JPH05234034A - Magnetic head unit - Google Patents

Abstract

PURPOSE:To provide the magnetic head unit which has a simple structure and can be formed to have higher performance, smaller size and smaller thickness by eliminating the factors for hindering the reduction in the thickness by the electrical connection of the terminals of a magnetic core and an FPC. CONSTITUTION:This magnetic head unit 15 is constituted by fixing a magnetic head 16 to one surface of a head supporting member 3 formed to an approximately flat plate shape, disposing the flexible printed board 22 to another surface and electrically joining the terminals 20 of the magnetic head 16 to the circuit patterns 24 of the flexible printed board 22 by a conductive joining member 13. Namely, terminal joining holes 25 are formed in the circuit pattern 24 part formed on the surface of the flexible printed board 22 on the side not facing the head supporting member 3. These terminal joining holes 25 and the terminals 20 are disposed to face each other and the terminals 20 and the circuit patterns 24 are electrically joined by the conductive joining member 13 via the terminal joining hole 25 parts.

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 / erasing information on / from a storage medium such as a magnetic disk.

[0002]

2. Description of the Related Art Generally, a flexible disk drive (FD) is used for a magnetic storage device such as a personal computer.
D) is frequently used. A magnetic head unit is mounted on this FDD. Further, this magnetic head unit is formed by fixing a magnetic head for recording / reproducing / erasing information on a recording medium such as a flexible disk (FD) to 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 FPC) to electrically connect the circuits.

A conventional magnetic head unit equipped with such an FDD will be described below with reference to FIGS. 4 and 5.

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 the line AA of FIG.

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

In the magnetic head 2, a pair of composite magnetic cores 4 in which a recording / reproducing magnetic core and an erasing magnetic core are integrally formed are made of a non-magnetic material such as ceramics. It is formed so as to be sandwiched from both sides by a slider (not shown), and is fixed to the gimbal plate 3 with the slider. A coil bobbin 6 around which a predetermined coil 5 is wound is attached to each of the magnetic cores 4, and the back core 7 is fixed by a predetermined fixing member (not shown) such as a clip to form a closed magnetic circuit. Has been done. In addition, the coil bobbin 6 of the magnetic core 4
Includes terminals 8 made of a desired number of conductive materials,
.. projecting upward in FIG. 5 toward the gimbal plate 3, 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 the surface opposite to the one surface of the base film 10 facing the gimbal plate 3. There is. A predetermined number of terminal connecting holes 12 are provided at one end of the circuit pattern 11 formed on the FPC 9. The terminal connecting holes 12 are provided in the coil bobbin 6 of the magnetic core 4. The terminal 8 is inserted in a state protruding from the FPC 9 and 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]

By the way, at present,
Products such as FDDs are constantly being made higher in performance, smaller and thinner, and magnetic head units are also being made higher in performance, smaller and thinner like products. 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 connecting holes 12 of the FPC 9, which is one of the factors that hinder the reduction in thickness. was there.

The present invention has been made in view of these points, and overcomes the above-mentioned problems with the conventional ones.
(EN) Provided is a magnetic head unit having a simple structure, capable of achieving high performance, downsizing, and thinning by removing a factor that obstructs thinning due to electrical connection between a magnetic core terminal and an FPC. To aim.

[0010]

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

[0011]

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

[0012]

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

1 and 2 show a first embodiment of a magnetic head unit according to the present invention. FIG. 1 is a longitudinal sectional view of an essential part and FIG. 2 is an enlarged sectional view of the essential part.

As shown in FIG. 1, in the magnetic head unit 15 of this embodiment, the magnetic head 16 is fixed to the gimbal plate 3 which is a head supporting member by an appropriate joining member such as an adhesive as in the conventional case. Has been formed.

