JPS6273407A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To apply sure lapping to a slope reaching from the surface of a projection to the side face especially by using a pushing jig to push the lapping tape into a recess of a recording medium sliding face of a magnetic head and vibrating the lapping tape in the facial direction relatively to the recording medium sliding face. CONSTITUTION:A magnetic head subject to lapping has read/write gaps G1, G2 and a recording medium sliding face is formed with ruggedness in a way the read/write gaps G1, G2 are projected. In applying lapping to the recording medium slide face of the magnetic head as above by using the lapping tape L, a pushing jig inserted to recesses 81, 82 of the recording medium slide face is pushed from the above of the lapping tape L to push the lapping tape L into the recesses 81, 82 of the recording medium slide face. In this state, the lapping tape L is vibrated relatively in facial direction to the recording medium slide face. That is, the medium is vibrated in the direction of arrow or in a direction perpendicular to this paper.

Description

[Detailed Description of the Invention] [Summary] When finishing the tape sliding surface of a magnetic head for a magnetic tape device with lapping tape or knipping, the lapping tape is applied using a jig that fits into the recess of the tape sliding surface. By vibrating the lapping chive in the surface direction while it is pushed into the concave part, it is possible to wrap the entire surface uniformly including the side surfaces of the convex part.

[Technical field of invention]

The present invention relates to a method of manufacturing a magnetic head of a magnetic tape device or the like used as a file means in an information processing device.

[Conventional technology]

FIG. 5 is an enlarged cross-sectional view showing the vicinity of the gap of the magnetic head. In a magnetic head such as a magnetic tape device, gaps Gl and G2 are formed because a recording medium such as a magnetic tape slides.
A coating (wear-resistant layer) 2 made of hard chromium, ceramic, or the like is applied on a copper plating layer 1 for external noise shielding on the recording medium sliding surface around the recording medium to increase wear resistance.

In order to form the copper plating layer and the wear-resistant layer in this manner, the following steps are performed.

(1) The surface around the gap of the core material 4 or the housing portion is ground to form the uneven curved surface 3 as shown.

(2) Mask areas other than those to be copper plated.

(3) Immerse the magnetic head in a plating bath and apply copper plating 1.

(4) Remove the mask.

(5) The surface of the copper plating layer is ground and formed into a predetermined shape.

(6) Mask the copper plating layer 1 after grinding again to expose only the areas where hard chrome plating or ceramic spraying should be performed.

Hard chromium is plated on top of the copper plating layer using ceramic spraying.

(8) Eliminate clutter.

(9) Wear-resistant layer 2 made of hard chromium or ceramic
Grind the surface for a final finish. Note that the head surface grinding in this step and (1) (step 51) is performed by relatively moving the grinding wheel in the direction perpendicular to the plane of the drawing. 62 is formed as a convex strip in the direction perpendicular to the plane of the paper, a concave groove 7 is formed between the gap part part 51.52, and a concave groove 7 is formed between the gear part part 51.52 and the magnetic tape support convex part 61.62. Grooves 81 and 82 are formed.The outer sides of the magnetic tape support projections 61 and 62 are lowered by one step as shown by 91 and 92, so that the magnetic tape T escapes from hitting them.

αΦ As shown in FIG. 6, the lapping chive L is moved back and forth to polish the tape sliding surface, thereby stabilizing the running of the magnetic tape and preventing wear on the magnetic tape surface.

The wrapping tape roller contacts and slides against the head surface at the same angle as when the magnetic tape T runs.

[Problem that the invention seeks to solve]

By the way, when a recording medium such as a magnetic tape is run for a long period of time, the sliding surface of the recording medium wears out, and the side surface that has not been finished with lapping, that is, the side surface 10.
The ground finished surface indicated by ... will be exposed. Therefore, the recording medium slides on the rough surface due to the grinding finish, causing severe wear and tear on the recording medium and shortening the life of the recording medium.

Further, dust generated due to wear of the recording medium is caught between the gaps G1 and G2 and the recording medium T, which tends to cause errors such as dropouts when reading and writing information.

As shown in FIG. 6, lapping with a wrapping tape is performed by sliding the wrapping tape L back and forth under tension. At that time, the gear part part 51.52 and the magnetic tape support convex part 61.6
Only the second protruding portion is ground, and the initially curved surface 11 as shown in FIG. 7 is polished into a flat shape as shown at 12. Therefore, when the magnetic tape T is run, a gap g is generated between the magnetic tape and the gap G1, which deteriorates the electromagnetic conversion characteristics, particularly at high frequencies.

