JPH0340278A - Floating magnetic head - Google Patents

Abstract

PURPOSE:To acquire a stable floating state and to prevent a magnetic recording medium from being damaged by forming a notched part in the termination part of a rail part and grinding the surface of the rail part with the blend work. CONSTITUTION:A notched part 2d is formed in a rail part 2 of a magnetic head 10 and a step part 2e of the notched part 2d is finished by being ground with the blend work. Namely, in order to form the notched part 2d, the termination part of a slider 1 is ground by a grinding tool such as a grindstone, etc., and further, the blend work is executed to the surface of the rail part 2 for removing the part of chipping. Since the notched part 2d is formed by grinding work in the magnetic head 10 ground in such a way, the tolerance of a dimension A' and a dimension B' become the dispersion of working accuracy itself for the grindstone. Thus, a taper surface is accurately formed and the stable floating effect of the magnetic head can be acquired without fail. Then, the magnetic recording medium is prevented from being damaged.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a floating magnetic head such as a composite type.

``Prior art j'' Conventionally, as an example of a floating magnetic head that writes and reads signals on a rotating magnetic recording medium such as a magnetic disk while floating away from the magnetic recording surface, A magnetic head I4 having the structure shown in FIG. 6 is known.

This magnetic head H has at least two parallel rail portions 2.2 on the medium facing surface of the slider 1 made of a non-magnetic material.
is formed, and a magnetic core 4 is fixed to the terminal end of the rail portion 2 using a glass bonding material. This magnetic core 4 is generally formed by combining an I-shaped core and a C-shaped core in which @line grooves are formed. Tapered surfaces 2a and 2b are formed at both ends of the rail portion 2.2, respectively.

The tapered surface 2a is intended to efficiently utilize the airflow generated on the surface portion of the magnetic recording medium as buoyancy when the magnetic recording medium rotates, and the surface portion of the rail portion 2.2 is designed to support the magnetic head H. The air bearing surface 2A is separated from the magnetic recording medium by a predetermined distance in the floating state. Further, the tapered surface 2a stabilizes the flying height of the magnetic head H with respect to the magnetic recording medium, prevents the magnetic gap from approaching the magnetic recording medium during flying, and when the magnetic recording medium starts or stops rotating. When stopping,
This is provided for the purpose of preventing damage to the magnetic recording medium at the end of the slider l.

"Problem to be Solved by the Invention" FIG. 7 is an enlarged view of the surrounding area of the tapered surface 2b. In FIG. 7, the triangular portion indicated by diagonal lines indicates the portion of the slider l which has been partially polished and removed to form the tapered surface 2b, and B indicates its maximum depth dimension. Also, the gear G shown in FIG. 5 is located below the part indicated by arrow g in FIG. 7, and the dimension from this part indicated by arrow g to the end of the tapered surface 2b is indicated by A. .

Incidentally, at present, the taper angle of the tapered surface 2b of a general floating magnetic head is defined to be around 108 degrees. In this type of floating magnetic head, in order to reduce the variation in flying characteristics at the gear part G, it is necessary to reduce the tolerance of the dimension A mentioned above, and furthermore, in order to make the slider l thinner, Although it is preferable to make the above-mentioned dimension B as small as possible (B=0, 1 mm or less), the conventional structure has limitations due to the following reasons.

■The tolerance of dimension A is (tolerance of dimension A) - (polishing tolerance D) / (sin I
Since there is a relationship as follows, the polishing tolerance is 5.7 times greater than the polishing tolerance. The polishing tolerance is currently ±10~2.
Since the limit is approximately 0 μm, it becomes difficult to reduce the tolerance of the dimension A to ±0.05 mm or less.

■To reduce dimension B, as shown in Figure 8, B=
Since there is a relationship of ``CtanlO'', the taper angle is set to 10''.
It is better to make it smaller, but if you make the taper angle smaller,
Since the tolerance of dimension A is [1/5 inch (taper angle)], there is a problem that the tolerance of dimension A increases.Therefore, in the structure of the conventional magnetic head H described above, B
The limit was approximately 0.15 mm.

On the other hand, when the tapered surface 2b is formed by grinding, uneven chipping occurs along the boundary line between the air bearing surface 2A and the tapered surface 2b, which adversely affects the flying characteristics of the magnetic head H. There is.

The present invention has been made to solve the above problems, and by forming a notch at the end of the rail part, a stable floating state can be obtained, and the magnetic recording medium will not be damaged. It is an object of the present invention to provide a floating magnetic head in which chipping does not occur at the stepped portion of a notch.

