KR100660895B1 - Actuator and hard disk drive having the same - Google Patents

Actuator and hard disk drive having the same Download PDF

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Publication number
KR100660895B1
KR100660895B1 KR1020050115056A KR20050115056A KR100660895B1 KR 100660895 B1 KR100660895 B1 KR 100660895B1 KR 1020050115056 A KR1020050115056 A KR 1020050115056A KR 20050115056 A KR20050115056 A KR 20050115056A KR 100660895 B1 KR100660895 B1 KR 100660895B1
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KR
South Korea
Prior art keywords
protrusion
swing arm
magnet
actuator
magnetic pole
Prior art date
Application number
KR1020050115056A
Other languages
Korean (ko)
Inventor
김동욱
변용규
전정일
Original Assignee
삼성전자주식회사
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Application filed by 삼성전자주식회사 filed Critical 삼성전자주식회사
Priority to KR1020050115056A priority Critical patent/KR100660895B1/en
Priority claimed from JP2006278147A external-priority patent/JP4907290B2/en
Application granted granted Critical
Publication of KR100660895B1 publication Critical patent/KR100660895B1/en

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    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/4806Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed specially adapted for disk drive assemblies, e.g. assembly prior to operation, hard or flexible disk drives
    • G11B5/4813Mounting or aligning of arm assemblies, e.g. actuator arm supported by bearings, multiple arm assemblies, arm stacks or multiple heads on single arm
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00Head arrangements not specific to the method of recording or reproducing
    • G11B21/16Supporting the heads; Supporting the sockets for plug-in heads
    • G11B21/22Supporting the heads; Supporting the sockets for plug-in heads while the head is out of operative position
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00Magnets
    • H01F7/06Electromagnets; Actuators including electromagnets
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00Record carriers by type
    • G11B2220/20Disc-shaped record carriers
    • G11B2220/25Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2508Magnetic discs
    • G11B2220/2516Hard disks

Abstract

An actuator and an HDD(Hard Disc Drive) with the same are provided to improve a dynamic characteristic like the quickness of a response or driving efficiency by providing bias rotary force in a loading/unloading operation of the actuator. A suspension(133) to which a read/write head(134) for record and reproduction is attached is installed in a swing arm(132). The swing arm(132) is rotated and operated centering around a pivot axis. A coil supporting part(136) is combined to a rear end part of the swing arm(132), and is rotated together with the swing arm(132). A VCM(Voice Coil Motor) coil(137) is assembled in the coil supporting part(136). A magnet(150) is disposed in at least one of upper and lower sides to be faced with the VCM coil(137). At least one protrusion(141,142) is formed in the rear end part of the swing arm(132). The protrusion(141,142) is protruded toward the magnet(150), and is formed as a magnetic body. At least one protrusion shape part(158) is formed in the magnet(150). The protrusion shape part(158) is formed to be convex from a body of the magnet(150) to the protrusion(141,142) to supply bias rotary force to the protrusion(141,142).

Description

Actuator and hard disk drive having the same

1 is a perspective view showing a schematic structure of a hard disk drive according to the prior art.

2 is a plan view illustrating a hard disk drive according to an exemplary embodiment of the present invention.

FIG. 3A is a view showing the actuator shown in FIG. 2, in which a read / write head is loaded onto a disc. FIG.

FIG. 3B is a view showing the actuator shown in FIG. 2, in which an unloading operation is started and a read / write head starts to enter a ramp.

3C is a view showing the actuator shown in FIG. 2, in which the read / write head is parked in a lamp.

4 is a perspective view illustrating an arrangement state of a magnet in the actuator illustrated in FIG. 2.

FIG. 5 is a perspective view illustrating an arrangement state between a protrusion of a swing arm and a protrusion of a magnet in the actuator of FIG. 3B.

Figure 6 is a profile comparing the distribution of the bias rotational force acting on the swing arm according to the rotation angle of the swing arm in the actuator of the prior art and the present invention.

