JPH0448412A - Magnetic head - Google Patents

Abstract

PURPOSE:To lessen the deterioration in magnetic recording and reproducing characteristics by forming high-hardness thin films on the magnetic recording medium-sliding surface of a case as well as the resin part of an aperture and the front end of a magnetic core. CONSTITUTION:The TiN film 8 which is the high-hardness thin film is formed at about 5mum by ion plating only on the part 1a of the case. The front end 3a which is the part of the magnetic core 3 is disposed to face the aperture 2 of this case 1 and is fixed by an epoxy resin 7 which is a resin. The sliding surface is thereafter ground by cylindrical grinding and the TiN film 8 provided in the part 1a of the case exclusive of about 4mum film 8b is finished to the sliding surface. The head which is this magnetic head is then formed by forming the TiN film 8a over the entire part of the medium-sliding surface 11 over the front end 3a of the magnetic core, the part 7a of the resin and the part 1a of the case. The deterioration in magnetic recording and reproducing characteristics is lessened in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic head, and particularly to a magnetic head that magnetically records or reproduces information by moving a magnetic recording medium relative to a magnetic core.

[Conventional technology]

Conventionally, as this type of magnetic head, those shown in FIGS. 6 to 11 are known. FIG. 6 is a perspective view showing a magnetic head for a magnetic cart reader that records information on a magnetic cart, which is a magnetic recording medium, and reproduces recorded information, and FIG. 7 is a sectional view thereof. The basic structure of this magnetic head is similar to other sound-guiding magnetic heads.

In the figure, reference numeral 1 denotes a case of a magnetic head, and a magnetic core 3 is fitted into the case 1 along with other magnetic head constituent members. 2 is the center of the surface on the near side in FIG. 6 that constitutes the magnetic recording medium sliding surface of the portion 1a of the case 1 among the entire sliding surface of the magnetic recording medium on which the magnetic cart slides during recording and reproduction of the information. an opening formed in the opening 2, and a tip 3a which is a part of the magnetic core 3 with a magnetic gap 4 provided in this opening 2.
By casting the resin 4 on the case 1 while facing the
It had a structure in which the magnetic core 3 was fixed inside the case 1.

In this conventional example, a case where the resin is an organic resin such as an epoxy resin will be explained. 9 is a bobbin, and 10 is a terminal.

In such a magnetic head (hereinafter referred to as "head") for a magnetic card reader, wear of the medium sliding surface 11 is particularly problematic due to sliding with the magnetic recording medium. In order to prevent this wear, the magnetic core 3 is formed using a magnetic material such as Centast which has excellent wear resistance, and the end 5 of the opening 2 is Sendust on the part.

A block 6 made of ferrite, ceramic, etc. with excellent wear resistance is embedded to provide wear resistance, and as shown in FIG. TiN.

SiC, TiC, SiN, etc.) formed by vacuum thin film forming techniques such as ion blating have been used.

[Problem to be solved by the invention]

However, the above conventional example has the following drawbacks.

Using a head that uses Sendust for the magnetic core 2 and Permalloy for the case 1, (a) a head without any countermeasures, (
(b) Sendust block embedded, (c) Ceramic block embedded, (d) TiN 1μ
FIG. 11 shows a graph of the amount of wear of the magnetic core when the cart was run and reciprocated 1,000,000 times for four types of heads with M films formed thereon.

When these were arranged in descending order of wear amount, they were (d), (c), (b), and (a), and the bed in (d) on which a 1 μm thick TiN film was formed had the best wear resistance. However, regarding the head (d), the medium sliding surface 11 is
When measured using a roughness meter from the surface in the measurement direction shown in Figure 2, the first sliding surface is compared to the initial sliding surface shown in Figure 15.
As shown in Figures 3 and 14, part 1a of the case is worn out, and part 3a of the magnetic core is hard to wear, resulting in uneven wear and causing damage to the magnetic cart. It turns out. Regarding (b) and (c), this kind of thing is rare and the wear is uniform, but the amount of wear is greater than (d). Abrasion resistance is also affected by the hardness of the base, and the case part 1a is made of permalloy, and the magnetic core 3 is made of permalloy.
Part 3a is made of sendust, so there is a 1 μm thick layer on top of it.
Even if a hard TiN film is attached, it seems that the results will be similar to those in the experiment. Although it is desirable to increase the thickness of the film, there is a problem in that if a thick film is applied near the gap 4, the magnetic recording and reproducing characteristics deteriorate due to spacing loss.

The wear-resistant magnetic head of the present invention was developed to solve this problem, and has a magnetic recording medium sliding surface of the case of 3 to 10 μm on the case part, and a magnetic core part and resin part on the case part of the magnetic recording medium sliding surface. By forming a highly hard thin film of 1 to 3 μm, the magnetic head has wear resistance, allowing magnetic recording and recording without causing scratches on the card due to uneven wear.
It is an object of the present invention to provide a magnetic head that can reduce deterioration of reproduction characteristics.

