JP2000132926A - Head actuator and magnetic disc device with it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a head actuator which enables positioning of a magnetic head at a high accuracy by accurately fixing a spacer, molded by a synthetic resin, integrated with a drive coil and a magnetic disc device therewith. SOLUTION: A head actuator 22 for supporting and positioning a magnetic head of a magnetic disc device has a drive part 70 to generate a turning force. The drive part is provided with a voice coil 44 and a holding frame 74 holding the voice coil and the holding frame is integrally molded by a spacer and a resin. The spacer is supported by a bearing assembly 26 while having a plurality of protrusions 90 positioned on perimeter of the bearing assembly. Arms 32a and 32b are thermocompression bonded through the protrusions 90.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head actuator for moving a magnetic head for recording and reading information to and from a magnetic disk and positioning the magnetic head at a target position, and a magnetic disk drive having the same.

[0002]

2. Description of the Related Art As a magnetic disk drive, for example, a small hard disk drive (hereinafter abbreviated as HDD) is used.
Has been conventionally used as a built-in storage device of a laptop or notebook personal computer.

In general, an HDD is a rotationally oscillating type in which a magnetic disk, a spindle motor for supporting and rotating the magnetic disk, and a magnetic head are movably supported with respect to the magnetic disk in a case made of an aluminum alloy or the like. A head actuator, a voice coil motor (hereinafter abbreviated as VCM) for driving the head actuator, a circuit board, and the like are built in. And the magnetic disk is
High-speed rotation is performed by the spindle motor. The circuit board has mounted thereon various circuit components such as a magnetic head amplifier for amplifying a read signal from the magnetic head.

[0004] The head actuator includes a suspension for supporting the magnetic head, an arm for supporting the suspension, and a rotation support for rotatably supporting the support arm. In addition, the VCM includes a drive coil that can rotate integrally with a spacer provided on the rotation support portion, and a permanent magnet and an opposing yoke provided on the case side. The VCM rotates the actuator by an interaction between a magnetic field generated between the permanent magnet and the opposing yoke and an electromagnetic force generated by energizing the driving coil.

In recent years, among the above-described head actuators, there have been provided head actuators in which the periphery of the drive coil is molded with a synthetic resin to form a spacer integrated with the drive coil. When fixing such a spacer,
A method of fastening to the rotation support portion with a screw, or holding and fixing the arm with a nut or the like from above and below is used.

[0006]

The above-mentioned spacer is formed of a metal such as stainless steel or aluminum. However, it is conceivable to simultaneously form the drive coil with a synthetic resin in order to increase productivity and assembly accuracy. Can be However, in this case, if the spacer made of synthetic resin is fastened or pinched with screws, nuts, or the like, the spacer may be plastically deformed due to creep of the synthetic resin, and the fastening force may be reduced. When the fastening force decreases, the dynamic rigidity of the entire actuator decreases, and the operation control of the actuator becomes unstable. As a result, the positioning accuracy of the magnetic head decreases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to fix a holding member integrally formed with a drive coil integrally formed of a synthetic resin and to position a magnetic head with high accuracy. An object of the present invention is to provide a possible head actuator and a magnetic disk device having the same.

[0008]

In order to achieve the above object, a head actuator according to the present invention comprises a suspension supporting a magnetic head for recording and reading information on and from a magnetic disk, and a metal supporting the suspension. An arm, a rotation supporting portion rotatably supporting the arm, and a driving portion for generating a driving force for rotating the arm, wherein the driving portion includes a driving coil, a resin And a holding member integrally formed on the outer peripheral side of the drive coil to hold the drive coil, and the holding member is supported by the rotation support portion, and is attached to the arm by thermocompression bonding. It is characterized by being fixed.

Further, according to the head actuator of the present invention, the drive section has a drive coil and a holding member which is integrally formed of resin on an outer peripheral side of the drive coil and holds the drive coil. And the holding member is
It is characterized in that it is supported by the rotation support portion and at least a part is press-fitted into the arm and fixed to the arm.