<Description of the symbols for the main parts of the drawings>

101: base member 102: cover member

110: disk 120: spindle motor

130: actuator 131: actuator pivot

132 swing arm 133 suspension

134 read / write head 135 end tab

136: coil support 137: VCM coil

141: first protrusion 142: second protrusion

150: magnet 150R: right pole

150L: left pole 155: yoke

158: projecting portion of the magnet 170: flexible cable

The present invention relates to an actuator and a hard disk drive having the same, and more particularly, to an actuator having an improved structure and a hard disk drive having the same, which improves the dynamic characteristics of loading / unloading and impact resistance against external impact. .

One of the computer's information storage devices, a hard disk drive (HDD) is a device that reads or writes data stored on a disc using a read / write head. . In such a hard disk drive, the head performs its function while being moved to a desired position by an actuator in a state in which the head rises a predetermined height from the recording surface of the rotating disk.

1 is a schematic perspective view showing the configuration of a conventional hard disk drive. Referring to FIG. 1, a hard disk drive includes a disk 10 for storing data, a spindle motor 20 for rotating the disk 10, and a read / write head 34 for recording and reproducing data. An actuator 30 is provided for moving to the desired position on the disk 10. The actuator 30 is provided with a swing arm 32 rotatably coupled to the actuator pivot 31 and a tip of the swing arm 32 to elastically bias the head 34 toward the surface of the disk 10. It has a suspension 33 which is so supported and a voice coil motor (VCM) for rotating the swing arm 32. The voice coil motor is disposed at the upper and lower portions of the VCM coil 37 coupled to the coil support 36 provided at the rear end of the swing arm 32 and the VCM coil 37 so as to face the VCM coil 37. Magnet 50 is provided.

The voice coil motor having the above-described configuration rotates the swing arm 32 in a direction in accordance with Fleming's left hand law by the interaction of the current input to the VCM coil 37 and the magnetic field formed by the magnet 50. . That is, when the power of the hard disk drive is turned on and the disk 10 starts to rotate at a constant angular velocity (Ω), the voice coil motor rotates the swing arm 32 in a predetermined direction, for example, counterclockwise to read. The write head 34 is moved onto the recording surface of the disc 10. The head 34 loaded onto the disk 10 is lifted a predetermined height from the surface of the disk 10 by the lifting force generated by the rotating disk 10. In this state, the head 34 follows the specific track T of the disc 10 and records data on the recording surface of the disc 10 or reproduces data stored on the recording surface of the disc 10.

On the other hand, when the power of the hard disk drive is turned off and the rotation of the disk 10 stops, the voice coil motor rotates the swing arm 32 in the opposite direction, for example clockwise. As a result, the head 34 is unloaded from the recording surface of the disk 10 and parked at the lamp 60 located at the outer side of the disk 10. Here, the end tab 35 is protruded at the end of the suspension 33, the end tab 35 is moved to a safe position on the outer surface of the lamp 60, the support provided in the lamp 60 Settles on the face.

In the rotational operation of the swing arm 32, a plurality of rotational resistances act on the swing arm 32. For example, rotational resistance applied by the actuator pivot 31, elastic bias resistance by the flexible cable 70 attached to the side of the swing arm 32, and also the surface of the lamp 60 and the end tab 35 ), And a magnetoresistance acting between the retreat ball (not shown) and the magnet 50 provided at the rear end of the coil support 36. In order to overcome these rotational resistances and the swing arm 32 to be rotated, the voice coil motor must supply sufficient rotational force to the swing arm 32, in particular, to satisfy the required dynamic characteristics such as quick response. In order to achieve this, the driving current applied to the voice coil 37 must be increased. In this case, the power consumption of the actuator 30 is increased and the driving efficiency is lowered.

The present invention has been made to solve the above-mentioned problems and other problems, the dynamic characteristics of the loading / unloading is improved, and in the case of an actuator and a hard disk drive having the same to improve the impact resistance against accidental impact in case of Its purpose is to provide.

