JPH0658757B2 - Gimbal type magnetic head - Google Patents

Description

Description: TECHNICAL FIELD 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 the side surface of the head core is substantially T-shaped.
The present invention relates to a gimbal type magnetic head having a V-shaped structure and bonded so as to include a fulcrum of a gimbal plate.

[Prior Art] In a flexible magnetic disk device, a tunnel erasing type or straddle erasing type digital magnetic head is often used in order to ensure compatibility of a magnetic recording medium (hereinafter, simply referred to as "medium"). These magnetic heads have a slider assembly in which non-magnetic outriggers are arranged on both sides of the head core, and are bonded to the gimbal plate so that the medium sliding surface of the head assembly protrudes slightly, and the gimbal plate is pivoted. Is configured to maintain good contact with the medium.

A predetermined winding is provided on the head core for writing and reading information. In the prior art, the slider assembly is bonded so that the leg portion of the head core penetrates the gimbal plate, and the coil is wound around the leg portion on the side opposite to the medium sliding surface.

By the way, one of the characteristics of the flexible magnetic disk device is that the medium is exchangeable. For easy handling, the medium is contained in a case called a jacket.
The jacket is provided with an oval notch (head window) for allowing the magnetic head to slidably contact the medium, and is housed in an envelope to protect it when not in use. Recently, a hard jacket type in which a shutter is attached to the head window has been developed. As a result, the thickness of the jacket is 3 to 4 mm from the conventional 1 mm or less.
The gimbal type magnetic head has a longer protrusion of the slider assembly from the gimbal plate.

[Problems to be Solved by the Invention] In order to deal with such a hard jacket type, simply increasing the protrusion dimension of the slider assembly in the medium direction,
As a result, the head core becomes longer, which hinders the thinning of the magnetic disk device, the magnetic path is long, the electromagnetic conversion efficiency is lowered, and breakage easily occurs, resulting in a heavy slider assembly.

Therefore, for example, as shown in FIG. 5, when sandwiching both side surfaces of the head core 10 with two large and small non-magnetic outriggers 12 and 14, each of the non-magnetic outriggers 12 and 14 has a substantially L-shaped structure. It is possible to secure a winding space by clinging to the medium 10 near the sliding surface,
A configuration is conceivable in which a coil is wound around the medium sliding surface side of the gimbal plate.

With such a configuration, the problems such as the lengthening of the head core as described above can be solved, but the rigidity near the fulcrum of the gimbal plate becomes weak, and the contact state between the head and the medium and the posture of the head become unstable. A new problem arises.

The object of the present invention is to solve the above-mentioned drawbacks of the conventional technique and to shorten the dimension of the head core in the direction perpendicular to the medium, which makes it possible to reduce the thickness of the magnetic disk device.
Another object of the present invention is to provide an improved gimbal-type magnetic head which has high electromagnetic conversion efficiency, is less likely to break the head core, and can easily set the contact state between the head core and the medium and the posture of the head to the optimum state. .

[Means for Solving the Problems] In the present invention that can achieve the above object, the larger outrigger of the two large and small non-magnetic outriggers disposed on both side surfaces of the head core is substantially T. A gimbal-type magnetic head having a V-shaped structure, in which the bonding surface of the leg portion of the gimbal plate to the gimbal plate includes the fulcrum of the gimbal plate.

The central opening of the gimbal plate has a shape in which both sides are large and the central part is narrowed by the protrusion so that not only the head core but also the coil wound around the head core can be fitted therein. The larger non-magnetic outrigger has its side surface abutting against the center core foot of the head core to prevent breakage. Further, the bonding surface of the leg portion of the non-magnetic outrigger with the gimbal plate is bonded to the protruding portion.

[Operation] Since the larger non-magnetic outrigger has a substantially T-shaped structure and is bonded to the gimbal plate so as to include the fulcrum, the rigidity near the fulcrum is reinforced and the fulcrum is clarified, and the head and the medium are The contact state and the posture of the head can be set to the optimum state, and extremely good operation is realized.

Along with that, the area of the opening through which the head core of the gimbal plate penetrates can be increased, so that the coil can be installed above the sliding surface of the head core through it, and the magnetic path length on the back side of the head core is greatly shortened, resulting in electromagnetic conversion efficiency. While improving, the breakage of the head core is less likely to occur.

[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 20 has a structure in which a reading / writing core 22 and an erasing core 24 are combined, and the size of each of the two sides is 2
The nonmagnetic outriggers 26 and 28 are attached to each other to form a slider assembly. FIG. 2 shows the structure of the assembled slider assembly as seen from the gimbal plate bonding surface 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 has the leg portion 30 substantially orthogonal to the side surface of the head core 20. It has a substantially T-shaped structure. This is a major feature of the present invention. Second
In the figure, a surface 30a (indicated by diagonal lines) on the side opposite to the medium sliding surface of the slider assembly is an adhesive surface with the gimbal plate.

