JPH0411279Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a head device, and more specifically, a recording or reproducing head is movably attached to a support member movably supported in a cantilever manner, and a flexible printed circuit board is attached to the head device. The present invention relates to a head device in which the head element is connected to a lead wire for external circuit connection through a lead wire.

[Prior Art] As a head device of this type, there is a magnetic head device used in a floppy disk device that records and reproduces information on both the upper and lower surfaces of a flexible disk-shaped recording medium, so-called a floppy disk. The structure described above is adopted for the magnetic head side that performs recording and reproduction.

The conventional structure of this magnetic head device is as shown in FIG. 5. The upper and lower surfaces of a disk 2 of a magnetic recording medium are held between magnetic heads 1 and 3 under a predetermined pressure, and the disk 2 is rotated. Magnetic heads 1 and 3 are brought into sliding contact with the upper and lower surfaces of 2 to record or reproduce information.

The lower magnetic head 3 is movably attached via an elastic plate 8 to the tip of a carriage 7 that supports the entire device. The carriage 7 is slidably provided on a guide shaft (not shown), and is driven along the radial direction of the disk 2 by a driving means (not shown).

The upper magnetic head 1 is movably attached to the lower surface of the distal end of the arm 6 via an elastic plate 9. The arm 6 has a leaf spring 10 planted on the rear end surface.
, a convex portion 7a formed at the rear end of the carriage 7.
It is cantilevered and movable in the vertical direction by tightening and fixing it together with a crank-shaped spring column 12 using a fixing screw 11 on the top. A spring 13 elastically loaded between the spring column 12 and the arm 6 presses the arm 6 downward, thereby causing the magnetic heads 1 and 3 to sandwich the disk 2.

Furthermore, the transmission of recording and reproduction signals between the upper magnetic head 1 and the recording and reproduction circuit of a floppy disk device (not shown) is carried out by a flexible printed circuit board 4 and a cable 5 covered by bundling a plurality of lead wires 14. It is done through.

One end of the flexible printed circuit board 4 is an elastic plate 9
and is connected to the magnetic head 1, and the other end is fixed on the arm 6. A lead wire 14 of the cable 5 is connected to the conductive pattern on this fixed end portion by soldering. The cable 5 is fixed on the arm 6 near the connection part, and is routed on the arm 6 and led to a recording/reproducing circuit (not shown).

[Problems to be solved by the invention] However, according to the connection structure between the flexible printed circuit board 4 and the cable 5 as described above, the circuit board 4
Since the thickness of the conductive pattern portion is extremely thin at 30 to 40 μm, there is a problem in that the conductive pattern portion is easily peeled off, that is, disconnected, due to the high heat during soldering.

In addition, since the cable 5 is routed on the arm 6, the magnetic heads 2 and 3 are pushed against the disk 2 by the pressing force of the spring 13 transmitted via the arm 6 due to the influence of the unstable load of the cable 5. There was a problem in that the clamping force became unstable and the recording and reproducing characteristics of the magnetic heads 2 and 3 became unstable.

This is applicable not only to this magnetic head device, but also to recording,
Even if the reproduction method is different, this problem is common to all head devices having the same head element support structure and connection structure using the same flexible printed circuit board as described above.

[Means for Solving the Problems] In order to solve the above-mentioned problems, according to the present invention, a recording or reproducing head is movably attached to a support member, and the head element is connected to the outside via a flexible printed circuit board. In a head device connected to a lead wire for circuit connection, a conductive terminal having rigidity is fixed to the support member, and one end of the terminal is crimped to the conductive pattern at the end of the substrate on the intermediate portion of the support member. In addition to being electrically connected to this, the board is mechanically fixed to the support member, and the other end of the terminal is connected to the lead wire below the support side end of the support member. .

[Function] According to such a structure, the flexible printed circuit board and the conductive terminal are connected by pressure contact, so unlike the case of soldering, the conductive pattern portion of the flexible printed circuit board does not peel off. Further, since the lead wire is connected to the conductive terminal below the support side end of the head support member, it is not routed around on the support portion.

[Example] Hereinafter, details of an example of the present invention will be described with reference to FIGS. 1 to 4. The above-mentioned magnetic head device for a floppy disk device is used as an example here, and in FIGS. 1 to 4, the same or corresponding parts as in FIG. 5 of the conventional example are given the same reference numerals and Detailed explanation of the parts will be omitted.

FIG. 1 is an exploded perspective view showing the structure of the magnetic head device of this embodiment.

As shown in the figure, in this embodiment, the plate spring 1 of the arm 6 is placed on the convex portion 7a of the carriage 7 as in the conventional device.
0 and spring support 12 with screws 11, 11, holes 12a, 12a (one not shown), 10a, 1
It is assembled by tightening and fixing through 0a and screw holes 7b, 7b. Similarly, the magnetic head 3 is attached to an elastic plate 8 on the upper surface of the distal end of the carriage 7.
The magnetic head 1 is attached to the lower surface of the tip of the arm 6 via an elastic plate 9 (not shown). In addition, the spring support 12 and the arm 6
A spring 13 is loaded between them.

In this embodiment, the connection structure of the flexible printed circuit board (hereinafter abbreviated as printed circuit board) 4 that connects the magnetic head 1 and each lead wire 14 of the cable 5 is different from the conventional one.
Cable 5 through each of the continuity terminals shown at 5.
is connected to each lead wire 14 of.

