JPH09251733A - Magnetic disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the device superior in assembling workability and capable of preventing occurrence of a connecting failure, etc. SOLUTION: A carriage assembly of the device has plural arms 26a and 26b fitted in their laminated state to a hub of a bearing assembly and a spacer ring 27a positioned between the adjacent arms. A tip part 56a of a flexible printed circuit board(FPC) 56 extended from a substrate unit is fixed to a plate- like supporting part 40 of a holding member 50. The holding member 50 has 1st and 2nd engagement clicks 41 and 42 extended from the supporting part 40, and is fitted to a main body part of the carriage assembly by elastically engaging these engagement clicks 41 and 42 with 1st and 2nd engagement parts 45 and 47 formed on the spacer ring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device having a plurality of magnetic heads.

[0002]

2. Description of the Related Art In recent years, magnetic disk devices have been widely used as memories for storing a large amount of information in electronic devices such as personal computers, laptop computers, and book computers.

A magnetic disk device of this type generally includes a plurality of magnetic disks arranged in a stacked state, a magnetic head assembly having a plurality of magnetic heads for recording and reproducing information on and from the magnetic disks, The magnetic head assembly includes a carriage that movably supports the magnetic head assembly with respect to the magnetic disk, and a voice coil motor that rotates the carriage to move the magnetic head to a desired track position on the magnetic disk.

A plurality of magnetic disks are fixed to a hub of a spindle motor, and are supported coaxially with one another at predetermined intervals in a stacked state. Then, by driving the spindle motor, the magnetic disk is rotated at a predetermined speed.

A magnetic head assembly having a magnetic head includes:
Two magnetic disks are provided for one magnetic disk, and are respectively located opposite to the upper and lower surfaces of the magnetic disk.
For example, in a magnetic disk drive having two magnetic disks, four magnetic head assemblies are provided.

Each magnetic head assembly has a slider on which a magnetic head is formed, and a suspension for applying a predetermined load to the magnetic head. The carriage includes a bearing assembly and a plurality of arms extending from the bearing assembly, and the magnetic head assemblies are fixed to the corresponding arms.

Further, the magnetic disk drive has a circuit board for processing signals to the magnetic head, and this circuit board is electrically connected to a plurality of magnetic heads by the following configuration.

That is, from a rigid circuit board to a strip-shaped flexible printed circuit board (hereinafter referred to as FPC)
Is extended, and a reinforcing plate made of resin or metal is fixed to the back surface of the tip end thereof. The tip of the FPC is screwed and fixed to the bearing assembly portion of the carriage together with the reinforcing plate. Further, a plurality of pads are formed on the surface of the tip of the FPC.

On the other hand, for example, two lead wires extend from each magnetic head. These leads extend along the suspension and arms to near the bearing assembly,
The extended end is soldered to the corresponding pad at the tip of the FPC.

[0010]

In recent years, with the miniaturization and high performance of personal computers and the like on which the magnetic disk drive is mounted, the demand for the magnetic disk drive to have a small size and a large capacity is increasing year by year. In order to increase the capacity of the magnetic disk device, the number of magnetic heads and the number of magnetic disks may be increased, or a high-performance magnetic head and a high-performance magnetic disk may be used.

On the other hand, due to the demand for miniaturization, the density of the components of the magnetic disk drive has been increased, and problems such as deterioration in manufacturability have occurred. In particular, connection between the lead wires of the magnetic head and the circuit board poses a problem.

That is, when the number of magnetic heads and the number of magnetic disks are increased to achieve a large capacity, the number of head lead wires increases. Similarly, the conventional magnetic head has two lead wires per one, but when a high performance magnetic head is used, three to four lead wires are required for each magnetic head, The total number of leads increases.

As the number of lead wires increases, the FPC
It is also necessary to increase the number of pads formed at the tip of the. However, since the width of the FPC tip is substantially determined by the thickness of the magnetic disk device, when the number of magnetic heads is increased or a high-performance magnetic head is used without changing the outer diameter of the entire magnetic disk device. Has
It becomes difficult to increase the area of the FPC tip, particularly the width.

