JPS60182004A - Vertical magnetic recording and reproducing head - Google Patents

Abstract

PURPOSE:To prevent wear by providing a slider incorporated with an auxiliary magnetic pole, projected by a prescribed size from a face of the auxiliary magnetic pole opposing to a recording medium, in contact with the recording medium and having a lubricating operation so as to decrease the wear resistance between the both while adopting the system keeping a gap between the recording medium and the auxiliary magnetic pole. CONSTITUTION:A gap G is kept constant by providing incorporatedly the slider 9 having a sliding face 8 projected by a size (d) from a medium opposing face 7 of the auxiliary magnetic pole 3 in contact with the recording medium 2 to both sides of the auxiliary magnetic pole 3. The slider 11 is formed by a solid lubricant so as to provide lubrication and a solid impregnated with a lubricant oil such as oil-bearing metal or oil-bearing plastic is used as the solid lubricant. Since the sliding face 12 of the slider 11 having the lubrication like this contacts the recording medium 2, the wear resistance between the both is decreased and damage due to wear is prevented for the both and the service life is extended. Since a protection film is formed by the oil from the slider 11, the recording medium 2 is not damaged even if the auxiliary magnetic pole 3 contacts therewith.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to an auxiliary pole excitation type perpendicular magnetic recording/reproducing head.

Technical background of the invention and its problems FIG. 1 schematically shows the structure of an auxiliary magnetic pole-excitation type perpendicular magnetic recording/reproducing head. Main pole 1 is made of permalloy, Co -Z r -N b , Co -Z
r-Ta and Co-based amorphous thin film, high magnetic permeability and high magnetic flux density made of Sengyst, etc. 11fi tiJ
It is made of a Ji-based material, and its thickness is set to about I 11 m or less. An auxiliary magnetic pole 3 is provided to sandwich the recording medium 2. This auxiliary magnetic pole 3 is M n −Z
A single winding 4 made of a soft magnetic material such as permalloy or sendust is applied to the ferrite 1. The recording medium 2 is made by sputtering a perpendicularly magnetized film 6 on both sides of a base 5 made of a polyester film or the like. 4 by means such as
It is made up of one item.

Then, the main magnetic pole 1 and the auxiliary magnetic pole 3 are made to face each other.

By positioning the recording medium 2 between the two and exciting the Mli auxiliary magnetic pole 3 with the winding 4, recording and reproduction are facilitated by the main magnetic pole 1 brought into contact with the recording medium 2.

That is, the main magnetic pole 1 is brought into contact with the recording medium 2, but the auxiliary magnetic pole 3 is opposed to it with a gap of G. ,
This is because when the auxiliary magnetic pole 3 is in contact with the medium during the i-1 running of the recording medium 2, a concentrated magnetic field is generated at the corner of the medium facing surface 7, and this concentrated magnetic field causes the auxiliary magnetic pole 3 to There is a possibility that writing or erasing of the magnetized film 61\ or erroneous reproduction during reproduction will occur, and this will result in an erroneous signal with respect to the recording and reproduction signal by the main magnetic pole 1 of the mallet. For this reason, an air gap G is set to prevent the adverse effects of the concentrated magnetic field, and this air gap, which is 20 to 100 μIII fjjj degrees, is always maintained to prevent the auxiliary magnetic pole 3 from coming into contact with the recording medium 2. There is a need.

As shown in FIG. 2, on both sides of the auxiliary magnetic pole 3, a sliding body 9 having a sliding surface 8 that projects from the medium facing surface 7 of the auxiliary magnetic pole 3 by a distance d and contacts the recording medium 2 is integrally provided. The applicant has proposed a method in which the gap G is maintained constant by providing the gap G. Note that 10 is a main pole support. In other words, the sliding body 9 comes into contact with the recording medium 2 pushed by the main magnetic pole 1 and always maintains a constant gap between the auxiliary magnetic pole 3 and the recording medium 2.

