JPH10269720A - Flexible cable assembly, manufacture thereof and disk drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the clearance between the base bottom surface and the top cover of a flexible cable assembly and an enclosure case. SOLUTION: An FPC cable assembly has an FPC cable 101, reinforcing films 102, 103, and 104, and reinforcing plates 105, 106, and 107. The reinforcing films 102 and 103 are laminated to a first mounting part 111 and a second mounting part 113 of the FPC cable 101, and the reinforcing plates 105 and 106 are laminated via the reinforcing films 102 and 103. By laminating a reinforcing film to the mounting parts 111 and 113 in advance, the deformation of the mounting parts 111 and 113 can be suppressed when laminating the reinforcing plate, thus improving the lamination accuracy of the FPC cable 101 and the reinforcing plates 105 and 106, and hence securing a clearance with the enclosure case.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a flexible printed circuit (FPC).
The present invention relates to a flexible cable assembly in which a reinforcing plate is bonded to a flexible cable such as a printed cable, a method of manufacturing the same, and a disk drive device using the flexible cable assembly. In particular, the bonding accuracy of the flexible cable and the reinforcing plate can be improved. The present invention relates to a flexible cable assembly capable of securing a clearance with an enclosure case (base and top cover) of a disk drive device when mounted on the disk drive device.

[0002]

2. Description of the Related Art A disk drive device has an enclosure case in which a substantially box-shaped base having a shallow bottom is closed with a top cover. In the enclosure case, a disk such as a magnetic disk as a recording medium, and a spindle motor for rotating the disk are housed. In the enclosure case, a carriage and a voice coil motor (VCM) for rotating the carriage are housed. A carriage has a head slider having a transducer head for reading and writing information from and to a disk;
A voice coil constituting a CM is mounted. A circuit board for controlling the spindle motor and the VCM and transmitting / receiving information to / from the converter head is mounted on the outer surface of the enclosure case.

An FPC cable assembly is used to connect the circuit board to the transducer head and the voice coil. The FPC cable assembly has an FPC cable and a reinforcing plate bonded to the FPC cable.
The FPC cable includes a transmission unit in which a first attachment unit and a second attachment unit are integrally formed at both ends of a strip-shaped flexible unit,
It is a flat cable including a component mounting portion integrally formed with a second mounting portion. Further, a wiring pattern for transmitting read / write information of the transducer head and supplying current to the voice coil is formed on the FPC cable.

The first mounting portion is mounted on the carriage by a reinforcing plate, and follows the turning of the carriage. Further, the second mounting portion is fixed to the enclosure case by another reinforcing plate. Each reinforcing plate is bonded to one side of the FPC cable. The flexible portion between the first mounting portion and the second mounting portion bends according to the turning of the carriage. The transmission unit is fixed to the carriage and the base such that the cable surface is perpendicular to the bottom surface of the base and the top cover surface.

[0005] In the step of bonding the flexible cable and the reinforcing plate, a bonding tool having positioning pins is used. By inserting positioning holes provided in the flexible cable and the reinforcing plate into the positioning pins, respectively. Position the flexible plate with respect to the reinforcing plate, or position the flexible cable with respect to the reinforcing plate.

[0006]

As the disk drive becomes thinner, the vertical space in the enclosure provided to the FPC cable (particularly, the transmission section) tends to be smaller. Along with this, it has become difficult to secure sufficient clearance for preventing friction between the flexible FPC cable and the base bottom surface or the top cover.

[0007] In the bonding step of the FPC cable and the reinforcing plate, the first mounting portion or the second mounting portion of the FPC cable may be deformed depending on how the FPC cable is pulled, thereby causing a bonding displacement. is there. This misalignment involves rotation of the flexible part. Due to this rotational displacement, the position of the flexible portion in the disk drive device largely shifts toward the base bottom side or the top cover side, and the clearance becomes small. Therefore, if the bonding displacement is improved, the above clearance can be secured, and the contact between the FPC cable and the enclosure case can be avoided.

In view of the above problems, the present invention improves the bonding accuracy of a flexible cable and a reinforcing plate, thereby securing a clearance between the flexible cable and an enclosure case in a disk drive device and a method of manufacturing the same. The purpose is to provide.

[0009]

In order to achieve the above object, a flexible cable assembly according to the present invention has a laminated structure in which a reinforcing plate is bonded to a bonding portion between a flexible cable and a reinforcing film. Is what you do. As a manufacturing procedure of the flexible cable assembly, a reinforcing film is bonded to the flexible cable in advance, and a reinforcing plate is further bonded to the bonded portion.

[0010] By bonding the reinforcing film to the flexible cable in advance, deformation of the flexible cable in the bonding step with the reinforcing plate can be suppressed, thereby improving the bonding accuracy of the flexible cable and the reinforcing plate. Therefore, the clearance with the enclosure case in the disk drive device can be secured.

