JP2003317217A - Magnetic head assembly and magnetic disk storage device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To regulate the vibration of a tail part which is a suspension extended part in a magnetic head assembly, and to secure a mechanical strength for the tail part. <P>SOLUTION: This magnetic head assembly is provided with a magnetic head 2 for recording/reproducing information on a recording medium, a suspension 4 for supporting the magnetic head, a tail part 10 which is a suspension extended part, wiring 9 formed on the suspension and the tail part, and an arm 5 to which the suspension is attached. Most of the wiring on the suspension and the tail part is covered with an insulating protective film and, in the partial section of the tail part, a thick structure 10a is formed on the plane of the tail part to increase the strength of the tail part. The thick structure includes a damping material. The projected part 5a of the arm 5 is disposed to guide the tail part in its longitudinal direction via the thick structure. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk storage device for magnetically recording or reproducing information, and more specifically, it is provided in a suspension for supporting a magnetic head in a magnetic head assembly and is connected to the magnetic head at one end. The present invention relates to the structure of the lead-out portion of the wiring connected to the main flexible printed wiring board (hereinafter referred to as FPC) at the other end.

[0002]

2. Description of the Related Art In a conventional magnetic disk storage device, an outline of a connecting portion between a wiring drawn from a magnetic head assembly and a main FPC will be described with reference to the configuration shown in FIG. The wiring 9 having one end connected to the magnetic head 2 for magnetically recording or reproducing information is connected to the main FPC 8 at the other end. Transmission of a signal for recording or reproducing information between the outside of the magnetic disk storage device and the magnetic head 2 is performed by
It is performed via the main FPC 8 and the wiring 9. In FIG.
Reference numeral 4 is a suspension, 5 is an arm, and the suspension 4 is attached to the arm 5.

In FIG. 8, for example, a gold-plated copper wire having a diameter of about 30 μm obtained by plating a copper wire with gold is used as the wiring 9, and the wiring 9 and the main FPC 8 are connected by using solder or the like. In the configuration shown in the figure, there are four wires 9 connected to the magnetic head 2 composed of a recording head and a reproducing head.
In the illustrated example, four gold-plated copper wires are bundled from the magnetic head 2 and wired, and the four bundled at the connection portion with the FPC are expanded and connected to the FPC connection portion.

FIG. 9 shows TSA (reference “TSA Suspension Application Guide”, HTI, published by Hutchinson Technology Inc. (USA; HTI)).
It is a figure explaining the outline of the connection part of the wiring 9 and the main FPC8 on the tail part 10 (issued September 10, 1999). The wiring 9 whose one end is connected to the magnetic head 2 faces the main FPC 8 at the end of the tail portion 10 which is bent substantially vertically. By using gold plating on the surfaces of the wiring 9 and the main FPC 8, connection by ultrasonic bonding is possible. Since the wiring is formed on the tail portion 10, the tail portion 10 can be used for correction and alignment. That is, since the wiring is formed on the tail portion 10 so that the pitch of the connecting end portions arranged in the main FPC 8 in the vertical row and the pitch of the connecting end portions of the wirings 9 face each other, the soldering is performed. At this time, it is not necessary to correct the wiring end portions as shown in FIG.

FIG. 10 schematically shows a connecting portion between the wiring 9 and the main FPC 8 disclosed in Japanese Patent Laid-Open No. 7-161116. The end of the wiring 9 provided at the end of the tail portion 10 and the main FPC 8 are connected by soldering or the like. Since the connecting portion between the wiring 9 and the main FPC 8 forms a row in the longitudinal direction of the tail portion 10, it is possible to increase the distance between the wirings in the adjacent connecting portions without increasing the height h of the connecting region, and use a jig or the like. Easy alignment. That is, for example, four connection end portions of the wiring in the tail portion 10 of FIG. 10 are arranged in a horizontal row in the drawing, and the main FP facing the wiring is arranged.
It can be connected to the C connection end.

