KR20070024953A - Actuator and hard disk drive employing the same - Google Patents

Abstract

An actuator and an HDD(Hard Disc Drive) adopting the same are provided to accurately control a clearance between a disc and a disc recording surface by restraining clamping modification accompanied to a head stack assembly. At least two or more arm members(121,141) are mutually and horizontally extended. A spacer(130), inserted between the arm members(121,141) to closely adhere to the arm members(121,141), uniformly maintains an interval between the arm members(121,141). A stepped difference part(131) is formed in the spacer(130) to be faced and contacted with the arm members(121,141). A pivot member(110) passes through holes(121',130',141') formed in the arm members(121,141) and the spacer(130). The pivot member(110), connected as one laminated body with the arm members(121,141) and the spacer(130), provides the rotary center of the laminated body. A nut member(153), combined to an end part of the pivot member(110) by a screw, clamps and couples the arm members(121,141) and the spacer(130) together with the pivot member(110). The stepped difference part(131) has a contact surface of a ring shape.

Description

Actuator and hard disk drive employing the same

1 is a view showing the structure of a hard disk drive according to a preferred embodiment of the present invention.

2 is an exploded perspective view illustrating the actuator of FIG. 1 and illustrates a structure of an actuator according to a preferred embodiment of the present invention.

3a and 3b are views showing the arrangement of the flange according to the present invention and a comparative example, respectively.

4 is a view showing a cross-sectional structure of the actuator shown in FIG.

FIG. 5 is an enlarged cross-sectional view of portion V of FIG. 4.

6A and 6B are experimental results of measuring deformation amounts of the first arm member and the second arm member, respectively.

7 is an exploded perspective view showing an actuator according to the prior art.

<Brief description of the major symbols in the drawings>

10: hard disk drive 11: frame

15: spindle motor 17: magnet

20: disk 100: actuator

110: pivot member 111: flange portion

111a: cut portion of the flange portion 111b: non-cut portion of the flange portion

117: sleeve 119: bearing member

111aa: Cutting surface 121: First arm member

123,143: Suspension 125,145: Slider

130: spacer 131: stepped portion

133: coil support 135: chamfer processing

137: voice coil 153: nut member

180: pivot axis 121`, 130`, 141`: through hole

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator and a hard disk drive having the same, and more particularly, to an actuator of an improved structure that prevents deformation of a head stack assembly as a support structure of a head, and a hard disk drive having the same. It is about.

A hard disk drive as an information storage device of a computer is a device for recording information on a disc or reproducing and outputting information recorded on the disc using a magnetic head. The hard disk is provided with an actuator for mounting the magnetic head and moving the magnetic head to a predetermined position on the disk while turning on the disk.

7 is an exploded perspective view of the actuator 210 according to the prior art. The illustrated actuator 210 includes a first arm member 221, a second arm member 241, and a spacer 230 interposed between the arm members 221 and 241 stacked in parallel in the vertical direction. A pivot member 210 is provided which is inserted into the through holes 221 ′, 230 ′, and 241 ′ formed in the arm members 221, 241 and the spacer 230, respectively, and couples them into a single stack structure. do. An end portion of the pivot member 210 is provided with a threaded portion 215 having a shape to mate with the nut member 253 aligned below, and is fastened to the nut member 253, thereby pivoting the pivot member 210, more specifically, the pivot member 210. Arm members 221 and 241 interposed between the flange portion 211 of the member and the nut member 253 are clamped therebetween. That is, the upper first arm member 221 is compressed between the flange portion 211 and the spacer 230 of the pivot member, and the second arm member 241 is sandwiched between the spacer 230 and the nut member 253. Squeezed. Meanwhile, a washer 251 may be further interposed between the second arm member 241 and the nut member 253. The voice coil 237 wound up a predetermined number of times is supported on one side of the spacer 230, and a magnet facing the voice coil 237 is provided in a housing not shown. Controlled current is communicated to the voice coil 237, and by the interaction of the voice coil 237 and the magnet, the actuator is pivoted about the pivot member 210 in a clockwise or counterclockwise direction.