Therefore, in this case, in order to increase the number of pads as the number of lead wires increases, it is necessary to reduce the pad area and the pad interval. In particular, when the FPC tip is screwed and fixed to the carriage as in the conventional case, it is necessary to provide a notch or a through hole for inserting a screw in the FPC tip, and in the fixed state, the FPC tip is fixed on the FPC tip. There is a screw head. for that reason,
At the tip of the FPC, the space for providing pads is small, and it is necessary to further reduce the pad area and the pad spacing.

However, when the pad area and the pad interval are reduced, the work of connecting the lead wire to each pad is troublesome, the workability of assembly is deteriorated, and a connection failure may occur due to an error in the connection location or the like. is there. Further, the head of the screw positioned at the tip of the FPC interferes with the workability, and the lead wire may be caught on the head of the screw to cause disconnection or the like.

The present invention has been made in view of the above points, and an object thereof is to provide a magnetic disk device which is excellent in assembling workability and can prevent occurrence of connection failure and the like.

[0017]

According to a first aspect of the present invention, there is provided a magnetic disk drive comprising: a plurality of magnetic disks stacked at predetermined intervals; and a top surface of each magnetic disk. And a plurality of magnetic heads provided opposite to each other and recording and reproducing information on the magnetic disk, a carriage assembly supporting the magnetic head movably with respect to the magnetic disk, and the carriage assembly. The magnetic head includes a driving unit that rotates to move the magnetic head to a desired position on a magnetic disk, and a board unit that inputs and outputs a read signal and a write signal to and from the magnetic head.

The carriage assembly includes a main body,
And a plurality of arm portions each extending from the main body and supporting the magnetic head. The board unit includes a board body, a strip-shaped flexible printed circuit board extending from the board body, a plurality of connection pads provided at a tip portion of the flexible printed circuit board, and a tip portion of the flexible printed circuit board. A fixed holding member and a plurality of lead wires extending from the magnetic heads to the vicinity of the main body of the carriage assembly and connected to the connection pads, respectively.

The holding member is provided with a plurality of engaging claws that elastically engage the main body of the carriage assembly to hold the tip of the flexible printed circuit board on the main body. I am trying.

According to a fifth aspect of the magnetic disk drive of the present invention, the carriage assembly has an engaging projection protruding from the main body and is fixed to the tip of the flexible printed circuit board. The holding member is open toward the main body of the carriage assembly and has an engaging recess into which the engaging projection is fitted to hold the tip of the flexible printed circuit board on the main body. Is characterized by.

According to the magnetic disk device configured as described above, at the time of assembly, the engaging claws of the holding member are engaged with the main body of the carriage assembly, or the engaging recesses of the holding member are arranged in the carriage assembly. By fitting the protrusions of the main body, the tip of the flexible printed circuit board is fixed to the main body of the carriage assembly. Then, the lead wires extending from the magnetic head are soldered to the plurality of pads provided at the tip of the flexible printed circuit board.

Since the holding member is fixed to the carriage assembly main body by using the engaging claw or the engaging recess, the notch or the through hole for inserting the screw is formed at the tip of the holding member and the flexible printed circuit board. It is not necessary to provide it, and it is possible to secure a sufficient space for providing the pad. Thereby, the area of each pad and the space between the pads can be sufficiently secured, and the workability of connecting the lead wires can be improved. At the same time, since the screw head does not exist at the tip of the flexible printed circuit board, it is possible to further improve the connection workability.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a magnetic disk drive according to the present invention is applied to a hard disk drive (hereinafter referred to as an HDD) will be described in detail with reference to the drawings. As shown in FIG. 1, the magnetic disk drive has a rectangular box-shaped case 10 with an open upper surface, and a top cover (not shown) that is screwed to the case with a plurality of screws to close an upper end opening of the case. ing.

In the case 10, two magnetic disks 12a, 12b, 12c as magnetic recording media, a spindle motor 13 for supporting and rotating these magnetic disks, and recording / reproducing information on / from the magnetic disks are performed. A plurality of magnetic heads, a carriage assembly 14 that movably supports the magnetic heads with respect to the magnetic disks 12a, 12b, 12c, and a voice coil motor (hereinafter VC) that rotates and positions the carriage assembly.
M) 16 and a substrate unit 17 having a preamplifier and the like.