A magnetic disk drive according to the present invention comprises: a magnetic disk; driving means for supporting and rotating the magnetic disk; recording information on the magnetic disk;
A magnetic head that performs reading, a suspension that supports the magnetic head, an arm that supports the suspension, a rotation support unit that rotatably supports the arm, and a driving force for rotating the arm. And a head actuator having a drive unit that generates the drive unit. , And the holding member is supported by the rotation support portion and fixed to the arm by thermocompression bonding.

Further, according to another magnetic disk drive of the present invention, the drive section of the head actuator is formed integrally with the drive coil and the outer periphery of the drive coil by a resin and holds the drive coil. And a holding member, wherein the holding member is supported by the rotation support portion, and is fixed to the arm by thermocompression bonding.

According to the head actuator and the magnetic disk drive configured as described above, the drive coil is
It is integrally held by a holding member made of resin, and is supported by the rotation support portion via the holding member. Therefore, the mechanical strength of the drive unit can be improved, and at the same time, the assemblability can be improved by reducing the number of parts, and the drive unit can be made thinner and lighter.

Further, since the holding member made of resin and the arm made of metal are fixed to each other by thermocompression bonding or press fitting, a decrease in fastening force due to creep or the like of the resin hardly occurs. Can be reliably maintained over a long period of time. As a result, the head actuator can be stably controlled and the magnetic head can be positioned with high accuracy, and reliability can be improved.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an HDD having a head actuator according to an embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG.
The DD has, for example, a rectangular box-shaped case 12 formed of an aluminum alloy or the like and having an open upper surface, and a top cover 14 that is screwed to the case with a plurality of screws 11 and closes an upper end opening of the case. .

In a case 12, a magnetic disk 16 as a magnetic recording medium, a spindle motor 18 for supporting and rotating the magnetic disk, and a plurality of magnetic heads 4 for writing and reading information to and from the magnetic disk.
0, a rotary head actuator 22 that movably supports these magnetic heads with respect to the magnetic disk 16;
A voice coil motor (hereinafter abbreviated as VCM) 24 functioning as a drive source for the head actuator, and a board unit 21 on which a head IC and the like are mounted are housed.

On the outer surface of the bottom wall of the case 12, a spindle motor 18, a VCM 2
4, and a printed circuit board (not shown) for controlling the operation of the magnetic head are screwed.

The magnetic disk 16 has a diameter of 65 mm (2.
5 inches) and has a magnetic recording layer on the upper and lower surfaces. The magnetic disk 16 holds the spindle motor 1
8 are coaxially fitted to a hub (not shown) and held by a clamp spring 17. Then, the magnetic disk 16 is driven to rotate at a predetermined speed by a spindle motor 18.

As shown in FIGS. 1 to 3 and FIG. 5A, the head actuator 22 has a bearing assembly 26 fixed on the bottom wall of the case 12. The bearing assembly 26 functioning as a rotation supporting portion includes a pivot 27 vertically erected on the bottom wall of the case 12 and a cylindrical hub 28 rotatably supported on the pivot via a pair of bearings.
And A flange 30 having a larger diameter than the hub is formed at the lower end of the hub 28, and a plurality of recesses 30b and a screw hole 30a for allowing a thermocompression bonding portion described later to escape are formed in this flange.

The head actuator 22 includes two arms 32a, 32b and a spacer 34 attached to the hub 28, and two magnetic head assemblies 36 supported by each arm.

The arms 32a and 32b are, for example, S
With a stainless steel material such as US304, a plate thickness of 250
It is formed in a flat plate shape of about μm and has a predetermined rigidity, and has a circular insertion hole 33 at one end, that is, at the base end.
Are formed. The spacer 34 is made of synthetic resin and has a circular insertion hole 33.