Further, Japanese Laid-Open Patent Publication No. 10-116409 discloses a lead structure 10 for electrically connecting a head slider and an FPC, which structure is formed from a laminated material sheet 26. , This sheet 26
Is a metal base layer 28, a dielectric insulating layer 32 and a conductor layer 30.
And a tail portion 46 reaching the terminal pad section 42 forming a connection portion with the FPC. Further, the entire length of the tail portion 46 of the conductor layer 30 is lined with the tail section 65 of the metal base layer 28. The tail portion 46 with the conductor layer 30 extends out of the load beam 12 in the mounting area 14 and is electrically interconnected to the terminal pad section 42.

[0007]

However, in the prior art shown in FIG. 8, the size of the area that can be used for connecting each wiring and the height h of the connecting area of the four wirings 9 are such that they are connected by soldering or the like. Subject to workability restrictions. Also, the wiring 9
Is so weak that it can be cut with a tension of several 100 mN (several tens of gf), so it is difficult to correct it with a jig or the like for alignment. For example, overall height 12.7 mm (1/2 inch)
In a thin high-capacity magnetic disk storage device equipped with 8 to 10 magnetic head assemblies, four wires 9
It is necessary to suppress the height h of the connection area of 1 to about 1 mm or less. It is 0.25 mm per wire, and it is difficult in production to perform the connecting work in such a narrow area without correcting the wiring 9 with a jig or the like and aligning it.

Although the workability of assembling the magnetic disk storage device can be improved by using the known techniques of FIGS. 9 and 10, since the tail portion 10 is thicker and heavier than a gold-plated copper wire or the like, the magnetic disk Deflection and vibration occur due to wind and surrounding vibrations and impacts that accompany disk rotation when the storage device is operating. If the stress generated inside the tail portion 10 due to the deflection or vibration of the tail portion 10 exceeds a permissible value determined by the tensile strength or the like, the tail portion 10 is destroyed and the magnetic head 2
Since the path for electrically exchanging information with the outside of the magnetic disk storage device is cut off, there is a serious obstacle that information cannot be recorded or reproduced.

Even if the stress is below the allowable value, the tail portion 10 may vibrate and collide with the arm 5 or be rubbed. If the vibration is large,
When bumped or rubbed, the surface of either or both of the tail portion 10 and the arm 5 is scraped, and shavings are generated. If the shavings fall on the magnetic disk, the surface of the magnetic disk may be damaged. Since information is magnetically recorded on the magnetic disk, if the surface is scratched, the recorded information is destroyed, which is a serious obstacle.

Further, the suspension 4 supporting the tail portion 10 is small even if the tail portion 10 vibrates little and does not generate shavings by colliding with the arm 5 or rubbing.
Also, stress is generated in the main FPC 8 and the arm 5 supporting them is bent. In a large-capacity magnetic disk storage device that stores information of 20 gigabytes or more per disk having a diameter of 3 inches (1 inch is 25.4 mm), the magnetic head 2 is positioned on the magnetic disk with a high accuracy of 1 μm or less. It is necessary to align them, and even if the deflection of the arm 5 is minute, the alignment of the magnetic head 2 may be difficult. If the magnetic head 2 cannot be aligned with high accuracy, information cannot be recorded in a minute portion on the magnetic disk, or the information recorded in the minute portion cannot be reproduced. Therefore, a large-capacity magnetic disk storage device. Can not be realized.

If the tail portion 10 is fixed to the arm 5 with an adhesive, the deflection of the tail portion 10 due to wind, vibration, impact, etc. can be reduced, and the tail portion is broken, shavings are generated, and the arm 5 is deflected. It is possible to prevent problems caused by. However, when replacing a defective magnetic head assembly in a magnetic disk storage device with a non-defective product, it is necessary to remove the adhesive, which makes assembly work difficult. If other parts assembled together with the defective magnetic head assembly are also defective, it is not necessary to remove the adhesive, but many components are discarded as defective, and the manufacturing cost increases.

