JPH05266451A - Magnetic head device - Google Patents

Abstract

PURPOSE:To prevent the disconnection or the shortcircuit of a signal line in a connection part (soldered part) between the signal line pulled out from a head element and an FPC connected to a recording and reproducing circuit body in a magnetic head device for a magnetic disk. CONSTITUTION:The signal line 16 us covered almost with a protection tube 4 between the head element and the connection part 17, and either the protection tube 4 and the FPC 6 are arranged along (FPC 6 is arranged through a reinforcing plate 7 attached to the side surface of a guide arm 5) the side surface of the guide arm 5. Since a step is provided between both attaching surfaces so that the side surface of the arm 5 attaching the protection tube 4 is higher than the side surface of the arm 5 attaching the FPC 6 or the reinforcing plate 7 as a feature, no tension occurs in the signal line 16 and the signal line is not rubbed by the corner of the reinforcing plate and the disconnection or the shortcircuit is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head device used in a magnetic disk device or the like, and more particularly to a magnetic head device which prevents disconnection or short circuit of a signal line for transmitting a recording / reproducing signal to a magnetic head.

[0002]

2. Description of the Related Art Conventionally, in a magnetic head device used for a magnetic disk device, a signal line and a protective tube for transmitting a recording / reproducing signal to a magnetic head (magnetic head element) and an FPC (flexible print circuit) relaying to a circuit of a main body. ) And the arrangement of the reinforcing plate, see, for example, Japanese Patent Laid-Open No.
As described in JP-A-3-55717, there is no step between the side surface of the guide arm (protective tube mounting surface) on which the signal line and the protective tube are arranged and the mounting surface of the FPC and the reinforcing plate (both mounting surfaces). Are on the same plane)
It has been known.

[0003]

FIGS. 3 and 4 show the arrangement of the signal line, the protective tube, the FPC, and the reinforcing plate in the above-described conventional magnetic head device. 4 is a protective tube, 5 is a guide arm, 6 is an FPC, 7 is a reinforcing plate,
Reference numeral 16 is a signal line, 17 is a soldering portion for connecting the signal line to the FPC, and 18 is a guide arm. If there is no step between the side surface of the guide arm 18 for arranging the signal line 16 and the protective tube 4 (protective tube mounting surface) and the mounting surface of the FPC 6 and the reinforcing plate 7 (on the same plane), the protective tube 4 is FP.
When it reaches C6, the protection tube 4 rides on the FPC 6 and the reinforcing plate 7 and is warped, so that the signal line 16 is always in a state of being applied with a pulling force and may be disconnected (Fig. 3). In addition, the protective tube 4 is F
If the signal line 16 does not reach the PC 6, the exposed portion of the signal line 16 may come into contact with the corner of the FPC 6 or the reinforcing plate 7 and be broken (FIG. 4). Such a problem occurs not only when the magnetic head device is manufactured but also when the signal line is shaken by the wind when the magnetic head device is used.

As the capacity of magnetic disk devices has been increased, high density packaging has been required. Along with this, miniaturization and simplification (simplification) of each component has progressed, and a small magnetic head has come to be used. When a small magnetic head is used, the load of the signal line has a large influence on the levitation of the magnetic head. Therefore, it is necessary to consider the levitation of the magnetic head sufficiently by using a signal line as thin as possible. As described above, when the capacity of the magnetic disk device is increased and thin signal lines are used, it is unavoidable that the structure of the prior art does not sufficiently consider the disconnection of the signal lines.

As described above, in the above-mentioned conventional technique, there is no step between the side surface of the guide arm for arranging the signal line and the protection tube and the mounting surface of the FPC and the reinforcing plate, and the space between the signal line and the protection tube, and the FPC and the reinforcing plate is provided. Since the arrangement is not taken into consideration, when the diameter of the signal line becomes smaller, the disconnection or short circuit of the signal line in the portion exposed from the protective tube is likely to occur. For example, if the protective tube does not reach the FPC or the reinforcing plate, it may contact the corner of the FPC or the reinforcing plate to break the wire, or even if the protective tube reaches the FPC or the reinforcing plate, the protective tube may not reach the FPC.
Or when riding on the reinforcing plate, the protective tube warps and the signal line is constantly pulled,
It causes a disconnection.

Therefore, an object of the present invention is to overcome the above-mentioned problems of the prior art, and whether the protective tube has reached the FPC or the reinforcing plate, whether it has arrived, or not using the protective tube. By making it possible to properly arrange the signal line, FPC and its reinforcing plate,
This is to prevent disconnection of the exposed portion of the signal line.