On the other hand, the arm members 221 and 241, which receive the local clamping force from the flange portion 211 or the nut member 253 of the pivot member, are bent or deformed upward or downward along the longitudinal direction, or warpage. ) Are vulnerable. As a result, the magnetic head which is responsible for the actual recording and reproduction does not form an optimum clearance with the disk recording surface, which causes the data transfer speed of the magnetic head and the accuracy of the data to deteriorate. In addition, if the clearance between the magnetic head and the recording surface is not properly secured, the magnetic head directly impacts the recording disk due to unexpected vibration or disturbance, resulting in mutual damage and deterioration of the reliability of the product.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems and other problems. The present invention provides an improvement in that the play between the head and the disc recording surface is precisely controlled by suppressing the clamping deformation associated with the head stack assembly. It is an object of the present invention to provide an actuator having a structured structure and a hard disk drive having the same.

In order to achieve the above object, the actuator according to an aspect of the present invention,

In order to move the head to a predetermined position on the disc, the actuator is mounted to the tip of the head and pivotally driven,

At least two arm members extending in parallel to each other;

A spacer interposed between the arm members to maintain a constant distance therebetween, the spacer having a step portion provided to face the arm members;

A pivot member configured to pass through through holes provided in each of the stacked arm members and the spacer to be combined into one stack and provide a center of rotation thereof; And

It is screwed to the end of the pivot member, a nut member for clamping the arm member and the spacer together with the pivot member;

The stepped portion is characterized by having an annular annular contact surface.

On the other hand, the actuator according to another aspect of the present invention,

In order to move the magnetic head to a predetermined position on the disk, the magnetic head is mounted on the distal end thereof, and is provided as a pivotable actuator.

At least two arm members extending in parallel to each other;

A spacer interposed between the arm members to maintain a constant distance therebetween, the spacer having a stepped portion protruding to a predetermined height so as to face the arm members;

A pivot member configured to pass through through holes provided in each of the stacked arm members and the spacer to be combined into one stack and provide a center of rotation thereof; And

It is screwed to the end of the pivot member, a nut member for clamping the arm member and the spacer together with the pivot member;

At least a portion of the edge formed on the stepped portion is characterized in that the chamfering processing unit is provided.

On the other hand, the actuator according to another aspect of the present invention,

In order to move the magnetic head to a predetermined position on the disk, the magnetic head is mounted on the distal end thereof, and is provided as a pivotable actuator.

At least two arm members extending in parallel to each other;

A spacer interposed between the arm members to maintain a constant gap therebetween, the spacer having a stepped portion facing the arm members;

A pivot member configured to pass through through holes provided in each of the stacked arm members and the spacer to be combined into one stack and provide a center of rotation thereof; And

It is screwed to the end of the pivot member, a nut member for clamping the arm member and the spacer together with the pivot member;

The stepped portion may be formed along a circumferential shape surrounding the perforation.

On the other hand, the hard disk drive according to another aspect of the present invention,

A hard disk drive including a frame on which a disk as a recording medium is mounted, and an actuator rotatably mounted on one side of the frame to move a magnetic head of the tip to a predetermined position on the disk.

The actuator is

At least two arm members extending in parallel to each other;

A spacer provided between the arm members in close contact with each other to maintain a constant gap therebetween, and having a stepped portion in contact with the arm members;

A pivot member configured to pass through through holes provided in each of the stacked arm members and the spacer to be combined into one stack and provide a center of rotation thereof; And

It is screwed to the end of the pivot member, a nut member for clamping the arm member and the spacer together with the pivot member;

The stepped portion is characterized by having an annular annular contact surface.

On the other hand, the hard disk drive according to another aspect of the present invention,

A hard disk drive including a frame on which a disk as a recording medium is mounted, and an actuator rotatably mounted on one side of the frame to move a head of the tip to a predetermined position on the disk.