A printed circuit board (not shown) for controlling the operations of the spindle motor 13, the voice coil motor 16, and the magnetic head is screwed to the outer surface of the case 10 via the board unit 17, and is fixed to the bottom wall of the case. Located opposite each other.

Each magnetic disk 12a, 12b has a diameter of 65
It has a thickness of 2.5 mm and has a magnetic recording layer on the upper and lower surfaces. Two magnetic disks 12a, 12b
Are coaxially fitted to a hub (not shown) of the spindle motor 13, and are stacked at a predetermined interval along the axial direction of the hub. Then, the magnetic disks 12a, 1
2b is rotationally driven by a spindle motor 13 at a predetermined speed.

As shown in FIGS. 1-3, the carriage assembly 14 includes a bearing assembly 18 fixed on the bottom wall of the case 10. This bearing assembly 18
A pivot 20 erected on the bottom wall of the case 10 and a cylindrical hub 2 rotatably supported on the pivot through a pair of bearings.
2 and. An annular flange 23 is formed on the upper end of the hub 22, and a screw portion 24 is formed on the outer periphery of the lower end.

The carriage assembly 14 includes six arms 26a, 26b, which are attached to the hub 22.
26c, 26d, 26e, 26f, two spacer rings 27a, 27b, and six magnetic head assemblies 28 supported by each arm.

Each of the arms 26a to 26f is formed of, for example, a stainless steel-based material such as SUS304 into a thin flat plate having a plate thickness of 0.3 mm or less, and a circular through hole 31 is formed at one end, that is, the base end. Are formed.

Each magnetic head assembly 28 includes an elongated suspension 30 formed by a leaf spring, and a magnetic head 32 fixed to the suspension. The base of the suspension 30 is fixed to the distal ends of the arms 26a to 26f by spot welding or bonding, and extends from the arm.

Each magnetic head 32 has a substantially rectangular slider (not shown) and a recording / reproducing thin film head formed on this slider, and is fixed to a gimbal portion formed at the tip of the suspension 30. . Note that the suspension 30 may be formed integrally with the arm using the same material as the arm.

For example, four head lead wires 46 extend from each magnetic head 32 and extend along the side edges of the arm to the base end portion of the arm. Then, the magnetic head assembly 28
The fixed arms 26a to 26f are fitted on the outer periphery of the hub in a state of being stacked on the flange 23 by inserting the hub 22 into the through hole 31. The spacer ring 27a is fitted to the outer periphery of the hub 22 with the spacer ring 27b sandwiched between the arms 26e and 26f, and the spacer ring 27b is fitted between the arms 26e and 26f. Further, a support ring 34 is fitted to the hub 22 and is sandwiched between the arms 26c and 26d.

The bearing assembly 18, the spacer rings 27a and 27b, and the support ring 34 form the main body of the carriage assembly 14. Hub 22
Four arms 26a to 26f fitted around the outer periphery of
The two spacer rings 27 a and 27 b and the support ring 34 are connected to the nut 3 screwed into the thread portion 24 of the hub 22.
6 and the flange 23, and is fixed and held on the outer periphery of the hub 22. Thereby, six arms 26
a to 26d are spaced apart and parallel to each other and extend in the same direction from the hub 22.

The magnetic heads 32 of the magnetic head assembly 28 attached to the arms 26a and 26b are located opposite to each other, and the magnetic heads 32 of the magnetic head assembly 28 attached to the arms 26c and 26d are located opposite to each other. Further, the magnetic heads 32 of the magnetic head assembly 28 attached to the arms 26e and 26f are located facing each other. The arms 26a to 26f and the magnetic head assembly 28 fixed to these arms are rotatable integrally with the hub 22.

The support ring 34 includes two support frames 3 extending in the opposite direction to the arms 26a to 26f.
8 and a coil 44 constituting a part of the VCM 16 is fixed on these support frames.

As can be seen from FIG. 1, when the carriage assembly 14 constructed as described above is incorporated in the case 10, the magnetic disk 12a is located between the arms 26a and 26b, and the magnetic disk 12b is located in the arm 26c. The magnetic disk 12c is located between the arms 26e and 26f. Then, the magnetic head assembly 28 attached to the arms 26a, 26b
The magnetic head 32 contacts the upper and lower surfaces of the magnetic disk 12a, respectively, and holds the magnetic disk 12a from both sides.

