JP2665300B2 - Actuator structure of magnetic disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator structure of a magnetic disk drive, and more particularly to an actuator structure of a magnetic disk drive having a structure in which a servo magnetic head is provided together with a recording / reproducing magnetic head.

With the recent increase in speed, capacity, and downsizing of computer systems, magnetic disk devices as external storage devices have become lighter and thinner and smaller, and the mounting of each mechanical component has also been required to have a higher density. ing.

[0003] Further, when the size of each mechanical component, especially the actuator, is reduced by reducing the size and weight of the magnetic disk drive, the recording / reproducing signal line connected to the recording / reproducing magnetic head and the servo magnetic head are connected. The servo signal lines thus set are also arranged close to each other.

Since a relatively high level of alternating current flows through the recording / reproducing signal line, if the recording / reproducing signal line and the servo signal line are disposed close to each other, an alternating current flowing through the recording / reproducing signal line is generated. The electromagnetic wave may adversely affect the servo signal line as electromagnetic wave noise.

Therefore, there is a demand for an actuator structure in which a recording / reproducing signal line does not adversely affect a servo signal line even if the magnetic disk device is reduced in size and size.

[0006]

2. Description of the Related Art Conventionally, a so-called servo surface servo for taking in servo information written on a dedicated servo surface and positioning a magnetic head (read / write head) for performing recording / reproducing processing on a target track. In a disk drive, a magnetic head for servo is arranged on an arm together with a read / write head. The actuator includes a servo semiconductor device (servo IC) connected to the servo magnetic head and a recording / reproducing semiconductor device (read / write I / O) connected to the read / write head.
C) are attached.

By the way, a considerable current flows through the recording / reproducing IC at the time of reading / writing data (particularly at the time of writing). Therefore, if the servo IC and the read / write IC are arranged close to each other, there is a problem that noise is added to the servo IC when the read / write IC is written.

A read / write signal line (read / write) connecting the read / write IC and the read / write head is provided.
The same is true even if the signal line for writing) and the signal line for servo connecting the servo IC and the magnetic head for servo are arranged close to each other, and the induction noise due to electromagnetic induction is generated from the signal line for reading / writing. This induced noise (hereinafter referred to as the servo noise) affects the servo signal line, and the servo noise is superimposed on the servo signal.

As described above, when the read / write IC or the read / write signal line adversely affects the servo IC or the servo signal line, the servo signal is disturbed and the positioning accuracy of the actuator is deteriorated. There was a point.

Conventionally, the following actuator structure has been proposed as a means for solving the above problems.

[0011] The read / write signal line and the servo signal line are wired in a position that is non-parallel and as far away as possible.

The opposing read / write head and servo magnetic head are fixed to the actuator by being shifted in the arm rotation direction or the circumferential direction of the magnetic disk.

The servo magnetic head and the read / write head are not mounted on the same arm.

[0014] Servo IC and Read / Write IC
Are disposed on different surfaces of the actuator (specifically, the outer peripheral portion of the rotation shaft).

[0015]

However, the above-described actuator structure has a problem that the size of the arm is increased, and accordingly, the actuator is also increased in size, which is contrary to the reduction in size and size of the magnetic disk drive.

In the above actuator structure,
The servo arm must be provided separately from the recording / reproducing arm. Therefore, there is a problem that the weight of the entire arm is increased, and the power consumption of the voice coil motor serving as the drive source of the actuator is increased. Further, the size of the actuator is increased by the provision of the servo arm.

Further, in the above actuator structure,
Each IC is disposed in a state of protruding from the outer peripheral portion of the rotation shaft.
The outer peripheral position of the rotary shaft of the actuator is a portion where other mechanical components are densely arranged, and each IC is configured to rotate with the rotation of the arm. Therefore, even if the arm is rotated around the rotation shaft outer peripheral portion of the actuator, each IC
However, it is necessary to provide a space so as not to come into contact with other mechanical devices. For this reason, there has been a problem that the magnetic disk device becomes large even in the actuator structure.

On the other hand, in an actuator structure which focuses on miniaturization of the magnetic disk drive, components on the read / write side and components on the servo side come close to each other.
As described above, the servo noise is superimposed on the servo signal and the positioning accuracy of the actuator is deteriorated.

The present invention has been made in view of the above points, and has as its object to provide an actuator structure of a magnetic disk drive capable of improving the positioning accuracy of an actuator while reducing the size and weight of the magnetic disk drive. I do.

