JP2837015B2 - Magnetic head unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head unit for recording, reproducing, and erasing information on a storage medium such as a magnetic disk.

[0002]

2. Description of the Related Art Generally, a magnetic disk drive such as a personal computer includes a flexible disk drive (FD).
D) is frequently used. A magnetic head unit is mounted on the FDD. Further, this magnetic head unit is formed by fixing a magnetic head for recording, reproducing, erasing and the like information to and from a recording medium such as a flexible disk (FD) on a head supporting member called a gimbal plate. . Further, the magnetic head is connected to a wiring member such as a flexible printed circuit board (hereinafter, referred to as an FPC), and the circuit is electrically connected.

Hereinafter, a magnetic head unit on which such a conventional FDD is mounted will be described with reference to FIGS. 4 and 5. FIG.

FIG. 4 is a plan view showing a main part of a conventional magnetic head unit, and FIG. 5 is an enlarged vertical sectional view taken along line AA of FIG.

As shown in FIGS. 4 and 5, in this type of conventional magnetic head unit 1, a magnetic head 2 is made of a predetermined elastic thin plate made of a conductive metal such as stainless steel or a copper alloy. A gimbal plate 3 as a head support member formed in a shape is fixed to a suitable joining member (not shown) such as an adhesive.

The magnetic head 2 comprises a composite magnetic core 4 in which a recording / reproducing magnetic core and an erasing magnetic core are integrally formed, and a pair of magnetic cores made of a non-magnetic material such as ceramic. The slider (not shown) is formed so as to be sandwiched from both sides, and is fixed to the gimbal plate 3 with the slider. A coil bobbin 6 around which a predetermined coil 5 is wound is mounted on each of the magnetic cores 4, and the back core 7 is fixed by a predetermined fixing member such as a clip to form a closed magnetic circuit. Have been. Also, the coil bobbin 6 of the magnetic core 4
Have terminals 8, made of a desired number of conductive materials,
8 project upward toward the gimbal plate 3 in FIG. 5, and the ends of the coil 5 are connected.

An FPC 9 is arranged on the surface of the gimbal plate 3 opposite to the surface to which the magnetic head 2 is fixed. The FPC 9 has a base film 10 as a base, and an appropriate circuit pattern 11 is formed by conductive ink or the like on a surface of the base film 10 opposite to the surface facing the gimbal plate 3, which is one surface. I have. A predetermined number of terminal connection holes 12 are provided at one end of the circuit pattern 11 formed on the FPC 9, and the terminal connection holes 12 are provided on the coil bobbin 6 of the magnetic core 4. The terminal 8 is inserted in a state protruding from the FPC 9 and is electrically connected by a conductive joining member 13 such as solder. The other end is a connector 14 that is electrically connected to a desired circuit (not shown).

[0008]

However, at present,
The performance, size, and thickness of products such as FDDs are constantly being improved, and the performance, size, and thickness of magnetic head units are also being improved. In order to reduce the thickness of the magnetic head unit, the terminals 8 arranged on the coil bobbin 6 of the magnetic core 4 protrude from the terminal connection holes 12 of the FPC 9, which is one of the factors that hinder the reduction in thickness. was there.

[0009] The present invention has been made in view of these points, and overcomes the above-mentioned problems in the conventional art.
It is an object of the present invention to provide a magnetic head unit that has a simple structure, eliminates a factor of hindering thinning due to electrical connection between a terminal of a magnetic core and an FPC, and can achieve high performance, miniaturization, and thinning. Aim.

[0010]

In order to achieve the above-mentioned object, a magnetic head unit according to the present invention has a magnetic head fixed to one surface of a substantially flat head supporting member,
In a magnetic head unit in which a flexible printed circuit board is disposed on the other surface and the terminals of the magnetic head are electrically connected to a circuit pattern of the flexible printed circuit board and a conductive bonding member, A terminal bonding hole is formed in the circuit pattern portion formed on the surface that is not opposed to the terminal, the terminal bonding hole and the terminal are opposed to each other, and the terminal is formed by a conductive bonding member via the terminal bonding hole. And a circuit pattern are electrically connected.