The actuator is

At least two arm members extending in parallel to each other;

A spacer interposed between the arm members to maintain a constant distance therebetween, the spacer having a stepped portion protruding to a predetermined height so as to face the arm members;

A pivot member configured to pass through through holes provided in each of the stacked arm members and the spacer to be combined into one stack and provide a center of rotation thereof; And

It is screwed to the end of the pivot member, a nut member for clamping the arm member and the spacer together with the pivot member;

At least a portion of the edge formed on the stepped portion is characterized in that the chamfering processing portion is provided.

Hereinafter, an actuator according to a preferred embodiment of the present invention and a hard disk drive employing the same will be described with reference to the accompanying drawings. 1 is a structural diagram showing a schematic structure of a hard disk drive according to an embodiment of the present invention. The illustrated hard disk drive 10 includes a disk 20 in which a predetermined number of sheets are stacked as a recording medium, a box-shaped frame 11 that provides a space in which the disk 20 is accommodated, and an upper end of the frame 11. It includes a sealing member 13 for closing the. The disk 20 is a recording medium that can be repeatedly used while predetermined data is recorded or deleted. A representative example is a magnetic disk that stores data in a magnetic form.

The disk 20 is mounted to the spindle motor 15 fixedly installed on the frame 11, and rotates at high speed together with the spindle motor 15, wherein a plurality of disks are provided according to the storage capacity of the hard disk drive 10. In this case, several disks 20 are coaxially stacked on the spindle motor 15.

The actuator 100, which is driven in a clockwise or counterclockwise direction on the disk 20 rotated by the spindle motor 15, moves approximately in the radial direction of the disk 20, thereby accessing the target track of the disk 20. The data is recorded on the disk 20 or the recorded data is read. A magnetic head (not shown) is mounted at the distal end of the actuator 100 so as to face the recording surface of the disk 20, and the magnetic head records or records the disk while floating at a predetermined height from the recording surface. Play the data.

The actuator 100 is mounted to pivot about a pivot shaft 180 protruding from the bottom of the frame 11, and is connected to an actuation or stop signal transmitted from a flexible printed circuit 160 connected to one side thereof. Therefore, the disk enters the loading state and becomes a loading state, or is separated from the disk outward to the unloading state. The flexible cable 160 receives a controlled drive signal or power from a circuit board (not shown) disposed under the frame 11. For this purpose, the flexible cable 160 is connected to the circuit board at a corner of the frame 11. The bracket 161 is installed to mediate.

The actuator 100 includes an arm member 121 on one side and a voice coil 137 on the other side with respect to the pivot shaft 180 serving as the rotation center. A suspension 123 extending in the longitudinal direction is attached to one end of the arm member 121, although not shown, a magnetic head is attached to one end of the suspension 123, and the magnetic head is a suspension 123. Is elastically biased with respect to the disc recording surface.

On the other hand, the other side of the actuator 100 is supported by the voice coil 137 wound a predetermined number of times, as a predetermined current is applied to the induction magnetic field is formed around the voice coil 137. The magnet 17 is fixedly installed on the frame 11 facing the voice coil 137. The magnet 17 interacts with the voice coil 137 in which the induction magnetic field is formed, thereby rotating the actuator 100 in a clockwise or Turn counterclockwise. In this way, the voice coil 137 and the magnet 17 constitute a main part of the voice coil motor for providing a driving force to the actuator 100. Although not shown in the drawings, the mark net interacting with the voice coil 137 may be fixedly installed on the upper cover 13 side facing the voice coil 137.