[0020]

The above objects can be attained by the following means.

According to a first aspect of the present invention, there are provided a plurality of arms mounted with a recording / reproducing magnetic head for performing a magnetic recording / reproducing process on a magnetic disk, and the plurality of arms are rotated in a radial direction of the magnetic disk. Operating the magnetic head for recording / reproducing at a predetermined position on the magnetic disk, and controlling the positioning of the magnetic head for recording / reproducing with the magnetic head for recording / reproducing on at least one of the plurality of arms. A flexible circuit board on which a magnetic head for servo is mounted and which has a first substrate connected to the magnetic head for recording and reproduction, and a second substrate connected to the magnetic head for servo A virtual line connecting the center of rotation of the arm and the center of each of the magnetic heads. And the flexible circuit board is configured such that the first board section and the second board section can be pulled out independently of each other, and the first section of the flexible circuit board is 1 board portion, and the second portion of the flexible circuit board is provided on the other portion of the arm separated by the virtual line.
Is drawn out and arranged.

According to a second aspect of the present invention, there are provided a plurality of arms mounted with a recording / reproducing magnetic head for performing magnetic recording / reproducing processing on a magnetic disk, and the plurality of arms are rotated in the radial direction of the magnetic disk. Operating to position the recording / reproducing magnetic head at a predetermined position on the magnetic disk,
Of the plurality of arms, a servo magnetic head for performing positioning control of the recording / reproducing magnetic head together with the recording / reproducing magnetic head is mounted on at least one arm, and the recording / reproducing magnetic head and In the actuator structure of a magnetic disk drive having a flexible circuit board on which a recording / reproducing semiconductor device to be connected and a servo semiconductor device to be connected to the servo magnetic head are arranged, Assuming a virtual line connecting the head centers of the magnetic heads, a recording / reproducing signal line for connecting the recording / reproducing magnetic head and the flexible circuit board, and a recording / reproducing signal, are provided at one portion of the arm separated by the virtual line. A semiconductor device for servo is provided, and the other side of the arm separated by the virtual line is provided with a servo magnetic device. Servo signal line connecting the head and the flexible circuit board, and is characterized in that it has provided the servo semiconductor device.

According to a third aspect of the present invention, in the actuator structure of the magnetic disk device according to the first aspect, the flexible circuit board is provided with the recording / reproducing semiconductor device and the recording / reproducing signal line is connected to the flexible circuit board. A first substrate portion on which a recording / reproducing terminal portion to be connected is formed; and a second substrate portion on which the servo semiconductor device is provided and a servo terminal to which the servo signal line is connected is formed. And the substrate portion are integrally formed, and
The first substrate portion may be provided at one portion of an arm separated by the virtual line, and the second substrate portion may be extended to the other portion of the arm separated by the virtual line. It is a feature.

According to a fourth aspect of the present invention, in the actuator structure of the magnetic disk device according to the first aspect, a magnetic field is provided between a portion where the recording / reproducing magnetic head is provided and a portion where the servo magnetic head is provided. It is characterized in that a body metal member is interposed.

[0025]

According to the first aspect of the present invention, the first substrate portion of the flexible circuit board is provided at one portion of the arm separated by a virtual line connecting the center of rotation of the arm and the center of each of the magnetic heads. Since the second substrate is provided at the other portion, the positions of the recording / reproducing signal lines and the servo signal lines are largely separated from each other with the virtual line substantially at the center.

Therefore, the recording / reproducing semiconductor device and the recording / reproducing signal line do not adversely affect the servo semiconductor device and the servo signal line, and the positioning accuracy of the actuator can be improved.

According to the second aspect of the present invention, the recording / reproducing signal line and the recording / reproducing semiconductor are provided at one portion of the arm which is separated by a virtual line connecting the center of rotation of the arm and the center of each of the magnetic heads. Since the device is arranged and the servo signal line and the semiconductor device for servo are arranged on the other part,
The arrangement positions of the recording / reproducing signal lines and the servo signal lines and the arrangement positions of the recording / reproducing semiconductor device and the servo semiconductor device are largely separated from each other with the virtual line substantially at the center.

Therefore, the recording / reproducing semiconductor device and the recording / reproducing signal line do not adversely affect the servo semiconductor device and the servo signal line, and the positioning accuracy of the actuator can be improved. Further, the semiconductor device for recording / reproducing and the semiconductor device for servo are arranged on the arm with the virtual line substantially at the center, so that each semiconductor device does not interfere with other mechanical devices and the size of the magnetic disk device is reduced. Can be achieved.