In order to achieve the above object, the actuator of the hard disk drive according to an aspect of the present invention, the swing arm is attached to the front end with a suspension attached to the read / write head for recording and reproduction, the swing arm is rotated about the pivot axis And a coil support coupled to the rear end of the swing arm and rotated together with the swing arm, the coil support being assembled with the VCM coil and a magnet disposed on at least one side of the swing arm to face the VCM coil. The rear end is provided with at least one protrusion protruding toward the magnet and made of a magnetic material, and the magnet has at least one protrusion formed convexly from the main body of the magnet toward the protrusion to apply a bias rotational force to the protrusion. Characterized in that provided.

In the present invention, preferably, the bias rotational force is changed according to the separation distance between the protrusion of the swing arm and the protrusion of the magnet provided to correspond to each other.

In the present invention, preferably, the protruding portion and the protruding portion are mutually aligned such that the separation distance between the protruding portions and the protruding portions becomes the shortest when the read / write head enters the parking ramp.

On the other hand, a hard disk drive according to another aspect of the invention, the at least one or more information storage disk, the spindle motor to which the disk is inserted by rotating the disk and the read / write head for recording and reproduction A hard disk drive including an actuator for moving to a predetermined position on a disk, the actuator comprising: a swing arm mounted at a distal end with a suspension attached to a read / write head for recording and reproducing, and rotating around a pivot axis; It is coupled to the rear end of the swing arm and rotated together with the swing arm, and includes a coil support to which the VCM coil is assembled, and at least one side of the magnet disposed to face the VCM coil, and after the swing arm At least one end of the magnetic body protruding toward the magnet And the projection is provided, the magnet is characterized in that the at least one portion of the projecting shape formed convexly toward the projection from the body of the magnet provided to apply a bias rotary force about the projections.

Hereinafter, an actuator according to a preferred embodiment of the present invention and a hard disk drive having the same will be described with reference to the accompanying drawings. Figure 2 is a plan view showing a schematic structure of a hard disk drive according to an embodiment of the present invention. Referring to FIG. 2, the hard disk drive includes a spindle motor 120 for rotating the data storage disk 110 and a read / write head 134 for recording and reproducing data. Actuator 130 for moving to position.

The spindle motor 120 is installed on the base member 101 of the hard disk drive. The spindle motor 120 is equipped with one or a plurality of disks for data storage 110, and the disk 110 is rotated at a constant angular velocity Ω by the spindle motor 120.

The actuator 130 includes an actuator pivot 131 installed on the base member 101, a swing arm 132, a suspension 133, a read / write head 134, a coil support 136, Voice coil motor. The swing arm 132 is rotatably coupled to the actuator pivot 131. The suspension 133 is coupled to the distal end of the swing arm 132 to support the head 134 elastically biased toward the surface of the disk 110. The coil support 136 is assembled to the rear end of the swing arm 132.

The voice coil motor provides a driving force for rotating the swing arm 132. The voice coil motor is connected to the law of the left hand of Fleming by the interaction of a current input to the VCM coil 137 and a magnetic field formed by the magnet 150. The swing arm 132 is rotated in the following direction. The VCM coil 137 is assembled to the coil support 136. The magnet 150 is disposed above and below the VCM coil 137, respectively, and a yoke 155 is provided on the base member 101 as a supporting structure of the magnet 150. The magnet 150 has a shape along an arc of a predetermined curvature corresponding to the movement trajectory of the VCM coil 137 which is pivotally operated together with the swing arm 132. Here, the magnet 150 may be divided into a first magnetic pole 150L on the left and a second magnetic pole 150R on the right, which are roughly equally divided along the longitudinal direction, and the first magnetic poles disposed adjacent to each other. 150L and the second magnetic pole 150R are provided to have opposite polarities. The VCM coil 137 is placed in the magnetic flux space formed by the magnet 150, and rotates in the magnetic flux space clockwise or counterclockwise according to the direction of the driving current applied thereto.

On the other hand, the flexible cable 170 is connected to one side of the actuator 130, through which, according to the transmitted operation or stop signal, enters into the disk 110 and is in a loading state (loading) or The disk 110 is moved outward from the disk 110 to become an unloading state. The flexible cable 170 receives a controlled drive signal or power from a circuit board (not shown) disposed below the base member 101. To this end, the flexible cable 170 and the circuit are provided at the corners of the base member 101. The bracket 171 which mediates the connection of a board | substrate is provided.