The technical problem of the present invention is to eliminate such problems in the conventional magnetic head manufacturing method and improve the lapping method for the sliding surface of the recording medium, so that even if the sliding surface of the recording medium is worn out, The purpose is to enable a recording medium to slide on a well-finished surface.

[Means for solving problems]

FIG. 1 is a sectional view illustrating the basic principle of the method of manufacturing a magnetic head according to the present invention. The magnetic head to be lapped has read/write gaps G1, G2, and the recording medium sliding surface has an uneven shape such that the read/write gaps G1, G2 are convex. When lapping the recording medium sliding surface of such a magnetic head with lapping tape, a pushing jig that fits into the recesses 81 and 82 of the recording medium sliding surface is prepared, and the pushing jig is inserted into the lapping chive L. The wrapping tape L is pressed into the recesses 81 and 82 on the recording medium sliding surface. In this state, the wrapping tape L is vibrated in the plane direction relative to the recording medium sliding surface. That is, it is vibrated in the direction of the arrow or in the direction perpendicular to the plane of the paper.

[Effect]

With the ramping tape L pushed into the recess of the recording medium sliding surface of the magnetic head using a pushing jig, the lapping tape L vibrates in the plane direction relative to the recording medium sliding surface. Therefore, the wrapping chip is pressed against the surface of each convex portion and the side surface of the convex portion with equal pressure. By vibrating the lapping tape L in uniform contact with the lapping tape L, the surface with which the lapping cheese L is in contact is uniformly wrapped, and in particular, the slope from the surface of the convex portion to the side surface is reliably wrapped.

[Embodiments of the invention]

Next, how the method for manufacturing a magnetic head according to the present invention is actually implemented will be explained using examples.

FIG. 2 is a sectional view of a main part showing an embodiment in which lapping is performed by the method of the present invention. 7t, 81t, 82t, 9
1t and 92t are respectively pushing plates (pushing jigs)
And the concave part of the magnetic head? R7, controls the action of pushing the wrapping chive L into the concave groove 81.82 and the hem portion 91.92 of the support convex portion 61.62. It is preferable that the wrapping tape L is brought into close contact with the surfaces of the magnetic head, such as the convex portions, grooves, and bottom portions. For this purpose, the tips of the push-in plates 7t, 81t, 82t, 91t, 92t are connected to the grooves 7, 81, 82, skirt portions 91.
With the wrapping tape L having a thickness D in close contact with the wrapping tape 92, the curved surface corresponds to the curved surface of the back surface of the wrapping cheese L at the cough groove 7, the groove 81.82, and the hem portion 91.92.

In addition, since the depths of each groove 7, groove 81.82, and bottom part 91.92 are different, each groove 7.8 of the magnetic field to be processed is
1.82, the amount of protrusion of the temporary push-in portions 7t, 81t, 82t, 91t, and 92t can be adjusted according to the depth of the hem portion 91.92.

The wrapping tape 11 includes each pushing plate 7t, 81t,
At the tips of 82t, 91t, 92t, each groove 7, groove 81, 82, bottom portion 91.
92 and are in close contact. When the wrapping tape L vibrates, the wrapping tape will not only touch the magnetic tape sliding surfaces at the tops of the gear protrusions 51.52 and the support protrusions 61.62, but also the concave grooves 7 and 81.82.
, the bottom surface of the hem portion 91.92, the groove 7, the groove 81.82,
The midsection between the hem portion 91.92, the gear protrusion portion 51.52, and the top end of the support protrusion portions 6e and 62 is evenly wrapped. The vibration of wrapping tape L is 60~1
Approximately 0011z is suitable.

Note that the entire jig is pressed with spring pressure, and each pushing plate 7L, 8
By pressing the tips of 1t, 82t, 91t, and 92t against the wrapping tape 11, the wrapping tape 1
1 can be more uniformly pressed against a curved surface.

In this manner, the lapping tape L vibrates while being pushed into the recessed portion of the recording medium sliding surface by the pushing jig, so that the entire surface of the convex portion and the side surface of the convex portion are uniformly wrapped. That is, as shown in FIG. 7, there is no case where only the top of the convex portion is roughened, resulting in excessive lapping in a localized area. The wrapping speed has also become about 3 to 5 times faster than before.