[0007]

In order to achieve the above object, the present invention provides a signal line that is pulled out from a magnetic head and mounted on the side surface of a guide arm, and a signal line mounted on the surface of the guide arm. FP for relay connection of the
In the magnetic head device having C and C, a step is formed between the signal line mounting surface and the FPC mounting surface such that the surface of the guide arm on which the signal line is mounted is convex with respect to the surface on which the FPC is mounted. Is provided.

[0008]

The operation based on the above configuration will be described. According to the present invention, in the magnetic head device, between the FPC and the mounting surface of the reinforcing plate, the side surface (signal line mounting surface) of the guide arm on which the signal line or the protective tube for housing the signal line is mounted is convex. Since the step is provided at the position, if the protective tube does not reach the FPC or the reinforcing plate, the signal line can be wired without coming into contact with the corners of the FPC or the reinforcing plate and rubbing, so there is no fear of disconnection. If the protective tube reaches the FPC or the reinforcing plate, the protective tube can be placed on the FPC without warping.
No pulling force is applied to the signal line, and there is no concern about disconnection. Further, even in the case of a bare signal line having no protective tube, the signal line and the FPC can be arranged so as to be substantially flush with each other, so that there is no risk of disconnection at the connection portion between the signal line and the FPC.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a magnetic head device in which the present invention is applied to a hard magnetic disk device will be described below with reference to FIGS.

FIGS. 1, 2 and 5 are a series of views showing a typical embodiment of the present invention, FIG. 1 being a plan view thereof and FIG.
1 is a detailed view of a portion A of FIG. 1, and FIG. 5 is a detailed view of a carriage near the soldering portion of FIG. In these figures, 1 is a magnetic head (head element), 2 is a magnetic head support spring, 3 is a support spring reinforcing plate, 4 is a circular protective tube, 5 is a guide arm made of a light metal such as Mg alloy or aluminum alloy, 6 Is an FPC, 7 is a reinforcing plate made of aluminum or synthetic resin for preventing the FPC from bending, 8 is a carriage body, 9 is a bearing, 10 is an FPC fixing plate, and 11a and 11b are FPCs.
Fixing screw, 12 bobbin, 13 VCM (voice coil motor) coil, 14 magnetic head assembly, 15 carriage assembly, 16 signal line, 17 soldering part, 19
Is a rib (rail-shaped portion), 20 is a mounting surface for the FPC and the reinforcing plate, 23 is an IC (integrated circuit) mounted on the FPC 6, and 24 is a surface for arranging the signal line and the protection tube. The magnetic head support spring 2 is at the support spring reinforcing plate,
It is attached to the guide arm 5 by screwing, bonding, or swetching (fixed by plastic deformation of metal). The protection tube 4 covers most of the signal line 16, is made of an elastic synthetic resin such as Teflon, and is arranged along each side surface of the support spring 2 and the guide arm 5. It is fixed with or with an adhesive. The guide arm 5 has a substantially uniform thickness and its thickness (width in the right and left in FIG. 5) is approximately 2
~ 2.5 mm, the outer diameter of the protective tube is approximately 0.4 to 0.
5 mmφ, the wire diameter of the signal line 16 (insulated) is, for example, 20 μmφ to 50 μmφ, the thickness of the reinforcing plate 7 is approximately 0.3 to 0.5 mm, and the thickness of the FPC 6 is approximately 0.2 mm.
~ 0.3 mm.

The signal line 16 extending from the magnetic head 1 passes through the side surface of the magnetic head support spring 2 and is arranged on the side surface of the guide arm 5, and is soldered 17 near the end of the FPC 6.
Has been done. In order to fix the protection tube 4 to the side surface of the guide arm 5 (FIG. 1), a paper tape / resin tape or metal foil (not shown) with an adhesive or an adhesive may be used. The signal line 16 is covered with the protective tube in most areas, but is exposed near the end of the FPC 6 (FIGS. 1 and 2). A rib 19 for positioning or fixing the protection tube 4 is provided on the side surface of the guide arm 5 on which the signal line 16 and the protection tube 4 are arranged (FIG. 5). A feature of this embodiment is that between the surface 24 on which the protective tube 4 of the guide arm 5 is arranged and the mounting surface 20 of the FPC 6 and the reinforcing plate 7 of the carriage block 8, the surface 24 on which the protective tube 4 is arranged is a surface. There is a step having a dimension a which is convex with respect to 20 (higher on the surface 24 side) (FIG. 5). The dimension a is preferably at least a value obtained by subtracting the radius of the protective tube 4 from the sum of the thicknesses of the FPC 6 and the reinforcing plate 7.