On the other hand, the spindle motor 120 and the actuator 130 is accommodated in the inner space provided by the base member 101 and the cover member 102 coupled to face up and down. The base member 101 and the cover member 102 protect the components stored therein by preventing the ingress of external foreign matter and block the driving noise from being transmitted to the outside.

When the power of the hard disk drive is turned on and the disk 110 starts to rotate, the voice coil motor rotates the swing arm 132 in a predetermined direction, for example counterclockwise, to rotate the head 134 to the disk 110. On the recording surface. The head 134 rises a predetermined height from the surface of the disk 110 by the lifting force generated by the rotating disk 110. In this state, the head 134 follows a specific track of the disk 110 and records data on the recording surface of the disk 110 or reproduces data stored on the recording surface of the disk 110. Here, the recording surface of the disk 110 refers to a partial area on the disk 110 surface on which information can be effectively stored, and generally does not refer to the entire surface of the disk 110. That is, in the radial direction of the disk 110, the inner edge is allocated for coupling the disk 110 to the spindle motor 120, and the edge outside the disk 110 is the read / write head 134. Can be assigned for parking. Thus, a valid disk 110 surface on which information can be stored can be defined as the area between the inner diameter (ID) on the inner circumferential side and the outer diameter (OD) on the outer circumferential side.

On the other hand, when the power of the hard disk drive is turned off and the rotation of the disk 110 is stopped, the voice coil motor rotates the swing arm 132 in the opposite direction, for example, clockwise direction, so that the head 134 is the disk ( The recording surface of the controller 120). In this way, the head 134 deviating from the recording surface of the disk 110 is parked by the lamp 160 provided on the outside of the disk 110.

3A to 3C are plan views illustrating the actuator of the present invention, in which the unloading operation of the actuator is sequentially shown according to the rotation angle. 3A illustrates a state in which a read / write head 134 is loaded on the disk 110, and FIG. 3B illustrates an unloading operation of the read / write head 134, whereby the read / write head 134 is started. ) Shows the state located near the outer diameter (OD) of the disk 110 at the point when the ramp 160 enters the ramp 160. 3C shows a state in which the head 134 enters the lamp 160 and is seated therein. With respect to the rotational direction of the swing arm 132 shown in the figures, the (+) direction means the direction in which the swing arm 132 is loaded onto the disk 110, that is, the counterclockwise direction in the figure, and (-) The direction means the direction in which the swing arm 132 is unloaded toward the ramp 160, ie clockwise in the figure.

Referring to the drawings, the rear end of the swing arm 132 is provided with a first protrusion 141 protruding toward the magnet 150, the first protrusion 141 is a first magnetic pole of the magnet 150 It protrudes toward 150L. The first protrusion 141 is made of a magnetic material to react with the magnet 150 and is pulled in the negative direction by the first magnetic pole 150L.

For example, as shown in FIG. 3A, when the read / write head 134 is located on the disk 110, the first protrusion 141 is biased in the negative direction from the adjacent left magnetic pole 150L. The rotation force is provided and contributes to the unloading of the head 134. In order for the read / write head 134 to be unloaded toward the lamp 160, friction torque with the lamp 160, bias torque by a flexible printed circuit attached to one side of the actuator 130, and actuator pivot Rotational load such as pivot torque applied to 131 must be overcome. The rotational force τ provided by the voice coil motor to the swing arm 132 is a torque constant determined by the current i applied to the voice coil 137 and the structure of the voice coil motor as follows. Kt).

τ = Kt x i

Here, the torque constant (Kt) is a unique value that does not change for the voice coil motor once designed, such as the magnetic force of the magnet 150, the number of winding of the voice coil 137, and arbitrarily changes the torque constant (Kt) This is undesirable because it affects the price, size, and the like of the entire hard disk drive. As another method of increasing the rotational force of the swing arm 132, when the applied current (i) is increased, the power consumption increases, and there is a need for redesigning a circuit board suitable for a large current. In the present invention, since the protrusion 141 which receives the bias rotational force in the unloading direction (or (-) direction) is provided, the desired rotational force can be obtained without burden of manufacturing cost or power consumption.