According to the third aspect of the present invention, the first substrate portion is disposed on one side of the arm separated by the virtual line, and the second substrate portion is separated by the virtual line. Since it can be pulled out to the other part of the arm, the magnetic head for recording / reproducing, the signal line for recording / reproducing, the semiconductor device for recording / reproducing, the magnetic head for servo, the signal line for servo, the semiconductor device for servo can be formed on one flexible circuit board. Wiring can be performed. Further, since the second substrate portion is drawn out to the other portion of the arm separated by the virtual line, the servo semiconductor device can be disposed close to the servo magnetic head.

On the recording / reproducing side, the influence of the servo noise appears most remarkably in a portion from each magnetic head to each semiconductor device. Accordingly, by extending the second substrate portion and disposing the servo semiconductor device close to the servo magnetic head, it is possible to reduce a portion where the influence of servo noise occurs, thereby improving the positioning accuracy of the actuator. Can be.

According to the fourth aspect of the present invention, since a magnetic metal member functioning as a shield material is interposed between the portion where the recording / reproducing magnetic head is provided and the portion where the servo magnetic head is provided, The effect of servo noise at the position where the magnetic head is provided can be reduced.

[0032]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 8 is an internal plan view of a magnetic disk drive to which an actuator structure according to an embodiment of the present invention is applied.

In FIG. 1, a magnetic disk (hereinafter simply referred to as a "disk") 1 serving as a recording medium is fixed on a spindle motor 2 which rotates at a high speed, and a plurality of disks 1 are stacked on a base 7. It is arranged in the state where it was done. An actuator 3 which is a main part of the present invention is disposed on the side of the position where the disk 1 is disposed. The actuator 3 includes a head arm 4, a voice coil motor (V
CM) 5, a rotating shaft 6, a spring arm 10, a flexible circuit board (hereinafter, referred to as FPC) 13, and the like.

A magnetic head for recording / reproducing data to / from the disk 1 (hereinafter referred to as a read / write head)
Numeral 8 is fixed to the tip of the head arm 4. Further, the magnetic disk device according to the present embodiment takes in servo information written on a dedicated servo surface of the disk 1 and performs a so-called servo surface servo for positioning the read / write head 8 on a target track. Since it is a disk device, a magnetic head (hereinafter referred to as a servo head) 9 for reading servo information written on a servo surface is fixed to the tip of the head arm 4. A plurality of read / write heads 8 are provided in correspondence with the plurality of disks 1 provided, but only one servo head 9 is provided. Is selected at the approximate center position.

A VCM coil is fixed to the base end side of the head arm 4, and a central portion thereof is rotatably held by a rotating shaft 6 implanted on a base 7.
The VCM 5 includes a VCM magnet, an upper yoke, a lower yoke, and the like. The head arm 4 rotates in a direction indicated by an arrow in FIG. Therefore, when the VCM 5 is driven, each of the magnetic heads 8 and 9 disposed at the distal end of the head arm 4 is configured to be able to face a predetermined track on the disk 1.

Next, the structure of the actuator 3 as a main part of the present invention will be described with reference to FIGS. 1 to 7 in addition to FIG. FIG. 1 is a plan view of the actuator 3 (showing a state in which the read / write head 8 and the servo head 9 are both provided), and FIG. 2 is a plan view of the actuator 3 in which only the servo head 9 is provided. FIGS. 3 and 6 are enlarged views of a spring arm 10 constituting the actuator 3, and FIG.
5 is a right side view of the actuator 3 (a spring arm provided with the read / write head 8 is not shown), and FIG. 7 is an enlarged view showing the vicinity of the head. It is.

As described above, the actuator 3 includes the head arm 4, the VCM 5, the rotating shaft 6, the spring arm 10, the FPC 13, and the like. The head arm 4 integrally has a bearing portion 11 that is supported by the rotating shaft 6 and a plurality of arm portions 12 that extend from the bearing portion 11 laterally (in a direction toward the disk 1). It has a configuration. A read / write head 8 and a servo head 9 are disposed via a spring arm 10 on an arm portion 12a located substantially at the center of the plurality of arm portions 12 (see FIGS. 4 to 6). detailed).

