It may be integrated by means.

  In the above embodiment, the bridge member 64 is bonded to the coil 30, but the bridge member 64 is not necessarily bonded to the coil 30.

  Moreover, each member which comprises the comb 20 may be comprised from materials other than an aluminum alloy, for example, may be comprised from titanium or a magnesium alloy.

  Further, the bearing portion 21 constituting the comb 20 is made of a thick material, and the head holding arm 22 and the coil holding portion 23 are made of a plate material thinner than the bearing portion 21. Each member which comprises may be comprised from the board | plate material of the mutually substantially same thickness. In this case, the second member 67 of the bridge member 64 is not necessary.

  According to the present invention, an actuator capable of increasing the resonance frequency is provided.

DESCRIPTION OF SYMBOLS 1 ... Actuator 10 ... Magnetic head 11 ... Suspension 20 ... Actuator comb 21 ... Bearing part 22 ... Head holding arm 23 ... Coil holding part 24 ... Coil holding arm 25 ... Pipot hole 26 ... Coil facing surface 30 ... Coil 31 ... Coil outer peripheral surface 32 ... Coil inner peripheral surface 40 ... Adhesive 50 ... Magnet 60 ... Coil support Member 62 ... Internal support member 64 ... Bridge member 66 ... First member 67 ... Second member

Claims (3)

An actuator comb;
A coil to which at least a part of an outer peripheral surface is bonded to the actuator comb;
An internal support member that is bonded to at least a part of the inner peripheral surface of the coil and reinforces the coil;
A bridge member disposed across the actuator comb from the internal support member;
With
The bridge member is integrated with the internal support member and fixed to the actuator comb.   The actuator according to claim 1, wherein the internal support member and the bridge member are integrally molded.   The actuator according to claim 1, wherein the bridge member is bonded to the coil.

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