The high hardness thin film is TiN or TiC.

Among SiN, SiC, Affi203 and SiO2,
Preferably, it is made of just one material.

(Means for solving JN) Therefore, in the magnetic core of the present invention, a magnetic core made of a wear-resistant magnetic material is fitted into a case together with other magnetic head components, and the magnetic core of the present invention is The tip of the magnetic core is exposed to the opening formed in the surface that constitutes the sliding surface of the magnetic recording medium, and the magnetic head of the case is heated by casting resin on the case and fixing the magnetic core. 3 to 10μ on the recording medium sliding surface
m, the resin part of the opening and the tip of the magnetic core are 1 to 3 μm
The high hardness vI crotch is formed into a film.

-tt, -C1 The high hardness wI film is TiN or TiC.

Preferably, the material is made of one of SiN, SiC, Al2O3, and SiO2.

[Effect]

The wear-resistant magnetic head configured as described above has a highly hard thin film of 3 to 10 μm thick formed on the case portion of the sliding surface of the magnetic recording medium, and a highly hard thin film of 1 to 3 μm thick formed on the magnetic core portion and the resin portion. As a result, the magnetic head has good wear resistance, does not cause damage to the cart due to uneven wear, and works to minimize deterioration of magnetic recording and reproducing characteristics.

For the above reasons, high hardness thin films are made of TiN, T
It is effective to use one of iC, SiN, SiC, A1203, and SiO2.

〔Example〕

A first embodiment of the present invention will be described below based on the drawings.

Fig. 1 is a cross-sectional view showing a wear-resistant magnetic head according to the first embodiment of the present invention, Fig. 2 is a side view of the same, and Fig. 3 is a wear test using the same surface roughness meter after 1 million reciprocations. FIG. 4 is a cross-sectional view showing the initial shape of the sliding portion of the head.

The same or equivalent parts as in the conventional example FIGS. 6 to 15 are indicated by the same reference numerals to avoid duplication of explanation.

First Example (i) A TiN film 8, which is a highly hard i-film, is formed to a thickness of approximately 5 μm only on the portion 1a of the case by ion blasting.

(ii) The tip 3a of the magnetic core 3 is exposed to the opening 2 of the case 1, and the epoxy resin 7 is made of resin.
Fix it by. Thereafter, the sliding surface is ground by cylindrical grinding, and the TiN film 8 provided on the part 1a of the case is finished by leaving a film 8b of about 4 μm thick.

(iii) Next, in this magnetic head, the TiN film 8a is coated over the tip 3a of the magnetic core, the resin portion 7a, and the case portion 1a by ion blasting. By forming a film of 1 μm over the entire surface of the medium sliding surface 11, a head having the structure shown in FIG. 1 is completed.

The head made in this manner was subjected to a cart running test as described above, and the head was run back and forth 1 million times, and the wear amount of the magnetic core portion and the shape of the media sliding surface in the direction parallel to the gap 4 were measured using a surface roughness meter. As shown in Fig. 3, the measurements showed that only part 1a of the case wore out, and no uneven wear occurred, and compared to the initial sliding shape shown in Fig. 4. As can be seen, the results showed that the wear was extremely small.

Further, the thickness of the high hardness thin film 8 formed on the case portion 1a must be at least 3 μm because if it is less than 3 μm, it will not be able to reinforce the weakness of the base which is not highly hard.

If the thickness exceeds 10 μm, the total stress will increase, the adhesion between the case portion 1a and the membrane 8 will decrease, and the membrane will peel off, so a range of 3 to 10 μm is desirable.

Furthermore, if the thickness of the film formed on the portion 3a of the magnetic core near the gap 4 is less than 1 μm, the wear resistance effect will not be obtained.On the other hand, if the film thickness exceeds 3 μm, spacing loss will cause magnetic recording. The playback characteristics will deteriorate.

Furthermore, resin 7. Because parts with weak heat resistance, such as bobbins and coils, are used, the temperature rises as the film is formed, resulting in uneven caps due to thermal deformation of the resin 7, resulting in deterioration of characteristics, disconnection, etc. This results in an inconvenient result.

Therefore, in the portion of the magnetic core 3 near the cap g, 1
It is necessary to form a film with a thickness of ~3 μm.

