JPH0640369B2 - Magnetic head - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head used when recording or reproducing information on a magnetic disk.

2. Description of the Related Art In recent years, magnetic storage devices such as floppy disk devices have been widely used as external storage devices for computers, but there is an increasing demand for miniaturization and high density. In order to meet this demand, the height is limited in terms of dimensions, and in terms of magnetic efficiency, high efficiency has been demanded. As an effective means of increasing the magnetic efficiency, it is conceivable to reduce the magnetic resistance of the core part.

The magnetic resistance R is given by R = / μS. Here, 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 and the shorter the magnetic path length, the smaller the magnetic resistance. Therefore, in order to reduce the magnetic resistance of the core portion, the total height of the core should be as small as possible.

The conventional magnetic head will be described below.

FIG. 5 is a side view of the first example of the conventional magnetic head, and FIG. 6 is a side view of the 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.

Problems to be Solved by the Invention Here, the back bar 2 is adhered to the foot portion of the core 5 with a resin. In the example of FIG. 5, the coil 3 is arranged outside the slider 1 via the gimbal 4. The attachment position of the back bar 2 is outside the coil 3, and the core 5
The total height L is the height of the slider 1 + the height of the coil 3 + the thickness of the gimbal + the width of the back bar 2, which is considerably high.

The example in FIG. 6 is a type in which the coil 3 is dropped in the width of the slider 1. Compared to the first example, the total height L ′ of the core 5 is reduced by the amount that the coil 3 is dropped to the width of the slider 1, but
In order to mount the back bar 2 on the core 5, the total height L'needs to be larger than the height of the slider 1.

The present invention solves the above-mentioned conventional problems, and provides a method for improving the efficiency of the head by shortening the magnetic path length of the core.

Means for Solving the Problems According to the present invention, a back bar is housed in a portion of one of a pair of slider half sections facing a core of one slider half section, and a facing surface facing a sliding surface with a medium is formed. As described above, a concave portion is provided.

Action Since the back bar does not occupy more space than the space occupied by the slider, the overall height can be greatly reduced.

Example One example of the present invention will be described below.

FIG. 1 is a perspective view for explaining the order of assembling the slider assembly, and FIG. 2 is a side view of the completed slider assembly. In the figure, 1a and 1b are slider half sections, and a back bar 2 is a slider half section 1.
It is adhered to the slider half section 1a so as to fit into the recessed portion 1a 'provided in a, and the back bar 2, the slider half section 1a and the core 5 are finished to be flush with each other. In this way, the back bar 2 and the slider half section 1a are integrated with each other to be bonded to the core 5 and the slider half section 1b to form a slider assembly. After that, the coil 3 is wound around the back bar 2 to complete the magnetic head. In this embodiment, when the recessed portion 1a 'is provided in the slider half section 1a, by forming the facing surface 6 facing the sliding surface 7 for the medium, the back bar 2 is brought into contact with the facing surface 6 to form the recessed portion. 1a 'can be securely held, the back bar 2 and the slider half section 1a are easily joined, and the productivity is improved.

In this embodiment, the total height of the core is L ″, and the total height of the core can be greatly reduced as compared with the conventional one. As a result, the magnetic path length of the core can be shortened and the magnetic efficiency can be improved. .

FIGS. 3 and 4 show another embodiment of the present invention in which a slider half section 1a is provided with a recessed portion 1a ″ having a step with respect to the joint surface with the core 5, and the other portions are shown in FIG. The configuration is similar to that of Embodiment 1. By providing the concave portion 1a ″ on the joint surface of the slider half section 1a with the core 5, the adhesive area between the back bar 2, the slider half section 1a and the core 5 is reduced, and at the time of assembly. Back bar 2 and core 5,
It can bond more effectively.

EFFECTS OF THE INVENTION As described above, according to the present invention, the back bar is housed in the facing portion of one slider half section of the pair of slider half sections with the core, and the facing surface that faces the sliding surface with the medium. Since the recess is formed so that the back bar is not necessary, the overall height of the head can be greatly reduced and the overall height of the core can be reduced, and the magnetic efficiency can be improved. Can be made.
Further, since the back bar can be easily fixed by providing the facing surface that faces the sliding surface with respect to the medium when the recess is provided, the productivity is improved.

[Brief description of drawings]

1 is an exploded perspective view of a magnetic head in one embodiment of the present invention, FIG. 2 is a side view of the same, FIG. 3 is an exploded perspective view of another embodiment of the present invention, and FIG. 5 and 6 are side views of a conventional magnetic head. 1a, 1b ... Slider half-division, 2 ... Back bar,
5 ... Core, 6 ... Opposing surface, 7 ... Sliding surface.

Claims (1)

[Claims] 1. A magnetic head comprising a pair of slider halves, a core sandwiched between the pair of slider halves, and a back bar joined to the core, the pair of slider halves. A magnetic head characterized in that a back bar is housed in a portion of one of the slider half sections facing the core, and a recess is provided so as to form a facing surface facing the sliding surface with the medium. .