In this embodiment, the wrapping tape L is also in contact with the bottom surface of the recess, but the wrapping tape L can also be vibrated while floating above the bottom surface of the recess as shown in FIG.

When the pushing jig is not used, as shown in FIG. 3, the wrapping tape L is brought into close contact with the wrapping tape L in exactly the same manner as the tape runs in the magnetic tape device. The wrapping tape L is then reciprocated, and the time it takes to reach a steady speed at the time of reversal at the end of the stroke is about 0.8 m5ec. Since the tape running speed is about 5 m/sec, the speed is raised from a stopped state to about 5 m/sec within 0.8 m5ec. Also, a suitable fall time when stopping at the end of inversion is about 0.8 m5ec. It is preferable that the inversion period be as short as possible, for example 0.
About 3 seconds is effective. And under these conditions, 30
Perform ramping for about 60 seconds. Then, as shown in FIG. 4, a curved surface 13 follows the curved surface 11 before wrapping, and
The shape of the tape sliding surface does not collapse during the lapping process, and the magnetic tape T can run in close contact with the convex surface during read/write operations, eliminating the risk of errors.

Note that the above-mentioned rising conditions for the return operation of the wrapping tape L at the stroke end and falling conditions for stopping at the stroke end are the stop and start conditions when the magnetic tape is actually run in the magnetic tape device. is almost the same.

When the wrapping tape L is reciprocated at high speed in this way, the wrapping tape L collides with the slope in front of the convex part, and at that time the slope is wrapped, and since no impact force is applied to the surface of the convex part, Excessive wrapping of convex surfaces will no longer occur.

This embodiment can be used instead of the methods shown in FIGS. 1 and 2, or both methods can be used in combination.

〔Effect of the invention〕

As described above, according to the present invention, the push plates 7t, 81t
, 82t, 91t, and 92t, the wrapping tape L is inserted into the grooves 7 and 8 on the recording medium sliding surface of the magnetic head.
1.82, the wrapping tape vibrates when it is pushed into the hem 91.92. As a result, not only the surface of the convex part, but also the part that will be exposed in the future due to wear due to the running of the recording medium, is
Wrapping processing is applied in advance. Therefore, even if the sliding surface of the recording medium wears out while reading and writing information by sliding the recording medium against the magnetic head, the newly exposed surface due to the wear is also lapped. Since the surface is smooth, the rough surface of the grinding state is not exposed as in the conventional case. Therefore, there is less wear and tear on the recording medium such as the magnetic tape, the life of the recording medium is extended, and the dropout of information during read/write due to abrasion dust is eliminated, resulting in higher reliability. Furthermore, since the recording medium sliding surface is wrapped uniformly over the entire surface, a curved surface as designed can be obtained, and a medium such as a magnetic tape can be read and written in close contact with the gap, eliminating the occurrence of errors.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view explaining the basic principle of the method for manufacturing a magnetic head according to the present invention, FIG. 4 is a cross-sectional view showing the lapping surface according to another embodiment, and FIG. 5 is a magnetic head with an uneven recording medium sliding surface. FIG. 6 is a cross-sectional view of a main part showing a conventional lapping method, and FIG. 7 is a cross-sectional view showing a processed surface lapped by a conventional method. In the figure, T is a magnetic tape, G1, G2 are read/write gaps, 7.8L 82 is a groove, 91.92 is a bottom, 7t, 8H, 82t, 91t, 92t are push plates (push jig), 10 . . . indicates an area that cannot be wrapped, and L indicates a wrapping tape. Patent Applicant: Fujitsu Limited Agent, Patent Attorney: Minoru Aoyagi Another tribute plane example of Kibatsuro Fig. 3 Another child 1 X,) Ping φ 4 Ryo Zeng Fig.

Claims (1)

[Claims] A lapping tape (L ), prepare a pushing jig that fits into the recesses (81) and (82) on the sliding surface of the recording medium, and attach the pushing jig to the wrapping tape (L).
Press from above to vibrate the wrapping tape (L) in the plane direction relative to the recording medium sliding surface while pushing the wrapping tape (L) into the recess of the recording medium sliding surface. Features: Manufacturing method of magnetic head.