JPH09212988A - Magnetic head carriage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a magnetic head carriage whose configuration is simple and whose bending property and flexibility are sufficient by a method wherein a flexible printed-circuit board is constituted of a conductive part and of a solder plated part which is executed to its surface. SOLUTION: In a flexible printed-circuit board 10, an adhesive layer 15 is formed on a base film 14, and a conductive part 16 which is to constitute a lead wire is arranged and installed from its upper part. Thereby, the conductive part 16 is fixed and held by the adhesive layer 15. In addition, a solder layer 17 is formed, by a solder plating operation, on the exposed surface of the conductive part 16. When the flexible printed-circuit board 10 is built in a magnetic head carriage, the bending property and the flexibility of the magnetic head carriage are ensured sufficiently because the number of layers constituting the board 10 is small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head carriage for supporting a magnetic head for recording or reproducing information signals on a magnetic recording medium, and more particularly to a flexible printed circuit board as a lead wire drawn out from the magnetic head. It is about.

[0002]

2. Description of the Related Art Conventionally, a magnetic head carriage for a floppy disk is constructed, for example, as shown in FIG. That is, in FIG. 4, the magnetic head carriage 1 is
An elastic plate 4 is interposed between a carriage body 3 slidably supported along a guide 2 and a support portion 3a provided at one end of the carriage body 3 so as to be movable in the radial direction of the floppy disk. And a supporting arm 5 held so as to be swingable.

The supporting arm 5 is urged downward by a spring 6 as shown by an arrow A in the drawing, and a magnetic head, which will be described later, applies a predetermined pressure to the floppy disk. To be contacted.

Here, magnetic heads 7 and 8 are provided on the surfaces of the carriage body 3 and the support arm 5 which face each other at the tips thereof. The magnetic heads 7 and 8 are connected to a drive control circuit (not shown) via the flexible printed circuit board 9, so that the magnetic heads 7 and 8 record desired signals on the floppy disk. Alternatively, the reproduction can be performed.

The flexible printed circuit board 9 is shown in FIG.
As shown in FIG. 3, a head mounting portion 9a to which the terminals of the magnetic head 7 or 8 are to be soldered, a connecting portion 9b to be connected to, for example, a connector fixedly arranged in the magnetic head device, and these head mounting portions. It includes a lead portion 9c including a conductive portion that electrically connects between 9a and the connection portion 9b.

Here, the flexible printed circuit board 9 is
It is configured as shown in FIG. That is, the adhesive layer 9e is formed on the base film 9d, and the conductive portion 9f, which constitutes a lead wire, is disposed on the adhesive layer 9e. As a result, the conductive portion 9f can be fixedly held by the adhesive layer 9e. Further, an adhesive layer 9g is formed on the conductive portion 9f, and a cover film 9h for ensuring the insulating property and protecting the conductive portion 9f is covered thereover.

[0007]

By the way, in the above-described conventional magnetic head carriage 1, the carriage body 3 is slid along the guide 2 when the magnetic heads 7 and 8 access the floppy disk. Therefore, the flexible printed circuit board 9 is required to have flexibility so as not to hinder the movement of the carriage body 3 at the time of access.

In the flexible printed board 9, the conductive portion 9f is made of copper having a thickness of, for example, about 18 to 35 μm, and flexibility is required to avoid generation of cracks due to bending.

However, the above-mentioned flexible printed circuit board 9 has a five-layer structure as shown in FIG.
There is a problem that the whole becomes relatively thick, and particularly, the cover film 9h is formed of polyimide or the like having a thickness of, for example, about 25 μm, so that the flexibility and flexibility are deteriorated.

Further, since the flexible printed circuit board 9 has a multi-layer structure, there are problems that the number of steps is increased, the material cost and the manufacturing cost are increased, and the cost of the flexible printed circuit board 9 itself is increased.

In view of the above points, the present invention provides a magnetic head carriage having a flexible printed circuit board, which has sufficient flexibility and flexibility with a simple structure and can be reduced in cost. The purpose is to do.