Similarly, the magnetic heads 32 attached to the arms 26c and 26d contact the upper surface and the lower surface of the magnetic disk 12b, respectively, and hold the magnetic disk 12b from both sides. Further, the magnetic heads 32 attached to the arms 26e and 26f contact the upper and lower surfaces of the magnetic disk 12c, respectively, and
Is sandwiched from both sides. A predetermined head load is applied to each magnetic head 32 by the spring force of the suspension 30, and is pressed against the surface of the magnetic disk when the magnetic disk is stopped.

On the other hand, as shown in FIG. 1, when the carriage assembly 14 is assembled in the case 10,
The coil 44 fixed to the support frame 38 is the case 1
The VCM 16 is located between a pair of yokes 48 fixed on the upper side of the motor and together with these yokes and a magnet (not shown) fixed to one of the yokes. Therefore, the coil 44
, The carriage assembly 14 rotates, and the magnetic head 32 moves the magnetic disks 12a and 12a.
b and 12c are moved and positioned on the desired track.

As shown in FIGS. 1 and 4, the board unit 17 has a rectangular board body 52 fixed on the bottom wall of the case 10, and a plurality of electronic components 53 are mounted on the board body. A connector 54 and the like are mounted. Also,
The board unit 17 has a strip-shaped flexible printed circuit board (hereinafter, referred to as connection FPC) 56 in which the board body 52 and the carriage assembly 14 are electrically connected. The FPC 56 extends from the substrate main body 52, and a front end portion 56a thereof is fixedly held by the main body of the carriage assembly 14 by a holding member 50 described later. Note that F
The PC 56 is formed integrally with the substrate body 52 by a flexible printed wiring board.

As shown in FIGS. 4 to 6, the FPC 56
Has a large number of conducting wires 58 extending parallel to each other along the axial direction of the FPC. In addition, the tip portion 56 of the FPC 56
a has six pads 6 corresponding to the number of magnetic heads 32.
0 is formed, and the substrate main body 52
It is conducting. Each set of pads 60 has a magnetic head 32.
Four lead wires 46 are provided corresponding to the number of the lead wires 46, and the extending ends of the corresponding lead wires are soldered.

As shown in FIGS. 6 and 7, the holding member 50 for attaching the tip portion 56a of the FPC 56 to the carriage assembly 14 has a substantially rectangular plate-shaped support portion 40.
And a pair of first engaging claws 41 and a pair of second engaging claws 42 extending from the support portion, and are integrally formed of elastic synthetic resin or metal. The tip portion 56a of the FPC 56 is fixed to one surface of the support portion 40 with, for example, an adhesive.

The first engaging claw 41 is the FPC of the supporting portion 40.
56 is provided on the surface opposite to the surface to which it is fixed, extends substantially vertically and parallel to each other from the vicinity of one side edge of the opposite surface, and is separated from each other by a predetermined distance. In addition, the second engagement claw 42 is provided in the support portion 40.
From the vicinity of the other side edge, it extends obliquely in a direction away from the first engaging claw 41, and its tip end is bent in the same direction as the first engaging claw 41.

The holding member 50 to which the front end portion 56a of the FPC 56 is fixed includes the first and second engaging claws 41,
It is attached to the carriage assembly by elastically engaging 42 with the body of the carriage assembly 14.

That is, as shown in FIGS. 1 and 6 to 7, each of the spacer rings 27a and 27b has a claw-shaped first engaging portion 45 extending in one direction from the outer peripheral surface thereof.
And a claw-shaped second engaging portion 47 extending from the outer peripheral surface in a direction opposite to the first engaging portion 45, are integrally provided. Each first engagement portion 45 includes a flat contact surface 52 that contacts the support portion 40 of the holding member 50.

Then, the first engaging claw 41 of the holding member 50.
Are the first engaging portions 4 of the corresponding spacer rings.
5, the second engaging claw 42 is formed to be engageable with
It is formed so that it can be engaged with the second engaging portions 47 of the corresponding spacer rings.

