JP2011248940A - Actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an actuator whose oscillation frequency can be made high.SOLUTION: The actuator 1 includes: an actuator comb 20; a coil 30 in which at least one of lead wires 35a and 35b is led out from an inner peripheral surface side thereof and at least one part of an outer peripheral surface is adhered to the actuator comb 20; an internal support member 62 which is adhered to at least one part of the inner peripheral surface of the coil 30 and reinforces the coil 30; and a lead wire guide body 63 which is extended from the internal support member 62 to the actuator comb 20 and is integrally formed with the internal support member 62. The lead wire guide body 63 regulates the movement of the lead wire 35a leading out from the inner peripheral surface side of the coil 30 at least at positions overlapping with the coil 30.

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 this 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 fixed to the comb, and the coil support member is fixed to the inner periphery of the coil. And a part of this coil support member is extended to the outer peripheral side of the coil, and the lead wire guide body integrally molded with the coil support member is provided on the outer peripheral side of the coil. This lead wire guide body fixes the lead wire of a coil in the outer peripheral side of a coil. Such a coil support member reinforces the coil from the inner peripheral side of the coil, and the coil support member and the lead wire guide body are integrally molded, thereby improving the overall rigidity and reducing the resonance frequency of the actuator. It is high.

JP 2003-223766 A

  In the actuator described in Patent Document 1, the lead wire is fixed to a lead wire guide body provided on the outer peripheral side of the coil. However, since the lead wire led out from the inner peripheral side of the coil crosses the coil from the inner peripheral side to the outer peripheral side and is fixed to the lead wire guide body, this lead wire is connected to the coil from the inner peripheral side. In the section crossing to the outer peripheral side, that is, the section overlapping with the coil, no movement is restricted. Therefore, in the actuator described in Patent Document 1, there is a problem that the lead wire led out from the inner peripheral side of the coil fluctuates in a section overlapping with the coil and lowers the resonance frequency of the actuator.

  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 in which at least one of the lead wires is led out from the inner peripheral surface side, and at least a part of the outer peripheral surface is bonded to the actuator comb, and the inner portion of the coil. An internal support member that is bonded to at least a part of the peripheral surface and reinforces the coil, and a lead wire guide body that is disposed from the internal support member to the actuator comb and integrated with the internal support member The lead wire guide body regulates the movement of the lead wire led out from the inner peripheral surface side of the coil at least at a position overlapping with the coil.

  According to such an actuator, since the internal support member is bonded to the coil, the coil is reinforced, and the lead wire guide body and the internal support member are integrated, the overall rigidity can be increased. Then, at least at a position overlapping with the coil, the lead wire guided from the inner peripheral side of the coil can be wired in a state in which movement is restricted by the lead wire guide body. Therefore, it is possible to prevent the lead wire from fluctuating during the operation of the actuator. As described above, according to the actuator of the present invention, it is possible to increase the overall rigidity and to prevent the lead wire from wobbling, and thus it is possible to increase the resonance frequency.

  In the actuator, it is preferable that the lead wire guide body extends to a side opposite to a portion of the actuator comb where the coil is bonded.

  According to such an actuator, the lead wire can be wired to the outside of the actuator comb in a state where the movement of the lead wire is regulated.

  In the actuator, it is preferable that a groove into which the lead wire enters is formed in the lead wire guide body.

  According to such an actuator comb, the movement of the lead wire can be easily regulated by inserting the lead wire into the groove.

  Furthermore, in the actuator, the groove is preferably formed in a linear shape.

  According to such an actuator comb, since the lead wire can be pulled straight and inserted into the groove, the lead wire can be easily inserted into the groove.

  In the actuator, the lead wire is preferably bonded to the lead wire guide body.

  According to such an actuator, the overall rigidity can be further increased, and the resonance frequency can be further increased.

  In the actuator, it is preferable that the internal support member and the lead wire guide body are integrally molded.

  According to such an actuator, since the internal support member and the lead wire guide body are integrally molded, an adhesive or the like for integrating them is unnecessary. Accordingly, the rigidity can be further increased and the weight can be reduced, so that the resonance frequency can be further increased. In addition, since it is not necessary to prepare the internal support member and the lead wire guide body separately and integrate them, it becomes easy to manufacture the actuator.

  In the actuator, the lead wire guide body is preferably bonded to the comb.

  According to such an actuator, since the lead wire guide body is reinforced by the actuator comb, the rigidity of the lead wire guide body and the actuator comb can be further increased. Therefore, the resonance frequency can be further increased.

  In the actuator, the lead wire guide body is preferably bonded to the coil.

