JPS6289212A - Gimbal type magnetic head - Google Patents

Abstract

PURPOSE:To improve the electromagnetic conversion efficiency by giving an approximately T-shaped form to the larger one of two nonmagnetic outriggers and including the fulcrum of a gimbal plate into the adhesion surface with the gimbal plate at the foot part of T-shaped outrigger. CONSTITUTION:Two nonmagnetic outriggers 26 and 28 are prepared. The larger outrigger 26 has a T-shaped form with a foot part 30 orthogonal to the side face of a head core 20. A gimbal plate 32 is adhered to the face 30a of a slider assembly at the side opposite to the rubbing surface of a medium. Thus a coil can be put into the foot part of the core 20 at the medium side against the plate 32. This can shorten the magnetic path formed at the rear part of the core 20 and therefore the length of a magnetic circuit is reduced. Thus the electromagnetic conversion efficiency is improved with a gimbal type magnetic head.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a digital magnetic head used in a magnetic disk drive, and more specifically, at least one of the non-magnetic outriggers attached to the side surface of the head core is
This invention relates to a gimbal-type IF head that has a letter-shaped structure and is bonded to include the fulcrum of the gimbal plate.

[Prior Art] In flexible magnetic disk drives, digital magnetic heads such as tunnel erase type or straddle erase type are often used to ensure compatibility of magnetic recording media (hereinafter simply referred to as "medium"). These magnetic heads have a structure in which a slider assembly with non-magnetic outriggers arranged on both sides of the head core is adhered to a gimbal plate so that its media sliding/moving surface slightly protrudes, and the gimbal plate is pivotably supported. The structure is such that it can maintain good contact with the medium.

A predetermined winding is applied to the head core in order to write and output information. In the prior art, the slider assembly is bonded so that the leg portion of the head core passes through the gimbal plate, and a coil is wound around the leg portion on the opposite side from the medium sliding surface.

Incidentally, one of the features of flexible magnetic disk devices is that the medium is replaceable. For ease of handling, the medium is housed in a case called a shake. The jacket is provided with an oval cutout (bed window) to allow the magnetic head to slide into contact with the medium, and is housed in an envelope to protect it when not in use. Recently, a hard shell with a shutter attached to the head window has been developed. As a result, the thickness of the jacket has changed from the conventional 1 mm or less to 3 to 3 mm.
41, and accordingly, the length of the slider assembly protruding from the gimbal plate of the gimbal type magnetic head is also increasing.

[Problems to be Solved by the Invention] Simply increasing the protrusion dimension of the slider assembly in the media direction in order to accommodate such a hard jacket type,
The head core is correspondingly longer, which is an obstacle to making the magnetic disk drive thinner, the magnetic path is longer, the electromagnetic conversion efficiency is lowered, and the head core is more likely to break, making the slider assembly heavier.

For example, as shown in FIG. 5, when sandwiching both sides of the core 10 with two large and small non-magnetic outriggers 12 and 4, both non-magnetic outriggers 12 and 14 are each formed into an abbreviated shape. , so that the winding space can be secured by sandwiching the head core 10 near the medium sliding surface,
A possible configuration is to wind a coil around the medium sliding surface of the gimbal plate.

Although this configuration can solve the above-mentioned problems such as the length of the head core, it also weakens the rigidity near the fulcrum of the gimbal plate, making the contact between the nod and the medium and the posture of the head unstable. A new problem arises: stability.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, to shorten the dimension of the head core in the direction perpendicular to the medium, thereby making it possible to reduce the thickness of the magnetic disk device, and to achieve high electromagnetic conversion efficiency. The head core is less likely to break,
Moreover, it is an object of the present invention to provide an improved gimbal-type magnetic head in which the contact state between the head core and the medium and the attitude of the head can be easily set to an optimum state.

[Means for Solving the Problems 1] The present invention, which can achieve the above-mentioned objects, has two large and small non-magnetic outriggers disposed on both sides of the head core, the larger outrigger being arranged at approximately T. This is a gimbal-type magnetic head that has a letter-shaped structure and is adhesively fixed so that the adhesive surface of the leg portion to the gimbal plate includes the fulcrum of the gimbal plate.

Therefore, the larger non-magnetic outrigger has a structure with legs that are perpendicular to the side surface of the head core. The navel core penetrating portion of the gimbal plate is a relatively large opening, and the coil also passes through it and is wound around the head core on the medium sliding surface side of the gimbal plate.

[Function] Since the larger non-magnetic outrigger has a roughly T-shaped structure and is glued to include the fulcrum of the gimbal plate, the rigidity near the fulcrum is strengthened and the fulcrum becomes clear, allowing the connection between the head and the medium. The contact state and the posture of the head can be set to the optimum state, achieving extremely good operation.

As a result, the area of the opening through which the head core of the gimbal plate passes can be increased, allowing the coil to be installed closer to the sliding surface of the head core through it, significantly shortening the magnetic path length on the bank side of the head core and improving electromagnetic conversion efficiency. In addition, the head core is less likely to break.

[Embodiment] FIG. 1 is an exploded perspective view showing an example of a slider assembly for a gimbal-type magnetic head used in the present invention. The head core 2o has a structure that combines a read/write core 22 and an erase core 24, and has two large and small parts on both sides.
A slider assembly is constructed by sandwiching the two non-magnetic outriggers 26 and 28. Figure 2 shows the structure of the assembled slider assembly viewed from the gimbal/plate adhesive side.