2 is an exploded perspective view of the actuator shown in FIG. 1. The illustrated actuator 100 includes plate members 121, 130 and 141 stacked up and down, and the plate members 121, 130 and 141 are pivot members 110 penetrating them and a nut member screwed to the pivot member 110. 153 is clamped in close contact with each other. More specifically, the actuator 100 includes first and second arm members 121 and 141 spaced parallel to each other, and a spacer 130 interposed between the arm members 121 and 141, respectively. Through holes 121 ′, 130 ′, and 141 ′ through which the pivot member 110 is inserted are provided at 121, 130, and 141, and the through holes 121 ′, 130 ′, and 141 ′ are fitted on the same axis. The members 121, 130, and 141 are arranged to overlap each other around the through holes 121 ′, 130 ′, and 141 ′.

The first arm member 121 and the second arm member 141 correspond to the recording surface provided on the upper side of the disk and the recording surface provided on the lower side, respectively, according to the number of disks provided in the hard disk drive. Is prepared in the corresponding number.

A spacer 130 is disposed between the first and second arm members 121 and 141 to maintain a constant gap therebetween, and an upper side of a disk to which the first and second arm members 121 and 141 correspond. The spacers 130 have a thickness corresponding to the discs so that they respectively extend to the lower recording surface. A stepped portion 131 is provided between the arm members 121 and 141 between the through holes 130 ′ of the spacer 130 to support the arm members 121 and 141, which will be described in detail later. . Meanwhile, a coil support 133 is provided adjacent to the stepped portion 131, and a voice coil 137 wound several times along a groove drawn to a predetermined depth is supported by the coil support 133. The voice coil 137 provides a driving force to the actuator 100 through interaction with the magnet provided on the frame.

The pivot member 110 includes a hollow sleeve 117 surrounding the pivot shaft 180 of the frame at a predetermined radius and a bearing member 119 interposed between the sleeve 117 and the pivot shaft 180. . As the bearing member 119 mediates between both 117 and 180, the head stack assembly pivoted with the sleeve 117 can be rotatably supported on the pivot axis 180. The bearing member 119 may be configured as a journal bearing of a known structure such as a ball bearing, and detailed description of the structure and operation will be omitted.

The sleeve 117 may include a body portion 113 inserted into the through holes 121 ′ and 141 ′ of the arm member, a flange portion 111 having a large diameter provided on an upper side of the body portion 113, and a body. It may be provided in a multi-stage structure including a small diameter screw 115 provided on the lower side of the portion 113. The flange portion 111 has a structure protruding in the radial direction from the outer periphery of the body portion 113, the flange portion 111 of this structure faces the periphery of the through-hole 121` of the first arm member 121 The clamping force is applied to the arm member 121 while being in contact.

The screw portion 115 provided on the opposite side of the flange portion 111 is formed by stepping inward from the body portion 113, and the outer circumferential surface is formed with a screw having a shape that matches the nut member 153 aligned below. . The pivot member 110 which penetrates the arm members 121 and 141 is fastened to the nut member 153 through its threaded portion 115, and the arm members 121 and 141 and the spacer 130 are in a single stack structure. ) Are combined. Meanwhile, a washer 151 may be interposed between the nut member 153 and the second arm member 141.

Arm members 121 and 141 and spacers 130 forming a stacked structure are interposed between the pivot member 110 and the nut member 153 which are screwed up and down, by the flange part 111 and the nut member 153. Arm members 121 and 141 and the spacer 130 between them are pressed against each other in a compressed state by the clamping force provided. Circular through holes 121 ′, 130 ′, and 141 ′ are respectively drilled in the first and second arm members 121 and 141 and the spacers 130 with a predetermined radius to allow the pivot member 110 to pass therethrough. The fields 121 ′, 130 ′, and 141 ′ may have a radius slightly smaller than the outer circumference of the sleeve 113, and may be tightly coupled to the sleeve 113.

