JPH08339523A - Magnetic head supporting device - Google Patents

Abstract

PURPOSE: To reduce the manufacturing cost and to enhance the reliability by eliminating joining work of a magnetic head to a flexible printed board having a head cable pattern for connecting the magnetic head to a main body. CONSTITUTION: The magnetic head 2 is supported by plural electroconductive spring plates 21 disposed in a radial shape. One end of each individual spring plate 21 is connected with end parts of a recording and reproducing coil 9 and an erasing coil 11 respectively. The spring plates 21 are used as both functions of supporting the magnetic head 2 and of leader lines.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for supporting a magnetic head having magnetic recording, reproducing and erasing functions.

[0002]

2. Description of the Related Art A magnetic head having a function of recording, reproducing and erasing information is elastically supported on a magnetic recording medium of a floppy disk device (hereinafter referred to as FDD) by a thin leaf spring called a gimbal spring. The flexible printed circuit board (hereinafter referred to as FPC) is used for external connection. 9 to 11 are views showing a conventional magnetic head supporting device, FIG. 9 is a perspective view of a carriage assembly, FIG. 10 is a perspective view of a magnetic head seen from a sliding surface side,
FIG. 11 is a perspective view of the magnetic head viewed from the back bar side.

In FIG. 9, 1 is a carriage driven by a stepping motor (not shown) to position a magnetic head, and 2 is a lower S fixed to a gimbal spring 3.
/ 0 magnetic head, 4 is the upper S / 1 magnetic head 5
An arm (not shown) is fixed, and 6 is a flexible printed circuit board (hereinafter referred to as FPC) shown in FIGS. 10 and 11.

In FIG. 10 and FIG. 11, 8 is a recording / reproducing head core around which a recording / reproducing coil 9 is wound, 10 is an erasing head core around which an erasing coil 11 is wound, and 12
Is a back bar made of a magnetic material such as ferrite that is fixed to both head cores 8 and 10 and forms a closed magnetic circuit.
4 is a holder for sandwiching both head cores 8 and 10;
Is a shield ring that reduces the influence of external magnetic field,
The members 8 to 15 are combined and fixed to the gimbal spring 3 with a resin adhesive.

The FPC 6 has a head cable pattern 16
To which the ends of the coils 9 and 11 are connected, and
It is connected to the DD body (not shown). The conventional magnetic head supporting device is configured as described above, and the carriage 1
The positions of the magnetic heads 2 and 5 are determined by the movement of, and information is recorded, reproduced, and erased on a magnetic recording medium (not shown) sandwiched between the magnetic heads 2 and 5.

[0006]

In the magnetic head supporting device as described above, the FPC 6 having the gimbal spring 3 and the head cable pattern 16 is separately configured and both are joined. Work such as matching is required. Further, there is a problem that the FPC 6 may adversely affect the postures of the magnetic heads 2 and 5 when the magnetic head device thus bonded is bonded to the carriage assembly.

The present invention has been made in order to solve the above problems, and provides a magnetic head supporting device which eliminates the FPC joining work and can reduce the manufacturing cost and increase the reliability. With the goal.

[0008]

A magnetic head support device according to a first aspect of the present invention uses a plurality of radially arranged elastic conductive plates as spring plates supported by the magnetic head. To the ends of the coils of the magnetic head.

A magnetic head support device according to a second aspect of the present invention is the magnetic head support device according to the first aspect of the present invention, in which a bent portion is formed in the middle of each spring plate.

A magnetic head support device according to a third aspect of the present invention is the magnetic head support device according to the first and second aspects of the present invention, wherein each spring plate is covered with an insulating film except at both ends thereof.

A magnetic head supporting device according to a fourth aspect of the present invention is the magnetic head supporting device according to any one of the first to third aspects, wherein the magnetic head is adhered to a fixing plate made of an insulating material, and each spring plate is adhered to the fixing plate. .

A magnetic head support device according to a fifth aspect of the present invention is the magnetic head support device according to any one of the first to fourth aspects of the present invention, wherein a carriage on which external wiring is laid is provided, and the other end of each spring is bonded to the carriage and Connected to.