The gimbal plate 32 is generally made of a metal elastic plate having a thickness of about 0.05 to 0.1 mm, and as shown in FIG. 3, divided slits 34 are formed so as to surround the slider assembly so that good contact with the medium can be maintained. It has a simple structure. The central portion has an opening 36 into which the leg of the head core 20 is inserted. Unlike the conventional one, the opening 36 has a relatively large area so that not only the head core 20 but also a coil (not shown) wound around the head core 20 can penetrate. Then, the non-magnetic outrigger 2 is exactly located in the center of the
The protrusion 38 is formed so that the adhesive surface 30a of the leg portion 30 of No. 6 is attached.

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 adhesive surface 30a is attached so as to include the fulcrum O of the gimbal plate 32. Therefore, in the present invention, the slider assembly is adhered onto the fulcrum O of the gimbal plate 32, and the adhering surfaces thereof are rectangular in shape, and the adjoining short sides thereof and the longitudinal variations are substantially right angles. Fixed.

With such a structure, the rigidity of the gimbal plate 32 in the vicinity of the fulcrum O is strengthened, the fulcrum O is clarified, and the contact state of the slider assembly with the medium and the posture of the head core can be easily set to the optimum state. Become. At the same time, since the rigidity near the fulcrum O is increased, the opening 36 of the gimbal plate 32 near the leg portion of the head core 20 can be widened, and the coil can be inserted through the opening 36. Becomes As a result, the coil can be inserted into the leg part of the head core on the medium side with respect to the gimbal plate 32, and the magnetic path at the rear part of the head core can be remarkably shortened, so that the magnetic circuit is shortened and the electromagnetic conversion efficiency is significantly increased. Will be improved.

FIG. 4 is an explanatory view showing another example of the slider assembly suitable for use in the present invention. Since the basic structure is the same as that of the above-mentioned embodiment, the corresponding parts are designated by the same reference numerals and the description thereof is omitted. In the above embodiment, the smaller non-magnetic outrigger 28 has a substantially L-shape, but as shown in FIG. 4, the smaller non-magnetic outrigger 28 may also have a substantially T-shape. However, as shown in FIGS. 1 and 2, the non-magnetic outriggers 26 and 28 are substantially T-shaped.
A combination of the V-shaped structure and the substantially L-shaped structure is preferable because it stabilizes the adhesion to the gimbal plate.

In any case, according to the structure of the present invention, since the two large and small non-magnetic outriggers are substantially T-shaped or L-shaped, they can be produced by cutting, and are not complicated shapes such as molds. Therefore, price reduction is realized.

[Effect of the Invention] According to the present invention, the larger non-magnetic outrigger out of the two large and small non-magnetic outriggers arranged on both side surfaces of the head core as described above has a substantially T-shaped structure, and the bonding surface thereof is a gimbal. Since it is configured to include the fulcrum of the plate, the rigidity near the fulcrum of the gimbal plate is strengthened and the fulcrum is clarified, 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. There is an excellent effect.

Further, as the rigidity near the fulcrum of the gimbal plate is strengthened as described above, it is possible to widen the area of the opening through which the head core leg of the gimbal plate penetrates, and use the opening to coil the coil. Can be inserted on the medium side with respect to the gimbal plate, and the dimension of the head core in the direction perpendicular to the medium can be shortened, which makes it possible to reduce the thickness of the magnetic disk device and shorten the magnetic path length, thereby reducing the electromagnetic path. The excellent effect that the conversion efficiency is improved and the breakage of the magnetic head can be prevented is produced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a slider assembly used in the present invention, FIG. 2 is a perspective view of the assembled state as seen from the bonding surface side, and FIG. 3 is a gimbal of the slider assembly. Explanatory drawing showing the attachment state of the
FIG. 5 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 head core leg, O ... Support point of gimbal plate.

Claims (1)

[Claims] 1. A magnetic head in which a slider assembly having two large and small non-magnetic outriggers arranged on both sides of a head core is adhered to a gimbal plate so that a medium sliding surface of the slider assembly is protruded. The opening is shaped so that both sides are large and the center is narrowed by the protrusion so that not only the head core but also the coil wound around it can be inserted.The larger non-magnetic outrigger is almost orthogonal to the side surface of the head core. Forming a substantially T-shaped structure having a leg portion, the side surface of the leg portion is in contact with the center core foot of the head core, and the bonding surface of the bottom surface of the leg portion with the gimbal plate includes the fulcrum of the gimbal plate. A gimbal type magnetic head characterized in that it is adhered to the protrusion as described above.