[0011]

1 to 3 are partially exploded views showing the structure of a disk drive device according to an embodiment of the present invention. The disk drive device shown in FIGS. 1 to 3 includes a disk 1, a spindle motor 2, a carriage 3, a head slider 4, and a voice coil motor (VC).
M) 5 and an FPC cable assembly (flexible cable assembly) 10
It is stored in. Further, the circuit board 7 is mounted on the outer surface (lower surface) of the enclosure case 6.

FIG. 1 shows a disk 1 as a data recording medium.
As shown in (1), it is fixed to the outer periphery of the spindle shaft 21 of the spindle motor 2 arranged on the base 61 of the enclosure case 6. Spindle motor 2 is disk 1
To rotate. Here, the two disks 1a and 1b are
In the meantime, a clamp 12 is arranged via a spacer 11 on the upper surface of the disk 1a and is coaxially fixed to a spindle 21.

As shown in FIG. 2, the carriage 3 includes an intermediate portion 31, a head arm 32 extending from one end of the intermediate portion 31, and a coil arm 3 extending from the other end of the intermediate portion 31.
And 3. The intermediate portion 31 is rotatably fitted via a bushing 34 to a revolving shaft 35 projecting from the base 61. At the tip of the head arm 32, a head slider 4 having a transducer head 41 for reading and writing information from and to the disk 1 is mounted. A voice coil 51 is mounted on the coil arm 33.

On the inner surface of the yoke 52 fixed to the base 61, permanent magnet bodies 53a and 53b are provided. The coil arm 33 is inserted into a space between the permanent magnet bodies 53a and 53b. Voice coil 51 and permanent magnet bodies 53a, 5
3b constitutes VCM5. The VCM 5 rotates the carriage 3 to move the transducer head 41 substantially in the radial direction of the disk 1.

As shown in FIG. 3, the enclosure case 6 is formed by closing the open upper surface of a substantially box-shaped base 61 having a shallow bottom with a top cover 62. The top cover 62 is screwed to the open upper surface of the base 61 via a seal frame 63.

On the circuit board 7, a connector connection pattern 71 is provided.
Are formed. Further, a CPU, a spindle driver, a VCM driver (all not shown), and the like are mounted on the circuit board 7. The CPU controls the operation of the disk drive device and sends and receives information to and from the transducer head 41. The spindle driver drives the spindle motor 2 according to a command from the CPU. VCM driver is CP
A VCM current is supplied to the voice coil 51 according to a command from U to drive the VCM 5.

The first mounting portion 111 of the FPC cable assembly 10 is mounted on a side surface of the carriage 3, and
The second mounting portion 113 of the C cable assembly 10 is fixed to the base 61. FPC cable assembly 1
The connector 131 having a spring pin is mounted on the 0 connector mounting portion 116. The connector 131 is inserted into a connector insertion port 64 provided in the base 61. The spring pins of the connector 131 abut against and are connected to the connector connection pattern 71 formed on the circuit board 7. The connector mounting section 116 is a connector 131
And the base 61 at the periphery of the connector insertion port 64 via a seal frame 65 mounted on the periphery of the connector 61. F
The PC cable assembly 10 transmits information read from the disk 1 by the transducer head 41 to the circuit board 7, and transmits information from the circuit board 7 to the transducer head 41. The FPC cable assembly 10 supplies a VCM current from a VCM driver of the circuit board 7 to the voice coil 51.

4A and 4B are views showing the structure around the carriage 3, wherein FIG. 4A is an exploded perspective view, FIG. 4B is a top view, and FIG. 4C is a front view. FIGS. 5A and 5B are bending structure diagrams of the FPC cable assembly 10, in which FIG. 5A is a top view, FIG. 5B is a front view, and FIG. FIGS. 6A and 6B are exploded structural views (structure diagrams before bending) of the FPC cable assembly 10, in which FIG. 6A is a top view (view from the front surface), and FIG. 6B is a front view (view from the end surface). . FIG. 7 shows the reinforcing films 102, 103, 104 and the reinforcing plates 105, 10 for the FPC cable 101 of the FPC cable assembly 10.
FIG. 6 is a development view showing bonding positions of Nos. 6 and 107. 8 is a structural diagram of the reinforcing plate 105, FIG. 9 is a structural diagram of the reinforcing plate 106, and FIG. 10 is a structural diagram of the reinforcing plate 107. 8A to 10, (a) is a top view, (b) is a front view,
(C) is a left side view.

In FIG. 4, the head arm 32 extends horizontally from the side surface of the intermediate portion 31. Here, three head arms 32a, 32b, and 32c extend in a comb shape. Head arms 32a and 32c each have one suspension assembly 36a, 36d. The head arm 32b has two suspension assemblies 36b and 36c. The suspension assembly 36 has a head slider 4 having a transducer head 41 mounted at the tip thereof. The two disks 1a and 1b shown in FIG.
a and 36b and between 36c and 36d. A coil arm 33 on which the voice coil 51 is mounted is provided from the side of the intermediate portion 31 opposite to the extension of the head arm 32.
Extend horizontally.

