JPH0760502B2 - Magnetic head - Google Patents

Description

The present invention relates to a digital magnetic head used in a magnetic disk device, and more specifically, a core slider is directly mounted on a printed wiring board and a coil terminal is provided on the board. The present invention relates to a magnetic head modularized by connecting to a conductive pattern.

[Prior Art] In a flexible magnetic disk drive, for example, a core slider having a structure in which, for example, a tunnel erase type head core is sandwiched by nonmagnetic outriggers from both side surfaces is often used. Such a core slider is usually positioned and bonded on a gimbal plate made of a thin metal plate as a reference.

The read / write and erase coils are wound around the legs of the head core, and the back core is mounted. A printed wiring board on which a conductive pattern for relaying coil terminals is formed in advance is adhered to the end of the gimbal plate, the coil terminals are soldered to each conductive pattern, and the magnetic head is assembled.

[Problems to be Solved by the Invention] In the case of the double-sided recording method which is currently mainstream, in order to realize a head posture that is more difficult to offtrack, for example, side 0 is a double pivot support and side 1 is a 1 pivot. The support structure is changed to support it,
Accordingly, the side 0 and side 1 often have different gimbal plate shapes. Therefore, there is a drawback that the structure of the magnetic head to be assembled is diversified, and the material cost and the assembly man-hour are large.

Also, since the gimbal plate to which the core slider is attached is made of metal and is a good conductor, if a terminal of a thin coil wire is arranged along it, in the unlikely event that the coating is peeled off or damaged, short-circuit or grounding may occur. There is a problem such as continuity,
Assembling work such as wiring and holding of the wire is complicated and there is a problem in reliability.

The object of the present invention is to eliminate the above-mentioned drawbacks of the conventional technique, simplify the structure, and make the side 0 and the side 1 common, thereby reducing the material cost and the assembly man-hour, and the coil terminal. It is an object of the present invention to provide a magnetic head having an improved structure in which the lead-out portion does not come into contact with the metal portion and the reliability can be improved.

[Means for Solving Problems] According to the present invention which can achieve the above object, a core slider having a head core is directly fixed to a printed wiring board on which a conductive pattern for coil terminal relay is formed. The magnetic head is configured such that the ends of the coil wound around the leg portion of the head core are connected to the conductive pattern to form a module, and can be mounted as it is on the tip portion of the carriage arm.

Here, as the printed wiring board, a ceramic substrate or the like may be used in addition to the glass-based epoxy resin substrate. For mounting the magnetic head on the carriage arm, a gimbal portion having a predetermined shape is integrally formed in advance by a mold or the like on the carriage arm according to the required specifications, and attached to it.

[Operation] When the core slider is not fixed to the gimbal plate but is fixed to the printed wiring board and the coil end is connected to the conductive pattern, the magnetic head is shared by the side 0 and the side 1. it can. Therefore, the assembly of the magnetic head is greatly simplified. In addition, the coil terminals are arranged and held along the printed wiring board,
Since the terminal can be soldered as it is, even if the coating of the wire material is damaged or the like, there is no possibility of causing a short circuit or conduction to the ground, and reliability is improved.

The magnetic head thus assembled may be mounted as it is on the tip portion of the carriage arm, so that it is possible to reduce the material cost and the assembling man-hour, or to reduce the management cost by sharing the members.

[Embodiment] FIG. 1 shows an embodiment of a magnetic head according to the present invention. FIG. 1A is an explanatory view seen from the sliding surface side, and FIG. 1B is seen from the opposite coil side. FIG.

The core slider 10 is a tunnel erase type head core 12
And non-magnetic outriggers 14 and 16 adhered to both sides thereof. Such a core slider 10 has a printed wiring board 18 on the rear surface (the surface opposite to the sliding surface) side.
It is fixed by adhesion. The printed wiring board 18 has a large number of conductive patterns 20 of a predetermined shape on the back surface and has a structure in which holes for inserting the head core 12 and the coil are formed, and is composed of a glass-based epoxy resin substrate, a ceramic substrate, or the like. .