Further, Japanese Laid-Open Patent Publication No. 10-116409 discloses a laminated structure of a tail portion (extension portion of the suspension) electrically connected to the FPC. No point of view and measures against the accompanying decrease in strength are disclosed.

It is an object of the present invention to provide a highly reliable magnetic head assembly and a magnetic disk storage device using the same in a thin and large capacity magnetic disk storage device without impairing the ease of assembly work. is there.

[0014]

To solve the above problems, the present invention mainly adopts the following configurations. A magnetic head for recording or reproducing information on a recording medium,
A magnetic head assembly comprising: a suspension supporting the magnetic head; a tail portion extending from the suspension; wiring formed on the suspension and the tail portion; and an arm to which the suspension is attached. The suspension and most of the wiring on the tail portion are formed so as to be covered with an insulating protective film, and a thickness structure for enhancing the strength of the tail portion on the plane of the tail portion in a part of the tail portion. A magnetic head assembly in which a magnetic field is formed.

The thickness structure is a magnetic head assembly including a damping material.

A magnetic head assembly provided with a protruding portion of the arm for guiding the tail portion in its longitudinal direction with the thickness structure interposed.

[0017]

DETAILED DESCRIPTION OF THE INVENTION A magnetic head assembly according to an embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective view showing the overall configuration of a magnetic disk storage device using a magnetic head assembly according to an embodiment of the present invention. Main parts such as the magnetic disk 1 and the magnetic head 2 are covered with a base 3 and a cover not shown in FIG. The one or more magnetic disks 1 are arranged so as to maintain a gap between the adjacent magnetic disks 1 and between the base 3 and the cover, and via a spindle motor (not shown). Attached to the base 3.

The magnetic head 2 is supported at one end of a suspension 4 so as to face the magnetic disk 1. The suspension 4 is attached to an arm 5 at an end opposite to the magnetic head 2, and the arm 5 is opposite to the suspension 4. Carriage 6 formed integrally with arm 5 or separately at the end of
It is fixed to. The carriage 6 is attached to the base 3 via a structure rotatable about the axis B, and can be rotated by a voice coil motor (VCM) 7 installed on the opposite side of the arm 5 of the carriage 6.

The magnetic disk 1 can be rotated by a spindle motor about an axis A perpendicular to the disk surface and passing through the center of the disk 1, and the magnetic head 2 is substantially parallel to the axis A.
The magnetic head 2 can be positioned at a desired position on the magnetic disk 1 because it can be pivotally moved by the VCM 7 around.

On the suspension 4, a wiring 9 is provided which is connected to the magnetic head 2 at one end and to the main FPC 8 at the other end, and the main FPC 8 is electrically connected at the end opposite to the wiring 9. It is connected to a processing circuit or the like for processing information.

With the configuration described above, the magnetic disk 1
At a desired position, the information electrically processed by the processing circuit is converted into a magnetic field by the magnetic head 2 through the main FPC 8 and the wiring 9, and magnetically recorded on the recording medium arranged on the magnetic disk 1. be able to. Further, the magnetic field from the recording medium is converted into a current or a voltage by the magnetic head 2 and electrically processed by the processing circuit connected via the wiring 9 and the main FPC 8, thereby recording on the magnetic disk 1. It is possible to reproduce the information that has been recorded.

FIG. 2 is a perspective view showing the overall structure of the magnetic head assembly according to the first embodiment of the present invention. 1
One or two suspensions 4 are fixed to the arm 5 of the book, and the wiring 9 (details of the wiring is omitted) provided on the suspension 4 is attached to the main FPC 8 at the end of the tail portion 10.
Are connected by soldering or ultrasonic bonding. Here, the tail portion 10 is an extended portion that extends the suspension 4 and has an integral structure with the suspension, but the present invention is not limited to this, and it may have an integral structure that is a separate member from the suspension. .