Suspensions 123 and 143 are attached to distal ends of the first and second arm members 121 and 141 in the longitudinal direction. At one end of the suspensions 123 and 143, sliders 125 and 145 attached to the disk recording surface facing each other are elastically supported, which are elastically biased with respect to the recording surface of the disk by the suspensions 123 and 143. The sliders 125 and 145 elastically supported by the suspensions 123 and 143 are the lift force acting in a direction away from the surface of the disk by the rotation of the disk during the operation of the hard disk drive, and the elastic force directed toward the disk by the suspensions 123 and 143. At the height of the balance of this force, the state is suspended while maintaining a constant gap.

The sliders 125 and 145 are equipped with magnetic heads (not shown) for reading and reproducing data. The magnetic heads perform magnetic interaction with the disks while being raised to a predetermined height from the surface of the disks. That is, the magnetic head reads the data by generating an electrical output signal from the magnetized recorded data, or records the data by magnetizing a predetermined area of the disk through the electrical input signal. A pair of magnetic heads disposed face up and down face each side of the disc in accordance with the driving of the actuator, so as to read the recorded data or write to the disc. Meanwhile, the arm members 121 and 141 are provided in a predetermined number corresponding to the number of disks provided in the hard disk drive. For example, in the embodiment shown in FIG. 2, one arm is provided. Two members 121 and 141 are provided corresponding to one surface of the disk and the other surface of the disk.

The spacer 130 is provided with an annular annular stepped portion 131 so as to surround the through hole 130 ′ through which the pivot member 110 is inserted, and the stepped portion 131 includes first and second arms. It is preferable that both the upper and lower surfaces of the spacer 130 facing the members 121 and 141 are formed. The stepped portion 131 protrudes to a predetermined height so as to face the arm members 121 and 141 and the contact surface forms the same level so as to be in contact with the arm members 121 and 141 at the same time. The stepped portion 131 is formed to be stepped upward from another region adjacent thereto, that is, the edge portion 139 protruding in the extending direction of the arm members 121 and 141 and the coil support 133 in the opposite direction.

In the present invention, the stepped portion 131 of the spacer 130 is provided in a circumferential shape so as to be symmetrical with respect to the central axis of the pivot member 110 in order to alleviate the bending or distortion of the arm members 121 and 141. That is, in the prior art illustrated in FIG. 7, the stepped surfaces 231 in contact with the arm members 221 and 241 form an asymmetrical support structure with respect to the pivot center axis, thereby causing a bending deformation in the arm members 221 and 241. . In order to solve this problem, in the present invention, the stepped portion 131 is formed in a circumferential shape having a substantially constant width, so that the contact areas of the stepped portions 131 in contact with the arm members 121 and 141 are approximately equal in all directions. It can be maintained so that the deformation of the arm members 121 and 141 can be minimized. However, although the stepped portion 131 illustrated in FIG. 2 is provided in a perfect annular ring shape, the technical scope of the present invention is not limited thereto, and in consideration of the load distribution applied to the arm member, it is partially along the circumferential shape. It should be noted that the present invention can be applied substantially the same even when the step portions having different widths are provided.

On the other hand, the flange portion 111 of the pivot member 110 preferably has a shape close to the circular shape in order to clamp at a uniform pressure symmetrical about the pivot center axis, but does not form a complete circle, the outer periphery A portion is removed to form a cutting surface 111aa having a flat surface. The cut surfaces 111aa are formed in pairs so as to form planes parallel to each other, which are provided on the flange portion 111 for ease of screwing operation. That is, in the assembling process of the actuator, the first and second arm members 121 and 141 are sequentially stacked in the state of having the spacer 130 interposed therebetween, and then pass through the through holes 121 ′, 130 ′, and 141 ′. Screw the pivot member 110 and the nut member 153. At this time, the cutting surface 111aa of the pivot member 110 is gripped by a screw spanner having a shape corresponding thereto, so that the fastening operation can be easily performed without slipping.