[0011]

According to the magnetic head unit of the present invention having the above-described structure, the terminal provided on the magnetic core can be electrically connected to the circuit pattern formed on the FPC without projecting from the FPC.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIGS. 1 and 2 show a first embodiment of the magnetic head unit of the present invention. FIG. 1 is a longitudinal sectional view of a main part, and FIG. 2 is an enlarged sectional view of a main part.

As shown in FIG. 1, in the magnetic head unit 15 of the present embodiment, the magnetic head 16 is fixed to the gimbal plate 3 as a head support member by an appropriate joining member such as an adhesive in the same manner as in the prior art. Is formed.

The one gimbal plate 3 is made of a conductive metal such as stainless steel or a copper alloy.
After being made into a thin plate having elasticity, it is formed into a predetermined shape by punching with a press or the like.

The other magnetic head 16 has a coil bobbin 19 in which an appropriate coil 18 is wound around a composite magnetic core 17 in which a small recording / reproducing magnetic core and an erasing magnetic core are integrally formed. It is installed. In addition, the coil bobbin 19 has an appropriate shape made of a conductive material so as to protrude in a direction parallel to the gimbal plate 3 on the upper side surface in the drawing in the vicinity of the gimbal plate 3. A body terminal 20 is provided. A rectangular back core 21 is fixed to the magnetic core 17 by an appropriate fixing member such as a clip (not shown). Further, a pair of sliders made of a non-magnetic material such as a ceramic (not shown) is fixedly attached so as to sandwich the magnetic core 17 from both sides.

An FPC 22 is disposed on the surface of the gimbal plate 3 opposite to the surface facing the magnetic head 16. In this FPC 22, an appropriate circuit pattern 2 is formed on the base film 23 using conductive ink or the like.
4 is formed on the surface opposite to the surface facing the gimbal plate 3. A predetermined number of terminal joining holes 25 are provided at one end of the circuit pattern 24 formed on the FPC 22.
Is provided. Further, the circuit pattern 24 formed on the FPC 22 is formed on both surfaces and the inner peripheral surface 26 so as to cover around the terminal bonding hole 25 at the terminal bonding hole 25. The circuit pattern 24 formed on the surface facing the gimbal plate 3 is
The terminal joint hole 25 is set so as not to contact the gimbal plate 3.
Is formed only in a predetermined range around the. This is F
This is because, when the circuit pattern 24 is formed on the surface of the PC 22 facing the gimbal plate 3, the circuit pattern 24 is prevented from coming into contact with the gimbal plate 3 and being short-circuited.
Also, the circuit pattern 24 that contacts the gimbal plate 3
May be covered with an insulator such as a cover film to prevent a short circuit, but the rigidity of the FPC 22 increases,
This is because when the magnetic head unit 15 is mounted on the FDD, the degree of freedom of operation of the magnetic head unit 15 is reduced.

As shown in detail in FIG. 2, the circuit pattern 24 and the terminals 20 provided on the coil bobbin 19 of the magnetic core 17 are connected to the conductive bonding members 13 such as solder so as to fill the terminal bonding holes 25. Are electrically connected in a bridge state. Further, the other end is a connector (not shown) electrically connected to a desired circuit. In addition, it is desirable that the terminal 20 and the terminal joining hole 25 be as close to each other as possible in order to further ensure the bridge-like electrical connection by the conductive joining member 13 and to increase the reliability.

The terminal 20 is formed by the conductive bonding member 13.
The joining operation between the magnetic head 16 and the circuit pattern 24 may be performed from either the magnetic head 16 side or the FPC 22 side.

Next, the operation of this embodiment having the above-described configuration will be described.