[0012]

According to the present invention, there is provided a support arm swingably held by an elastic plate integrally insert-molded with a mounting portion of a carriage body. A magnetic head attached to the tip of the support arm, a spring that biases the tip of the support arm toward the surface of the floppy disk, and a flexible print as a lead wire that is soldered to the terminals of each magnetic head and pulled out to the outside. In a magnetic head carriage including a substrate, the flexible printed circuit board includes a base film having an adhesive layer formed on a surface thereof, a conductive portion disposed on the base film and fixed by the adhesive layer, and the conductive film. With solder plating applied to the surface of the part,
It is achieved by a magnetic head carriage, characterized in that

In the magnetic head carriage according to the present invention, a cover film is preferably provided so as to cross the conductive portion in a region adjacent to a portion to be soldered in the conductive portion of the flexible printed board. There is.

According to the above construction, the flexible printed circuit board as the lead wire from the magnetic head is composed of the conductive portion fixed via the base film and the adhesive layer and the solder plating applied to the surface of the conductive portion. Because
It has a four-layer structure, and the number of layers is smaller than that of a conventional flexible printed board.

Unlike the conventional cover film, the thickness of the solder plating applied to the surface of the conductive portion can be made as thin as about 8 to 10 μm.

Therefore, the flexibility and flexibility of the flexible printed circuit board are not deteriorated, and sufficient flexibility and flexibility can be secured. Therefore, the movement of the carriage body when accessing the floppy disk is not hindered by the bending of the flexible printed circuit board.

Further, with respect to the production of the flexible printed circuit board, the number of steps is reduced, and the material cost and the production cost can be reduced.

Further, since the flexible printed circuit board is not covered with the cover film, the cover film is not stuck and the yield is improved.

In the area adjacent to the portion to be soldered in the conductive portion of the flexible printed circuit board,
When a cover film is provided so as to cross the conductive part, even if molten solder tries to flow along the surface of the conductive part when soldering the terminals of the magnetic head to the flexible printed board, Since the area adjacent to the portion is covered with the cover film, the molten solder is blocked by the cover film, so that the flow of the molten solder is blocked.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. FIG. 1 shows a flexible printed circuit board in a first embodiment of a magnetic head carriage according to the present invention.

In FIG. 1, a flexible printed circuit board 10 is fixedly arranged in a head mounting portion 11 to which terminals of a magnetic head (not shown) forming a magnetic head carriage are to be soldered, for example, in a magnetic head device. It includes a connecting portion 12 to be connected to a connector and the like, and a lead portion 13 including a conductive portion that electrically connects between the head attaching portion 11 and the connecting portion 12. A detailed drawing of the head mounting portion 11 is omitted.

Here, the flexible printed circuit board 10
Are configured as shown in FIG. That is, in FIG. 2, in the flexible printed circuit board 10, the adhesive layer 15 is first formed on the base film 14, and the conductive portion 16 to form the lead wire is disposed on the adhesive layer 15. As a result, the conductive portion 16 can be fixedly held by the adhesive layer 15. Furthermore, on the exposed surface of the conductive portion 16,
The solder layer 17 is formed by solder plating.

The flexible printed circuit board 10 according to the embodiment of the present invention is configured as described above, and the flexible printed circuit board 10 has the number of layers as compared with the conventional flexible printed circuit board 9 shown in FIGS. And the number of steps can be reduced, and the manufacturing cost and the material cost can be reduced.

The solder plating on the surface of the conductive portion 16 is
For example, the head mounting portion 1 of the flexible printed circuit board 10
This can be done simultaneously when soldering the magnetic head to 1. In this case, since the step of forming the solder layer 17 is not necessary, the number of steps can be further reduced.

The flexible printed circuit board 10 constructed as described above is used in the magnetic head carriage 1 as shown in FIG.
Since the flexible printed circuit board 10 has a small number of layers, it is possible to ensure sufficient flexibility and flexibility of the flexible printed circuit board 10. Therefore, when accessing the floppy disk, The movement of the main body 3 along the guide 2 is not hindered by the flexibility and flexibility of the flexible printed circuit board 10, and smooth access is possible.