Meanwhile, referring to FIG. 4, the magnet 150 may be disposed to face up and down, for example, with a predetermined gap for the VCM coil interposed therebetween, and the VCM coil disposed between the magnets 150. Is rotationally driven while having an electromagnetic interaction with the magnets 150 above and below. In the present invention, the magnet 150 is provided with a protruding portion 158 protruding toward the swing arm 132, in the illustrated example, the protruding portion 158 is formed of the first magnetic pole 150L. It is provided to protrude convexly near the edge. However, in the present invention, the protruding portion 158 may be formed at any one or several places along the longitudinal direction L of the magnet 150 along the circumferential shape, the number of the position or the protruding portion Does not limit the technical scope of the present invention.

As described above, the first protrusion 141 of the swing arm 132 is pulled by the magnet 150 disposed adjacent to receive the bias rotational force in the unloading direction. At this time, the other portion except for the protrusion 158 of the magnet 150 acts almost a magnetic attraction in the lateral direction to the protrusion 141 of the swing arm 132, the protrusion 158 May provide a relatively large bias rotational force with respect to the swing arm 132 by applying magnetic attraction in a direction substantially opposite to the protrusion 141 of the swing arm 132. Accordingly, the bias rotational force acting on the swing arm 132 is changed depending on the distance between the protrusion 158 of the magnet 150 and the protrusion 141 of the swing arm 132. As the swing arm 132 rotates, the first protrusion 141 of the swing arm 132 and the protrusion 158 of the magnet 150 approach or move away from each other, as shown in FIG. 3B. Likewise, when the protrusion 141 of the swing arm 132 and the protrusion 158 of the magnet 150 are close to each other at the shortest distance, for example, the main part of FIG. As can be seen, if the protrusion 141 of the swing arm 132 and the protrusion 158 of the magnet 150 are disposed to overlap each other in the vertical direction, the swing arm 132 may be subjected to a maximum bias rotational force. 3A and 3C, as the distance between the protrusion 141 of the swing arm 132 and the protrusion 150 of the magnet 150 becomes relatively far, as shown in FIGS. As the degree decreases, the bias rotational force of relatively weak strength is applied. Will be.

As shown in FIG. 3B, when the disk 110 is stopped and the unloading operation of the read / write head 134 is started, the end tab 135 at the end of the suspension 133 moves to the outside of the disk 110. To enter the lamp 160 on the support surface of the lamp 160. At this time, the suspension 133 is contacted at a predetermined pressure with respect to the support surface of the lamp 160 by its elastic force, so that a small friction force acts between the end tab 135 and the lamp 160. do. At this time, if the distance between the protrusion 141 of the swing arm 132 and the protrusion 158 of the magnet 150 is designed to be the shortest so that the maximum bias rotation force is generated at the time of entry of the ramp 160, For example, in the illustrated example, if the protrusion 141 of the swing arm 132 and the protrusion 158 of the magnet 150 are designed to overlap vertically with respect to each other, a ramp acting on the end tab 135 It is advantageous to overcome the frictional resistance of 160 and to improve the dynamic properties of the unloading.

On the other hand, in order to ensure the impact resistance characteristics of the hard disk drive, it is preferable that the read / write head 134 does not fall above a predetermined flying height from the surface of the disk 110, and for this purpose, Increasing the Gram Load of the suspension 133 that elastically presses 134 toward the disk 110 surface is desirable to prevent head slap. However, since the gram load of the suspension 133 causes the unloading characteristic to be inhibited through the frictional resistance with the lamp 160, the gram rod of the suspension 133 may be determined in consideration of the rotational resistance during unloading. In the hard disk drive of the present invention, even if the elastic strength of the suspension 133 is increased, the unloading characteristic that satisfies the acceptance criteria can be obtained with the help of the bias rotation force between the swing arm 132 and the magnet 150. It is advantageous to improve the impact resistance by increasing the elastic strength of (133).