As shown in FIGS. 6 to 8, when the HDD is assembled, the holding member 50 to which the front end portion 56a of the FPC 56 is fixed has the first and second engaging claws 41 and 42 as the spacer of the carriage assembly 14. It is pushed toward these spacer rings in a state of being aligned with the rings 27a and 27b.

Then, the first position located on the upper side in FIG.
The second engaging claws 41 and 42 elastically engage the first and second engaging portions 45 and 47 of the spacer ring 27a, respectively, and hold the spacer ring 27a from both sides. Similarly, the first and second engaging claws 41 and 42 located on the lower side in FIG. 6 have the first and second engaging portions 45 and 47 of the spacer ring 27b, respectively.
Is elastically engaged with the spacer ring 27b and is held in a state of sandwiching the spacer ring 27b from both sides. Therefore, the support portion 40 is held in close contact with the contact surface 52 of the first engagement portion 45.

The pair of first engaging claws 41, when engaged with the first engaging portion 45, have arms 26a and 2a.
6b and between arms 26e and 26f, respectively, and these arms allow spacer rings 27a, 2 and
The movement of 7b along the axial direction is restricted.

In this way, the holding member 50 is attached to the main body of the carriage assembly 14 at a predetermined position by the first and second engaging claws 41 and 42, and the holding member 50 of the FPC 56 fixed to the supporting portion 40 is fixed. The tip portion 56a is fixed to the carriage assembly via a holding member.

After that, the tip portion of the lead wire 46 extending from each magnetic head 32 is attached to a predetermined pad 60 of the FPC 56.
Each of the magnetic heads is electrically connected to the substrate main body 52 via the lead wire 46 and the FPC 56 by soldering.

According to the HDD configured as described above, the first and second engaging claws 4 of the holding member 50 are assembled at the time of assembly.
The tip portion 56a of the FPC 56 can be attached to a predetermined position of the carriage assembly by a simple operation of engaging the spacer rings 1 and 42 with the spacer rings 27a and 27b of the carriage assembly 14.

Then, the first and second engaging claws 41, 4
2 is used to attach the holding member 50 to the carriage assembly 14
Since it is fixed to the main body of the
It is not necessary to provide a notch or a through hole for inserting a screw in the holding member and the FPC tip portion, and it is possible to secure a sufficient space for providing a pad on the FPC tip portion. Thereby, the area of each pad 60 and the space between the pads can be sufficiently secured, and even when the number of lead wires to be connected for increasing the capacity of the HDD is increased, the work of connecting the lead wires can be facilitated. And it becomes possible to perform reliably. As a result, it is possible to improve the connection workability and prevent a connection failure due to an error in the connection location or the like.

Further, since there is no obstacle such as a screw head at the tip of the FPC 56, the connection workability can be further improved, and the lead wire may be caught on the screw head to cause disconnection. It can be lost.

9 and 10 show the essential parts of an HDD according to another embodiment of the present invention. According to this embodiment, the holding member 50 for attaching the tip portion 56a of the FPC 56 to the carriage assembly 14, and the spacer rings 27a, 27b with which the holding member engages.
The configuration of the engaging portion of is different from that of the above-described embodiment.

That is, according to this other embodiment,
The holding member 50 does not include engaging claws, but includes only the substantially rectangular plate-shaped support portion 40. The tip portion 56a of the FPC 56 is fixed to one surface of the support portion 40 with an adhesive or the like. Further, on the other surface of the support member 40, a pair of bottomed holes 6 functioning as engagement recesses.
8 are formed at a predetermined interval. Each bottomed hole 68
Are formed to have a diameter slightly smaller than the diameter of the fixing pin described later.

Further, each of the spacer rings 27a and 27b is formed integrally with a protruding portion 64 extending outward in the radial direction. The protrusion 64 has a flat contact surface 52 extending in the tangential direction of the spacer ring, and a bottomed hole 70 having a predetermined diameter is formed in this contact surface. A columnar fixing pin 66 having a diameter slightly larger than that of the bottomed hole 70 is press-fitted into the bottomed hole 70 and vertically protrudes from the contact surface 52. Each fixing pin 66 functions as a protrusion in this invention.