3A and 3B show the arrangement of the flanges in the present invention and the comparative example, respectively. In the present invention shown in Fig. 3A, the pair of cut surfaces 111aa facing each other are aligned to be approximately parallel to the extending direction of the arm member. Since the cutout portion 111a having the cut surface 111aa as the side and the non-cutout portion 111b having the arcuate outer circumferential surface as the side have a generally perpendicular angle relationship with each other, the non-cut portion 111b is approximately in the longitudinal direction of the arm member. And the cut portions 111a are vertically aligned thereto.

As described above, the pivot member 110 penetrating the laminated structure clamps the members 121, 130, and 141 therebetween together with the nut member 153, and faces the flange portion 111 of the pivot member 110. The first arm member 121, which is subjected to local clamping force, tends to bend upward in the opposite direction of clamping as a repulsion. At this time, in the present invention, the non-cutting portion 111b having a relatively wide contact surface presses the arm member 121 in the longitudinal direction, thereby suppressing bending deformation. However, in the comparative example shown in Fig. 3B, since the cut portions 111a` having the side surfaces 111aa` cut in the longitudinal direction of the arm member are arranged, the bending deformation of the arm member cannot be corrected.

On the other hand, the chamfered processing unit 135 is provided on the upper and lower surfaces forming the main surface of the stepped portion 131 and a portion of the circumferential edge formed in contact with the outer circumferential surface. That is, as can be seen in Figure 2, the chamfering processing unit 135 is provided at a portion of the corner where the upper surface and the outer peripheral surface meet, and the processing portion may be provided in the same shape in the corner portion where the lower surface and the outer peripheral surface not shown.

The chamfered processing part 135 may be formed along the outer periphery of the edge as a whole, or may be provided on a front side of the arm members 121 and 141 as a part thereof, as an example, as shown in FIG. 2. Since the provision of a symmetrical support structure for the arm members 121 and 141 is advantageous for the prevention of warpage, the chamfering part is approximately equal in length to both left and right sides based on the length direction of the arm members 121 and 141. It is preferable to form over. The chamfering portion contributes to suppressing the bending deformation of the arm member, which will be described in detail below.

4 schematically illustrates the cross-sectional structure of the actuator of FIG. 5. Referring to this, a local clamping force is applied to the arm members 121 and 141 by the pivot member 110 or the nut member 153 which presses the rear end thereof, and the step members 131 supporting the arm members 121 and 141. The repulsive pressure is then applied in the opposite direction. As a result, the arm members 121 and 141 are bent and deformed upward or downward from the pivot member 110 along the longitudinal direction thereof, and the first arm member 121 is upward and the second arm member 141 is downward. Tends to bend.

FIG. 5 is an enlarged cross-sectional view of portion V of FIG. 4. Referring to this, the first arm member 121 has a first pressing surface 121a which is in contact with the flange portion 111 of the pivot member at one surface (upper surface), and the step portion 131 at the other surface (lower surface). And a second pressing surface 121b which is in contact with the surface of the second pressing surface 121b, and the chamfering processing unit 135, a part of which is cut, is formed in the stepped portion 131, so that the second pressing surface 121b is smaller than the first pressing surface 121a. It has a small contact area. That is, as shown in FIG. 5, the distance L2 from the pivot center axis to the end of the second pressing surface 121b is shorter than the distance L1 from the pivot center axis to the end of the first pressing surface 121a. Due to this, the arm members 121 and 141 tend to be deflected toward the stepped portion 131 which is relatively weak in support, that is, downward, which is opposite to the tendency of bending due to local clamping. As a result, the arm member 121 forms a flat surface at substantially the same level.

On the other hand, the chamfering processing unit 135 is provided in a round shape having a predetermined curvature, as shown in Figure 5, or may be provided in an angular tapered shape for ease of processing, the technical scope of the present invention It is not limited by the shape of the negative. In addition, the chamfering processing unit 135 may be provided in any direction along the outer circumferential side edge of the stepped part 130, and as shown in FIG. 2, the arm members 121 and 141 do not have to be formed at the front side where the arm members 121 and 141 extend. According to the design, it may be provided at a position that satisfies the optimum condition that the bending of the arm member can be suppressed.