An FPC cable support 37 is provided on one side of the intermediate portion 31 between the extension of the head arm 32 and the extension of the coil arm 33. A mounting bracket 153 (refer to FIG. 8 for a detailed structure) of the FPC cable assembly 10 is screwed to the FPC cable support portion 37. Head wire 42 from transducer head 41
Is clamped to the edge of the head arm 32 and
Wire bracket 152 of PC cable assembly 10
(See FIG. 8 for the detailed structure.) The lead wire is clamped to the first mounting portion 111 of the FPC cable assembly 10 (see FIG. 6 for the detailed structure), and the head wire pad electrode ( It is soldered to 122) in FIG. In addition, the lead wire 54 of the voice coil 51 is soldered to a voice coil pad electrode (123 in FIG. 6) formed on a routing portion 114 (see FIG. 6 for a detailed structure) of the FPC cable assembly 10.

As shown in FIGS. 6 and 7, the FPC cable assembly 10 includes an FPC cable (flexible cable) 101 and reinforcing films 102, 103, 1 and 2.
04 (shaded portions in FIG. 7), reinforcing plates 105, 10
6, 107.

The FPC cable 101 is connected to the first mounting portion 1
11, a flexible portion 112, a second mounting portion 113, a routing portion 114, an electric component mounting portion 115, and a connector mounting portion 116 are integrally formed as a flat cable.
The first mounting portion 111 and the second mounting portion 113 are integrally formed on both ends in the longitudinal direction of the belt-shaped flexible portion 112, respectively. The first attachment part 111, the flexible part 112, and the second attachment part 113 constitute a belt-shaped transmission part 117. The routing section 114 is formed integrally with the first mounting section 111 and extends in a direction perpendicular to the transmission section 117.

A substantially rectangular electrical component mounting portion 115 is integrally formed at one end forming one long side of the transmission portion 117 and one side of the second mounting portion 113. Electrical component mounting section 115
A connector mounting portion 116 is integrally formed on the side facing the second mounting portion 113. Electrical component mounting unit 1
15 and the connector mounting section 116 extend in a direction perpendicular to the transmission section 117. The electric component mounting section 115 and the connector mounting section 116 constitute a component mounting section 118. In other words, the FPC cable 101 is such that, in the unfolded structure, the drawing part 114 and the component mounting part 118 are integrally formed at both ends of the belt-shaped transmission part 117 in a crank shape.

The FPC cable 101 has a signal line 121a for connecting to the converter head 41 and a VCM current line 121b for connecting to the voice coil 51.
Are formed. An electronic element such as an AE chip 132, a resistor 133, and a capacitor 143 for amplifying a transmission signal is provided in the middle of the signal line 121a.

A head wire pad electrode 122 is formed on the surface of the first mounting portion 111 with an opening. Further, a voice coil pad electrode 123 is formed on the surface of the routing portion 114 with an opening. On the back surface of the first mounting portion 111,
A reinforcing film 102 for suppressing deformation of the first mounting portion 111 when the reinforcing plate 105 is bonded is bonded. Further, a reinforcing plate 105 for attaching the first mounting portion 111 and the routing portion 114 to the carriage 3 is attached to the reinforcing film 102. Positioning holes 111a, 111b, 111c are formed in a portion where the first attachment portion 111 and the reinforcing film 102 are bonded. The drawing portion 114 has a screw hole 114h.
And engaging holes 114k and 114l are formed.

As shown in FIG. 8, the reinforcing plate 105 includes a wire bracket 152 and a mounting bracket 1 attached to the main body 151.
53 are integrally formed. The main body 151 has
Positioning holes 151a, 151b, 151c are formed. The surface 154 of the main body 151 is flat,
It is bonded to the reinforcing film 102. An engagement protrusion 151k is formed on a back surface 155 of the main body 151. The wire bracket 152 protrudes from one end surface of the main body 151. The head bracket 4 is attached to the wire bracket 152.
2 (see FIG. 4) is formed with a groove 156 for clamping. The mounting bracket 153 protrudes from the back surface 155 of the main body 151. The mounting bracket 153 includes
A screw hole 153h and an engagement projection 153l are formed.

First mounting portion 111 and reinforcing film 102
6 and 7, the position of the positioning holes 111a and 151a,
b and 151b, and positioning holes 111c and 15
1c are attached so as to match each other.

The reinforcing plate 1 is provided on the back surface of the second mounting portion 113.
A reinforcement film 103 for suppressing deformation of the second mounting portion 113 at the time of bonding at 06 is bonded. Further, a reinforcing plate 106 for fixing the second mounting portion 113 to the base 61 is attached to the reinforcing film 103. Also, positioning holes 113d, 1d are provided in the bonding portion between the second mounting portion 113 and the reinforcing film 103.
13e are formed.