This point will be further explained with reference to FIG. Now, the dimensions of each part will be defined as follows, and the relationships between them will be explained. First, [=total thickness d of recording medium 2: protrusion amount g of sliding surface 8 from medium facing surface 7: main magnetic pole 1
Distance S between surface and auxiliary magnetic pole 3: Recording medium 2 and auxiliary magnetic pole 3
Gap X: Amount of curvature of the recording medium 2 Q: Distance between the sliding surfaces 8, then g = L + 5 d = x 10s.

So, as an experimental example, E=75μu+'? ', Ω=
In the case of 5 mm, the contact pressure of the main magnetic pole 1 when giving a curvature of x = 50 μm is 3 g +, and when used with this contact pressure, if 5 = SOμIII, +1 = x
+ s = 50 + 50 = L OOp m, and the throat at this time is g ” L + s = 75 + 50 = + 2
5μi11.

In this state, recording and reproduction are performed on the recording medium 2, but even if the recording medium 2 is bent or wavied, the vicinity of the main magnetic pole 1 is held stably, so that the contact of the main magnetic pole 1 is stable. Also, the gap S is always kept constant.

However, in the case of this method, since the recording medium 2 and the sliding surface 8 of the sliding body 9 are constantly in contact with each other during running motion, wear between the two may cause wear and tear on one or both of the recording medium 2 and the sliding body 9. I will do it.

Purpose of invention The present invention was made in view of these points.

Adopting a gap maintenance method between the recording medium and the auxiliary magnetic pole using a sliding body in contact with the recording medium, the vertical auxiliary magnetic pole excitation type reduces wear resistance between the two to prevent wear and extend service life. The purpose is to obtain a magnetic recording/reproducing head.

Summary of the Invention The present invention provides a sliding body that has a lubricating effect and brings it into contact with the recording medium, thereby reducing the abrasion resistance between the two and allowing running motion, thereby preventing wear between the recording medium and the sliding body.
1-It is constructed so that its lifespan can be extended.

Examples of the invention An embodiment of the present invention will be described based on FIG. 4.

The same parts as those shown in FIGS. 2 and 3 are indicated using the same reference numerals. In this embodiment, a sliding body 11 having a lubricating effect is provided integrally with an auxiliary magnet ti 3, and the structure is shown in the drawing as the same as that in FIG. 2. Here, there are various ways to provide a lubricating effect, and specific examples 1 to 4 will be individually explained below.

Specific Example 1 In this specific example, the sliding body 11 is made of a fixed lubricant to provide a lubricant tlT effect. As solid lubricating materials, materials impregnated with lubricating oil during fixation, such as oil-impregnated metals and oil-impregnated plastics, are used.

Since the IP7 moving surface 12 of the IP1 moving body II, which has various lubrication effects, comes into contact with the recording medium 2, the frictional resistance between the two is reduced, preventing wear and tear on both sides, and extending the life of the IP1 moving body II. . Furthermore, the air gap between the recording medium 2 and the medium facing surface 7 of the auxiliary magnetic pole 23 is set to 100μIl+ or less, and due to the flexibility of the recording medium 2, this recording medium 2 may come into contact with the Mi auxiliary magnetic pole 3. However, according to this specific example 1, a protective film is formed by the oil from the sliding body 11, so that even if the auxiliary magnetic pole 3 comes into contact with it, the recording medium 2 will not be damaged.

Specific Example 2 In this specific example, the sliding body 11 is made of glassy carbon. This glassy carbon uses a thermosetting resin with a three-dimensional network structure as a starting material, and sets conditions such as the type and temperature of the catalyst, the temperature and time of calcination, the temperature increase rate of carbonization, and the atmosphere. When carbonized, a uniform carbon molded article (glassy carbon) with no cracks or openings can be obtained.

Generally, in magnetic recording systems, space loss between the main magnetic pole and the perpendicularly magnetized film 6 of the recording medium 2 poses a problem.

In this regard, according to Example 1, a fixed lubricant method such as oil-impregnated metal or oil-impregnated plastic is used, and since the oil contained in the sliding body 11 is applied to the recording medium 2, it is possible to record on one side of the main pole side. However, if the auxiliary magnetic pole side is also used for recording, the attached oil will cause space loss. However, if lubricity is provided by glassy carbon as in Example 2, an oil film will not be formed on the recording medium 2, the recording medium 2 will not be damaged, and there will be no problem of space loss. It is something. Therefore, it is particularly effective in double-sided recording systems.