A read / write signal line 14 is connected to the read / write head 8, and a servo signal line 15 is connected to the servo head 9. The other end of the read / write signal line 14 is connected by soldering to a read / write connection pad (hereinafter referred to as R / W pad) 16 formed on the FPC 13, and the other end of the servo signal line 15. Are connected to the servo pads 17 formed on the FPC 13 by soldering.

FIGS. 9 and 10 are views showing the FPC 13 in an enlarged manner. As shown in FIG. 9, the FPC 13 is a single flexible circuit board having a rectangular shape, and is a semiconductor device for recording / reproducing (hereinafter, referred to as a read / write IC).
18, 19 and a servo semiconductor device (hereinafter referred to as servo I
20 (referred to as C). This F
A substantially central portion of the PC 13 is formed with a U-shaped cut portion 21, and the FPC 13 is defined by the cut portion 21 on a first substrate portion 22 and a second substrate portion 23. The first substrate portion 22 includes the read / write IC 18 described above,
19 and R / W pads 16 are provided, and the second substrate portion 23 has a servo IC 20 and a servo pad 17.
Are arranged. In particular, in the second substrate portion 23, the disposition position of the servo IC 20 and the servo pad 17 is selected near the end of the second substrate portion 23.

In the FPC 13 having the above configuration, the cutting section 2
Since 1 is formed, as shown in FIG. 10, the second substrate portion 23 can be displaced with respect to the first substrate portion 22. Therefore, the second substrate is
Can be disposed in a state where the substrate portion 23 is pulled out.

Here, the arrangement of each component constituting the above-mentioned actuator 3 will be described below, focusing on its arrangement. In the present invention, an imaginary line 25 (FIG. 1 and FIG. 8) connecting the center position of the rotation axis serving as the rotation center of the head arm 4 and the center of each of the magnetic heads 8 and 9 when viewed in plan.
, A read / write component and a servo component are defined and spaced from the virtual line 25 as a center.

More specifically, the configuration shown in FIG. 1 will be described as an example. The read / write signal line 14, the R / W pad 16, and the first substrate portion 22, which are read / write components, are described. , Read / write ICs 18 and 19 are collectively arranged on the right side of the virtual line 25 of the head arm 12 (including the spring arm 10). Also, servo signal lines 15, servo pads 17, second substrate 23, servo ICs 2 which are servo components
Numerals 0 are collectively disposed on the left side of the virtual line 25 of the head arm 12 (including the spring arm 10).

In the arrangement structure, as described above, the second substrate section 23 can be pulled out from the first substrate section 22 by forming the cut section 21. The second substrate portion 23 is extended from the left side to the right side of the virtual line 25 along the outer periphery of the support shaft portion 11. Therefore, by configuring the FPC 13 as described above, each component can be separately arranged on the read / write side and the servo side around the virtual line 25 by one FPC 13.

As described above, the read / write components 14, 16, 22, 18, and 19 are disposed at the left portion of the head arm 12 separated by the virtual line 25, and at the right portion. Servo components 15, 17,
By arranging 23 and 20, the arrangement position of the read / write signal line 14 and the arrangement position of the servo signal line 15 are separated from each other with the virtual line 25 substantially at the center. Similarly, the arrangement positions of the read / write ICs 18 and 19 and the arrangement position of the servo IC 20 are also separated from each other with the virtual line 25 substantially at the center.

For this reason, the read / write signal line 14 and the read / write ICs 18 and 19 are connected to the servo signal line 1.
5 and the servo IC 20 are not adversely affected, and the positioning accuracy of the actuator 3 can be improved. Further, the read / write ICs 18 and 19 and the servo IC 20 are separately provided with the virtual line substantially at the center. For this reason, each of the ICs 18 to 20 can be arranged at a position where it does not interfere with other mechanical devices, and the size of the magnetic disk device can be reduced.

As described above, the structure of the FPC 13 is constituted by the first substrate portion 22 and the second substrate portion 23, so that the second substrate portion 23 is
The servo IC 20 can be disposed close to the servo head 9 because the servo IC 20 can be pulled out to the servo side of the head arm 4 separated by the above.

On the read / write side, the effect of the servo noise appears most remarkably in a portion from each of the magnetic heads 8 and 9 to each of the ICs 18 to 20. Therefore, by extending the second substrate portion 23 long and disposing the servo IC 20 close to the servo head 9, it is possible to reduce the portion where the influence of the servo noise occurs, thereby also achieving the positioning accuracy of the actuator 3. Can be improved.