As shown in FIG. 9, the reinforcing plate 106 is formed by integrally forming a side plate 161 and a bottom plate 162 so as to have an L-shaped cross section. The side plate 161 has a positioning hole 16
1d and 161e are formed. The bottom plate 162 has a screw hole 162i and engagement holes 162m and 162n. Inner surface 163 and outer surface 1 of side plate 161
64, the inner surface 165 and the outer surface 166 of the bottom plate 162 are both flat. Side plate outer surface 164 is reinforcing film 1
03.

The second mounting portion 113 and the reinforcing film 103
6 and 7, the reinforcing plate 106 and the reinforcing plate 106 are bonded so that the positions of the positioning holes 113d and 161d and the positions of the positioning holes 113e and 161e match.

An AE chip pad electrode 124 and an electronic element pad electrode 125 are provided on the surface of the
AE chip 132, resistor 1
Electrical components such as 33 and a capacitor 134 are mounted. AE chip 132 is AE chip pad electrode 124
The resistor 133 and the capacitor 134 are soldered to the electronic element pad electrode 125, respectively. On the back surface of the electric component mounting section 115, the electric component mounting section 115
Is fixed to the base 61, and a reinforcing plate 107 for securing the flatness of the electric component mounting portion 115 when soldering the AE chip 132 or the like is bonded. The electric component mounting portion 115 has positioning holes 115f and 115g.
And a screw hole 115j.

As shown in FIG. 10, the reinforcing plate 107 is formed by integrally forming a thick plate 171, a thin plate 172, and a middle plate 173 on a plane. The center plate 173 has a positioning hole 173.
f, screw holes 173i, engagement projections 173m, 173n
Are formed. A screw hole 171j is formed in the thick plate 171. The thin plate 172 has a positioning hole 172g. The surface 174 of the thick plate 171 and the thin plate 172
The surface 176 of the intermediate plate 173 and the surface 178 of the middle plate 173 form one plane, and are bonded to the back surface of the electric component mounting portion 115. The back surface 175 of the thick plate 171 and the back surface 17 of the thin plate 172
7 and the back surface 179 of the middle plate 173 are stepped from each other. When the FPC cable assembly 10 is bent as shown in FIG. 5, the bottom plate inner surface 165 of the reinforcing plate 106 shown in FIG. At this time, the thick plate back surface 175 and the bottom plate outer surface 166 form one plane.

As shown in FIGS. 6 and 7, the electric component mounting portion 115 and the reinforcing plate 107 are positioned with positioning holes 115f.
And 173f, and positioning holes 115g and 172
g match, and screw holes 115j and 17
1j are matched.

A connector pad electrode 126 is formed on the surface of the connector mounting portion 116, and a connector 131 having a spring pin 131a for connecting the wiring pattern 121 to the circuit board 7 (see FIG. 3) is mounted. Have been. The connector 131 is a connector pad electrode 1
26 is soldered. On the back surface of the connector mounting portion 116, a reinforcing film 1 for securing the flatness of the connector mounting portion 116 when soldering the connector 131 is provided.
04 is pasted. A screw hole 116 is provided in a portion where the connector mounting portion 116 and the reinforcing film 104 are bonded.
i, 116j and an engagement hole 116m are formed.

The manufacturing process of the unfolded FPC cable assembly 10 shown in FIGS. 6 and 7 will be described below. 11 to 16 are diagrams illustrating an example of a manufacturing process of the FPC cable assembly 10. First, as shown in FIG. 11, an FPC cable pattern 202 is formed on a base film material 201a. That is, the base film material 2
A wiring pattern 121 (see FIG. 6) is formed by laminating a conductive film (not shown) on 01a with an adhesive and patterning the conductive film. Next, the wiring pattern 12 of the base film material 201a
The base film material 201b is attached to the surface on the side where 1 is formed using an adhesive, and
Pad openings are formed to expose the head wire pad electrode 122, the voice coil pad electrode 123, the AE chip pad electrode 124, the electronic element pad electrode 125, and the connector pad electrode 126 (see FIG. 6).

As the base film materials 201a and 201b, polyimide (for example, product name "Kapton" manufactured by NOK) is used here. The thickness of the base film materials 201a and 201b is, for example, about 0.5 [mill] (about 12.5 [μm]). Therefore 201a and 201b
Film material 201 having a structure in which
Is about 1 [mill] (about 25 [μm]).

Next, as shown in FIG. 12, the reinforcing film material 203 is punched into a predetermined shape, and a reinforcing film pattern 2 is formed.
04 is manufactured. Here, as the reinforcing film material 203, polyetherimide (for example, trade name “Ultem 1000” manufactured by Mektron) is used. Reinforcement film material 2
03 is, for example, 3 to 5 [mill] (75 to 12).
5 [μm]), which is about 3 to
5 times as thick.