On the other hand, in an emergency such as sudden power supply interruption to the hard disk drive or free fall of the hard disk drive due to a handling problem, the read / write head 134 performing a function on the disk 110 is Evacuate to a safe parking location quickly. If a drop shock is applied without any protective measures, a so-called head slap is generated in which the head 134 impacts the surface of the disk 110, and data stored in the disk 110 is damaged and cannot be reproduced. Or the head 134 itself is damaged and can no longer function. Thus, the hard disk drive has an so-called emergency parking function that, for example, rapidly evacuates the read / write head 134 to the parking position by applying the maximum available current to the actuator 130. In the present invention, the evacuation time required for unloading by changing the shape of the relatively simple swing arm 132 and / or the magnet 150 without the inconvenience of redesigning the power supply circuit to increase the maximum available current. Can be shortened as much as possible.

On the other hand, even when the read / write head 134 is loaded on the disc 110, for example, performing a recording / reproducing function of information while following a specific track between the OD and the ID, the lamp 160 If a biased rotational force is applied to the swing arm 132, a so-called tracking error may occur in which the head 148 deviates from the following track. To prevent this, it may be desirable to add a predetermined torque in the reverse direction to the bias rotational force acting in the unloading direction, which will be described in detail below.

In addition to the first protrusion 141, a second protrusion 142 may be further provided at the rear end of the swing arm 132. The second protrusion 142 is provided to be magnetized to respond to the magnet 150 and has a shape protruding toward the magnet 150. However, as described above, the first protrusion 141 protrudes toward the left magnetic pole 150L, whereas the second protrusion 142 protrudes toward the right magnetic pole 150R. The second protrusion 150R is provided with a rotation force pulled in the positive direction from the magnet 10R disposed on the right side. That is, as shown in FIG. 3C, when the head 134 is parked on the ramp 160, the bias rotational force in the positive direction applied to the second protrusion 142 assists the loading operation of the swing arm 132. There is an effect, and as a result, the dynamic characteristics of the swing arm 132 upon loading are improved.

In addition, by providing a second protrusion 142 which induces a bias rotational force in a direction opposite to the first protrusion 141, the bias rotational force in both (+) / (-) directions can be balanced to some extent, The so-called tracking error in which the head 148 deviates from the following track by the bias rotational force can be reduced. On the other hand, although not shown in the drawings, to correspond to the second protrusion, for example, a second protrusion of the magnet facing the second protrusion may be provided with another protrusion, similar to the first pole, This protrusion may apply a strong magnetic bias to the second protrusion, for example, to contribute to the loading operation.

Meanwhile, the first protrusion 141 and the second protrusion 142 are provided to have magnetic properties for magnetic interaction with the magnet 150. The protrusions 141 and 142 may be formed of a magnetic material having magnetic properties as the material itself, for example, SUS 430 or the like, or alternatively, the material itself may have no magnetic properties or very weak magnetic properties, The obtained material may be formed of, for example, SUS 304su, SUS 301, or the like. However, since the magnetic protrusions are exposed to the magnetic disk on which information is recorded in a magnetic manner, the previously recorded data may be modulated, and a part of the data may be deleted or the reproduction may be in a bad state. It may be desirable for the intensity of the magnetic to be constantly limited in relation to the magnetic disk.

6 shows the distribution of the bias rotational force acting on the swing arm according to the rotation angle of the swing arm, where the bias rotational force is a state in which the voice coil motor is not operated, that is, a driving current is applied to the voice coil 137. The rotational force acting on the swing arm 132 in the non-applied state. Profile 'P' represents the bias rotational force in the prior art, and profile 'N1' represents the first case 141 and the second protrusion 142 formed together at the rear end of the swing arm 132 in the first case of the present invention. Indicates the bias rotational force. In addition, the profile 'N2' has a first protrusion 141 and a second protrusion 142 formed together at the rear end of the swing arm 132 and the magnet 150 to interact with the first protrusion 141. ) Shows a bias rotational force in the second case of the present invention provided with a protruding portion 158. In the drawing, the horizontal axis represents the rotation angle θ of the swing arm, and the rotation angle θ of the swing arm 132 is set when the state parked on the ramp 160 (FIG. 3C) is set as a reference (θ = 0). , The swing arm 132 is rotated toward the disk 110, the head 134 of the tip is located at the outer diameter (OD) approximately 20 degrees, and the swing arm 132 is further rotated, The case where the head 134 is located at the inner circumference ID is approximately 38 degrees.