The conduction terminals 15 have sufficient rigidity and are formed from a conductive material into the shape of a crank-shaped rectangular rod, and are provided in a number corresponding to the conductive patterns 4a on the printed circuit board 4. The conductive terminal 15 is embedded in the arm 6 by insert molding during molding of the arm 6, and its tip end is connected to the printed circuit board 4 at the middle part of the arm 6, as shown in FIG. 2a. The fixed ends on the arm 6 side are lined up and exposed in the vicinity of the opening 6a for guiding onto the arm 6. Further, the rear end portion of the conduction terminal 15 is connected to the first
As shown in the figure, the rear end of the arm 6, that is, the leaf spring 10
It is lined up and exposed on the lower surface side of the support side end.

On the other hand, as shown in FIG. 2a, a square hole 4b is formed at the end of the printed circuit board 4 connected to the conduction terminal 15, into which the end of each conduction terminal 15 exposed on the arm 6 is fitted. This square hole 4b is arranged approximately at the center of the connection portion of the end of each conductive pattern 4a on the printed circuit board 4.

Then, as shown by the arrow in FIG. 2a, the end of the printed circuit board 4 is overlapped with the exposed portion of each conductive terminal 17 of the arm 6, and each of the conductive terminals 15 is fitted into each of the square holes 4b, as shown in FIG. As shown in FIG. 4B, each conductive terminal 15 is connected to each conductive pattern 4a by bending the tip of each conductive terminal 15 exposed on the printed circuit board 4 and bringing it into pressure contact with each conductive pattern 4a. Furthermore, the end portion of the printed circuit board 4 is fixed onto the arm 6 by this bending.

Further, as shown in FIG. 3, each of the lead wires 14 of the cable 5 is connected to each of the conductive terminals 15 exposed on the lower surface side of the rear end of the arm 6 by soldering.

In this way, the printed circuit board 4 and the cable 5 are connected via the conduction terminal 15. cable 5
is guided to the recording/reproducing circuit of the floppy disk device through a groove 7c formed on the upper surface of the convex portion 7a of the carriage 7 shown in FIG.

In addition, the continuity terminal 15 and the lead wire 1 of the cable 5
4 is connected to cable 5 as shown in Figure 4.
This is done by connecting and coupling the female connector 16 to the (lead wire 14) in advance, inserting the conduction terminal 15 into a female contact (not shown) inside the connector 16, and press-fitting and coupling. According to the connection structure of the printed circuit board 4 and the cable 5 via the conductive terminal 15 of this embodiment as described above, the connection between the conductive pattern 4a of the printed circuit board 4 and the conductive terminal 15 is not by soldering but by pressure contact. Therefore, peeling and disconnection of the conductive pattern 4a can be prevented.

Further, since the cable 5 is connected to the lower surface of the rear end of the arm 6 and is not routed on the arm 6, the influence of the load of the cable 5 on the arm 6 is small, and the magnetic heads 1 and 3 are not forced to clamp the disk 2. Prevents pressure from becoming unstable.

Note that in the above structure, both ends of the conduction terminal are exposed above and below the arm 6, and the conduction terminal 15 is connected to the arm 6.
However, if the conductive terminal can be firmly fixed to the arm 6, it is not necessary to bury it.

Furthermore, it goes without saying that this kind of connection structure can be applied not only to magnetic head devices for floppy disk drives, but also to all the types of head devices mentioned in the first section of the industrial application field, and similar effects can be expected. It is.

[Effects] As is clear from the above description, according to the present invention, the recording or reproducing head is movably attached to the support member, and the head element is connected to the lead wire for external circuit connection via the flexible printed circuit board. In the head device connected to the substrate, a rigid conductive terminal is fixed to the support member, and one end of the terminal is crimped to the conductive pattern at the end of the substrate on the intermediate portion of the support member to connect it electrically. At the same time, the board is mechanically fixed to the support member, and the other end of the terminal is connected to the lead wire below the supporting end of the support member. Since the lead wires are not routed on the head support member, the influence of the load on the lead wires on the recording and reproducing operations can be reduced, and recording and reproducing characteristics can be improved.

Furthermore, according to the present invention, in order to connect the flexible printed circuit board of the head and the lead wire for external circuit connection, a reliable electrical connection can be achieved by crimping the conductive terminal without using methods that involve high heat such as soldering. It is possible to prevent peeling and disconnection of the conductive pattern part due to heat, and to attach and fix the flexible printed circuit board to the head support member, and to precisely control the position using screws or other special installation methods. This method has the excellent effect of being able to perform both operations at the same time without using any parts, avoiding other negative effects caused by high heat such as the soldering mentioned above, and always achieving high reliability, high stability, and high head position accuracy. is obtained.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing the structure of a magnetic head device according to an embodiment of the present invention, FIGS. 2a and 2b are explanatory diagrams of a method of connecting the flexible printed circuit board and the conductive terminal in FIG. 1, respectively, and FIG. 3 1 is a perspective view of the conduction terminal and cable connection portion in FIG. 1, FIG. 4 is a perspective view showing another connection structure of the connection portion, and FIG. 5 is a front view showing the structure of a conventional magnetic head device. be. 1, 3... Magnetic head, 4... Flexible printed circuit board, 5... Cable, 6... Arm, 7
... Carriage, 8, 9 ... Elastic plate, 14 ... Lead wire, 15 ... Continuity terminal.

Claims (1)

[Claims for Utility Model Registration] 1. In a head device in which a recording or reproducing head is movably attached to a support member, and the head element is connected to a lead wire for external circuit connection via a flexible printed circuit board, A conductive terminal having a conductive terminal is fixed to the support member, and one end of the terminal is crimped to the conductive pattern at the end of the substrate on the intermediate portion of the support member to be electrically connected thereto, and the substrate is mechanically connected to the conductive pattern. A head device, wherein the head device is fixed to the support member, and the other end of the terminal is connected to the lead wire below the support side end of the support member. 2. The head device according to claim 1, wherein the conductive terminal is embedded in the support member with both ends of the conduction terminal exposed above and below the support member.