In this embodiment, the recording head is an induction type head, and the reproducing head is a magnetoresistive (MR) type head.
Since the recording / reproducing separated magnetic head 2 using the head is used, the wiring 9 is composed of four thin conductors for one magnetic head 2. However, the wiring 9 may be composed of a smaller or larger number of conductors depending on the configuration of the magnetic head 2 and the circuit used. The wiring 9 and the main FPC 8 are connected to each other at the end of the tail portion 10 for each pair of corresponding conductors.

FIG. 3 is a side view showing the detailed structure of the magnetic head assembly and the arm relating to the first embodiment of the present invention shown in FIG. The tail portion 10 is sandwiched between two pairs of projecting portions 5a provided on the left and right of the arm 5 at two locations, and has a structure that is thicker than the thickness in the vicinity thereof in the illustrated section 10a. That is, referring also to the enlarged view of the D-D cross section of FIG. 3, the tail portion 10 is disposed so as to be guided by the two pairs of protrusions 5 a (two vertical protrusions on the left and right in the figure) of the arm 5. At the same time, the tail portion 1 is formed at the location (section) of the protruding portion 5a.
0 has a structure in which the thickness in the vertical direction in the drawing is large.

Generally speaking, if the tail portion having no thickness structure as shown in the drawing is sandwiched between two pairs of vertical projections 5a and guided, deflection due to wind, vibration or impact can be reduced. However, the reaction force received when the tail portion 10 comes into contact with the protruding portion 5 a causes stress inside the tail portion 10. If this stress becomes larger than the strength of the tail portion 10, the tail portion 10 may be broken.

Therefore, in the embodiment of the present invention, the strength of the tail portion itself can be improved by increasing the thickness of the tail portion 10 in the illustrated section. Therefore,
As shown in the present embodiment, by providing the tail portion 10 with a portion (thickness portion) 10a having an increased thickness, the strength of the tail portion can be made larger than the internal stress due to the reaction force received from the protruding portion 5a described above. You can Here, the vertical projecting portion 5a has a function of sandwiching and guiding the tail portion, and a function of limiting vertical movement of the tail portion. Even if the thickness portion 10a extends over the entire tail portion 10, the same effect as when the thickness portion 10a is provided in a part of the tail portion is obtained. The design of the length and thickness of the thickness portion 10a is appropriately determined in consideration of the material of the tail portion, the material of the thickness structure, the manufacturing method, the arm size, and the like.

FIG. 4 is a plan view, a side view and an EE sectional view of the magnetic head assembly according to the first embodiment, and FIG. 5 is a CC sectional view of the tail portion shown in FIG. This E
As can be seen from the -E cross-sectional view, in the illustrated example, the four wirings 9 are arranged in the tail portion in parallel with each other on the horizontal plane. ing. By forming this thickness, the strength of the tail portion is improved.

Referring to a sectional view taken along line EE of FIG. 4, a tail portion 10 extending from the suspension 4 and a thickness portion 10a are formed.
The thickness structure constituting the above will be described.

The tail portion 10 holds the wiring 9 and the wiring 9.
It is composed of a part to be insulated and protected. The lowermost step and the upper layer thereof hold the wiring 9. In the present embodiment, the lowermost step is made of stainless steel or the like extending from the suspension,
An insulating material such as polyimide resin is formed on the upper layer. The wiring 9 is insulated and protected from the outside by an insulating material and an insulating protective film 9a. The insulating protection film 9a is used for most of the wiring 9 except for the connection with the magnetic head 2 and the main FPC 8.
Is formed so as to cover. By doing so, it is possible to prevent discharge from occurring between the wiring and the wiring even when it comes into contact with a charged jig or tool in the assembly process, and therefore an excessive current flows through the magnetic head 2 connected to the wiring 9. It is possible to prevent the magnetic head 2 from being destroyed.