When the signal line 16, the protective tube 4, the FPC 6 and the reinforcing plate 7 are arranged as in this embodiment, the signal line 1
6 is always arranged on the upper surface of the FPC 6, and even if the tip of the protective tube 4 (the outlet of the signal line) does not reach the FPC 6, it does not come into contact with the corners of the FPC 6 and the reinforcing plate 7 and there is no fear of disconnection. ..

Further, if the dimension a is equal to or more than the sum of the thicknesses of the FPC 6 and the reinforcing plate 7, the tip of the protective tube 4 is FPC 6.
Or even if it reaches the reinforcing plate 7, the protective tube 4
The tip of can be arranged so as to be mounted on the FPC 6 without warping, and there is no concern that the signal line 16 will be pulled due to pulling force.

FIG. 6 is a detailed view showing the configuration of an embodiment according to the present invention when the protective tube 4 reaches the FPC 6. By providing a step between the side surface of the guide arm 5 on which the protective tube 4 is arranged and the surface on which the FPC 6 and the reinforcing plate 7 are mounted, the signal line 16 and the protective tube 4 are provided.
It can be arranged on the FPC 6 without warping. At this time, it is preferable that the step between the side surface of the guide arm 5 on which the protection tube 4 is arranged and the surface on which the FPC 6 and the reinforcing plate 7 are mounted is at least equal to or larger than the sum of the thicknesses of the FPC 6 and the reinforcing plate 7.

FIG. 7 shows an embodiment of the present invention in the case where there is no rib used for positioning or fixing the signal line 16 and the protective tube 4 on the side surface of the guide arm 21. In this case, the signal line 16 and the protective tube 4 are connected to the guide arm 21.
In order to fix it on the side surface, a paper or resin tape 22 with an adhesive may be used as shown in FIG. 7, or an adhesive may be used.

FIGS. 8 and 9 show an embodiment of the present invention in which the FPC 6 is extended to the protective tube 4 side of the reinforcing plate 7. By extending the FPC 6 to the protective tube 4 side with respect to the reinforcing plate 7, the signal line 16 is always arranged on the surface of the FPC 6 and the corner of the reinforcing plate 7 which is considered to be the first cause of disconnection and short circuit of the signal line 16. Contact can be reliably prevented.

FIG. 10 shows an embodiment of the present invention in the case where the recording / reproducing signal is transmitted to / from the magnetic head 1 by the narrow FPC 26 without depending on the signal line 16. Width FP
Although C26 is provided for each magnetic head, it has a wide width F
The PC 27 is a collection of input / output lines from each magnetic head. Narrow width for transmission of recording / reproducing signals with the magnetic head 1
Even in the case of using the PC 26, by providing a step between the side surface of the guide arm 25 on which the narrow FPC 26 is arranged and the mounting surface of the wide FPC 27 and the reinforcing plate 7, the narrow FPC 26
Since it is possible to minimize the bending that occurs in the soldering part 28, it is possible to prevent the soldering part 28 from peeling off without giving an extra force to the soldering part 28. At this time, the side surface of the guide arm 25 on which the narrow FPC 26 is arranged and the FPC
It is desirable that the dimension of the step between the mounting surface of the reinforcing plate 7 and the mounting surface of the reinforcing plate 7 is approximately equal to the sum of the thicknesses of the FPC 27 and the reinforcing plate 7. The width of the narrow FPC 26 is equal to or narrower than the width of the side surface of the guide arm 25, and is, for example, about 2.0 mm to 2.5 mm. On the other hand, wide F
The width of the PC 27 is, for example, 45 to 50 mm. The narrow width FPC 26 directly connects the magnetic head 1 and the FPC 27, and there is no intermediate signal line. Also, the narrow width F
The PC 26 is arranged on the side surface of the guide arm 25 via an adhesive or an adhesive. The signal line according to the present invention includes the FPC 26 having the narrow ridge.

11 and 12 show the side surfaces of the guide arms 29 and 30 for arranging the signal line 16 and the protective tube 4, and the FPC.
6 and the mounting surface of the reinforcing plate 7 are 180 ° or less (see FIG.
1) or 180 ° or more (FIG. 12). In this case, in order to obtain the effect of the present invention, the center position of the outlet of the signal line 16 from the protection tube 4 (the tip surface of the protection tube 4) is approximately equal to the height of the surface of the FPC 6, or the surface of the FPC 6 It is desirable to be at a higher position.