On the other hand, as shown in FIG. 3, the tip of the spring arm 10 is generally sharp (narrow), and the read / write head 8 and the servo head 9 are disposed at the tip. Therefore, in this portion, the read / write head 8 and the servo head 9 and the read / write signal line 14 and the servo signal line 15 are arranged closest to each other. Influence is likely to occur.

Therefore, in this embodiment, as shown in FIGS. 1, 3, and 7, the tip of the spring arm 10 is placed at a position between the read / write head 8 and the servo head 9 by a magnetic material. A metal plate 26 was provided. The magnetic metal plate 26 is, for example, an iron plate having a predetermined thickness, and functions as a shielding material. Therefore, due to the structure of the actuator 3, it is possible to reduce the influence of servo noise at the distal end portion of the spring arm where the read / write-side component and the servo-side component are arranged close to each other.
The positioning accuracy of the actuator 3 can be improved.

FIG. 11 shows various shapes of the magnetic metal plate 26. The magnetic metal plate 26a shown in FIG. 7A has a square shape, and the magnetic metal plate 26b shown in FIG. 7B has a shape obtained by abutting two trapezoidal shapes. (C)
The magnetic metal plate 26c shown in FIG. 7 has a trapezoidal shape, and the magnetic metal plate 26d shown in FIG.
Has a rectangular shape. in this way,
The shape of the magnetic metal plate 26 may be any shape as long as the components on the read / write side and the components on the servo side can be electromagnetically shielded.

[0051]

As described above, according to the present invention, the magnetic head for recording / reproducing and the flexible circuit are provided at one portion of the arm separated by a virtual line connecting the center of rotation of the arm and the center of each magnetic head. A recording / reproducing signal line for connecting to a substrate and a semiconductor device for recording / reproducing are provided, and a servo signal line for connecting a magnetic head for servo and a flexible circuit board and a semiconductor device for servo are provided at the other part. Thus, the positions of the recording / reproducing signal lines and the servo signal lines, and the positions of the recording / reproducing semiconductor devices and the servo semiconductor devices are largely separated from each other with the virtual line substantially at the center. For this reason, the semiconductor device for recording / reproducing,
The recording / reproducing signal line does not adversely affect the servo semiconductor device and the servo signal line, and the positioning accuracy of the actuator can be improved. Further, the semiconductor device for recording / reproducing and the semiconductor device for servo are arranged on the arm with the virtual line substantially at the center, so that each semiconductor device does not interfere with other mechanical devices and the size of the magnetic disk device is reduced. Can be achieved.

Further, the first substrate portion can be disposed at one portion of the arm separated by the virtual line, and the second substrate portion can be drawn out to the other portion of the arm separated by the virtual line. Therefore, the wiring of the magnetic head for recording / reproducing, the recording / reproducing signal line, the semiconductor device for recording / reproducing, the magnetic head for servo, the signal line for servo, and the semiconductor device for servo can be performed with one flexible circuit board. Further, since the second substrate portion is drawn out to the other portion of the arm separated by the virtual line, the servo semiconductor device can be disposed close to the servo magnetic head. On the recording / reproducing side, the effect of the servo noise appears most remarkably in a portion from each magnetic head to each semiconductor device. Accordingly, by extending the second substrate portion and disposing the servo semiconductor device close to the servo magnetic head, it is possible to reduce a portion where the influence of servo noise occurs, thereby improving the positioning accuracy of the actuator. Can be.

Further, since a magnetic metal member functioning as a shielding material is interposed between the portion where the recording / reproducing magnetic head is provided and the portion where the servo magnetic head is provided, the servo at the position where the magnetic head is provided is provided. The effect of noise can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining an actuator structure according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining an actuator structure according to an embodiment of the present invention.

FIG. 3 is an enlarged view showing a spring arm.

FIG. 4 is a left side view of the actuator.

FIG. 5 is a right side view of the actuator.

FIG. 6 is a side view of a spring arm.

FIG. 7 is an enlarged view showing the vicinity of a head.

FIG. 8 is an internal plan view of a magnetic disk drive to which an actuator structure according to an embodiment of the present invention is applied.

FIG. 9 is a diagram showing an FPC.

FIG. 10 is a diagram illustrating a state where a second substrate portion is pulled out from the first substrate portion.