  According to such an actuator, since the lead wire guide body and the coil reinforce each other, the rigidity of the lead wire guide body and the coil can be increased. 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 of the bearing portion 21, and a coil holding portion 23 connected to the other side surface 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 one side surface of the bearing portion 21 is formed of a plate material having an arm shape thinner than the bearing portion 21, and the central axis of the pivot hole 25 from the side surface of the bearing portion 21. It extends along the direction perpendicular to.

  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 of the bearing portion 21 is composed 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 wound in an aligned manner. From the inner peripheral side of the coil 30, the wire is led out as a lead wire 35 a, and the outer peripheral side The lead is led out to be a lead wire 35b. Further, the coil 30 is hardened with a resin (not shown) so that the lead wires 35a and 35b are thus led out and maintained in an aligned winding state. 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 that is integrated by integral molding and a lead wire guide body 63.

  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.

  The lead wire guide body 63 includes a bottom portion 66 that has a plate-like shape elongated in a straight line, and side walls 67a and 67b that are formed perpendicular to the bottom portion 66 at both edges along the length direction of the bottom portion 66. A straight groove 68 is formed by the bottom 66 and the pair of side walls 67a and 67b. The lead wire guide body 63 is arranged across the coil 30 from the internal support member 62 to the coil holding portion 23 of the comb 20. The bottom 66 is connected to the internal support member 62 on one end side of the lead wire guide body 63, and the other end side of the lead wire guide body 63 is opposite to the portion of the comb 20 where the coil 30 is bonded. The other end is not connected to anything and is a free end.

  Further, the portion of the bottom 66 that overlaps the coil 30 is bonded to the coil 30 by the adhesive 40, and the lead wire guide body 63 and the coil 30 are reinforced. Further, the portion of the bottom 66 that overlaps the comb 20 is bonded to the coil holding portion 23 with an adhesive (not shown), and the lead wire guide body 63 is reinforced by the comb 20.

  Further, one side wall 67a is notched around the inner periphery of the coil 30, and the lead wire 35a is inserted into the groove 68 from this notch. Further, the other side wall 67 b is notched around the outer periphery of the coil 30, and the lead wire 35 b is inserted into the groove 68 from this notch. The groove 68 is filled with the adhesive 40, and the lead wires 35 a and 35 b are fixed to the lead wire guide body 63. Thus, the movements of the respective lead wires 35a and 35b are restricted. The lead wires 35a and 35b inserted in the groove 68 are wired to the other end of the lead wire guide body 63 and further led out from the other end.

  2 is slanted with respect to the longitudinal direction of the lead wire guide body 63, the cross-sectional shape of the lead wire 35a appears to be elliptical in FIG.

  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, the internal support member 62 is bonded to the coil 30 to reinforce the coil 30, and the lead wire guide body 63 and the internal support member 62 are integrated. Therefore, the overall rigidity can be increased. The lead wire 35a led out from the inner peripheral side of the coil 30 can be wired in a state where movement is restricted by the lead wire guide body 63 at least at a position overlapping with the coil 30. Accordingly, it is possible to prevent the lead wire 35a from fluctuating during the operation of the actuator 1. As described above, according to the actuator 1 of the present invention, the overall rigidity can be increased, and further, the wobbling of the lead wire 35a can be prevented, so that the resonance frequency can be increased.

  In addition, since the lead wire guide body 63 extends to the side opposite to the portion of the comb 20 where the coil 30 is bonded, the lead wires 35a, 35b, 35b can be wired to the outside of the comb 20.

  In addition, since the lead wires 35 a and 35 b are bonded to the lead wire guide body 63, the actuator 1 has an overall rigidity compared to the case where the lead wires 35 a and 35 b are not bonded to the lead wire guide body 63. Can be further increased, and the resonance frequency can be further increased.

  Further, since the internal support member 62 and the lead wire guide body 63 are integrally molded, an adhesive or the like for integrating them is not necessary. Therefore, the actuator 1 can have higher rigidity and light weight, so that the resonance frequency can be further increased.

  Moreover, since the lead wire guide body 63 is reinforced by the comb 20, the rigidity between the lead wire guide body 63 and the comb 20 can be further increased, and the actuator 1 can have a higher resonance frequency.

  Further, since the lead wire guide body 63 and the coil 30 are reinforced, the rigidity of the lead wire guide body 63 and the coil 30 can be increased, and the actuator 1 can further increase the resonance frequency. .