Next, as shown in FIG. 13, a reinforcing film pattern 204 is bonded to the base film material 201a using an adhesive. The reinforcing film pattern 204
The reinforcing films 102 to 104 (see FIG. 7) are provided, and the planned areas of the first mounting portion 111, the second mounting portion 113, and the connector mounting portion 116 (see FIG. 7) in the FPC cable pattern 202 are shown. FP to include
It is bonded to the C cable pattern 202.

Next, as shown in FIG. 14, the FPC cable pattern 202 has a screw hole (the screw hole 114 shown in FIG. 7).
h, 115j, 116i, 116j), engaging holes (engaging holes 114k, 114l, 116m shown in FIG. 7), and positioning holes 111a, 111b, 111c, 113d, 1
13e, 115f, and 115g are opened (however, screw holes and engagement holes are not shown in FIG. 14), an FPC cable pattern 202 is punched from the base film material 201, and the FP with the reinforcing films 102 to 104 bonded thereto.
The C cable 101 is formed. FPC cable 101
Has reinforcing films 102 to 104 bonded to the back surface, that is, the base film material 201a side, and has a pad opening (not shown) formed on the front surface, that is, the base film material 201b side.

Next, as shown in FIG. 15 and FIG.
(Refer to FIGS. 8 to 10 for a detailed structure). Reinforcement plates 105 and 10
6 is FP through reinforcing films 102 and 103, respectively.
It is bonded to the C cable 101. That is, the reinforcing plate 1
05 and 106 are reinforcing films 102, 10
3 is pasted. The bonding tool 301 includes a flat portion 311 and positioning pins 312a, 321b, 312c, 312d, and 312 that stand upright on the flat portion 311.
e. The positioning pins 312a to 312e are
Positioning holes 111a, 11 in PC cable 101
1b, 111c, 113d, 113e, 115f, 11
Each of them is arranged at a position on the flat portion 311 corresponding to 5 g.

First, the back surface of the FPC cable 101 faces the flat portion 311 and the positioning pins 312d and 312e respectively have positioning holes 111a, 111b, 111c and 1c.
13d, 113e, 115f, 115g are engaged,
The FPC cable 101 is arranged on the flat part 311 (FIG. 15). Next, the main body surface 154 of the reinforcing plate 105 faces the flat portion 311 and the positioning holes 151a, 151b, 1
51c are positioning pins 312a, 312b, 3
12c, the reinforcing plate 105 is brought close to the reinforcing film 102 while the positioning holes and the positioning pins are engaged, and the reinforcing plate 105 is bonded to the reinforcing film 102 with an adhesive. Similarly, the side plate outer surface 154 of the reinforcing plate 106
Faces the flat portion 311 and the positioning holes 161d, 16
1e is engaged with the positioning pins 312d and 312e, respectively, and the reinforcing plate 106 is attached to the reinforcing film 102 with an adhesive.
Are bonded together. Also, the surfaces 174, 176, and 178 of the reinforcing plate 107 face the flat portion 311 and the positioning holes 173f and 172g are positioned on the positioning pins 312f.
312g, and a reinforcing plate 107 is attached to the back surface of the FPC cable 101 with an adhesive (FIG. 1).
6).

Then, on the surface of the FPC cable 101, a connector 131, an AE chip 132, a resistor 133,
The capacitors 134 and the like are soldered, and FIGS.
Is manufactured. Since the reinforcing plate 107 does not need to be positioned with high precision with respect to the FPC cable 101, the reinforcing plate 107 is directly bonded to the FPC cable 101 without using a reinforcing film.

In the conventional FPC cable assembly, as shown in FIG. 17, the first mounting portion 111 and the reinforcing plate 105 are not bonded to the first mounting portion 111 and the second mounting portion 113 without bonding a reinforcing film. , And the second mounting portion 113 and the reinforcing plate 106 are directly bonded to each other, so that the first mounting portion 111 and the second mounting portion 113
When the positioning holes provided in the mounting tool 301 are inserted into the positioning pins 312 of the bonding tool 301, the first mounting portion 111 and the second mounting portion 113 (particularly, the positioning holes) are deformed,
As a result, the first mounting portion 111 and the reinforcing plate 105, and the second mounting portion 113 and the reinforcing plate 106 are misaligned, which may be accompanied by the misalignment of the first mounting portion 111 and the reinforcing plate 105. A rotational displacement 321 of the flexible portion 112 and a rotational displacement 322 of the flexible portion 112 caused by a displacement of the bonding between the second mounting portion 113 and the reinforcing plate 106 occur, and these rotational displacements are caused by the enclosure case 6 and the flexible portion. This has been a factor in reducing the clearance of 112.