When assembling the HDD, the tip portion 56 of the FPC 56
The holding member 50 to which a is fixed has the pair of bottomed holes 68 and the spacer rings 27 a, 2 a of the carriage assembly 14.
In a state of being aligned with the pair of fixing pins 66 projecting from 7b, they are pushed toward these spacer rings.

Then, the pair of fixing pins 66 are attached to the holding member 5.
0 is press-fitted into the corresponding bottomed holes 68, and the supporting portion 4
0 is held in close contact with the contact surfaces 52 of the spacer rings 27a and 27b. In this way, the holding member 50 is
The tip end portion 56a of the FPC 56 fixed to the main body of the carriage assembly 14 by the fixing pin 66 and fixed to the support portion 40 is fixed to the carriage assembly via the holding member. Here, since the two fixing pins 66 are provided, the rotation of the holding member 50 with respect to the carriage assembly 14 is also reliably prevented.

After that, the tip end portion of the lead wire 46 extending from each magnetic head 32 is attached to a predetermined pad 60 of the FPC 56.
Each of the magnetic heads is electrically connected to the substrate main body 52 via the lead wire 46 and the FPC 56 by soldering.

The rest of the configuration is the same as that of the above-described embodiment, and the same reference numerals are given to the same portions and detailed description thereof will be omitted. Also in the HDD according to the other embodiment configured as described above, the holding member 5 is assembled at the time of assembly.
By simply engaging the fixing pins 66 of the spacer rings 27a and 27b with the bottomed holes 68 of 0, the FPC
The tip portion 56a of 56 can be attached to a predetermined position of the carriage assembly.

According to the above construction, it is not necessary to provide a notch or a through hole for inserting a screw in the holding member 50 and the tip of the FPC as in the conventional case, and it is sufficient to provide a pad at the tip of the FPC. It is possible to secure a large space. As a result, the area of each pad 60 and the space between the pads can be sufficiently secured, and even when the number of lead wires connected to increase the capacity of the HDD increases,
The lead wire connection work can be performed easily and surely. As a result, it is possible to improve the connection workability and prevent a connection failure due to an error in the connection location or the like.

Further, since there is no obstacle such as a screw head at the tip of the FPC 56, the connection workability can be further improved, and the lead wire may be caught on the screw head to cause disconnection. It can be lost.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified within the scope of the present invention. For example, the number of magnetic heads is not limited to six, and can be increased or decreased according to the number of magnetic disks. In addition, in the above-described embodiment, the holding member includes two sets of the first and second sets.
However, the pair of first and second engaging claws is used.
May be provided, and if the number of spacer rings increases as the number of magnetic disks increases, three or more sets of first and second engaging claws may be provided. May be.

Further, in the above-mentioned other embodiment,
The protrusion provided on the spacer ring is not limited to the press-fitted fixing pin, and may be formed integrally with the spacer ring.

[0065]

As described above in detail, according to the present invention, the engaging claws of the holding member to which the front end portion of the flexible printed circuit board is fixed are engaged with the main body of the carriage assembly, or the holding member. By fitting the engagement recess of the to the protrusion of the carriage assembly main body, the tip of the flexible printed circuit board is fixed to the main body of the carriage assembly.
It is possible to provide a magnetic disk device which is excellent in assembling workability and can prevent occurrence of connection failure and the like.

[Brief description of drawings]

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

FIG. 2 is an exploded perspective view of a carriage assembly provided in the HDD.

FIG. 3 is a side view of the carriage assembly.

FIG. 4 is a perspective view of the board unit.

FIG. 5 is a plan view showing an enlarged front end portion of the FPC of the board unit.

FIG. 6 is a perspective view showing a tip portion of the FPC, a holding member, and a pair of spacer rings.

FIG. 7 is a plan view showing a state in which the holding member is attached to a spacer ring.

FIG. 8 is a side view showing a state where the holding member to which the FPC is fixed is attached to the carriage assembly.

FIG. 9 is a FP of an HDD according to another embodiment of the present invention.
The perspective view which shows the front-end | tip part of C, a holding member, and a pair of spacer rings.

FIG. 10 is a plan view showing a state where the holding member is attached to a spacer ring in the other embodiment.