In the above embodiment, the signal line is covered with the protective tube, but it can be applied without the protective tube.

The guide arm 5 may be separate for each head to be stacked, but it is also applicable to one in which all the guide arms are integrally molded with the carriage block 8 in a comb shape. It

[0021]

As described above in detail, according to the present invention, in the magnetic head device, the surface of the guide arm on which the signal line or the protective tube for the signal line is attached is the FPC.
Since the step is formed so as to be convex with respect to the surface on which the reinforcing plate is attached, the wiring of the signal line of the magnetic head and the FPC
There is an effect that a disconnection or a short circuit can be prevented in the vicinity of the connection with.

[Brief description of drawings]

FIG. 1 is a plan view of a head / carriage assembly of an exemplary embodiment of the present invention.

FIG. 2 is a detailed view of part A when the protective tube does not reach the FPC in FIG.

FIG. 3 is a detailed view of the vicinity of the signal line soldering portion when the protective tube reaches the FPC in the conventional technique.

FIG. 4 is a detailed view of the vicinity of the signal line soldering portion when the protective tube does not reach the FPC in the conventional technique.

FIG. 5 is a detailed view of a side surface of a guide arm for arranging a protective tube and a mounting surface of an FPC and a reinforcing plate in the vicinity of a step in the carriage according to the embodiment of the present invention.

FIG. 6 is a configuration diagram of an embodiment when the protective tube of the present invention reaches the FPC.

FIG. 7 is a configuration diagram of an embodiment of the present invention in which there is no rib for positioning or fixing the signal line and the protective tube.

FIG. 8 is a configuration diagram of an embodiment in which the FPC of the present invention is extended to the protective tube side with respect to the reinforcing plate.

9 is a side view of FIG.

FIG. 10 is an example of a case where a signal is transmitted to the magnetic head of the present invention by a narrow width FPC.

FIG. 11 is an embodiment in which there is an angle between the side surface of the guide arm and the FPC mounting surface of the present invention.

FIG. 12 is an example of the case where there is an angle between the side surface of the guide arm and the FPC mounting surface of the present invention.

[Explanation of symbols]

 1 Magnetic Head 2 Magnetic Head Support Spring 3 Support Spring Reinforcement Plate 4 Protective Tube 5, 18, 21, 21, 25, 29, 30 Guide Arm 6,27 FPC 7 Reinforcement Plate 8 Carriage Body 9 Bearing 10 FPC Fixing Plate 11a, 11b FPC Fixing Screw 12 Bobbin 13 VCM coil 14 Magnetic head assembly 15 Carriage assembly 16 Signal line 17, 28 Soldering part 19 Rib 20 FPC and reinforcing plate mounting surface 22 Adhesive tape 23 IC 24 Arrange signal line and protective tube Face 26 Narrow FPC

Claims (9)

[Claims] 1. A signal line drawn from a magnetic head and mounted on a side surface of a guide arm, and a signal line F mounted on a side surface of the guide arm and relay-connecting the signal line to a main circuit.
A magnetic head device having a PC, wherein a step is provided so that a surface of the guide arm on which the signal line is mounted is convex with respect to a surface of the FPC. 2. The magnetic head device according to claim 1, wherein the signal line is attached to a side surface of the guide arm by a protective tube that protects the signal line. 3. The magnetic head device according to claim 1, wherein the FPC is attached to a side surface of the guide arm via a reinforcing plate. 4. The magnetic head device according to claim 2, wherein one or more ribs for positioning or fixing the signal line and the protective tube are provided on the side surface of the guide arm. 5. The magnetic head device according to claim 3, wherein an angle is provided between a surface of the guide arm on which the signal line is mounted and a surface of the guide arm on which the FPC is mounted. 6. The step difference between the surface on which the signal wire is mounted and the surface on which the FPC is mounted on the side surface of the guide arm is at least FP.
4. The magnetic head device according to claim 3, wherein the size is equal to or larger than the sum of the thickness of C and the thickness of the reinforcing plate minus the radius of the protective tube. 7. The magnetic head device according to claim 3, wherein the average height of the signal line outlet from the protection tube is substantially equal to the height of the soldering surface of the FPC. 8. The magnetic head device according to claim 3, wherein the average height of the outlet of the signal line from the protection tube is higher than the soldering surface of the FPC. 9. The magnetic head device according to claim 1, wherein a carriage block is integral with the guide arm.