"Means for Solving the Problems" In order to solve the problems described above, the present invention provides a slider by providing a rail portion on the surface facing the magnetic recording medium, and fixing a magnetic core to the terminal end side of the surface of the rail portion. In the floating magnetic head, a notch is formed at the end of the rail, and the surface of the rail is polished by blending.

``Function'' A notch formed at the end of a portion of the slider allows the magnetic head to float stably. Further, by polishing the surface of the rail portion by blending, the stepped portion of the cutout portion can be polished, so that chipping at this stepped portion is removed and the floating state of the magnetic head is stabilized.

1 Embodiment" Figures 1 and 2 show an embodiment in which the present invention is applied to a mini-combo knot type floating magnetic head. The magnetic head 1o of this embodiment is different from the conventional one described above. Since the structure is almost the same as that of the magnetic head H, the same components as those of the conventional magnetic head H are given the same reference numerals, and their explanation will be omitted.

The magnetic head 10 of this embodiment differs from the conventional magnetic head H in the structure of the terminal end of the rail section 2. In this embodiment, the conventional tapered surface 2
A notch 2d is formed in place of b, and a stepped portion 2e of the notch 2d is polished and finished by blending.

The notch 2d is formed by grinding the end of the slider l with a grinding tool such as a grindstone. When this grinding process is performed to form the notch 2d at the end of the rail portion 2, irregular uneven chippings T occur at the stepped portion of the notch 2d, as shown in FIG. After the cutout portion 2d having a predetermined depth and a predetermined width is formed by the grinding process, a blending process is performed on the surface of the rail portion 2 (air bearing surface 2A) in order to remove the chipped portion.

To perform the blending process, place it on top of an elastic material such as rubber.
A finishing table (polishing tape) is placed, and the rail portion 2 of the slider 1 is pressed against the finishing table and polished by moving in a direction perpendicular to the rail portion 2.

In this step, the rail portion 2 pressed against the elastic body
is ground more at the ends, so the rail portion 20
As shown in FIG. 1, the corners of the polished portions of both ends are curved, and the chipping T at the stepped portion 2e of the notch 2 is removed at the end of the rail wk2. As described above, the chipping T can be removed by simply pressing it against the finishing tape and polishing it.

In the magnetic head 10 polished in this way, the notch 2d is formed by the grinding process, so the dimension A shown in FIG.
The tolerance o and the dimension Bo result in variations in the processing accuracy of the grindstone itself. Therefore, by adopting the above structure, the dimension Ao
The tolerance can be reduced to ±0.03 ma+, about half of the conventional value, allowing highly accurate processing. Further, the dimension Bo can be set to 0.05 mm, and the thickness is 0.05 mm.
It can also be used with thin sliders of 5 to 1 mm.

In the above embodiments, an embodiment in which the present invention is applied to a mini-composite type floating magnetic head has been described, but the present invention can also be applied to magnetic heads of other structures such as a two-rail type mini-monolithic type floating magnetic head. Of course, it can be applied to

"Effects of the Invention" As explained above, in the present invention, a notch is formed at the end of the rail section in place of the conventional tapered surface, so that the magnetic head can stably float relative to the magnetic recording medium using this notch. without causing damage to the magnetic recording medium. In addition, when forming a notch, the position and depth of the notch directly correspond to the machining accuracy value of the notch, so it can be formed with higher precision than when forming a conventional tapered surface. The stable flying effect of the magnetic head can be ensured. Further, since the notch can be formed shallowly with high precision, it is easy to apply to a thin slider with a thickness of about 0.5 to 1 ml, and there is an effect that it can respond to thinning of magnetic heads.

[Brief explanation of drawings]

1 and 2 show an embodiment of the magnetic head of the present invention, FIG. 1 is a bottom view, FIG. 2 is an enlarged end view, and FIGS. 3 and 4 are views of the magnetic head. It shows the state before blending processing. Figure 3 is a bottom view, Figure 4 is a side view, Figures 5 to 7 are for explaining the conventional magnetic head, and Figure 5 is a bottom view. , FIG. 6 is a side view, FIG. 7 is an enlarged view of the end, and FIG. 8 is an explanatory view of a cut portion. 2...Rail part, 2A...Slider surface, 2a, 2
b-,...Tapered surface, 2d...Notch, 2e...Step, 4...Magnetic core, G...Gap, T...Chipping.

Claims (1)

[Scope of Claims] A floating magnetic head comprising a slider provided with a rail portion on a surface facing a magnetic recording medium, and a magnetic core fixed to a terminal end side of the surface of the rail portion, comprising: a terminal end of the rail portion; A notch is formed in the part, and
A floating magnetic head characterized by the rail surface being polished by blending.