Specific example 3 In this specific example, the sliding body 11 is made of M (ls2 (molybdenum disulfide), WS7. (tungsten disulfide), or a sintering table a containing these as main components, or C for this sintered alloy.
11 (copper), J″d (tantalum).

It is made of a self-lubricating sintered alloy sintered with W (tungsten) or the like as an additive (metallic binder) to provide a lubricating effect.

According to this, when the self-lubricating sintered alloy such as MO32 or WS2 moves in contact with the recording medium 2, a thin film of lubricant is formed on the surface of the recording medium 2. This film can protect the recording medium 2 when the auxiliary magnetic pole 3 comes into contact with any of the auxiliary magnetic poles due to the displacement of the recording medium 2 that occurs during the movement of the medium. Therefore, in a single-sided recording system, it has the effect of preventing damage to the back side of the recording medium 2 or forming a protective film. Furthermore, since wear between the recording medium 2 and the sliding body 11 is also reduced, the lifespan of both can be extended.

Specific example 4 This specific example uses crystallized glass and high hardness ceramics (
AI with non-porous or dense ceramics
20 :l, A l 20 J --ri C,'
1-i0), forsterite, non-magnetic ferrite, A1203-FezOa-Tic, SiC, SiC-
3i etc.), after molding the sliding body 11 with M
o S7! , WS2, graphite or the like is coated on the surface by thermal spraying or sputtering, vacuum evaporation, ion blating, CVD, etc. to provide a lubricating effect.

According to this specific example 4, compared to specific examples 2 and 3, the sliding body 11 is much cheaper and can exhibit its effects.

Effects of the Invention The present invention has a structure in which the auxiliary magnetic pole is provided with a sliding body that protrudes from the medium facing surface and has a lubricating effect and contacts the recording medium. The air gap can be maintained with high precision, and at this time, wear and tear between the recording medium and the sliding body can be prevented and the life of the recording medium can be extended.

[Brief explanation of drawings]

Fig. 1 is a front view showing an example of the conventional technology, Fig. 2 is a front view showing the content of the proposal already proposed by the applicant, Fig. 3 is a front view showing the main part of the same in a compressed manner, and Fig. 4 is a front view showing one example of the present invention. iT' showing an example,
It is a front view. 1...Main magnetic pole, 2. Recording medium, 3...Auxiliary magnetic pole, 7.
...Recording medium facing surface, 11...Sliding body, I2...Sliding surface Applicant: Tokyo Electric Co., Ltd.

Claims (1)

[Claims] 1. A main magnetic pole in contact with one surface of the medium and an auxiliary magnetic pole facing the opposite surface of the recording medium are provided, and integrally with the auxiliary magnetic pole, the auxiliary magnetic pole has a predetermined dimension from the recording medium facing surface of the auxiliary magnetic pole. A perpendicular magnetic recording/reproducing head characterized in that a sliding body having a lubricating effect is provided in a protruding manner and in contact with a recording medium. 2. The perpendicular magnetic recording/reproducing head according to claim 1, wherein the 2° sliding body is formed of a solid lubricant and has a lubricating effect. 3. The moving body is made of glassy carbon and is moist 11
') A perpendicular magnetic recording/reproducing head 74, a sliding body or MoO2 according to claim 1, characterized in that it has a function.
, WS2 or sintered alloys containing these as main components.
It is made of a self-lubricating alloy sintered with additives such as , 1'm, and W. The perpendicular magnetic recording/reproducing head according to claim 1, characterized in that the perpendicular magnetic recording/reproducing head has a function of 11. 5. The sliding body is formed by surface coating treatment such as thermal spraying or sputtering method, vacuum evaporation method, ion plate ink method, CVD method, etc. with MoS2, WS2, graphite, etc. on crystallized glass, high hardness ceramics, etc., and lubrication is achieved. The perpendicular magnetic recording/reproducing head according to claim 1, characterized in that the perpendicular magnetic recording/reproducing head has a function.