Each magnetic head assembly 36 has an elongated plate-like suspension 38 that can be elastically deformed, and a magnetic head 40 fixed to the tip of the suspension.
The suspension 38 is formed of a leaf spring, and its base end is formed by spot welding, bonding, or the like.
It is fixed to the tip of 32b and extends from the arm.

Each magnetic head 40 has a substantially rectangular slider and a recording / reproducing MR (magnetoresistive) head formed on the slider, and has a gimbal portion (not shown) provided at the tip of a suspension 38. Fixed.

The arms 32a and 32b, to which the magnetic head assembly 36 is attached, are fitted on the outer periphery of the hub in a state of being stacked on the flange 30 by inserting the hub 28 into the insertion hole 33. Also, the spacer 34
The hub 28 is inserted through the insertion hole 33 and the arm 32
a and 32b, and fitted to the outer periphery of the hub 28. As will be described later, these two arms 32
The a and 32b and the spacer 34 are fixed to each other by thermocompression bonding, and are fixed to the flange 30 of the hub 28 by screws. Thereby, two arms 32
a and 32b are located parallel to each other at a predetermined interval, and extend from the hub 28 in the same direction.

The magnetic heads 40 of the magnetic head assembly 36 attached to the arms 32a and 32b are located facing each other, and are rotatable integrally with the arm and the hub 28. Further, the spacer 34 is provided with a holding frame 7 holding a voice coil 44 of an actuator driving unit described later.
4, and the holding frame is provided with arms 32a, 32
b.

As shown in FIGS. 2 to 5, the actuator driving section 70 includes the voice coil 44 constituting a part of the VCM 24, and its outer periphery is covered by a holding frame 74. The holding frame 74 and the spacer 34 are integrally formed of a synthetic resin, for example, a thermoplastic resin such as a liquid crystal polymer, and are also integrated around the voice coil 44 at the same time. These holding frame 74 and spacer 34
Constitutes the holding member of the present invention.

In the holding frame 74, the spacer 34
A stopper 8 protruding laterally is provided on one end side surface separated from the
3 are integrally formed. The stopper 83 has a through hole for reducing the impact force, has a spring property, and has a lock pin 84 for magnet lock made of a ferromagnetic material standing upright.

As shown in FIG. 2 to FIG.
The spacer 34 integrated with the voice coil 44 has flat joining surfaces 88a, 88b for joining the arms 32a, 32b to the upper and lower surfaces thereof. Joint surface 8
A plurality of, for example, four protrusions 90 for thermocompression-bonding the arm 32a to the spacer 34 are provided on 8a. Three of the projections 90 are provided at predetermined intervals around the insertion hole 33, and the other one is provided at the tip of the spacer 34. Each projection 90 is formed, for example, in a columnar shape. In addition, a through hole 91 through which the fixing screw 92 is inserted is formed through the joint surface 88a, and extends in parallel with the insertion hole 33.

The other joint surface 88b also has four projections 90 provided symmetrically to the joint surface 88a side, and a through hole 91 is opened. On the other hand, each arm 32a,
32b, four through holes 94 are formed at positions corresponding to the protrusions 90 of the spacer 34, and the fixing screws 9
2, a through hole 93 is formed. The arms 32a and 32b are fixed to the joint surfaces 88a and 88b of the spacer 34 by thermocompression.

More specifically, when the spacer 34 and the arms 32a and 32b are thermocompression-bonded, as shown in FIG. 5B, first, the protrusions 90 of the spacer 34 are inserted into the corresponding through holes 94. The arm 32a is mounted on the joint surface 88a of the spacer 34. At this time, since the plurality of projections 90 respectively engage with the plurality of through holes 94, the arm 32a can be attached to the spacer 3 without using a special positioning jig or the like.
4 can be attached to a predetermined position.