6A and 6B show experimental results for confirming the effect of the present invention. 6A and 6B show the results of measuring the vertical displacement amount of the first arm member and the second arm member, wherein profile A shown in each figure is a vertical displacement amount in a conventional structure, and profile B is provided with a stepped portion of a spacer in a circumferential shape. The vertical displacement amount, profile C, according to the exemplary embodiment of the present invention is a result of measuring the vertical displacement amount in another embodiment of the present invention, in which the chamfered portion is formed at the corner of the stepped portion, in addition to the circumferential stepped portion.

In the drawings, Point 1, Point 2, and Point 3 represent three measurement points each selected along the longitudinal direction of the arm member, with Point 1 at the tip (suspension side) of the arm member and Point 3 at the arm member. It is a measuring point located at the rear end (through hole side) of Point 2, and Point 2 is a measuring point spaced a predetermined distance from the tip of the arm member between Point 1 and Point 3.

The amount of vertical displacement may be defined as the distance moved vertically through the deformation from the imaginary reference line extending horizontally. In the case of the first arm member disposed on the upper side, the positive sign is In the case of the 2nd arm member arrange | positioned at the lower side, the positive sign was attached when it shifted further downward.

As a result of the measurement, the vertical displacement amount tends to increase from the rear end through which the pivot member penetrates along the longitudinal direction of the arm member to the front end, and is common in both the present invention and the comparative example. , The second arm member is the result of the bending deformation downward. However, the difference in vertical displacement limiting the minimum displacement amount from the maximum displacement amount, that is, the deformation amount of the arm member is relatively less in the case of the present invention than the prior art, which means that the bending deformation of the arm member is considerably improved. It can be seen that the improvement effect of the present invention is doubled when the chamfering processing portion is also provided in addition to the stepped portion of.

According to the actuator of the present invention and the hard disk drive provided with the same, the bending deformation of the head stack assembly of the actuator is prevented, so that the play between the magnetic head and the disc recording surface supported thereon can be precisely controlled. . As a result, data transmission speed and accuracy may be improved, and a certain clearance may be secured, thereby preventing damage to the head due to disturbance, thereby improving reliability of the product. In addition, since it is not necessary to precisely adjust the clamping force of the pivot member in order to prevent deformation in the assembly process of the head laminate structure, the ease and productivity of the assembly process is increased.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (23)