[0013]

According to the first aspect of the present invention, the magnetic head is supported by a plurality of radially arranged conductive spring plates, and the ends of the coil of the magnetic head are connected to one end of each spring plate. Therefore, the spring plate is gimbal spring and FP
Also serves as C.

Further, in the second aspect of the invention, since each spring plate is bent in the middle thereof, the followability to the displacement of the magnetic head is good.

Further, in the third aspect of the invention, since a portion other than both ends of each spring plate is covered with an insulating film, most of each spring plate is insulated.

Further, in the fourth aspect of the invention, since the magnetic head is adhered to the fixed plate and the spring plates are adhered to the fixed plate, the magnetic head is connected to the spring plates via the fixed plate.

Further, in the fifth invention, since the other end of each spring is bonded to the carriage and connected to the external wiring of the carriage, each spring plate is connected to the fixed external wiring.

[0018]

【Example】

Example 1. 1 to 4 are views showing one embodiment of the first and fifth inventions of the present invention, FIG. 1 is a perspective view, FIG. 2 is a plan view,
3 is a perspective view of a carriage portion, FIG. 4 is a view showing a spring plate adhesive portion, (A) is a plan view, (B) is (B) of FIG.
It is a line cross-sectional view, and the same parts as those of the conventional device are denoted by the same reference numerals (the same applies to the following embodiments).

In FIGS. 1 and 2, reference numeral 21 denotes a plurality of (five in the embodiment) spring plates radially arranged and formed by elastic conductive plates, one end of which is bonded to the holders 13 and 14, respectively. The ends of the coils 11 and 12 are connected to this. In FIGS. 3 and 4, an FPC 6 also serving as an external wiring is bonded to the carriage 1.
Reference numeral 23 is an adhesive such as epoxy that adheres the spring plate 21 to the carriage 1, and 24 is solder that connects the spring plate 21 to the land portion of the FPC 6.

In the magnetic head supporting device constructed as described above, the magnetic head 2 is supported by one end of the spring plate 21 radially arranged, and the other end of the spring plate 21 is adhered to the carriage 1. . One end of the spring plate 21 is connected to both coils 9 and 11, and the other end is connected to the FPC 6 of the carriage 1. Since the other end of the spring plate 21 is directly fixed to the carriage 1 and connected to the FPC 6, it is possible to use inexpensive parts for connecting the main body without losing the posture which has been deteriorated by the FPC 6 in the related art. Become. The FPC 6 may be replaced by a flat cable (FFC) made of inexpensive polyester.

Example 2. FIG. 5 is a plan view showing another embodiment of the first invention of the present invention. This example is the same as Example 1.
5 has five spring plates 21, whereas it has four spring plates 21, and has the same effect as that of the first embodiment.

Example 3. FIG. 6 is a plan view showing an embodiment of the second invention of the present invention. In this embodiment, the spring plate 21
Is bent at 90 degrees at two points on the way. Thus, in addition to the effect shown in the first embodiment, the magnetic head 2 can follow the undulation of the magnetic recording medium without losing its posture. Further, since the spring plate 21 is formed by a technique such as pressing and etching, a highly accurate one can be obtained.

Embodiment 4 FIG. FIG. 7 is a view showing an embodiment of a third invention of the present invention, (A) is a perspective view of an end portion of a spring plate,
(B) is a cross-sectional view of (A). In this embodiment, the spring plate 21 is covered with an insulating film 26 except for both ends thereof. As described above, since the spring plate 21 is mostly covered with the insulating film 26, it is possible to prevent electrical contact with other parts. Further, since there is no insulating film 26 on both ends of the spring plate 21, connection with the magnetic head 2 and the main body is easy, and a simple short circuit can be prevented.

