JPH01277308A - Grooved magnetic head - Google Patents

Abstract

PURPOSE:To obtain a magnetic head with dust removing grooves appropriate also for an economical narrow gap ring type by forming X-shaped grooves on the front part of a magnetic gap part on the medium sliding face of a soft magnetic material head core. CONSTITUTION:The X-shaped grooves 14 are formed on the front part in the magnetic head sliding direction of the gap part 2 for recording/reproducing the magnetic head sliding face. The width of the X-shaped grooves is several tens - several 100mum and the depth is 0 - several mum in a far part from the magnetic gap 2 or 10 - several tens mum in a near part and an angle formed by the two grooves is set up in accordance with the shape of a boundary line to which dust is stuck. Since the grooves are formed so as to be deepened in accordance with approach to the magnetic gap abutting part 2 of the head core blocks, an easily formed and economical magnetic head appropriated also for the narrow gap ring type can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head used for recording and reproducing a flexible magnetic recording medium.

[Contents and problems of conventional technology]

Flexible magnetic recording media are made of magnetic metals such as Fe, Go, Ni, or their ferromagnetic oxide fine particles.
There are two types: those that use a coating medium that is mixed with a binder and coated on a film of resin, etc., and those that use a thin film medium that directly forms a magnetic recording layer of a magnetic thin film by methods such as plating, vapor deposition, and sputtering. . Coated media have advantages such as good mass production, low cost, and high reliability, but on the other hand, the ratio of magnetic material per unit volume of the recording layer is small, which is disadvantageous for increasing recording density. Thin-film media are suitable for high-density recording because the recording layer is almost entirely made of magnetic material, but there are problems with durability due to large friction and wear caused by sliding between the magnetic head and the metal film.

Typical magnetic heads used for flexible recording media are shown in FIGS. 9 and 10. Fig. 9 shows a ring-type magnetic head for longitudinal and perpendicular magnetic recording, and Fig. 10 shows a main pole excitation type single-pole head for perpendicular magnetic recording. is a spherical surface (or R surface).

When these magnetic heads and recording media are allowed to slide for long periods of time, the magnetic material and protective film adhering to the surface of the recording medium, abrasion particles of the head slider material, dust in the atmosphere, etc. may come into contact with the magnetic head. If it exceeds its limit, it may enter the contact area, deteriorating the recording/reproducing characteristics or causing scratches on the magnetic head or medium. As a means to solve this problem, a 7-shaped base point is installed at the front of the gap where recording and reproduction is performed, along the boundary line of the accumulation of dust that adheres to the sliding surface of the magnetic head when the recording medium runs. A head with a V-groove as shown in FIG. 5 was devised, in which a groove is provided to face the head of the magnetic head, and dust deposits are removed along the groove before they grow on the magnetic head.

Conventionally, in the production of grooved heads, ■ Figures 6 to 8 are used to form one head core block having grooves.
As shown in the figure, a rectangular ferrite block had a structure in which grooves were formed in advance.

That is, grooves of a predetermined size and shape are machined on the head core block, and after cutting, the grooves are alternately overlapped and glued so that they form a figure 7 shape.
This is again considered as one core block. However, this method has the disadvantage that it tends to be costly due to misalignment of the apex portion, wasted material, and increased processing man-hours.

In addition, in the case of a ring type head in which a V-groove is formed by the procedure shown in FIGS. 6 to 8, another gap 17 is formed perpendicular to the magnetic gap for recording and reproducing signals, as shown in FIG. However, there was a drawback in that the recording and reproducing characteristics were affected, especially in narrow gaps.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art, and to provide a magnetic head with grooves for removing dust, which is easy and economical to manufacture and is suitable for a narrow gap ring type magnetic head.

[Structure of the invention]

The present invention provides an X-shaped groove as shown in FIG. 1 at the front of the sliding direction of the magnetic head in the gap where recording and reproduction is performed on the sliding surface of the magnetic head, as a groove for removing dust corresponding to a V-groove. In the magnetic head of the present invention, there is no joint that acts as a magnetic gap in the running direction of the magnetic head in the conventional V-groove portion, and the newly formed X portion is originally connected to the recording medium. Although it is not in contact with the material, even if it is in contact, the surface pressure remains very small, so there is no problem with sliding, and compared to conventional methods, processing is easier and requires fewer man-hours, and the need for cutting and polishing the material is minimized. It has the characteristic of being able to That is, in a magnetic head constructed by abutting two soft magnetic material head cores, the present invention includes forming an X-shaped groove in the front part of the magnetic gap on the medium sliding surface of the soft magnetic material head cores. This is a characteristic grooved magnetic head.

[Explanation based on examples]

Examples of the present invention will be described below.

FIG. 1 is an external perspective view of an X-groove ring type magnetic head in one embodiment of the present invention. The width of the X groove 14 is several tens to several hundreds of μm, and the depth is 0 at the part far from the magnetic gap 2.
It is from 10 to several 10 μm in the vicinity, and the angle θ between the two grooves is set in accordance with the shape of the boundary line to which dust adheres. In the manufacturing process, as shown in Figure 2, the angle δ (δ = tan) corresponding to the difference in the depth of the X groove is
-'b/a, a: core width, b: difference in groove depth), the magnetic core block is tilted, and the groove is machined so that the processing grindstone cuts at an angle of θ/2. After that, the core block was tilted in the opposite direction to form an X groove and winding grooves were processed, as shown in FIG.

Furthermore, as shown in FIG. 4, the magnetic head shown in FIG. 1 is obtained by butting the core block with the other core block that does not have an X-groove and joining it together, cutting it along the broken line in the figure, and polishing the sliding surface. .

〔Effect of the invention〕

As described above, according to the present invention, the dust removal groove of the magnetic head is formed into an X-shape, and is formed so that it becomes deeper as it approaches the magnetic gap abutting portion of the head core block, thereby making it easy to manufacture and economical. Moreover, it has become possible to provide a magnetic head with dust removal grooves suitable for narrow-gap ring-type magnetic heads.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an X-groove ring type magnetic head manufactured by the method according to the present invention. FIG. 2 is a perspective view showing an example of a grooving method. FIG. 3 is a perspective view of a core block in which winding grooves have been processed after forming X grooves. FIG. 4 is a perspective view of the core blocks facing each other and being joined and integrated. FIG. 5 is a perspective view showing a ring-type head. FIG. 6 is a perspective view showing a main pole excitation type single magnetic pole head for perpendicular magnetic recording. FIG. 7 is a perspective view showing a grooved ring type head. FIG. 8 is a perspective view of a core block showing an example of the conventional groove forming method. FIG. 9 shows 10a after cutting the core block shown in FIG. 4. 10b is a perspective view of the layers 10b being alternately stacked and bonded together. FIG. 10 is a perspective view of a core block in which winding grooves have been processed. Below margin ← mark: magnetic recording medium running direction. 1.5... Ferrite core. 2...Magnetic gap. 3...Nonmagnetic reinforcing material. 4.8...Coil winding. 6...Non-magnetic slider. 7...Main magnetic pole. 9.12...■ Groove. 10a, 10b, 11.13a, 13b...-near 7 blocks. 15, 17.19a, 19b... Core block. 14, 18...X groove. 16...Whetstone. 17...Void. Patent applicant: Tohoku Metal Industry Co., Ltd. Figure 7 Figure 8 Figure 9 Figure 70

Claims (1)

[Claims] In a magnetic head constructed by abutting two soft magnetic material head cores, an X-shaped groove is formed in the front part of the magnetic gap on the medium sliding surface of the soft magnetic material head core. magnetic head.