For the above reasons, as shown in Table 1, the media sliding surface 1
It is understood that a NiT film 8 of 3 to 10 μm was formed on the portion 1a of the case 1, and a NiT film 8 of 1 to 3 μm was formed on the tip 3a of the magnetic core and the resin portion 7a, as explained above in Table 1. According to the wear-resistant magnetic head of the first embodiment of the present invention, the magnetic core 3 made of a wear-resistant magnetic material is combined with other magnetic head constituent materials such as the bobbin 9 and the terminals. The tip 3a of the magnetic core is fitted into the case 1 together with other members, and the tip 3a of the magnetic core is exposed to the opening 2 formed in the surface that constitutes the head sliding surface of the case 1, and the magnetic core 3 is fixed by injecting epoxy resin 7. A magnetic head consisting of a magnetic head, in which a TiN film, which is a highly hard thin film of 3 to 10 μm, is formed on the case portion 1a of the head sliding surface S.
The head has good wear resistance, does not cause damage to the cart due to uneven wear, and has the effect of minimizing deterioration of magnetic recording and reproducing characteristics (1 dB or less).

Second Embodiment Preface 6 In the first embodiment, we have explained the case where a TiN film is formed on the head.
It is also possible to form a film. (Not shown) The lack of hardness of the base can be solved by embedding blocks, and a thin film with high hardness can be uniformly provided.

Third Embodiment As shown in FIG. 6, a TiN film of 4 μm is formed by ion blasting on the shaded area of the media sliding surface of case 1 out of the entire surface of the created media sliding surface 11. . The method used at this time is to apply a heat-resistant film made of polyimide resin to the area other than the shaded area for masking.

Next, once removed from the film forming apparatus, which film is peeled off and a 1 μm thick TiN film is formed on the entire surface, the sliding surface will be slightly uneven compared to the first example, but the card will not run smoothly. There is no problem.

The head made by the method of this third embodiment has TiN of 54Im in the case part 1a and TiN in the core 3 part 3a.
The structure is similar to that of the head according to the first embodiment, with a thickness of 1 μm.

Fourth example The high hardness thin film is TiN, TiC, or SiN.

It may be made of any one of SiC, A1203, and Sin.

〔Effect of the invention〕

As described above, according to the magnetic head of the present invention, the magnetic core, together with other magnetic head structural members,
Fitted into the case, the tip of the magnetic core is exposed to the opening formed in the surface that constitutes the magnetic recording/reproducing sliding surface of the case.
A magnetic head in which a magnetic core is fixed by casting a resin in a case, and the magnetic recording medium sliding surface of the case has 3 to 1
By forming a highly hard thin film of 0 μm and 1 to 3 μm on the resin part of the opening and the tip of the magnetic core, the magnetic head has wear resistance and prevents damage to the magnetic medium due to uneven wear. This has the effect of reducing the deterioration of magnetic recording and reproducing magnetism without causing any damage.

Then, the high hardness thin film is made of TiN or TiC.

S iN, S I C, A I 203 and S t
O2 (D) may be made of any one material.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing a wear-resistant magnetic head according to the first embodiment of the present invention, Fig. 2 is a side view of the same, and Fig. 3 is after 1 million reciprocations according to an abrasion test using the same surface roughness meter. Figure 4 is a diagram showing the shape of the sliding part of the head in the initial stage, and Figure 5 shows the part to be deposited first in the third embodiment with diagonal lines. Figure 6 is a perspective view of a general head, Figure 7 is a cross-sectional view cut along the lines ■-■ in Figure 6, and Figure 8 is a conventional case with a sendust block or ceramic block. FIG. 9 is a sectional view taken along line IX-IX in FIG. A graph showing the wear amount of the magnetic core part after 1 million reciprocating card runs according to a wear test using the surface roughness of the head. Figure 12 is an explanatory diagram showing the measurement direction. Figures 13 and 14 are T. i
A diagram showing the shape of the sliding part after 500,000 reciprocating cart runs and 1,000,000 reciprocating runs of the cart, based on a wear test using a surface roughness meter for a head on which a μm thick N film was deposited;
FIG. 15 is a diagram showing the shape of the sliding portion at the initial stage. 1... Case 1a =--- Case portion 2... Opening 3... Magnetic core 3a... Core tip 4---- - Gap 7...Resin 7a...Resin portion 8=-TiN film 9--Pobin 10--One terminal The same reference numerals are the same in each figure. part or equivalent part

Claims (2)

[Claims] (1) A magnetic core made of a wear-resistant magnetic material is fitted into a case together with other magnetic head components, and the magnetic core is inserted into an opening formed in the surface of the case that constitutes the magnetic recording medium sliding surface. A magnetic head in which a magnetic core is fixed by casting resin into a case with the tip facing out, and the magnetic recording medium sliding surface of the case has a distance of 3 to 10 μm between the resin part of the opening and the magnetic core. A magnetic head characterized in that a highly hard thin film of 1 to 3 μm is formed on each tip. (2) The high hardness thin film is TiN, TiC, SiN, S
The magnetic head according to claim 1, characterized in that it is made of one of iC, Al_2O_3, and SiO_2.