Example 5. FIG. 8 is an exploded perspective view showing an embodiment of the fourth invention of the present invention. In the figure, 28 is a fixed plate made of a metal plate covered with an insulating material or an insulating plate such as glass epoxy, and a through hole 28a is provided in the peripheral portion thereof. That is, the magnetic head 2 is bonded and fixed to the fixed plate 28, one end of the spring plate 21 is bonded to the peripheral edge of the fixed plate 28, and the spring plate 21 and the solder are soldered through the coil end from the magnetic head 2 and the through hole 28a. Worn.

In this way, in addition to the effect shown in the first embodiment, there is an effect that the adhesion of the magnetic head 2 and the fixing of the spring plate 21 can be carried out in a stable state.

[0026]

As described above, according to the first aspect of the present invention, the magnetic head is supported by a plurality of radially arranged conductive spring plates, and the coil of the magnetic head is attached to one end of each spring plate. Since the end parts of the FPC are connected, the spring plate also serves as a gimbal spring and an FPC,
There is an effect that the manufacturing cost can be reduced because the joining action accompanied by the centering of the PC is not required. Also, FPC
There is an effect that it is possible to improve the reliability by eliminating the adverse effect on the posture of the magnetic head due to the joining with the magnetic head.

Further, in the second invention, since each spring plate is bent in the middle thereof, the followability with respect to the displacement of the magnetic head is good,
Even if the magnetic recording medium has undulations, the magnetic head can follow the undulations without losing its posture.

In addition, in the third invention, since the portions other than both ends of each spring plate are covered with the insulating film, most of each spring plate is insulated, and electrical contact with other parts and simple short circuit are prevented. There is an effect that can be.

Further, in the fourth invention, since the magnetic head is adhered to the fixed plate and each spring plate is adhered to the fixed plate, the magnetic head is connected to each spring plate through the fixed plate, and the magnetic head and the spring plate are connected. Has the effect that it can be fixed in a stable state.

Further, in the fifth invention, since the other end of each spring plate is adhered to the carriage and is connected to the external wiring of the carriage, each spring is connected to the fixed external wiring.
There is an effect that the posture of the magnetic head can be prevented from being deteriorated by connecting to C, and an inexpensive member can be used for connecting to the main body.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a plan view of FIG.

3 is a perspective view of a carriage portion on which the magnetic head of FIG. 1 is mounted.

4A and 4B are views showing a spring plate adhesive portion of FIG. 3, in which FIG. 4A is a plan view and FIG. 4B is a sectional view taken along line BB of FIG.

FIG. 5 is a plan view showing a second embodiment of the present invention.

FIG. 6 is a plan view showing Embodiment 3 of the present invention.

7A and 7B are views showing Embodiment 4 of the present invention, in which FIG. 7A is a perspective view of an end portion of a spring plate, and FIG. 7B is a cross-sectional view of FIG.

FIG. 8 is an exploded perspective view showing a fifth embodiment of the present invention.

FIG. 9 is a perspective view of a carriage assembly showing a conventional magnetic head supporting device.

FIG. 10 is a perspective view of the magnetic head of FIG. 9 viewed from the sliding surface side.

FIG. 11 is a perspective view of the magnetic head of FIG. 9 viewed from the back bar side.

[Explanation of symbols]

1 carriage, 2 magnetic head, 6 external wiring (flexible printed circuit board), 9 recording / reproducing coil, 11
Erasing coil, 21 spring plate, 23 adhesive, 24
Solder, 26 insulating film,

Claims (5)

[Claims] 1. A device for supporting a magnetic head having a coil through a spring plate, wherein a plurality of elastic conductive plates radially arranged are used as the spring plate, and one end of each of the spring plates is provided with the coil. A magnetic head support device characterized in that the ends are connected. 2. The magnetic head supporting device according to claim 1, wherein a bent portion is formed in the middle of each spring plate. 3. The magnetic head supporting device according to claim 1, wherein each spring plate is covered with an insulating film except for both ends thereof. 4. A magnetic head is adhered to a fixing plate of an insulator,
4. The magnetic head supporting device according to claim 1, wherein each spring plate is adhered to the fixed plate. 5. A carriage provided with external wiring is provided, and the other end of each spring plate is bonded to the carriage and connected to the external wiring. The magnetic head support device described in 1.