A read / write coil 22 and an erase coil 24 are wound around the legs of the head core 12, and a back core 26 is attached to the read / write core side. The four terminals of the read / write coil 22 (two of which are grouped together) and the two terminals of the erase coil 24 are each connected to a predetermined conductive pattern 20, and a core ground is provided to establish a core ground. A line 28 is connected between the head core 12 and one of the conductive patterns.

The printed wiring board 18 is designed to be slightly larger than the sliding surface of the core slider 10, and connecting the coil end to the conductive pattern 20 completes the assembly of the magnetic head.
Such a magnetic head may have a structure common to both sides of the magnetic recording medium, that is, both side 0 and side 1.

Such a magnetic head can be mounted on the carriage arm as it is. 2 shows an example of the side 0 carriage arm, and FIG. 3 shows an example of the side 1 carriage arm. Although the shape of the gimbal portion is different, the gimbal portion 30, 32 made of a thin metal plate formed into a predetermined shape is used in any case.
Is integrally molded with the carriage body 34. The gimbal portions 30 and 32 have a shape in which the periphery is surrounded by a kerf 36 in order to have an appropriate flexibility and to express a good head posture, and a mounting hole 38 slightly smaller than the printed wiring board 18 is provided in the center. Is. Then, the magnetic head as shown in FIG. 1 is fixed to the gimbal portions 30 and 32 of such a carriage arm.

FIGS. 4 and 5 show a state in which the magnetic head is fixedly attached to the gimbal portions 30 and 32 and connected. Figure 4 shows side 0,
FIG. A is an explanatory view seen from the coil side, and FIG. B is an explanatory view seen from the slider side. FIG. 5 shows the side 1, FIG. 5A is an explanatory view seen from the coil side, and FIG. 5B is an explanatory view seen from the slider side. In any case, a multi-conductor shielded wire 40 is used, which is fixed to the carriage main body 34, and each lead wire 42 is formed on the printed wiring board 18, and the corresponding conductive pattern 20 is formed.
Connected to. Since the direction of the core slider 10 is 180 degrees different between the side 0 and the side 1,
Is connected so as to pass through the leading end of the carriage, and in the case of the side 1, the lead wire 42 is directly pulled out from the base end side at the shortest distance.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to such a structure. In the above embodiment, the magnetic heads are mounted on the flexible gimbal portion on both side 0 and side 1. However, in some cases, the side 0 is mounted directly on the carriage body without providing the gimbal portion, and the side 1 is mounted on the gimbal. It can also be combined so that it can be mounted on a part.

[Advantages of the Invention] According to the present invention, as described above, the core slider is directly fixed to the printed wiring board and the coil end is connected to the conductive pattern to assemble the magnetic head. Therefore, the core slider is bonded onto the gimbal plate. Different from the conventional technique, the side 0 and the side 1 can be shared, so that the number of assembling steps and member management costs can be reduced, and the cost can be reduced.

Further, in the present invention, since the path from the end of the thin coil wire rod to the connection to the conductive pattern is on the electric insulating material, even if the coating of the wire rod is damaged, a short circuit or conduction to the ground may occur. There is no effect, and there is an effect that it can be firmly held by resin or the like and reliability is increased.

[Brief description of drawings]

1A and 1B are explanatory views showing an example of a magnetic head according to the present invention, FIG. 2 is an explanatory view of a side 0 carriage arm suitable for incorporating the magnetic head according to the present invention, and FIG. 3 is a side 1 4A and 4B are assembly explanatory diagrams of side 0, and FIGS. 5A and 5B are assembly explanatory diagrams of side 1. 10 …… Core slider, 12 …… Head core, 18 …… Printed wiring board, 20 …… Conductive pattern, 22 …… Read / write coil, 24 …… Erase coil, 30,32 …… Gimbal part, 34… … Carriage body.

Claims (1)

[Claims] 1. A core slider incorporating a head core,
A carriage that is directly fixed to a printed wiring board on which a conductive pattern for coil terminal relay is formed, and ends of the coil wound around the leg of the head core is connected to the conductive pattern to form a module, and a gimbal portion is molded at the tip. A magnetic head, which can be mounted on the gimbal portion of the arm as it is.