JPH0544095B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a digital magnetic head used in a magnetic disk device, and more specifically, the present invention relates to a digital magnetic head used in a magnetic disk device, and more specifically, the present invention relates to a digital magnetic head used in a magnetic disk device. This relates to a magnetic head that has a gimbal function and has a modular headpiece directly attached to it without using a gimbal plate.

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

Read/write and erase coils are wound around the legs of the head core, and a back core is attached. A printed wiring board on which conductive patterns for relaying coil terminals have been formed is adhered to the gimbal plate in advance, and the coil terminals are soldered to each conductive pattern to assemble the headpiece.

Such a headpiece is then fixed to the distal end of the carriage arm using its gimbal plate. In other words, the conventional technology had a structure in which the carriage arm supported the gimbal plate of the headpiece.

[Problems to be Solved by the Invention] In the case of the currently mainstream double-sided recording system, in order to realize a head posture that is even more difficult to off-track, for example, side 0 is supported by double pivots and side 1 is supported by one pivot. The support structure has been changed so that the side 0
The shape of the gimbal plate is often different between side 1 and side 1. As a result, the configurations of the headpieces that must be assembled become more diverse, resulting in higher material costs, and the need for high-precision assembly on a thin gimbal plate results in the drawback of requiring a large number of assembly steps.

Additionally, the gimbal plate to which the core slider is attached is made of metal and is a good conductor, so placing the end of a thin coil wire along it will prevent a short circuit or continuity to ground in the event that the coating peels off or is damaged. There were problems such as, assembly work such as routing and holding the wire was cumbersome, and there was also a problem in terms of reliability.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art, simplify the structure of the headpiece, make side 0 and side 1 a common module, reduce material costs and assembly man-hours, and reduce the number of coil terminals. To provide a magnetic head that improves processing reliability, prevents deterioration of head posture by providing a gimbal function on the carriage arm side, and has good assembly workability at a low price as a whole.

[Means for Solving the Problems] The present invention, which can achieve the above objects, includes integrally molding a carriage arm so that a gimbal section made of a flexible thin plate is located at the distal end of the carriage body. This magnetic head has a structure in which a modular head piece is mounted on the gimbal part.

The modularized headpiece here can be assembled without using a gimbal plate, such as a configuration in which a core slider is glued onto a printed wiring board and the coil terminal is connected to a relay conductive pattern on the board, or a core It is possible to have a structure in which a relay conductive pattern is directly formed on an outrigger constituting the slider and the coil terminals are connected.

[Function] With the above configuration, the carriage arm itself has a gimbal function, and the modular headpiece can be shared between side 0 and side 1. The main body of the carriage is integrally molded with the gimbal section, so it can be manufactured with high precision and at a low cost. As a result, the assembly process of the magnetic head is simplified, and it is possible to reduce material costs and assembly man-hours, as well as reduce management costs by standardizing parts.

In addition, since the coil terminal is processed on the headpiece without a gimbal plate and placed on the electrical insulator, there is no risk of short-circuiting or conduction with the ground even if the coating peels off on the thin coil wire. Reliability is also improved.

[Embodiment] The magnetic head according to the present invention is composed of a combination of a carriage arm with an integrated gimbal portion and a modular head piece, and FIGS. 1 and 2 show an example of side 0 and side 1 thereof.

The carriage arm is, for example, shown in FIGS.
The structure is as shown in the figure. Here, FIG. 3 shows the carriage arm on side 0, and FIG. 4 shows the carriage arm on side 1. In any case, the carriage arm 10 is connected to the carriage body 12.
A gimbal part 14 made of a flexible thin film is provided at the tip of the
It has a structure in which it is integrally formed by molding so that 16 is located. The gimbal parts 14 and 16 are surrounded by a groove 18 so as to exhibit good flexibility and maintain the correct head posture, and have a mounting hole 20 in the center that is slightly smaller than the head piece. . A head piece is fixed to the gimbal parts 14 and 16 of such a carriage arm 10.

