JPH0619811B2 - Magnetic head - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital magnetic head used in a magnetic disk device, and more specifically, at least one of nonmagnetic outriggers attached to a side surface of a head core is provided on a rear side. The present invention relates to a magnetic head which has a supporting piece protruding outward and is provided with a conductive pattern on the supporting piece so as to be connected to a coil terminal and which can be mounted on a carriage as it is by the supporting piece.

[Prior Art] In a flexible magnetic disk drive, a tunnel erasing type or straddle erasing type head core is used, and it is sandwiched from both sides with non-magnetic outriggers to form a core slider, and the medium sliding surface is projected. As is the case with the gimbal plate, it is often used.

An example of the prior art will be described with reference to FIGS. 4 and 5.
FIG. 4 is a perspective view of the gimbal type magnetic head as seen from the medium sliding surface side, and FIG. 5 is a perspective view as seen from the opposite side.

Non-magnetic outriggers 1 arranged on both sides of the head core 10
2, 14 are the head core 1 only in the vicinity of the medium sliding surface.
The end face has a substantially L-shaped structure so as to be fixed to 0. The core slider thus combined and laminated is polished on the medium sliding surface side and then aligned and bonded on the gimbal plate 16.

Then, the coil 18 is wound around the leg portion of the head core 10 so as to be housed in the inner space formed by the two outriggers 12 and 14, and the back core 20 is attached to the core on the read / write side. Each terminal of the coil 18 is soldered and connected to the conductive pattern 24 of the printed wiring board 22 which is previously bonded to the gimbal plate 16.

The magnetic head assembly is constructed in this manner, and is assembled to the head carriage.

[Problems to be Solved by the Invention] However, in the above-described structure, a high-cost gimbal plate is required, and the core slider must be bonded to the resin with high accuracy. There was a drawback that it required adhesive technology and the workability was poor. In addition, there is a problem in that the resin adhesive used has moisture resistance and adhesive strength, which makes quality control difficult.

Furthermore, since the gimbal plate is composed of a thin metal plate, when the coil end is pulled out along with it, there is a risk that it will be electrically connected to the ground due to peeling of the insulating coating on the surface, etc., sufficient measures to protect and fix the wire material. Must be taken,
Also in this respect, there is a drawback that workability is poor.

The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art,
To provide a magnetic head in which the shape of the outriggers arranged on both sides of the head core is modified so that the outriggers can perform a part of the function of the conventional gimbal plate so that the core slider can be directly mounted on the head carriage. It is in.

[Means for Solving the Problems] According to the present invention, the outriggers arranged on both sides of the head core are fixed to the head core only in the vicinity of the sliding surface, and the leg portion of the head core is formed in the inner space formed by the two outriggers. It is premised on a magnetic head having a structure in which a coil is wound around.

In order to achieve the above-mentioned object, in the present invention, at least one of the outriggers has a shape having a supporting piece protruding outward at the rear side (opposite side to the sliding surface). A conductive pattern is provided on one piece to connect the coil end, and the support piece can be directly assembled to the head carriage.

That is, according to the present invention, the outrigger is not mounted on the gimbal plate, but the core slider is mounted on the gimbal plate.
It has a great feature in that the shape of the plate is devised so as to have a part of the function of the plate so that the magnetic head assembly can be finished.

The conductive pattern provided on the support piece may have a structure in which a printed wiring board is attached to the surface of the support piece, or a structure in which the conductive pattern is directly formed on the surface of the support piece by a technique such as metallization or plating.

[Operation] When the structure of the outrigger is formed into a shape having a supporting piece whose rear side projects outward as described above, and a conductive pattern is provided on it, the end of the coil wound around the leg portion of the head core becomes the conductive pattern. Gimbal by connecting
Assembling as a magnetic head is completed without using a plate. That is, when the non-magnetic outriggers are bonded to both sides of the head core, it is sufficient to measure the dimensions with high accuracy as in the conventional case, and the step of positioning and bonding to the gimbal plate is not necessary, which makes it extremely easy to manufacture.

Also, the coil end is pulled out and fixed along the non-magnetic outrigger, but since this non-magnetic outrigger is generally made of electrically insulating ceramics such as potassium titanate, even if the coil wire is damaged by the coating, it is grounded. It is possible to easily wire and fix the wire without electrical connection with the wire.

[Embodiment] FIG. 1 is a perspective view showing one embodiment of a core slider of a magnetic head according to the present invention as seen from the sliding surface side, and FIG. 2 is a perspective view as seen from the rear side of the magnetic head. Is. As is apparent from FIG. 1, this magnetic head has a structure in which non-magnetic outriggers 32 and 34 are arranged on both sides of a head core 30. These outriggers 32 and 34 are notched on the inside so as to form an inner space for accommodating the coil, and are in contact with the head core 30 only in the vicinity of the sliding surface, and at the rear side. The support pieces 32a and 34a projecting outward are formed into an integral structure.

