JPH03198208A - Magnetic head for fdd - Google Patents

Abstract

PURPOSE:To hardly generate a spacing between a medium and a magnetic gap and to obtain a stable sliding state by tightening sliders provided with grooves in leg parts by sealing members, thereby curving the sliding contact surfaces to a projecting shape. CONSTITUTION:The groove parts 15 having a prescribed depth, width and number are formed in the leg parts of a pair of the sliders 13, 14 which crimp both side faces of a core chip 11 formed with a magnetic gap (g), by which the strength of the sliders 13, 14 is degraded. The leg parts of the sliders are tightened in the traveling direction of a medium by the spring claws 16a of shielding materials 16, by which the projecting curved surfaces of about several Angstrom are formed on the surfaces for sliding contact with the medium. As a result, the spacing is hardly generated between the recording medium and the magnetic gap (g) and the sliding state is stabilized, by which the recording and reproducing are stably executed. The contact of the edge parts of the curved surfaces with the recording medium is substantially prevented and the flawing of the medium is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head for FDD, and more particularly to the formation of a sliding contact surface that achieves stability during sliding contact with a medium.

Traditionally, magnetic heads used in FDD devices have a pair of cores la and lb made of ferromagnetic material such as ferrite, and a metal magnetic material such as sendust on the joint surface, as shown in Figures 5 to 7. After depositing a film (not shown), they are joined together via a non-magnetic film of 5in2 or the like serving as a gap spacer to form a magnetic gap g on the top end surface of the core la.

An inverted-shaped slider 3.4 made of a non-magnetic material such as ceramic is attached to both sides of the core chip 2, which is integrally bonded with the core chip 1b. After polishing to the desired gap depth, the slider edge part is polished using a lapping machine, etc. Polishing is performed on the R surface P.
1. P2 is formed.

A coil bobbin (not shown) in which a wire is wound around the bobbin is inserted into the leg of the core chip 2, and a back core 5 made of a ferromagnetic material such as ferrite is bridged between the legs to form a closed magnetic path. After that, the gimbal 8 is attached to the lower surface of the slider 3.4.

Furthermore, a ring-shaped shielding material 9 made of a ferromagnetic material such as permalloy is attached to cover the side surface of the Herad slider.

The top end surface of the core chip 2 and the top end surfaces of the sliders 3 and 4 are on the same plane, forming a flat medium sliding contact surface 6. Air vent grooves 7 are formed in the medium sliding contact surface 6 along the running direction of the magnetic recording medium, and these air vent grooves 7 stabilize the running state of the medium with respect to the magnetic gap g of the core chip 2.

Incidentally, in the magnetic head 1 described above, the medium sliding contact surface 6 formed by the top end surface of the core chip 2 and the top surface of each slider 3, 4 is smooth and flat. Moreover, since the magnetic gap g is located approximately at the center of the medium sliding contact surface 6, the recording medium slides into sliding contact with the sliding contact surface 6, indicating the arrow A.
When sliding in the sliding direction, spacing tends to occur between the recording medium and the magnetic gap g (therefore, there was a problem that stable recording and reproduction could not be performed).

Moreover, when the above-mentioned spacing occurs, the magnetic head 1 fixed to the gimbal spring tilts along the sliding direction A, causing the edge portion P1 . Although P2 had a slight curvature, it easily came into contact with the recording medium and scratched the surface of the medium.

The present invention comprises a core chip with a magnetic gap formed on the top surface and a pair of sliders sandwiching both sides of the core chip, and each leg of the pair of sliders has a magnetic gap along a direction perpendicular to the sliding direction. Grooves with a predetermined depth, width, and number are provided to reduce the strength of the slider in the sliding direction, and a structure is provided in which the slider is tightened by a shield material that covers the legs of the slider, thereby reducing the sliding contact of the slider. It is characterized in that the surface is curved into a convex curve in the medium running direction.

A assembled surface can be formed, and spacing between the magnetic gap medium and the magnetic gap medium can be made less likely to occur.

Hereinafter, one embodiment of forming a curved surface of a medium sliding surface according to the present invention will be described with reference to FIGS. 1 to 4.

In the magnetic head shown in FIGS. 1 and 2, a pair of sliders 13 and 14 sandwich both sides of the core chip 11.
A groove 15 is formed along a direction perpendicular to the medium running direction (arrow in the figure).

The slider 13 is attached to the leg portion of the slider 13, 14 by a spring-like claw 18a of the shield member 16 so that the slider 13 is moved in the medium running direction.
．． 14, the medium sliding surface becomes a convex curved surface of several thousand degrees.

In manufacturing the above magnetic head, first, as shown in FIG.
Concave grooves 15 of a predetermined depth, width, and number are provided in each leg of the pair of sliders 13 and 14 in a direction perpendicular to the medium running direction in advance to reduce the slider strength in the medium running direction, and to reduce the strength of the slider in the medium running direction. In addition to sandwiching the surfaces, the top surfaces of the slider 13, 14 and the core chip 11 are formed into smooth flat surfaces. Thereafter, by covering the legs of the sliders 13 and 14 with shielding material 16 made of ferromagnetic metal such as permalloy whose inner surface in the medium running direction has a spring-like claw structure, the sliders 13 and 14 and the core chip 11 are The medium sliding contact surface has a convexly curved surface shape.

After that, a coil bobbin (not shown) in which a wire is wound around a bobbin is inserted into the leg part of the core chip 11, and a back core 12c made of a ferromagnetic material such as ferrite is bridged between the leg parts to form a closed magnetic circuit. Form. Next, slider 13°14
The curved surface in the medium running direction is maintained by applying adhesive to the bottom surface and fixing it to the gimbal 18 with adhesive.

Actual temperature■11 In addition, the spring-like claw structure lea shown in Figures 1 and 2
Instead of the shielding material 16, a ring-shaped shielding material made of a shape memory alloy may be used, or the surface of the ring-shaped shielding material may be covered with heat shrink tape and then heated to shrink it, and the slider may be tightened. It is also possible to form a convex curved surface shape on the medium sliding contact surface.

According to the present invention, in a magnetic head having a magnetic core sandwiched between a pair of sliders, the medium sliding contact surface is curved convexly along the sliding direction, and the magnetic gap is formed into a curved surface. By positioning it at the top of the curve, the sliding condition with the recording medium is stable, and recording and playback can be performed stably. Furthermore, the edges of the curved surface are less likely to come into contact with the recording medium, preventing scratches on the recording medium. becomes difficult to stick to.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the magnetic head according to the present invention, FIG. 2 is a side view including a partial cross section of FIG. 1, and FIGS. FIG. 3 is a perspective view for explanation. FIG. 5 is a perspective view showing a conventional example of a magnetic head for an FDD device, FIG. 6 is a front view of FIG. 5, and a side view including a partial cross section of FIG. 11...Core chip, 12a, 12b...Core, 13.14...Slider, 15...Concave groove, 16...Shield material , 16a...Spring-like claw, 17...Medium sliding contact surface. Figure 7 is Figure 7

Claims (1)

[Claims] It comprises a core chip in which a pair of cores made of ferromagnetic material are joined and integrated to form a magnetic gap on the top end surface thereof, and a pair of sliders that sandwich both side surfaces of the core chip, and the pair of sliders have a magnetic gap on each leg. A structure in which grooves of a predetermined depth, width, and number are provided along a direction perpendicular to the sliding direction to reduce the strength of the slider in the sliding direction, and the slider is tightened by a shield material that covers the legs of the slider. A magnetic head for an FDD, characterized in that the sliding surface of the slider is curved into a convex curved surface in the medium running direction.