However, according to the FPC cable assembly 10 of the present invention, the reinforcing films 102 and 103 are bonded to the first mounting portion 111 and the second mounting portion 113 in advance, so that the FPC cable assembly is provided at the bonded portion. When the positioning hole is inserted into the positioning pin 312 of the bonding tool 301, the deformation of the first mounting portion 111 and the second mounting portion 113 can be suppressed, so that the first mounting portion 111, the reinforcing plate 105, And the bonding accuracy of the second mounting portion 113 and the reinforcing plate 106 can be improved,
Rotational deviation of the flexible portion 112 can be suppressed.

FIGS. 18 and 19 are views for explaining a manufacturing process of a conventional FPC cable assembly. FIG.
8 corresponds to the step shown in FIG. 12, and FIG. 19 corresponds to the step shown in FIG. As shown in FIG. 17, also in the conventional FPC cable assembly, since the reinforcing film 104 is bonded to the connector mounting portion 116, the conventional FPC cable assembly shown in FIGS.
FIG. 12 and FIG. 13
The manufacturing process of the FPC cable assembly 10 shown in FIG.
Except that the shape of the conventional reinforcing film pattern 404 was changed to the reinforcing film pattern 204, the working procedure and the material used (the reinforcing film material 203) were the same.
Therefore, the manufacturing cost of the FPC cable assembly 10 is
It is the same as a conventional FPC cable assembly, despite the addition of reinforcement films 102 and 103.

The process of folding the unfolded FPC cable assembly 10 shown in FIGS. 6 and 7 to produce the FPC cable assembly 10 shown in FIG. 5 will be described below. First, between the AA ′ of the FPC cable 101 shown in FIGS. 6 and 7, the routing part 114 is folded back to the back side of the main body part 151 of the reinforcing plate 105, and the engagement hole 114 k of the wiring part 114 is Engagement projection 151
and k. In addition, the leading portion 114 is bent at right angles so that the surface becomes concave between BB ′,
14l is engaged with the engaging projection 153l of the mounting bracket 153 of the reinforcing plate 105. At this time, screw holes 114h and 1
The position of 53h matches.

Next, the engagement holes 162m and 16
2n are respectively engaged with the engagement protrusions 173m and 173n of the reinforcing plate 107, and the inner surface 165 of the bottom plate of the reinforcing plate 106 (FIG. 9)
(See FIG. 10).
Overlaid. At this time, screw holes 162i and 173i
Matches. The FPC cable 101 is bent so that the surface becomes convex between CC ′ shown in FIGS. 6 and 7, and is bent substantially at right angles so that the surface becomes concave between DD ′. The bottom plate outer surface 166 of the reinforcing plate 105 and the thick plate back surface 175 of the reinforcing plate 107 (see FIG. 10) form one plane.

Next, the connector mounting portion 116 is folded back toward the reinforcing plate 107 between EE ′ of the FPC cable 101 shown in FIGS. 6 and 7, and the engaging hole 116m of the connector mounting portion 116 is engaged with the engaging projection 173m. The back surface (to which the reinforcing film 104 is bonded) of the connector mounting portion 116 is superimposed on the flat surface formed by the bottom plate outer surface 166 and the thick plate back surface 175. At this time, the positions of the screw hole 116i and the screw holes 162i and 173i match, and the screw hole 116j and the screw holes 115j and
The positions of 1j coincide. As described above, the folded FPC cable assembly 10 shown in FIG. 5 is manufactured.

The process for incorporating the folded FPC cable assembly 10 shown in FIG. 5 into a disk drive will be described below. The first mounting portion 111 and the routing portion 114 of the FPC cable 101 are connected to the mounting bracket 153 of the reinforcing plate 105 by screws passing through the screw holes 114h and 153h.
7 (see FIG. 4), and is mounted on the side surface of the carriage 3. Further, the head wire 42 is soldered to the head wire pad electrode 122, and the lead of the voice coil 51 is soldered to the voice coil pad electrode 123. The head wire 42 is clamped in a groove 156 (see FIG. 8) provided in the wire bracket 152 of the reinforcing plate 105 and guided to the head wire pad electrode 122.

Next, the coil arm 33 of the carriage 3 to which one end of the FPC cable assembly 10 (the first mounting portion 111 and the like) is mounted is connected to the permanent magnet bodies 53 a and 5
3b, the intermediate portion 31 of the carriage 3 is pivotally mounted on the pivot shaft 35 via the bushing 34, and the yoke 52 is screwed to the base 61.

The second mounting portion 113, the electric component mounting portion 115, and the connector mounting portion 116 of the FPC cable 101 have screws passed through screw holes 173i, 162i, 116i and screws passed through screw holes 115j, 171j. Is screwed to the base 61. At this time, the connector 131 is inserted into the connector insertion port 64 with the seal frame 65 mounted on the periphery thereof. The spring pins 131a of the connector 131 abut against and connect to the connector connection pattern 71 formed on the circuit board 7.