The outriggers 32 and 34 having such a structure are the head core 3
They are arranged so as to sandwich 0, and are fixed and integrated to form a core slider in a state in which the dimensions of the head core 30 and the gap position are strictly set. Then, the medium sliding surface of this core slider is polished. This assembling and polishing process is basically the same as that of the prior art, although the shape of the outrigger is different.

In the present invention, the conductive pattern is provided on the support piece of the outrigger of such a core slider. In this embodiment, the surface of one support piece 32a (the surface opposite to the sliding surface)
Then, a printed wiring board 38 having a large number of conductive patterns 36 of a predetermined shape is attached. Then, the read / write and erase coils 40 and 42 are respectively inserted into predetermined legs of the head core 30, and the back core 44 is attached to the read / write side. The assembly of the magnetic head is completed by soldering the wire ends from the coils 40 and 42 and the core ground wire 46 to the predetermined conductive patterns 36, respectively.

The magnetic head assembled in this manner has a support piece 32.
The rear surface of a and 34b (the portion shown by cross-hatching in FIG. 2) can be mounted as it is on the head carriage (not shown) using the reference surface as a reference surface.

FIG. 3 is a perspective view showing another embodiment of the present invention. Since the basic structure may be the same as that shown in FIGS. 1 and 2, corresponding parts are designated by the same reference numerals and the description thereof will be omitted. In this embodiment, the conductive pattern 50 is directly formed on the support piece 32a of the outrigger 32 without using a printed wiring board. The non-magnetic outriggers 32 and 34 are generally made of a ceramic material such as potassium titanate. Since this kind of material is electrically insulating, it is possible to use it to form the conductive pattern 50 in a predetermined shape by means such as metallization, plating, or vapor deposition, and through it, the coil terminal or core ground wire. And an external lead wire (not shown).

As still another embodiment, although not shown, a flexible printed wiring board is used, one end of which is attached to a support piece of an outrigger, and leads are directly drawn out to be connected to an external circuit. It is possible.

In the above embodiment, both non-magnetic outriggers have a supporting piece. However, the supporting piece is provided only on the outrigger on which the conductive pattern is provided, and the other has no supporting piece and the end face is simply L-shaped. The shape may be such that

[Effects of the Invention] In the present invention, the shape of the outrigger is devised as described above so that at least one of them has a supporting piece protruding outward at the rear side, and a conductive pattern is provided on it to connect the coil terminal. With this configuration, it is no longer necessary to align the core slider with the resin and bond the core slider with the gimbal plate as a reference, so not only can the gimbal plate cost be reduced, but also the gimbal plate can be accurately positioned. Since the bonding step becomes unnecessary and the bonding strength does not become a problem, the assembly work step is greatly simplified and the number of steps can be reduced, which is an excellent effect.

Further, in the present invention, when the coil terminal is pulled out, the coil terminal is arranged and fixed along the electric insulator, so that even if the coating of the coil wire material is peeled off or the like, a short circuit or conduction to the ground does not occur, and the operation reliability is improved. There is an increasing effect.

Further, in the case of a double-sided flexible magnetic disk, since the shapes of the gimbal plates used in the magnetic heads located on both sides are generally different, it is necessary to prepare them separately, but in the present invention, only one kind of magnetic head is assembled. Can be used for both Side 0 and Side 1,
In that respect, it also has the effect of increasing production efficiency.

[Brief description of drawings]

FIG. 1 is a perspective view showing one embodiment of a core slider of a magnetic head according to the present invention as seen from the sliding surface side, FIG. 2 is a perspective view as seen from the rear side of the magnetic head, and FIG. FIG. 4 is a perspective view showing another embodiment of the magnetic head according to the present invention, FIG. 4 is a perspective view showing an example of the prior art seen from the sliding surface side, and FIG. 5 is a perspective view seen from the rear side. 30 ... Head core, 32, 34 ... Non-magnetic outrigger, 32a, 34a ... Supporting piece, 36 ... Conductive pattern, 38 ... Printed wiring board, 40, 42 ... Coil, 50 ... Conductive pattern.

Claims (1)

[Claims] 1. Outriggers arranged on both sides of a head core are fixed to the head core only in the vicinity of a sliding surface, and a coil is wound around a leg portion of the head core so as to be housed in an inner space formed by both outriggers. In the magnetic head
At least one of the outriggers has a shape having a support piece protruding outward at the rear side thereof, a conductive pattern is provided on the support piece to connect the coil terminal, and the support piece can be directly assembled to the head carriage. A magnetic head characterized by the above.