The one gimbal plate 3 is made of a conductive metal such as stainless steel or copper alloy,
After being formed into an elastic thin plate, 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 a suitable shape made of a conductive material on the upper side surface in the drawing close to the gimbal plate 3 in a direction parallel to the gimbal plate 3. Body terminals 20 are provided. The 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 ceramic (not shown) is fixed 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 with conductive ink or the like.
4 is formed on the surface opposite to the surface facing the gimbal plate 3. Then, a predetermined number of terminal bonding holes 25 are formed 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 sides and the inner peripheral surface 26 in the portion of the terminal joint hole 25 so as to cover the periphery of the terminal joint hole 25. The circuit pattern 24 formed on the surface facing the gimbal plate 3 is
Terminal connection hole 25 so that it does not contact with 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 to cause a short circuit.
In addition, the circuit pattern 24 that contacts the gimbal plate 3
It may be possible to prevent the short circuit by covering the above with an insulating material such as a cover film, 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.

Further, as shown in detail in FIG. 2, the circuit pattern 24 and the terminal 20 provided on the coil bobbin 19 of the magnetic core 17 are filled with the terminal joining hole 25 by a conductive joining member 13 such as solder. 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 terminals 20 and the terminal joint holes 25 are as close as possible to each other in order to make the bridge-like electrical connection by the conductive joint member 13 more reliable and highly reliable.

The terminal 20 made of the conductive joining member 13 is used.
The bonding work between the circuit pattern 24 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-mentioned structure will be described.

The magnetic head unit 15 of this embodiment is made compact by applying a small magnetic core 17 to the magnetic head 16. This small-sized magnetic head 16 can not only be compatible with the thinned FDD described above, but also can reduce 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 provided with a terminal 20 arranged in a direction parallel to the gimbal plate 3 and a circuit pattern 24 formed on the FPC 22. The electrically conductive joining member 13 is electrically joined in a bridge state without contacting the gimbal plate 3 so as to fill the terminal joining hole 25 covered with the circuit pattern 24.
Therefore, according to the present embodiment, unlike the conventional case, the terminal 20
Can be electrically connected to the FPC 22 without protruding from the FPC 22, and the FPC of the terminal 20 can be connected.
It is possible to reliably remove the factor that hinders the thinning of the magnetic head unit 15 due to the protrusion from 22.

FIG. 3 shows a second embodiment of the present invention. In this embodiment, the circuit pattern 24 in the terminal joining hole 25 portion of the first embodiment described above is replaced with the terminal joining hole 25.
It is formed by excluding the inner peripheral portion 27 of the base film 10. The other structure is similar to that of the first embodiment described above.

According to this embodiment having such a structure, the same effect as that of the first embodiment described above is 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. , The circuit pattern 24 is very easily formed on the FPC 22.

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

Further, in the present embodiment, the magnetic core 17 in which the recording / reproducing magnetic core and the erasing magnetic core are integrally formed.
The magnetic head unit 15 using
The present invention can naturally be applied to a stand-alone 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
In addition to the FDD, of course, it can also be applied to a device to which the FPC can be applied for electrical connection, for example, a magnetic head such as a hard disk drive or a headphone stereo tape recorder.

Further, the present invention is not limited to the above embodiment, but can be modified as necessary.

[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 cause a short circuit, and the magnetic head unit is thinned by the protrusion of the terminal from the FPC. It is possible to surely remove the obstructing factors of the magnetic head unit itself and the performance of the apparatus such as the FDD in which the magnetic head unit itself is mounted,
It has an extremely excellent effect that it can be made smaller and thinner.

[Brief description of drawings]

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

FIG. 2 is an enlarged cross-sectional view of the main part of FIG.

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.

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

[Explanation of symbols]

 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)

[Claims] 1. A magnetic head is fixed to one surface of a substantially flat plate-shaped head support member, 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. In the magnetic head unit electrically joined by a conductive joining member, a terminal joining hole is formed in the circuit pattern portion formed on the surface of the flexible printed circuit board that does not face the head supporting member, and the terminal is formed. A magnetic head unit characterized in that 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 through the terminal joining hole portion.