Subsequently, as shown in FIG.
The tip of each protrusion 90 protruding from the arm 4 is attached to the arm 32a.
By pressing and heating to the side, the tip of the projection 90 made of the liquid crystal polymer is melted to close the through hole 94 and is crushed to a diameter larger than that of the through hole 94. Thereby, the base end of the arm 32a is fixed to the joint surface 88a of the spacer 34. At the time of such thermocompression bonding, the stress on the spacer 34 made of the liquid crystal polymer is limited to the vicinity of the protrusion 90, and therefore the entire spacer is not deformed.

The arm 32b is also fixed to the joint surface 88b of the spacer 34 by the same thermocompression bonding process as described above. Arms 32a fixed to each other by thermocompression bonding,
The spacer 32b and the spacer 34 are mounted on the flange 30 with the hub 28 of the bearing assembly 26 being inserted into the insertion hole 33, as shown in FIGS. Through the through hole 92, the through hole 91 of the spacer 34, and the through hole 93 of the arm 32b.
Is screwed into the screw hole 30a of the bearing assembly, and is fixed to the hub 28 of the bearing assembly.

Since the thermocompression bonding point on the arm 32b side, that is, the tip of each projection 90, is located in the recess 30b formed in the flange 30 of the bearing assembly 26, a pair of arm and spacer The laminate consisting of 34 is fixed to the bearing assembly without rattling.

As can be clearly understood from FIG. 1, the magnetic disk 16 is located between the arms 32a and 32b in a state where the head actuator 22 having the above-described configuration is incorporated in the case 12. The magnetic head 4 attached to a suspension 38 extending from the arms 32a, 32b
Numeral 0 contacts the upper and lower surfaces of the magnetic disk 16, respectively, and holds the magnetic disk 16 from both sides. A predetermined head load is applied to each magnetic head 40 by the spring force of the suspension 38, and is biased toward the surface of the magnetic disk.

The voice coil 44 of the actuator driving section 70 is located between a pair of yokes 48 fixed on the case 12 and constitutes the VCM 24 together with these yokes and a magnet (not shown) fixed to one of the yokes. ing. When the voice coil 44 is energized, the head actuator 22 rotates, and the magnetic head 4
0 is moved and positioned on a desired track of the magnetic disk 16.

As shown in FIG. 1, the board unit 21
Rectangular substrate body 51 fixed on the bottom wall of case 12
On the substrate body, various circuit components such as a magnetic head amplifier for amplifying a read signal from the magnetic head 40, a connector, and the like are mounted. The board unit 21 is a belt-shaped main flexible printed circuit board (hereinafter, referred to as a main FPC) extending from the board body 51.
54 are integrally provided.

The main FPC 54 includes a signal line for connecting the magnetic head 40 and the magnetic head amplifier, and a wiring pattern such as a cable for driving the voice coil 44 of the head actuator 22. Also,
The extension end 54a of the main FPC 54 is fixed to the spacer 34 of the head actuator 22 with screws, and a number of connection pads (not shown) are provided at the extension end.

On the other hand, each magnetic head 40 is electrically connected to a corresponding connection pad of the main FPC 54 via a relay flexible printed circuit board (hereinafter, referred to as a relay FPC) 60. As shown in FIG. 3, the relay FPC 60 is attached and fixed to the surfaces of the arms 32a and 32b and the suspension 38, and extends from the distal end of the suspension to the proximal end of the arm. Thus, each magnetic head 40 is electrically connected to the board unit 21 via the relay FPC 60 and the main FPC 54.

According to the HDD having the above configuration, during operation, the magnetic disk 16 is rotated at a high speed by the spindle motor 18 and a drive current is supplied to the voice coil 44 of the VCM 24 from a servo system (not shown). Then, an interaction between the magnetic field generated from the voice coil 44 and the magnetic field from the permanent magnet provided on the yoke 48 generates an electromagnetic force in the voice coil, and the head actuator 22 rotates around the bearing assembly 26. Each magnetic head 40 moves in the radial direction of the magnetic disk while flying above the magnetic disk 16 and is positioned at the target position.