  In addition, when manufacturing the actuator 1, the coil 30 and the coil support member 60 are prepared first. The coil inner peripheral surface 32 and the internal support member 62 are bonded together, and the lead wire guide body 63 and the coil 30 are bonded simultaneously. At this time, since the internal support member 62 and the lead wire guide body 63 are integrally molded, it is not necessary to prepare the internal support member 62 and the lead wire guide body 63 separately and integrate them. Thus, the coil 30 and the coil support member 60 are fixed to each other. Next, the lead wire 35a led out from the inner peripheral side of the coil 30 is inserted into the groove 68 from the notch of the side wall 67a. Similarly, the lead wire 35b led out from the outer peripheral side of the coil 30 is inserted into the groove 68 from the notch of the side wall 67b. At this time, since the groove 68 is formed linearly, the lead wire 35a can be easily inserted into the groove 68. By thus inserting the lead wires 35a and 35b into the groove 68, the movement of the lead wires 35a and 35b can be easily regulated. By restricting the movement of the lead wires 35a and 35b, it is possible to prevent the lead wires 35a and 35b from being disconnected in the subsequent work. Next, the groove 68 is filled with the adhesive 40 and the lead wires 35 a and 35 b are fixed to the lead wire guide body 63.

  Next, the comb 20 is prepared. Then, the coil 30 and the comb 20 to which the coil support member 60 is fixed so that the coil outer peripheral surface 31 is sandwiched between the pair of coil holding arms 24 and 24 and the coil outer peripheral surface 31 and the coil opposing surface 26 face each other. Place. The coil outer peripheral surface 31 and the coil facing surface 26 of the comb 20 are bonded by an adhesive 40, and a part of the lead wire guide body 63 and the coil holding portion 23 are bonded by an adhesive (not shown). 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.

  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.

  For example, in the above embodiment, the lead wire 35b is led out from the outer peripheral side of the coil, but both the lead wires 35a and 35b may be led out from the inner peripheral side of the coil 30. In this case, the notch of the side wall 67b is provided on the inner peripheral side of the coil 30, and the lead wire 35b may be inserted into the groove 68 through this notch.

  Further, in the above embodiment, the groove 68 is filled with the adhesive 40 and the lead wires 35 a and 35 b are bonded to the lead wire guide body 63, but the lead wires 35 a and 35 b are not necessarily attached to the lead wire guide body 63. It does not need to be bonded. Even in this case, the movement of the lead wires 35 a and 35 b is restricted by the side walls 67 a and 67 b of the lead wire guide body 63.

  Moreover, in the said embodiment, although the lead wire guide body 63 is set as the structure in which the groove | channel 68 was formed, another structure may be sufficient. For example, the lead wire guide body 63 has a cylindrical shape in which a through hole is formed, and the lead wires 35a and 35b pass through the through hole, thereby restricting the movement of the lead wires 35a and 35b. It is also good.

  Further, the lead wire guide body 63 does not necessarily have to extend to the outside of the comb 20.

  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 30 is reinforced.

  In the above embodiment, the internal support member 62 and the lead wire guide body 63 are integrally formed by integral molding. However, they are not necessarily integrated by integral molding. These may be integrated.

  Further, in the above embodiment, the lead wire guide body 63 is bonded to the coil 30 and the coil holding portion 23 of the comb 20, but the lead wire guide body 63 is not necessarily bonded to the coil 30 and the coil holding portion 23. There is no need to be done.

  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.

  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 35a, 35b ... Lead wire 40 ... Adhesive 50 ... Magnet 60: Coil support member 62 ... Internal support member 63 ... Lead wire guide body 66 ... Bottom 67a, 67b ... Side wall 68 ... Groove

Claims (8)

An actuator comb;
A coil in which at least one of the lead wires is led out from the inner peripheral surface side, and at least a part of the 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 lead wire guide body disposed from the internal support member to the actuator comb and integrated with the internal support member;
With
The actuator, wherein the lead wire guide body restricts the movement of the lead wire derived from the inner peripheral surface side of the coil at least at a position overlapping with the coil.   2. The actuator according to claim 1, wherein the lead wire guide body extends to a side opposite to a portion of the actuator comb to which the coil is bonded.   The actuator according to claim 1, wherein a groove into which the lead wire enters is formed in the lead wire guide body.   The actuator according to claim 3, wherein the groove is formed in a linear shape.   The actuator according to any one of claims 1 to 4, wherein the lead wire is bonded to the lead wire guide body.   The actuator according to any one of claims 1 to 5, wherein the internal support member and the lead wire guide body are integrally molded.   The actuator according to any one of claims 1 to 6, wherein the lead wire guide body is bonded to the comb.   The actuator according to any one of claims 1 to 7, wherein the lead wire guide body is bonded to the coil.

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