An example of the headpiece is shown in FIG. Figure A is a view seen from the sliding surface side, and Figure B is a view seen from the coil side on the opposite side. head piece 2
2 is composed of a core slider 24, coils 26, 28, a printed wiring board 30, and the like. The core slider 24 consists of a tunnel erase type head core 32 and nonmagnetic outriggers 34 and 35 bonded to both sides thereof. Such a core slider 24 is adhesively fixed to a printed wiring board 30 on both rear sides (on the opposite side to the sliding surface). The printed wiring board 30 has a large number of relay conductive patterns 36 of a predetermined shape on the back surface, and has holes into which the head core 32 and the coils 26 and 28 are inserted. It consists of

A read/write coil 26 and an erase coil 28 are wound around the legs of the head core 32, and a back core 38 is attached to the read/write core side. And read/write coil 26
The four terminals of the erase coil 28 (two of which are grouped together) and the terminal of the erase coil 28 are each connected to a predetermined conductive pattern 36, and a core earth line 40 connects the head core 32 and the conductive pattern to provide a core ground. connected between the two.

The printed wiring board 30 is designed to be slightly larger than the sliding surface of the core slider 24, and assembly of the headpiece is completed by soldering and connecting the coil terminal to the conductive pattern 36. Such a headpiece 22 may have a common structure on both sides of the magnetic recording medium, ie, on both side 0 and side 1.

The structure in which the headpiece 22 shown in FIG. 5 is mounted on the carriage arm 10 shown in FIGS. 3 and 4, respectively, is as shown in FIGS. 1 and 2. In FIG. 1 showing side 0, A is a view seen from the coil side, and B is a view seen from the slider side. Also in FIG. 2 showing side 1, A is a view seen from the coil side, and B is a view seen from the slider side. In any case, the modular head piece 22 is adhesively fixed to the predetermined gimbal parts 14 and 16, and the multi-conductor shield wire 42 is used to fix it to the carriage body 12, and each lead wire 44 is attached to the printed wiring board 30. It is connected to the corresponding conductive pattern 36 formed. side 0 and side 1
Since the orientation of the core slider 24 differs by 180 degrees in the case of side 0, the lead wire 44 is routed and connected so as to pass through the distal end side of the carriage, and in the case of side 1, the lead wire 44 is routed directly from the proximal end side to connect it at the shortest distance. Adopts a pull-out structure.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to only such a structure. In the above embodiment, the core slider is fixed to the printed wiring board to form the head piece, but the structure of the non-magnetic outrigger that makes up the core slider has been modified to form a conductive pattern for relaying the coil terminal on itself. By creating a modular structure, a modular headpiece can be constructed without using a printed wiring board. A head module having such a structure is also applicable to the present invention.

[Effects of the Invention] As described above, the present invention has a structure in which a gimbal part is integrally molded to the distal end of a carriage body to form a carriage arm, and a modular head piece is mounted on the gimbal part. Unlike the conventional technology of gluing onto the gimbal plate, side 0 and side 1 can be made common, and cumbersome processes such as positioning and gluing to the gimbal plate can be omitted, reducing assembly man-hours and component management costs. This has the effect of reducing costs.

Further, in the present invention, since the carriage arm itself has a gimbal function, there is no risk of deterioration of the head posture, and sufficiently satisfactory characteristics can be achieved.

Furthermore, in the present invention, the path from which the end of the thin coil wire is pulled out and connected to the conductive pattern is not on the metal plate but on the electrical insulation material, so even if the thin coil wire's coating peels off, there will be no short circuit or grounding. There is no risk of electrical conduction, and it can be held firmly by resin or the like, which also has the effect of increasing reliability.

[Brief explanation of drawings]

1A and B are explanatory diagrams showing an example of the magnetic head on side 0 according to the present invention, FIGS. 2A and B are explanatory diagrams showing an example of the magnetic head on side 1, and FIG. 3 is an explanatory diagram showing an example of the magnetic head on side 0. An explanatory diagram showing an example of
FIG. 4 is an explanatory view showing an example of the carriage arm of side 1, and FIGS. 5A and 5B are explanatory views showing an example of a modular headpiece. DESCRIPTION OF SYMBOLS 10... Carriage arm, 12... Carriage main body, 14, 16... Gimbal part, 22... Head piece, 24... Core slider, 30... Printed wiring board.

Claims (1)

[Claims] 1. A magnetic head characterized in that a carriage arm is integrally formed by molding so that a gimbal part made of a flexible thin plate is located at the tip of the carriage body, and a modular head piece is mounted on the gimbal part.