The magnetic head unit 15 of this embodiment is downsized by applying a small magnetic core 17 to the magnetic head 16. This small-sized magnetic head 16 can not only cope with the above-described thinned FDD, but also can reduce the size of the magnetic circuit, reduce the magnetic resistance, and improve the efficiency of the magnetic head 16.

As shown in FIGS. 1 and 2, the magnetic head 16 and the FPC 22 are connected to a terminal 20 disposed in a direction parallel to the gimbal plate 3 and a circuit pattern 24 formed on the FPC 22. The conductive bonding member 13 is electrically connected in a bridge state without contacting the gimbal plate 3 so as to fill the terminal bonding hole 25 whose periphery is covered by the circuit pattern 24.
Therefore, according to the present embodiment, unlike the conventional case,
Can be electrically connected to the FPC 22 without protruding from the FPC 22, and the FPC
The factor that hinders the thinning of the magnetic head unit 15 due to the protrusion from the protrusion 22 can be reliably removed.

FIG. 3 shows a second embodiment of the present invention. In this embodiment, the circuit pattern 24 at the terminal joining hole 25 of the first embodiment is replaced with the terminal joining hole 25.
Excluding the inner peripheral portion 27 of the base film 10. Other configurations are the same as those of the first embodiment.

According to the present embodiment having such a structure, the same effects as those of the first embodiment can be obtained, and the circuit pattern 24 is not formed on the inner peripheral portion 27 of the base film 10 of the terminal bonding hole 25. , FPC 22 can be formed very easily.

The circuit pattern 24 at the terminal joining hole 25 may be formed only on the surface opposite to the surface facing the gimbal plate 3.

In this embodiment, the magnetic core 17 in which the recording / reproducing magnetic core and the erasing magnetic core are integrally formed is described.
Has been described for the magnetic head unit 15 using
The present invention can naturally be applied to a single type magnetic head unit using a single recording / reproducing magnetic core and an erasing magnetic core having the FPC 22.

The magnetic head unit 15 of the present invention
Can be naturally applied to a magnetic head such as a hard disk drive and a headphone stereo tape recorder, which can apply the FPC to the electrical connection in addition to the FDD.

The present invention is not limited to the above-described embodiment, but can be modified as needed.

[0029]

As described above, according to the magnetic head unit of the present invention, the circuit pattern of the FPC does not come into contact with the gimbal plate to short-circuit, and the thickness of the magnetic head unit is reduced by projecting the terminal from the FPC. Of the magnetic head unit itself and the performance of the device such as FDD in which the magnetic head unit is mounted,
An extremely excellent effect that the size and thickness can be reduced can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part showing a first embodiment of a magnetic head unit of the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG. 1;

FIG. 3 is a view similar to FIG. 2, showing a second embodiment of the magnetic head unit of the present invention;

FIG. 4 is a front view of a main part showing a conventional magnetic head unit.

FIG. 5 is an enlarged vertical sectional view taken along line AA of FIG. 4;

[Explanation of symbols]

 Reference Signs List 3 Gimbal plate 13 Conductive joint member 15 Magnetic head unit 16 Magnetic head 17 Magnetic core 19 Coil bobbin 20 Terminal 22 FPC 23 Base film 24 Circuit pattern 25 Terminal joint hole

Claims (1)

(57) [Claims] 1. A magnetic head is fixed to one surface of a head supporting member formed in a substantially flat plate shape, a flexible printed circuit board is disposed on the other surface, and terminals of the magnetic head are connected to a circuit pattern of the flexible printed circuit board. And a magnetic head unit electrically connected to the flexible printed circuit board by a conductive bonding member, wherein a terminal bonding hole is formed in the circuit pattern portion formed on a surface of the flexible printed circuit board that does not face the head support member, A magnetic head unit, wherein a joining hole and a terminal are opposed to each other, and the terminal and the circuit pattern are electrically joined by a conductive joining member via the terminal joining hole.