Referring to the drawings, in the prior art (profile 'P'), although there is a change in size depending on the rotational state of the swing arm 132, it can be seen that the bias rotational force in the positive direction always acts. This means that the swing arm 132 is biased in the (+) direction to load the head 134, ie towards the disc 110. This bias rotational force in the positive direction is helpful for the operating characteristics at the time of loading, for example, responsiveness to a signal, driving efficiency, etc., but at the time of unloading, it acts as a rotational load that must be overcome. There is a problem that the operating characteristics of the deterioration significantly.

In contrast, in the first case (profile 'N1') of the present invention, negative bias rotational force acts in almost all regions, which is the direction in which the swing arm 132 unloads the head 134. That is, it is biased toward the lamp 160. In this way, the bias rotation force is reversed in the prior art and the present invention because the protrusion 141 is added to the rear end of the swing arm 132 as a main feature of the present invention. Compared with the conventional bias rotational force of up to about 20 (mN.mm), the magnetic force acting between the protrusion 141 and the magnet 150L has a great influence on the bias rotational force applied to the swing arm 132 and in the opposite direction. As a result, a bias rotational force of up to 20 (mN.mm) is given.

Meanwhile, the read / write head 134 is loaded on the disk 110, that is, the rotation angle of the swing arm 132 is between the range of OD (θ = 20 degrees) and ID (θ = 38 degrees). When at, the bias rotational force acting on the swing arm 132 remains at a significantly low level, which, together with the first projection 141 on the swing arm 132, causes the second projection to induce a bias rotational force in the opposite direction. 142 is provided together to limit the bias rotational force to a certain range. In particular, the bias rotational force acting on the swing arm 132 with the read / write head 134 loaded on the disk 110 is minimal. As a result of maintaining the level, a so-called tracking error in which the head 134 deviates from the track being tracked can be prevented.

Meanwhile, in the second case (profile 'N2') of the present invention in which the protrusion 158 is provided on one side of the magnet 150 so as to correspond to the protrusion 141 of the swing arm 132, negative (- It can be seen that the bias rotational force of) is greatly enhanced. That is, when compared with the first case (profile 'N1') which does not change the shape of the magnet 150, the maximum value of the bias rotational force in the first case is about 20 mN.mm, whereas the magnet 150 In the case of the second case provided with the protruding portion 158, the maximum is about 30 mN.mm. This is, of course, because the protrusion 158 of the magnet 150 acts on the first protrusion 141 of the swing arm 132 to draw a strong magnetic attraction force in the unloading direction. Here, the rotation angle θ of the swing arm 132 at which the bias rotational force is maximum is approximately 16 degrees, at which the protrusion 141 of the swing arm 132 and the protrusion of the magnet 150 are formed. The distance between the 158 will be the shortest, and by appropriately designing the position where the protruding portion 158 is disposed along the longitudinal direction of the magnet 150, for example, the read / write head 134 may cause the ramp to fall. The maximum bias rotation force can be provided at the point of entry into 160.

According to the actuator of the present invention and the hard disk drive including the same, the bias rotational force is provided in the loading / unloading operation of the actuator, thereby improving dynamic characteristics such as quick response and driving efficiency, and also preparing for a crash in case of emergency. Emergency protection measures can be completed quickly, contributing to the impact resistance of the drive device. In particular, in the unloading operation, a sufficient margin of the driving torque is secured to increase the Gram Load of the suspension, thereby preventing a collision between the head and the disk due to the head slap.

Further, according to the present invention, it is possible to easily design a profile of the bias rotational force that satisfies the requirements by adjusting the separation distance between the swinging protrusion of the swing arm and the protrusion of the magnet. Thus, for example, at the time of entry of the ramp where the frictional resistance starts during unloading, the maximum bias rotational force is supplied by narrowing the separation distance between the protrusion and the protrusion, and the read / write head is placed on the disc. In the loaded state, the tracking error due to the bias rotational force can be reduced by increasing the separation distance relatively.