As described above, the first mounting portion 111 and the reinforcing plate 105, and the second mounting portion 113 and the reinforcing plate 106
Are positioned and bonded with high precision, and the occurrence of rotational displacement of the flexible portion 12 with respect to the reinforcing plate 105 and the reinforcing plate 106 in the manufacturing process of the FPC cable assembly 10 can be suppressed. FPC cable assembly 1 incorporated
No. 0 can secure a clearance between the bottom surface of the base 61 of the enclosure case 6 and the top cover 62.

As described above, according to the FPC cable assembly 10 of the present invention, the reinforcing films 102 and 103 are bonded to the first mounting portion 111 and the second mounting portion 113 in advance, and the reinforcing plate is attached to the bonded portion. 105, 106
Are attached to each other, so that the first mounting portion 11
It is possible to improve the bonding accuracy of the first and the reinforcing plate 105 and the second mounting portion 113 and the reinforcing plate 106, and to suppress the rotational displacement of the flexible portion 112. Further, since the FPC cable assembly 10 can be manufactured only by changing the shape of the reinforcing film pattern in the conventional manufacturing process of the FPC cable assembly, the cost is increased despite the addition of the reinforcing films 102 and 103. Absent. This FPC cable assembly 1
By constructing the disk drive device using 0, a clearance between the FPC cable assembly and the enclosure case 6 can be ensured.

In the above embodiment, the FP
Although polyimide was used as the material of the base film of the C cable and polyetherimide was used as the material of the reinforcing film, the materials of the base film and the reinforcing film are arbitrary. The base film and the reinforcing film of the FPC cable may be formed from the same material, and the reinforcing plate may be formed from the same material as the base film and the reinforcing film.

In the above embodiment, the FP
Although the C cable and the reinforcing plate are laminated with a reinforcing film interposed therebetween, the FPC cable is connected to the reinforcing film and the reinforcing plate in the second mounting portion 113 or the like where the pad electrode is not formed on the surface. A laminated structure may be used in which the layers are bonded together.

Further, in the above embodiment, F
Although the structure in which the PC cable, the reinforcing film, and the reinforcing plate are laminated one by one is adopted, the number of layers and the order of lamination are arbitrary. For example, a two-layer FPC cable and a two-layer reinforcing film may be bonded, and reinforcing plates may be bonded to both sides of the bonded portion.

The shapes of the FPC cable, the reinforcing film, and the reinforcing plate are not limited to the shapes shown in FIGS.

[0058]

As described above, according to the flexible cable assembly and the method of manufacturing the same of the present invention, a reinforcing film is bonded to a flexible cable in advance, and a reinforcing plate is further bonded to the bonded portion. It is possible to improve the bonding accuracy of the flexible cable and the reinforcing plate without increasing the cost, and it is possible to suppress the rotational displacement of the flexible cable with respect to the reinforcing plate.

Further, by constituting a disk drive device using the flexible cable assembly of the present invention, there is an effect that a clearance between the flexible cable assembly and the enclosure case can be secured.

[Brief description of the drawings]

FIG. 1 is a partially exploded view showing a configuration of a disk drive device according to an embodiment of the present invention.

FIG. 2 is a partially exploded view showing a configuration of the disk drive device according to the embodiment of the present invention.

FIG. 3 is a partially exploded view showing a configuration of the disk drive device according to the embodiment of the present invention;

FIG. 4 is a diagram showing a structure around a carriage in the disk drive device according to the embodiment of the present invention.

FIG. 5 is a view showing a bent structure of an FPC cable assembly in the disk drive device according to the embodiment of the present invention.

FIG. 6 is an exploded structural view of an FPC cable assembly in the disk drive device according to the embodiment of the present invention.

FIG. 7 is a development view showing a position where a reinforcing film and a reinforcing plate are attached to the FPC cable in the FPC cable assembly of the disk drive device according to the embodiment of the present invention.

FIG. 8 is a diagram showing a structure of a reinforcing plate bonded to a first attachment portion of the FPC cable in the FPC cable assembly of the disk drive device according to the embodiment of the present invention.

FIG. 9 is a diagram showing a structure of a reinforcing plate bonded to a second mounting portion of the FPC cable in the FPC cable assembly of the disk drive device according to the embodiment of the present invention.

FIG. 10 is a diagram showing a structure of a reinforcing plate bonded to an electric component mounting portion of the FPC cable in the FPC cable assembly of the disk drive device according to the embodiment of the present invention.

FIG. 11 is a diagram illustrating an example of a manufacturing process of the FPC cable assembly in the disk drive device of the embodiment of the present invention (part 1).

FIG. 12 is a view illustrating an example of a manufacturing process of the FPC cable assembly in the disk drive device of the embodiment of the present invention (part 2).