As described above, according to the HDD of the present embodiment, the voice coil 44 is integrally connected and held by the holding frame 74 made of a synthetic resin. And a synthetic resin. Therefore, the number of components can be reduced and the assemblability can be improved, and the mechanical strength of the drive unit can be improved. At the same time, the actuator drive unit 70 can be made thinner and lighter.

A spacer 34 made of synthetic resin is used.
And the arms 32a and 32b made of metal are fixed to each other by thermocompression bonding, so that a decrease in fastening force due to creep or the like of the spacer 34 is unlikely to occur, and the fixed state between the spacer and the arm can be reliably maintained for a long period of time. Can be maintained. As a result, the head actuator 22 can be controlled stably, and the magnetic head can be positioned with high accuracy, and reliability can be improved.

Next, a head actuator according to another embodiment of the present invention will be described. 6 and 7
According to the present embodiment, the spacer 34 and the arm are press-fitted into the opening formed on the arm side, as shown in FIG.
Fixed to each other.

That is, the spacer 34 formed integrally with the holding frame 44 by synthetic resin has a flat joining surface 8 for joining the arms 32a and 32b to the upper and lower surfaces thereof.
8a and 88b. Three hemispherical projections 95 located adjacent to and around the periphery of the insertion hole 33, three projections 96 located outside the projection 95 around the insertion hole 33, and the spacer 34 And one projection 90 located at the tip of the projection. The protrusions 95 and 96 are provided at predetermined intervals along the circumferential direction of the insertion hole 33. The projection height of the projections 95 and 96 is formed smaller than the plate thickness of the arm 32a. The same projections 95, 96, 90 as those described above are provided on the other joining surface 88b symmetrically with the joining surface 88a.

On the other hand, in each of the arms 32a and 32b, three notches 97 formed on the periphery of the insertion hole 33 and corresponding to the protrusions 95 of the spacer 34, and three notches 97 corresponding to the protrusions of the spacer 34 are formed. Rectangular opening 98 and projection 90
Is formed. Each notch 9
7 and opening 98 are formed in corresponding projections 9 of spacer 34.
5, 96 are formed to have a width larger than the diameter of the distal end and smaller than the diameter of the base end.

As shown in FIGS. 6 and 8 (a), in the present embodiment, the bearing assembly 26 includes a pivot 27 vertically erected on the bottom wall of the case 12, and a pivot 27 on the pivot. And a cylindrical hub 28 rotatably supported via a pair of bearings. An annular flange 41 is formed on the upper end of the hub 28, and a screw portion 31 is formed on the outer periphery of the lower end.

The two arms 32a, 32b and the spacer 34 are screwed into the screw portion 31 in a state where the hub 28 is inserted into the insertion hole 33 and the spacer 34 is located between the two arms. Nut 42 and flange 4
1 and is fixedly held on the outer peripheral surface of the hub. As a result, the two arms 32a and 32b are located parallel to each other at a predetermined interval and extend from the hub 28 in the same direction. In addition, hub 2
8, the flange 41 and the nut 42 function as fastening means in the present invention.

Here, the spacer 34 made of synthetic resin and the arms 32a and 32b made of metal are fixed to each other by compression bonding and thermocompression bonding. That is, at the time of assembling the head actuator 22, as described above, after inserting the hub 28 of the bearing assembly 26 into the insertion holes 33 of the arms 32a and 32b and the spacer 34, the nut 42 is tightened, and the nut and the flange 41 Between the arm and the spacer.