[Explanation of symbols]

12a, 12b, 12c ... Magnetic disk 14 ... Carriage assembly 16 ... Voice coil motor 17 ... Board unit 18 ... Bearing assembly 22 ... Hub 23 ... Flange 24 ... Screw part 26a, 26b, 26c, 26d, 26e, 26f ... Arm 27a , 27b ... Spacer ring 28 ... Magnetic head assembly 32 ... Magnetic head 40 ... Support part 41 ... First engaging claw 42 ... Second engaging claw 45 ... First engaging part 46 ... Lead wire 47 ... 2. Engaging portion 50 ... Holding member 56 ... FPC 56a ... Tip portion 60 ... Pad 66 ... Fixing pin 68, 70 ... Bottom hole

Claims (7)

[Claims] 1. A plurality of magnetic disks stacked at predetermined intervals, and a plurality of magnetic heads provided on the upper surface and the lower surface of each magnetic disk so as to face each other for recording and reproducing information. A carriage assembly that movably supports the magnetic head with respect to the magnetic disk; drive means for rotating the carriage assembly to move the magnetic head to a desired position on the magnetic disk; A carriage unit for inputting and outputting a read signal and a write signal, and the carriage assembly has a main body, and a plurality of arm portions extending from the main body and supporting the magnetic head, respectively. The board unit includes a board body and a strip-shaped flexible printed circuit board extending from the board body. A plurality of connection pads provided at the tip of the flexible printed circuit board, a holding member fixed to the tip of the flexible printed circuit board, and extending from each magnetic head to the vicinity of the main body of the carriage assembly. And a plurality of lead wires respectively connected to the connection pads, the holding member elastically engaging the main body of the carriage assembly to hold the tip of the flexible printed circuit board on the main body. A magnetic disk drive comprising a plurality of engaging claws. 2. The engaging claw of the holding member is engaged with the main body, and the first engaging claw extending between the arm portions and the first main body are sandwiched between the first engaging claw. The magnetic disk device according to claim 1, further comprising a second engaging claw facing the engaging claw. 3. A carriage assembly comprising: a rotatable hub having one end formed with a flange and the other end formed with a screw portion; and a bearing assembly having a nut screwed to the screw portion. Each of the plurality of arms has a through hole through which the hub is inserted, is laminated on the flange, and is fixed to a plurality of arms extending from the hub to form the arm portion and extending ends of the arms. And a plurality of magnetic head assemblies each including the magnetic head, and located between two adjacent arms mounted on the outer circumference of the hub, between the plurality of arms and a flange and a nut of the bearing assembly. 3. A spacer sandwiched between and, wherein the spacer has a plurality of engaging portions with which the engaging claws of the holding member are engaged.
The magnetic disk device according to 1. 4. The holding member has a plate-shaped support portion that is fixed to the flexible printed circuit board and abuts against the main body of the carriage assembly, and the engagement claw extends from the support portion to the carriage. 2. An extension to the body of the assembly.
3. A magnetic disk drive according to item 2. 5. A plurality of magnetic disks stacked at a predetermined interval, and a plurality of magnetic heads provided on the upper surface and the lower surface of each magnetic disk so as to face each other for recording and reproducing information. A carriage assembly that movably supports the magnetic head with respect to the magnetic disk; drive means for rotating the carriage assembly to move the magnetic head to a desired position on the magnetic disk; The carriage assembly includes a substrate unit for inputting and outputting a read signal and a write signal, and the carriage assembly includes a main body, a plurality of arm portions that extend from the main body and respectively support the magnetic head, and project on the main body. The board unit includes a board body and a board body. -Shaped flexible printed circuit board, a plurality of connection pads provided at the tip of the flexible printed circuit board, a holding member fixed to the tip end of the flexible printed circuit board, the magnetic head to the carriage assembly. And a plurality of lead wires each connected to the connection pad, the holding member being open toward the body of the carriage assembly and having the engagement projection fitted therein. A magnetic disk drive having an engaging recess for holding the tip of the flexible printed circuit board on the main body. 6. The magnetic disk drive according to claim 5, wherein the carriage assembly has an engagement pin fixed to the main body and having the projection. 7. The holding member has a plate-shaped support portion which is fixed to the flexible printed circuit board and abuts against the main body of the carriage assembly, and the engagement recess is formed in the support portion. 7. The magnetic disk device according to claim 5 or 6, wherein