FIG. 3 shows a flexible printed circuit board 30 in a second embodiment of the magnetic head carriage according to the present invention. 3, the flexible printed circuit board 30 is a modified example of the flexible printed circuit board 20 shown in FIG. 2, and the conductive printed circuit board 30 is electrically conductive so as to cross the conductive portion 33 of the lead portion 32 in a region adjacent to the head mounting portion 31. A cover film 34 is provided on the portion 33. A detailed drawing of the head mounting portion 31 is omitted.

As a result, the flexible printed circuit board 3
When the magnetic head constituting the magnetic head carriage is soldered to the head mounting portion 31 of 0, even if the molten solder tries to flow from the head mounting portion 31 along the conductive portion 33 of the lead portion 32. Since the area of the conductive portion 33 adjacent to the head mounting portion 31 is covered with the cover film 34, the flow of the molten solder along the conductive portion 33 can be blocked.

[0028]

As described above, according to the present invention, the flexible printed circuit board as the lead wire from the magnetic head is fixed to the conductive portion via the base film and the adhesive layer and the surface of the conductive portion. Since it is composed of the applied solder plating, it has a four-layer structure, and the number of layers is smaller than that of the conventional flexible printed circuit board.

Therefore, the flexibility and flexibility of the flexible printed circuit board are not deteriorated, and sufficient flexibility and flexibility can be secured. Therefore, the movement of the carriage body when accessing the floppy disk is not hindered by the bending of the flexible printed circuit board.

Further, with respect to the production of the flexible printed circuit board, the number of steps is reduced, and the material cost and the production cost can be reduced.

Further, since the flexible printed circuit board is not covered with the cover film, the cover film will not be misaligned and the yield will be improved.

In the conductive portion of the flexible printed circuit board, in a region adjacent to a portion to be soldered,
When a cover film is provided so as to cross the conductive part, even if molten solder tries to flow along the surface of the conductive part when soldering the terminals of the magnetic head to the flexible printed board, Since the area adjacent to the portion is covered with the cover film, the molten solder is blocked by the cover film, so that the flow of the molten solder is blocked.

Thus, according to the present invention, an extremely excellent magnetic head carriage having a flexible printed circuit board, which has sufficient flexibility and flexibility with a simple structure and can be reduced in cost, is provided. Will be provided.

[Brief description of drawings]

FIG. 1 is a plan view of a flexible printed circuit board in a first embodiment of a magnetic head carriage according to the present invention.

FIG. 2 is an enlarged cross-sectional view of the flexible printed board of FIG.

FIG. 3 is a partial plan view showing a modified example of the flexible printed board of FIG.

FIG. 4 is a perspective view showing a configuration of an example of a conventional magnetic head carriage for a floppy disk.

5 is a plan view of a flexible printed circuit board in the magnetic head carriage of FIG.

6 is an enlarged cross-sectional view of the flexible printed board of FIG.

[Explanation of symbols]

10, 30 Flexible printed circuit board of magnetic head carriage 11, 31 Head mounting part 12 Connection part 13, 32 Lead part 14 Base film 15 Adhesive layer 16, 33 Conductive part 17 Solder layer 34 Cover film

Claims (2)

[Claims] 1. A support arm swingably held by an elastic plate integrally insert-molded with an attachment portion of a carriage main body, a magnetic head attached to a tip of the support arm, and a support arm. A magnetic head carriage including a spring for urging the tip of the magnetic head toward the surface of the floppy disk, and a flexible printed circuit board as a lead wire which is soldered to the terminals of each magnetic head and pulled out to the outside. The printed circuit board is composed of a base film having an adhesive layer formed on the surface thereof, a conductive portion disposed on the base film and fixed by the adhesive layer, and solder plating applied to the surface of the conductive portion. The magnetic head carriage is characterized in that 2. The cover film is provided so as to cross the conductive portion in a region adjacent to a portion to be soldered in the conductive portion of the flexible printed circuit board. 1. The magnetic head carriage described in 1.