At this time, as shown in FIGS. 8 (a) and 8 (b), the projections 95 and 96 on the spacer 34 side are respectively inserted into the corresponding cutouts 97 and openings 98 of the arms 32a and 32b.
And the projection 90 is formed with the through hole 10 on the arm side.
Insert at 0. By tightening the nut 42 in this state, the arms 32a and 32b are pressed toward the joint surfaces 88a and 88b of the spacer 34, respectively, and
The distal end portions 5 and 96 enter the corresponding notches 97 and openings 98. Further, the edge of the notch 97 and the edge of the opening 98 abut against the base ends of the projections 95 and 96, respectively, and crush the interference portion. Thereby, the protrusion 95 of the spacer 34,
Reference numeral 96 denotes a notch 97 and an opening 98 of the arms 32a and 32b.
And the spacer and the arm are pressed and fixed to each other.

The projections 90 of the spacers 34 are inserted into the through holes 100 of the arms 32a and 32b, and are heated and pressed in the same steps as in the above-described embodiment. ing. Note that, in the present embodiment, screw bonding may be used instead of the thermocompression bonding portion using the protrusion 90. The other configuration is the same as that of the above-described embodiment, and the same portions are denoted by the same reference characters and detailed description thereof will not be repeated.

According to another embodiment configured as described above, the voice coil 44 is integrally connected and held by the holding frame 74 made of synthetic resin, and the holding frame 74 is connected to the spacer 34. It is integrally formed of synthetic resin. Therefore, the number of parts can be reduced and the assemblability can be improved, and the mechanical strength of the drive unit can be improved.
0 can be made thinner and lighter.

Further, the spacer 34 made of synthetic resin is used.
And the arms 32a and 32b made of metal are fixed to each other by crimping, so that a decrease in fastening force due to creep or the like of the spacer 34 does not easily occur, and the fixed state between the spacer and the arm is reliably maintained for a long period of time. can do. As a result, the head actuator 22 can be controlled stably, and the magnetic head can be positioned with high accuracy, and reliability can be improved.

The present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the present invention. For example, in the above other embodiment, the spacer 3
Even when the projections 95 and 96 are not provided on the arm 4, by forming the notch or the opening on the arm side, a part of the spacer bites into the notch and the opening when tightening with the nut 41,
The effect of pressure bonding between the spacer and the arm can be obtained. Further, the material of the arm and the spacer, the shape of the spacer, the shape and number of the protrusions, the shape of the through-holes and the openings, and the like can be changed as necessary.

[0052]

As described above in detail, according to the present invention, the use of the holding frame holding the drive coil and the spacer formed integrally with the synthetic resin improves the assemblability, and reduces the thickness and weight. A head actuator that can obtain a head actuator with high accuracy and can maintain the bonding strength between the spacer and the arm for a long period of time by fixing the spacer to the arm by thermocompression or crimping, and can position the magnetic head with high accuracy , And a magnetic disk device provided with the same.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an HDD according to an embodiment of the present invention.

FIG. 2 is a perspective view of a head actuator provided in the HDD.

FIG. 3 is an exploded perspective view of the head actuator.

FIG. 4 is a plan view and a side view showing an actuator driving unit and a spacer of the head actuator.

FIG. 5 is a side view of the head actuator and a cross-sectional view showing a thermocompression bonding portion in an enlarged manner.

FIG. 6 is an exploded perspective view of a head actuator according to another embodiment of the present invention.

FIG. 7 is a plan view and a side view showing an actuator drive unit and a spacer of the head actuator.

FIG. 8 is a side view of the head actuator and a cross-sectional view showing a thermocompression bonding portion in an enlarged manner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 ... Case 16 ... Magnetic disk 21 ... Board unit 22 ... Head actuator 24 ... Voice coil motor 26 ... Bearing assembly 28 ... Hub 34 ... Spacer 38 ... Suspension 40 ... Magnetic head 44 ... Voice coil 70 ... Actuator drive part 74 ... Holding Frame 90 ... Protrusion 94 ... Through holes 95, 96 ... Protrusion 97 ... Notch 98 ... Opening

Claims (10)