FIG. 11 is a view showing the structure of various magnetic metal plates.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc 3 Actuator 4 Head arm 5 VCM 6 Rotating axis 7 Base 8 Read / write head 9 Servo head 10 Spring arm 12a, 12b Arm 13 FPC 14 Read / write signal line 15 Servo signal line 16 R / W pad 17 Servo pad 18, 19 Read / write IC 20 Servo IC 21 Cutting part 22 First substrate part 23 Second substrate part 25 Virtual line 26, 26a to 26d Magnetic metal plate

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tomoo Sugagawa 5400-2 Omori, Higashi-nemoto, Higashi-ne, Higashi-shi, Yamagata Prefecture Yamagata Fujitsu Co., Ltd. (56) References JP-A-63-5717 (JP, A) Hei 1-158605 (JP, A) Japanese Utility Model 3-94617 (JP, U) Japanese Utility Model 3-5296 (JP, U) Japanese Utility Model Hei 1-66694 (JP, U)

Claims (4)

(57) [Claims] An arm (4) having a recording / reproducing magnetic head (8) for performing a magnetic recording / reproducing process on a magnetic disk (1) is provided. By rotating the magnetic disk (1) in the radial direction, the recording / reproducing magnetic head (8) is positioned at a predetermined position on the magnetic disk (1) and at least one of the plurality of arms (4). One arm (4) is equipped with both the recording / reproducing magnetic head (8) and a servo magnetic head (9) for controlling the positioning of the recording / reproducing magnetic head (8). First connected to the recording / reproducing magnetic head (8)
An actuator structure of a magnetic disk drive comprising a flexible circuit board (13) having a substrate portion (22) and a second substrate portion (23) connected to the servo magnetic head (9), The rotation center of the arm (4) and each of the magnetic heads (8,
Assuming an imaginary line (25) connecting the center of the head of (9), the flexible circuit board (13) is connected to the first board part (2).
2) and the second substrate portion (23) can be pulled out independently, and the arm (4) separated by the virtual line (25)
The first portion of the flexible circuit board (13)
And the arm (4) separated by the virtual line (25).
The second part of the flexible circuit board (13)
An actuator structure for a magnetic disk drive, wherein the substrate portion (23) is drawn out and disposed. And a plurality of arms mounted with a recording / reproducing magnetic head for performing a magnetic recording / reproducing process with respect to the magnetic disk. By rotating the magnetic disk (1) in the radial direction, the recording / reproducing magnetic head (8) is positioned at a predetermined position on the magnetic disk (1) and at least one of the plurality of arms (4). One arm (4) is equipped with both the recording / reproducing magnetic head (8) and a servo magnetic head (9) for controlling the positioning of the recording / reproducing magnetic head (8). Flexible in which a recording / reproducing semiconductor device (18, 19) connected to the recording / reproducing magnetic head (8) and a servo semiconductor device (20) connected to the servo magnetic head (9) are arranged. Equipped with a circuit board (13) That the actuator structure of a magnetic disk apparatus, the arm (4) of the rotation center and the magnetic heads (8,
Assuming a virtual line (25) connecting the center of the head of 9), the arm (4) separated by the virtual line (25)
A recording / reproducing signal line (14) connecting the recording / reproducing magnetic head (8) and the flexible circuit board (13), and the recording / reproducing semiconductor device (18, 19).
And the arm (4) separated by the virtual line (25)
A servo signal line (15) for connecting the servo magnetic head (9) and the flexible circuit board (13), and a servo semiconductor device (20) are provided at the other part of the semiconductor device. Actuator structure of magnetic disk drive. 3. The actuator structure of a magnetic disk drive according to claim 1, wherein said flexible circuit board (13) is provided with said recording / reproducing semiconductor device (18, 19) and said recording / reproducing signal line. First substrate portion (22) on which recording / reproducing terminal portion (16) to which (14) is connected is formed.
And a second substrate portion (23) on which the servo semiconductor device (20) is provided and a servo terminal (17) to which the servo signal line (15) is connected is formed. The first substrate part (22) is formed integrally with the virtual line (2).
The second substrate portion (23) is disposed at one portion of the arm (4) separated by 5), and the second substrate portion (23) is pulled out to the other portion of the arm (4) separated by the virtual line (25). An actuator structure for a magnetic disk drive, characterized in that the structure is as follows. 4. The actuator structure of a magnetic disk drive according to claim 1, wherein a portion where said recording / reproducing magnetic head (8) is provided and a portion where said servo magnetic head (9) is provided. An actuator structure for a magnetic disk drive, wherein a magnetic metal member (26) is interposed.