As is clear from these drawings, in the present invention, at least the larger non-magnetic outrigger 26 of the two large and small non-magnetic outriggers 26, 28 is provided with leg portions 30 that are substantially orthogonal to the side surface of the head core 20. It has a roughly T-shaped structure. This point is a major feature of the present invention. Second
In the figure, a surface 30a (indicated by diagonal lines) of the slider assembly opposite to the medium sliding surface is the adhesive surface to the gimbal plate.

The gimbal plate 32 is typically 0.05-0.1 mI
The slider assembly is made of a metal elastic plate having a diameter of about 3.5 mm, and has a dividing slit 34 surrounding the slider assembly, as shown in FIG. 3, to maintain good contact with the medium. The center portion has an opening 36 into which the leg portion of the head core 20 is inserted. This opening 36 is different from the conventional one and has a relatively large area through which not only the head core 20 but also a coil (not shown) wound around the head core 20 can pass through. A protrusion 38 is formed in the center thereof so that the adhesive surface 30a of the leg 30 of the non-magnetic outrigger 26 is attached thereto.

As shown in FIG. 3, the slider assembly as described above is adhesively fixed on the surface opposite to the medium sliding surface.

At that time, the gimbal plate 32 is attached so that the adhesive surface 30a exactly includes the fulcrum 0 of the gimbal plate 32. Therefore, in the present invention, the slider assembly is bonded on the fulcrum 0 of the gimbal plate 32, and the bonded surfaces thereof are each rectangular in shape, and the short sides and long sides of the slider assemblies are bonded and fixed so that they are approximately at right angles to each other. be done.

With this structure, the rigidity near the fulcrum 0 of the gimbal plate 32 is strengthened, the fulcrum 0 becomes clear, and the contact state of the slider assembly with the medium and the attitude of the head core can be easily set to the optimum state. Become. At the same time, by increasing the rigidity near the fulcrum 0, it is possible to widen the opening 36 of the gimbal plate 32 near where the legs of the head core 20 are inserted, and the coil can be inserted through the opening 36. becomes. As a result, the coil can be inserted into the leg of the navel core on the media side with respect to the gimbal plate 32, making it possible to significantly shorten the magnetic path at the rear of the head core, thereby shortening the magnetic circuit and greatly increasing electromagnetic conversion efficiency. This will improve the results.

FIG. 4 is an explanatory diagram showing another example of a slider assembly suitable for use in the present invention. Since the basic configuration is the same as that of the previous embodiment, corresponding parts are denoted by the same reference numerals and a description thereof will be omitted. In the embodiment described above, the smaller non-magnetic outrigger 28 has a substantially T-shaped structure, but as shown in FIG. 4, the smaller non-magnetic outrigger 28 may also have a substantially T-shaped structure.

However, as shown in Figures 1 and 2, the non-magnetic outrigger 2
6.2B is preferably a combination of a substantially T-shaped structure and an abbreviated-shaped structure because the adhesion to the gimbal plate is stabilized.

In any case, if the structure of the present invention is adopted, the two large and small non-magnetic outriggers are approximately T-shaped or abbreviated-shaped, so they can be produced by cutting and do not have complicated shapes using molds, etc. Therefore, the price can be reduced.

[Effects of the Invention] As described above, in the present invention, the larger non-magnetic outrigger of the two large and small non-magnetic outriggers arranged on both sides of the head core has a substantially T-shaped structure, and its adhesive surface is attached to the gimbal. Since the configuration includes the fulcrum of the plate, the rigidity near the fulcrum of the gimbal plate is strengthened, the fulcrum becomes clear, and the contact state of the magnetic head with the medium and the attitude of the magnetic head can be easily set to the optimum state. This has an excellent effect.

Additionally, as mentioned above, the rigidity near the fulcrum of the gimbal plate has been strengthened, making it possible to widen the area of the opening through which the gimbal plate's umbilical core leg passes, making use of that opening. It is now possible to insert the coil on the media side of the gimbal plate, making it possible to shorten the dimension of the head core in the direction perpendicular to the media, thereby making the magnetic disk device thinner and shortening the magnetic path length. This has the excellent effect of improving electromagnetic conversion efficiency and preventing breakage of the heft core.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing one embodiment of the slider assembly used in the present invention, Fig. 2 is a perspective view of the assembled state as seen from the adhesive side, and Fig. 3 is a gimbal view of the slider assembly. For installation, refer to explanatory diagram showing the condition, No.4
The figure is a perspective view showing another embodiment of the slider assembly used in the present invention, and FIG. 5 is a perspective view showing an example of the slider assembly. 20... Head core, 26. 28... Non-magnetic outrigger, 32... Gimbal plate, 36... Opening for inserting the head core leg, 0... Fulcrum of gimbal plate.

Claims (1)

[Claims] 1. In a magnetic head consisting of a slider assembly in which two large and small non-magnetic outriggers are arranged on both sides of the head core and bonded to a gimbal plate so that the medium sliding surface protrudes, the larger non-magnetic outrigger is It has a substantially T-shaped structure with legs substantially perpendicular to the side surface of the head core, and is characterized in that the adhesive surface of the bottom of the legs to the gimbal plate includes the fulcrum of the gimbal plate. Gimbal type magnetic head.