JPH0580726B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic head used for recording or reproducing information on a magnetic disk.

BACKGROUND OF THE INVENTION In recent years, magnetic storage devices such as floppy disk devices have been widely used as external storage devices for computers, but demands for smaller size and higher density are increasing. In order to meet this demand,
In terms of dimensions, the height is limited, and high efficiency is also required in terms of magnetic efficiency. An effective means of increasing magnetic efficiency is to reduce the magnetic resistance of the core.

The magnetic resistance R is given by R=l/μS. Here, l is the magnetic path length, S is the cross-sectional area, and μ is the magnetic permeability.

From this relationship, the larger the cross-sectional area of the core portion is, and the shorter the magnetic path length is, the smaller the magnetic resistance can be. Therefore, in order to lower the magnetic resistance of the core, it is better to make the total height of the core as small as possible.

The adhesive structure of the back bar in a conventional magnetic head will be explained below.

FIG. 3 is a side view of a first example of a conventional magnetic head, and FIG. 4 is a side view of a second example.

In the figure, 1 is a slider, 2 is a back bar, 3 is a coil, 4 is a gimbal, and 5 is a core.

Here, the back bar 2 is bonded to the leg of the core 5 with resin.

Problems to be Solved by the Invention The example shown in FIG. 3 is of a type in which the coil 3 is placed outside the slider 1 via a gimbal 4.
The mounting position of the back bar 2 is outside the coil 3, and the total height of the core 5 is the height of the slider 1 + the height of the coil 3 + the gimbal thickness + the width of the back bar 2, and the total height L of the core is quite high.

The example shown in FIG. 4 is of a type in which a coil 3 is inserted into a slider 1. Compared to the first example, the total height of the core 5 is due to the coil 3 being lowered into the slider 1.
Although L' is lower, L' needs to be larger than the height of the slider 1 in order to attach the back bar 2 to the core 5.

The present invention solves the above-mentioned conventional problems and provides a magnetic head in which the efficiency of the head can be increased by shortening the magnetic path length of the core.

Means for Solving the Problems The present invention forms a concave portion in a slider to form a space for accommodating a back bar, and the back bar is arranged so that the core and joint surface of the back bar are located on the same plane as the joint surface between the slider and the core. It is equipped with means to support the

Function: Since the back bar does not occupy any more space than the slider, the overall height can be significantly reduced.

Embodiment FIG. 1 is an assembled view of a slider assembly of a magnetic head in one embodiment of the present invention, and FIG. 2 is a side view of the slider assembly.

In the figure, 1a and 1b are slider half sections,
2 is a back bar, 3 is a coil, 5 is a core, and 6 is a spring. The slider half section 1a is provided with a recess 1a' for forming a space for accommodating the back bar 2 and the coil 3.

Back bar 2 is core 5 and slider half section 1a
It is sandwiched between the core 5 and biased toward the core 5 by a spring 6. With this configuration, the position of the back bar 2 is the same as the slider half section 1.
It can be positioned inside without protruding from the bottom surfaces of a and 1b. In the conventional structure, the total height of the core could not be kept below the height of the slider, but according to this embodiment, it is possible to keep the total height of the core below the height of the slider.

At this time, the elastic material that is inserted between the core 5 and the slider half section and presses down the back bar 2 is
For example, the spring 6 is not limited to BeCu, but may also be made of elastic materials such as rubber.

Also, the back bar 2 does not use the spring 6,
A method of adhering with resin may also be considered.

One possible method of bonding is to bond the core 5 and the slider half section 1b with resin or other material in advance, and then bond the back bar 2 and the slider half section 1a.

Effects of the Invention As described above, according to the present invention, by forming a recess for forming a space for accommodating the back bar in the slider and accommodating the back bar in the space, no extra space for the back bar is required. Therefore, the total height of the head can be greatly reduced, and since the total height of the core itself can be reduced, the efficiency of the magnetic circuit can be increased.

Furthermore, in the present invention, a recess is provided in the slider by providing means for supporting the back bar so that the joint surface of the back bar with the core is located on the same plane as the joint surface of the slider and the core. It is no longer necessary to increase the machining accuracy so high in the case of the wafer, making the machining easier.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a magnetic head in one embodiment of the present invention, FIG. 2 is a side view of the same, and FIGS.
The figure is a side view of a conventional magnetic head. 1a, 1b...slider half section, 2...back bar, 5...core, 6...spring.

Claims (1)

[Claims] 1 A recess for forming a space for accommodating a back bar is provided in one half section of the slider, the back bar is accommodated in this recess, and the back bar, the slider half section core, and the other half section of the slider are bonded together. . A magnetic head comprising means for supporting the back bar so that the surface of the back bar that is joined to the core is located on the same surface as the surface of the back bar that is joined to the core of the one slider half section.