The insulating protective film 9a can be formed by a method such as applying thermosetting polyimide and heating and curing, but since the thickness thereof is restricted by the design and manufacturing method of the suspension, a thin film of about several μm is required. It is practical. If the insulation protection film is thin, it may be damaged when it comes into contact with jigs and tools, and the wiring may be exposed at that location. It may be thicker than other parts.

The thickness structure may be formed by increasing the thickness of a part of the insulating protective film 9a, the insulating material, stainless steel or the like, or may be formed by applying and curing an adhesive or the like, which will be described later. It may be formed by adhering another member such as a damping material in which a viscoelastic body and stainless are laminated. The thickness portion 10a is formed by providing such a structure in a part of the tail portion 10.

Further, as shown in FIG. 5, the thickness portion 10a
Depending on the thickness, the rising direction may be either the disk side or the opposite side indicated by the arrow, and a plurality of parts 10a rising in different directions may be combined, and various structural examples are possible. In addition, the thickness portion 1 of the tail portion shown in FIG. 4 and FIG.
0a, as shown in FIG.
That is, the protruding portion 5a is formed.

Next, a magnetic head assembly according to a second embodiment of the present invention will be described below with reference to FIGS. 6 and 7. FIG. 6 is a plan view and a side view showing a magnetic head assembly according to a second embodiment of the present invention.
In the present embodiment, the damping member 11 having a damping effect due to viscoelasticity is attached to form the thickness portion 10a, and the thickness of the tail portion 10 is increased to increase the strength of the tail portion 10. It is possible to reduce the deflection of the tail portion 10 (vibration suppression function). In the configuration example of FIG. 6, the wiring of the tail portion 10 is formed on the surface opposite to the damping material 11 (the wiring is not shown), but the damping material may be attached onto the wiring. In this way, by attaching the damping material 11, it is possible to exert both functions of improving the strength of the tail portion by forming the thickness and suppressing the vibration of the tail portion.

FIG. 7 is a partial enlarged view of a side surface showing another configuration example of the tail portion in the second embodiment of the present invention. FIG. 7A shows an arm 5 in a magnetic disk storage device in which two magnetic head assemblies are incorporated in one arm 5.
And the arrangement of the tail portion 10 is shown. By arranging the thickness portions 10a of the damping material provided in the two facing tail portions 10 so as not to overlap each other, an increase in the total thickness of the pair of tail portions 10 is suppressed. That is, in the illustrated example, the thickness portions of the upper tail portion and the lower tail portion made of the damping material are configured so that the vertical direction thereof is different and the lateral direction thereof does not face each other.

FIG. 7B shows the arrangement of the tail portion 10 and the arm 5 provided with the thickness portion 10a so as to extend between the two pairs of protruding portions 5a. By forming the contact portions with the two pairs of protruding portions 5a and the thickness portions 10a therebetween, the bending strength of the tail portion 10 is increased, and the deflection due to wind, vibration or impact can be reduced. In the illustrated example shown in FIG. 7, the wiring of the upper and lower tail portions is arranged (not shown) on the surface on the side of the protruding portion 5a, but even if the wiring and the damping material are arranged on the same surface. good. Further, the configurations of (a) and (b) of FIG. 7 exemplify the installation location of the vibration damping material, but can naturally be applied to the installation location of the thickness portion shown in FIGS. 3 to 5. .

As described above, in the embodiment of the present invention, the material forming the thickness portion 10a provided in the tail portion 10 may be different from that of the tail portion 10, and the arm 5 and the protruding portion 5a and the tails facing each other may be used. It is possible to reduce the generation of shavings due to friction by using a tough material having excellent wear resistance such as polyimide on the surface in contact with the portion 10. Further, the same effect can be obtained by disposing a material having excellent wear resistance on the surfaces of the arms 5 contacting the thickness portion 10a and the contact portions of the tail portions 10 facing each other.