[Claims] 1. A suspension supporting a magnetic head for recording and reading information on and from a magnetic disk, an arm made of metal supporting the suspension, and a rotation support portion rotatably supporting the arm. A driving unit for generating a driving force for rotating the arm, wherein the driving unit is formed integrally with a driving coil and an outer peripheral side of the driving coil by a resin and holds the driving coil. And a holding member, wherein the holding member is supported by the rotation support portion and fixed to the arm by thermocompression bonding. The holding member integrally has a holding frame holding the driving coil and a spacer portion supported by the rotation support portion, wherein the spacer portion is provided on the rotation support portion. 2. The head actuator according to claim 1, further comprising a plurality of protrusions that are arranged around and that are thermocompression-bonded to the arm while being inserted through through holes formed in the arm. 3. The rotation support portion includes a rotatable cylindrical hub, and the arm includes a plurality of insertion holes through which the hub is inserted, and a plurality of arms formed at predetermined intervals around the insertion holes. The spacer portion has an insertion hole through which the hub is inserted, a flat joint surface in contact with the arm, and a through hole of the arm protruding from the joint surface. A plurality of the projections inserted, each projection having a tip protruding from the arm, the tip is heated and pressurized to close the through hole and the through hole 3. The head actuator according to claim 2, wherein the head actuator is crushed to a diameter larger than the diameter of the head actuator. 4. The rotating support section has a flange formed on the hub, and the thermocompression-bonded spacer section and the arm are screwed to the flange. The head actuator according to any one of the preceding claims. 5. A suspension for supporting a magnetic head for recording and reading information on and from a magnetic disk, an arm made of metal for supporting the suspension, and a rotation support for rotatably supporting the arm. A driving unit for generating a driving force for rotating the arm, wherein the driving unit is formed integrally with a driving coil and an outer peripheral side of the driving coil by a resin and holds the driving coil. And a holding member, wherein the holding member is supported by the rotation support portion, and at least a part of the holding member is pressed into the arm and fixed to the arm. 6. The holding member integrally includes a holding frame holding the drive coil and a spacer portion supported by the rotation support portion, wherein the arm is provided around the rotation support portion. A plurality of openings or notches provided in the arm, the spacer portion has a joint surface in contact with the arm and facing the notch or opening of the arm, and the rotation support portion includes the arm and the notch. 6. The head actuator according to claim 5, further comprising fastening means for pressing the spacers in directions approaching each other and press-fitting a part of the spacers into an opening or notch of the arm. 7. The head actuator according to claim 6, wherein the spacer portion includes a plurality of protrusions protruding from the joint surface and press-fitted into openings or notches of the arm. 8. The rotation support section includes a rotatable cylindrical hub inserted through insertion holes formed in the arm and the spacer section, and the fastening means is formed at one end of the hub. 8. The head actuator according to claim 6, further comprising: a flange; and a nut screwed into the other end of the hub and holding the arm and the spacer between the flange and the flange. 9. A magnetic disk, driving means for supporting and rotating the magnetic disk, a magnetic head for recording and reading information on and from the magnetic disk, a suspension supporting the magnetic head, and the suspension A head actuator comprising: an arm supporting the arm; a rotation support unit rotatably supporting the arm; and a driving unit that generates a driving force for rotating the arm. The drive unit of the drive coil,
A holding member that is formed integrally with the outer periphery of the drive coil by resin and holds the drive coil, and the holding member is supported by the rotation support portion,
A magnetic disk drive fixed to the arm by thermocompression bonding. 10. A magnetic disk, driving means for supporting and rotating the magnetic disk, a magnetic head for recording and reading information on and from the magnetic disk, a suspension supporting the magnetic head, and the suspension A head actuator comprising: an arm supporting the arm; a rotation support unit rotatably supporting the arm; and a driving unit that generates a driving force for rotating the arm. The drive unit of the drive coil,
A holding member that is formed integrally with the outer periphery of the drive coil by resin and holds the drive coil, and the holding member is supported by the rotation support portion,
A magnetic disk drive wherein at least a part is press-fitted into the arm and fixed to the arm.