In order to move the head to a predetermined position on the disc, the actuator is mounted to the tip of the head and pivotally driven, At least two arm members extending in parallel to each other; A spacer interposed between the arm members to maintain a constant distance therebetween, the spacer having a step portion provided to face the arm members; A pivot member configured to pass through through holes provided in each of the stacked arm members and the spacer to be combined into one stack and provide a center of rotation thereof; And It is screwed to the end of the pivot member, a nut member for clamping the arm member and the spacer together with the pivot member; And the stepped portion has an annular annular contact surface. The method of claim 1, And the stepped portion is formed along a circumferential shape surrounding the through hole. The method of claim 2, Actuator, characterized in that the contact surface of the step portion is changed in width along the circumference of the through-hole. The method of claim 1, And the stepped portion protrudes to a predetermined height so as to be in contact with the arm member, and the contact surface forms substantially the same level to be in contact with the arm member at the same time. The method of claim 1, At least a portion of the outer peripheral side edge of the stepped portion actuator, characterized in that the chamfering portion is formed. The method of claim 5, The chamfering actuator is characterized in that the angular tapered shape. The method of claim 5, The chamfering actuator is characterized in that it has a round shape of a predetermined curvature. The method of claim 5, The chamfering actuator is formed on the front side in the longitudinal direction in which the arm member extends. The method of claim 1, The pivot member includes a body portion inserted into the through holes and a flange portion protruding radially from the body portion to clamp the periphery of the through hole. The method of claim 9, And the flange portion has a cutting disc shape having at least one flat side. The method of claim 10, And the flange portion is divided into a cut portion having a flat side surface and a non-cut portion having a spherical side surface according to its side shape, and the non-cut portion is disposed along the longitudinal direction of the arm member. The method of claim 10, And the flange portion is provided with two flat sides parallel to each other. The method of claim 9, The arm member is squeezed between the flange portion of the pivot member and the stepped portion of the spacer, and has a first pressurized surface facing the flange portion and a second pressurized surface facing the stepped portion. The area of the 1st pressing surface is larger than the area of the 2nd pressing surface actuator. The method of claim 13, And the distance from the pivot center axis to the end of the first pressing surface along the longitudinal direction of the arm member is longer than the distance from the pivot center axis to the end of the second pressing surface. The method of claim 1, And a coil support for supporting a voice coil wound a predetermined number of times adjacent to the stepped portion. In order to move the magnetic head to a predetermined position on the disk, the magnetic head is mounted on the distal end thereof, and is provided as a pivotable actuator. At least two arm members extending in parallel to each other; A spacer interposed between the arm members to maintain a constant distance therebetween, the spacer having a stepped portion protruding to a predetermined height so as to face the arm members; A pivot member configured to pass through through holes provided in each of the stacked arm members and the spacer to be combined into one stack and provide a center of rotation thereof; And It is screwed to the end of the pivot member, a nut member for clamping the arm member and the spacer together with the pivot member; At least a part of the corner formed in the stepped portion actuator, characterized in that the chamfering processing portion is provided. The method of claim 16, And the stepped portion is formed along a circumferential shape surrounding the through hole, and the chamfering processing portion is provided at an edge of the outer peripheral side of the stepped portion. The method of claim 16, The chamfering actuator is formed on the front side in the longitudinal direction in which the arm member extends. The method of claim 16, The chamfering actuator is characterized in that it has an angular tapered shape or a round shape of a predetermined curvature. In order to move the magnetic head to a predetermined position on the disk, the magnetic head is mounted on the distal end thereof, and is provided as a pivotable actuator. At least two arm members extending in parallel to each other; A spacer interposed between the arm members to maintain a constant gap therebetween, the spacer having a stepped portion facing the arm members; A pivot member configured to pass through through holes provided in each of the stacked arm members and the spacer to be combined into one stack and provide a center of rotation thereof; And It is screwed to the end of the pivot member, a nut member for clamping the arm member and the spacer together with the pivot member; And the stepped portion is formed along a circumferential shape surrounding the through hole. The method of claim 20, And the stepped portion has an annular annular contact surface whose width varies around the through hole. A hard disk drive including a frame on which a disk as a recording medium is mounted, and an actuator rotatably mounted on one side of the frame to move a magnetic head of the tip to a predetermined position on the disk. The actuator is At least two arm members extending in parallel to each other; A spacer provided between the arm members in close contact with each other to maintain a constant gap therebetween, and having a stepped portion in contact with the arm members; A pivot member configured to pass through through holes provided in each of the stacked arm members and the spacer to be combined into one stack and provide a center of rotation thereof; And It is screwed to the end of the pivot member, a nut member for clamping the arm member and the spacer together with the pivot member; And the stepped portion has an annular annular contact surface. A hard disk drive including a frame on which a disk as a recording medium is mounted, and an actuator rotatably mounted on one side of the frame to move a head of the tip to a predetermined position on the disk. The actuator is At least two arm members extending in parallel to each other; A spacer interposed between the arm members to maintain a constant distance therebetween, the spacer having a stepped portion protruding to a predetermined height so as to face the arm members; A pivot member configured to pass through through holes provided in each of the stacked arm members and the spacer to be combined into one stack and provide a center of rotation thereof; And It is screwed to the end of the pivot member, a nut member for clamping the arm member and the spacer together with the pivot member; Hard disk drive, characterized in that the chamfering portion is provided on at least a portion of the corner formed in the stepped portion.

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