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 (13)

  1. A swing arm having a suspension attached to a read / write head for recording and reproducing, the swing arm being rotatable about a pivot axis;
    A coil support coupled to a rear end of the swing arm to rotate together with the swing arm to assemble a VCM coil; And
    It includes; a magnet disposed on at least one side up and down to face the VCM coil;
    The rear end of the swing arm is provided with at least one protrusion projecting toward the magnet and made of a magnetic material,
    And the magnet is provided with at least one protrusion formed convexly from the body of the magnet toward the protrusion so as to apply a bias rotational force to the protrusion.
  2. The method of claim 1,
    The magnet actuator of the hard disk drive, characterized in that it comprises a first magnetic pole and a second magnetic pole of opposite polarity disposed adjacent to the left and right.
  3. The method of claim 2,
    And the protruding portion is provided at the first magnetic pole facing the protruding portion so that the protruding portion and the protruding portion correspond to each other.
  4. The method of claim 3,
    And the swing arm is provided with an additional protrusion projecting toward the second magnetic pole.
  5. The method of claim 4, wherein
    And the second magnetic pole is provided with an additional protrusion formed convexly toward the additional protrusion.
  6. The method of claim 1,
    And the bias rotational force is changed according to the separation distance between the protrusion of the swing arm and the protrusion of the magnet.
  7. The method of claim 1,
    And the projecting portion and the projecting portion are aligned with each other such that the separation distance between the projecting portion and the projecting portion enters the parking ramp to be the shortest.
  8. A hard disk including at least one information storage disk, a spindle motor into which the disk is inserted by rotationally driving the disk, and an actuator for moving a read / write head for recording and reproduction to a predetermined position on the disk. As a drive,
    The actuator is
    A swing arm having a suspension attached to a read / write head for recording and reproducing, the swing arm being rotatable about a pivot axis;
    A coil support coupled to a rear end of the swing arm to rotate together with the swing arm to assemble a VCM coil; And
    It includes; a magnet disposed on at least one side up and down to face the VCM coil;
    The rear end of the swing arm is provided with at least one protrusion projecting toward the magnet and made of a magnetic material,
    And the magnet is provided with at least one protrusion formed convexly from the body of the magnet toward the protrusion so as to apply a bias rotational force to the protrusion.
  9. The method of claim 8,
    The magnet includes a first magnetic pole and a second magnetic pole of opposite polarity disposed adjacent to the left and right.
  10. The method of claim 9,
    And the protruding portion is provided at a first magnetic pole facing the protruding portion so that the protruding portion and the protruding portion correspond to each other.
  11. The method of claim 10,
    And the swing arm has an additional protrusion projecting toward the second magnetic pole.
  12. The method of claim 11,
    And the second magnetic pole is provided with an additional protrusion formed convexly toward the additional protrusion.
  13. The method of claim 8,
    A lamp for seating the read / write head is further provided on the outer side of the disk, and the protrusion and the protrusion are mutually aligned such that the separation distance between them is shortest at the time when the head enters the lamp. Hard disk drive, characterized in that.
KR1020050115056A 2005-11-29 2005-11-29 Actuator and hard disk drive having the same KR100660895B1 (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
KR1020050115056A KR100660895B1 (en) 2005-11-29 2005-11-29 Actuator and hard disk drive having the same
JP2006278147A JP4907290B2 (en) 2005-10-12 2006-10-11 Hard disk drive actuator and hard disk drive
US11/548,732 US20070081275A1 (en) 2005-10-12 2006-10-12 Actuator and hard disk drive having the same

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102386689A (en) * 2010-08-31 2012-03-21 日本电产株式会社 Spindle motor and storage disk drive having the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102386689A (en) * 2010-08-31 2012-03-21 日本电产株式会社 Spindle motor and storage disk drive having the same
CN102386689B (en) * 2010-08-31 2014-02-26 日本电产株式会社 Spindle motor and storage disk drive having the same

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