FIG. 13 is a view showing an example of the manufacturing process of the FPC cable assembly in the disk drive device of the embodiment of the present invention (part 3).

FIG. 14 is a view illustrating an example of a process of manufacturing the FPC cable assembly in the disk drive device of the embodiment of the present invention (part 4).

FIG. 15 is a view showing an example of the manufacturing process of the FPC cable assembly in the disk drive device of the embodiment of the present invention (part 5).

FIG. 16 is a view showing an example of the manufacturing process of the FPC cable assembly in the disk drive device of the embodiment of the present invention (part 6).

FIG. 17 illustrates a conventional FPC cable assembly.
FIG. 4 is a development view showing a position where a reinforcing film and a reinforcing plate are attached to a PC cable.

FIG. 18 is a view showing a manufacturing process of a conventional FPC cable assembly (part 1).

FIG. 19 is a diagram illustrating a manufacturing process of the conventional FPC cable assembly (part 2).

[Explanation of symbols]

1 disk, 3 carriage, 4 head slider, 6 enclosure case, 7 circuit board,
10 FPC cable assembly, 101 FPC cable, 102, 103 Reinforcement film, 105, 1
06 Reinforcement plate, 111 First mounting part, 112 Flexible part, 113 Second mounting part, 111a, 111
b, 111c, 113d, 113e, 115f, 115
g, 151a, 151b, 151c, 161d, 161
e, 173f, 172g Positioning hole, 201 FP
C cable base film material, 312 positioning pin.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroki Kitahori 1 Kirihara-cho, Fujisawa-shi, Kanagawa Prefecture IBM Japan, Ltd. Fujisawa Office (72) Inventor Shinichi Matsuzaki 1 Kirihara-cho, Fujisawa-shi, Kanagawa Japan Eye・ BM Corporation Fujisawa Office

Claims (10)

[Claims] 1. A flexible cable, comprising: a reinforcing film for reinforcing the flexible cable; and a reinforcing plate for reinforcing the flexible cable, wherein the reinforcing plate is provided at a bonding portion of the flexible cable and the reinforcing film. Wherein the flexible cable assembly is bonded. 2. The flexible cable according to claim 1, wherein a first mounting portion and a second mounting portion are integrally formed on both ends of a strip-shaped flexible portion, respectively, and the reinforcing film and the reinforcing plate are formed of first and second mounting portions. 2. The flexible cable assembly according to claim 1, wherein the flexible cable assembly is bonded to each of the mounting portion and the second mounting portion. 3. 3. The flexible cable assembly according to claim 1, wherein the reinforcing film has a thickness of three to five times a thickness of the flexible cable. 4. The flexible cable assembly according to claim 1, wherein each of the base film and the reinforcing film of the flexible cable is a polyimide film or a polyetherimide film. 5. The flexible cable assembly according to claim 1, wherein the base film and the reinforcing film of the flexible cable are made of the same material. 6. A method of manufacturing a flexible cable assembly, comprising: a step of bonding a reinforcing film to a flexible cable; and a step of bonding a reinforcing plate to a bonding portion between the flexible cable and the reinforcing film. 7. The method according to claim 7, further comprising the step of providing a positioning hole in a bonding portion between the flexible cable and the reinforcing film, wherein the step of bonding the reinforcing plate includes the positioning hole in the bonding portion and the positioning hole provided in the reinforcing plate. 7. The method for manufacturing a flexible cable assembly according to claim 6, wherein a reinforcing plate is positioned at the bonding portion such that the following is satisfied. 8. The bonding step of bonding a reinforcing plate includes inserting a positioning pin provided on a flat portion into a positioning hole of the bonding portion and a positioning hole of the reinforcing plate, thereby forming a reinforcing plate on the bonding portion. The method for manufacturing a flexible cable assembly according to claim 7, wherein the flexible cable assembly is positioned. 9. A disk recording medium; a carriage supporting a transducer head for writing information on or reading information from the disk recording medium; a circuit board for transmitting and receiving signals to and from the carriage; A storage medium and the carriage are housed therein, and an enclosure case in which the circuit board is mounted; and a flexible cable assembly connecting the carriage and the circuit board. The flexible cable assembly includes: a flexible cable; A reinforcing film for reinforcing the flexible cable; and a reinforcing plate for reinforcing the flexible cable, wherein the reinforcing plate is bonded to a bonding portion of the flexible cable and the reinforcing film. And de Disk drive device. 10. The flexible cable is formed by integrally forming a first mounting portion and a second mounting portion at both ends of a strip-shaped flexible portion, respectively, wherein the reinforcing film and the reinforcing plate are formed of first and second reinforcing portions. And a reinforcing plate bonded to the first mounting portion is mounted on the carriage, and a reinforcing plate bonded to the second mounting portion is The disk drive device according to claim 9, wherein the disk drive device is fixed to the enclosure case.