[0037]

According to the present invention, in the magnetic head assembly having the wiring connecting one end to the magnetic head and the other end to the main FPC, the workability of assembling the magnetic disk storage device is improved and the rotation of the magnetic disk is improved. The deflection of the tail part due to wind and surrounding vibrations / impacts caused by can be reduced.

Further, it is possible to prevent the tail portion from being broken, to prevent the generation of shavings due to the friction between the tail portion and the arm or the opposing magnetic head assembly, and to prevent obstacles due to the bending of the tail portion. A magnetic disk storage device can be realized.

[Brief description of drawings]

FIG. 1 is a perspective view showing an overall configuration of a magnetic disk storage device using a magnetic head assembly according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the overall configuration of a magnetic head assembly according to the first embodiment of the invention.

FIG. 3 is a side view showing a detailed structure of a magnetic head assembly and an arm according to the first embodiment.

FIG. 4 is a plan view, a side view, and an EE cross-sectional view of the magnetic head assembly according to the first embodiment.

5 is a sectional view taken along line CC of the tail portion shown in FIG.

6A and 6B are a side view and a plan view showing a magnetic head assembly according to a second embodiment of the invention.

FIG. 7 is a partial enlarged view of a side surface showing another configuration example of the tail portion according to the second embodiment of the present invention.

FIG. 8 is a diagram showing an example of a connection mode between a wiring end portion of a magnetic head assembly and a connection portion of a main FPC in a conventional technique.

FIG. 9 is a diagram showing another connection mode example of the wiring end portion of the magnetic head assembly and the connection portion of the main FPC in the conventional technique.

FIG. 10 is a diagram showing still another example of the connection mode between the wiring end portion of the magnetic head assembly and the connection portion of the main FPC in the related art.

[Explanation of symbols]

1 magnetic disk 2 magnetic head 3 base 4 suspension 5 arms 5a protrusion provided on the arm 6 carriage 7 Voice coil motor (VCM) 8 Main FPC 9 wiring 9a Insulation protection film 10 tail section 10a thickened portion provided on the tail portion 11 Damping material

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Haruhide Takahashi             2880 Kozu, Odawara City, Kanagawa Stock Association             Company Hitachi Ltd. Storage Division (72) Inventor Shigeo Terai             2880 Kozu, Odawara City, Kanagawa Stock Association             Company Hitachi Ltd. Storage Division (72) Inventor Naoki Maeda             2880 Kozu, Odawara City, Kanagawa Stock Association             Company Hitachi Ltd. Storage Division F-term (reference) 5D042 NA01 PA01 TA07                 5D059 AA01 BA01 CA01 CA21 CA23                       DA01 DA26 DA28 EA12                 5D068 AA01 BB01 CC12 EE01 EE17                       EE18 GG03

Claims (6)

[Claims] 1. A magnetic head for recording or reproducing information on a recording medium, a suspension for supporting the magnetic head, a tail portion extending the suspension, and a wiring formed on the suspension and the tail portion. A magnetic head assembly having an arm to which the suspension is attached, wherein most of the wiring on the suspension and the tail portion is formed so as to be covered with an insulating protective film, and a part of the tail portion is provided. A magnetic head assembly, wherein a thickness structure is formed on the plane of the tail portion in the section. 2. The magnetic head assembly according to claim 1, wherein the thickness structure includes a damping material. 3. The magnetic head assembly according to claim 1, further comprising a protruding portion of the arm for guiding the tail portion in the longitudinal direction with the thickness structure interposed therebetween. 4. The surface of the arm protrusion and / or the thickness structure according to claim 3,
A magnetic head assembly comprising a material having excellent wear resistance. 5. The arm protrusion according to claim 3, wherein two tail portions are interposed in the arm protrusion, and the respective thickness structures of the two tail portions are provided in opposite directions and do not overlap each other. A magnetic head assembly characterized by the above. 6. A magnetic disk storage device equipped with the magnetic head assembly according to claim 1. Description: