KR920008432B1 - Magnetic lapping method and lapping device and magnetic head by using it - Google Patents

Abstract

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Description

Magnetic head lapping method and magnetic head lapping apparatus used for this, and magnetic head obtained using the same

1 is a cross-sectional view showing main portions (tape guide cylinder portion, head holder cylinder, cylinder drive portion and tape forming guide portion and its vicinity) of a magnetic head wrapping apparatus according to an embodiment of the present invention.

FIG. 2a is a perspective view of the main part of the magnetic head wrapping apparatus, as shown in FIG.

FIG. 2B is a perspective view showing an abrasive tape traveling situation of the magnetic head wrapping apparatus shown in FIG. 1. FIG.

FIG. 3 is a plan view showing the situation during the polishing operation of a particularly important part of the magnetic head wrapping apparatus shown in FIG.

FIG. 4 is a plan view showing a situation before polishing operation of a particularly important part of the magnetic head lapping apparatus shown in FIG.

FIG. 5 is a sectional view showing the periphery of the magnetic head polishing portion of the magnetic head wrapping apparatus shown in FIG. 1. FIG.

6 is a perspective view showing a tape traveling system of the magnetic head wrapping apparatus shown in FIG.

7 is a perspective view showing the main part of a tape forming guide of a magnetic head wrapping apparatus in another embodiment of the present invention.

8 is a cross-sectional view showing a magnetic head polishing portion side in a conventional magnetic head wrapping apparatus.

9A to 9C are sectional views showing the polished state of the polished magnetic head chip.

10 is a graph showing the relationship between the shape radius of the chip and the magnetic head protrusion amount in lapping the magnetic head chip in the case of using a tape forming guide.

11 and 12 are explanatory views showing a situation in which the tape forming guide is rotated and vibrated in the magnetic head wrapping apparatus of the present invention.

13 is a graph showing the relationship between the shape radius of a magnetic head chip and the spacing between a pair of tape forming guides.

Fig. 14 is a graph showing the relationship between the center movement amount of the radial direction of the magnetic head chip and the vertical movement amount of the tape forming guide portion.

15 is a perspective view showing a magnetic head chip.

16 is a cross-sectional view of the magnetic head chip.

FIG. 17 is a graph showing the effect of the difference between the values a and b shown in FIG. 16 on the head output. FIG.

* Explanation of symbols for main parts of the drawings

1: polishing tape 9a, 9b: brake roller

11a, 11b: tape guide cylinder 20a, 20b: tape forming guide

30: head holder cylinder 31: head holder cylinder drive motor

40: magnetic head C: tape guide cylinder portion

F: Tape forming guide part P: Polishing tape pressing surface

T: Tape running system

According to the present invention, a method of polishing a magnetic head, in particular, a method of polishing a magnetic head tape slide surface, a magnetic head lapping apparatus used for this polishing, in particular, a shape of a magnetic head, particularly a tape slide surface obtained by using these of the magnetic head tape slide surface, can be obtained with high precision. A magnetic head for a polished VCR (Video Cassette Recorder) and a magnetic recording and reproducing apparatus using the head.

Fabrication of the magnetic head requires the polishing of the tape slide surface of the magnetic head. The conventional magnetic head wrapping apparatus used for such a work attaches a magnetic head (workpiece) to a tape guide cylinder which is a rotating body, rotates it at a predetermined speed, and simultaneously spirally polishes the polishing tape along the outer circumference of the guide cylinder. Winding in one direction. The magnetic head was attached to protrude slightly from the guide tube so as to polish the surface in contact with the polishing tape. In this manner, the abutting surface was polished into the shape of the tape slide surface having the same tape as that attached to the actual VCR.

Related to this type of device is, for example, Japanese Patent Laid-Open No. 55-101130 and Japanese Patent Laid-Open No. 58-13972.

However, the above-described prior art is not concerned with the method of adjusting the protrusion amount and the apparent tape stiffness when the magnetic head is attached to the rotating body to protrude from the rotating cylinder. The instability of precision such as the difference in the center position of the magnetic head gap, that is, the amount of eccentricity, the radius of curvature in the tape running direction, and the radius of curvature of the magnetic head, is large, and the output characteristics are not satisfied due to poor contact of the magnetic head with the magnetic tape. Therefore, regrinding may be performed, resulting in a large time loss of polishing.

That is, the protrusion amount (hereinafter referred to simply as protrusion amount) in the tape guide cylinder of the magnetic head is Δt, the magnetic tape running direction shape radius (see FIG. 15) is Rx, and perpendicular to the magnetic tape running direction. If the directional shape radius (see FIGS. 9, 15, and 16) is Ry, the relationship between them is as shown in FIG. In this case, the tape tension was 1.96 N. In the figure, as the protrusion amount Δt increases, both the running direction radius Rx and the right angle radius Ry tend to decrease, and in order to improve the shape accuracy of the running direction radius Rx and the right angle radius Ry, Indicates that it needs to be set. Rx and Ry are collectively called shape radius R.

8 is a sectional view of principal parts showing an example of a polished state of the magnetic head by a conventional magnetic head lapping apparatus, and FIGS. 9A to C are schematic views showing examples of the magnetic head polished thereby.

In Fig. 8, reference numeral 41 denotes a guide tube, in which a magnetic head 40 which fixes the head chip 40a to the head base 40b is protruded and attached only a small amount from its outer circumference. Then, the tape slide surface S of the magnetic head 40 is polished by the polishing tape 1.

However, during the polishing, the polishing tape 1 may be damaged due to variations in contact resistance between the polishing tape 1 and the guide cylinder 41, variations in tape tension, variations in contact resistance between the head chip 40a and the polishing tape 1, and the like. Since it moves in the vertical direction, a position error of the head chip 40a with respect to the center of the width W of the polishing tape 1 occurs.

As a result, when the head needle 40a is positioned with respect to the center of the polishing tape 10, as shown in FIG. 9B, the upper direction of the width direction of the head chip 40a becomes convex, and an inclination occurs in the width direction. It was. On the contrary, when the head chip 40a is below, as shown in FIG. 9C, the lower part of the width direction of the head chip 40a becomes convex, and this also inclines in the width direction.

Therefore, the curvature radius Ry of the desired state of the tape slide surface S as shown in FIG. 9A, that is, the tape running direction and the direction perpendicular to the tape running direction (head chip thickness h direction) is a predetermined value, and the center of curvature is the thickness center (h). It was difficult to obtain the shape located at / 2), and the instability of the shape dimension between the workpieces was also large.

As described above, when the magnetic head is attached to the tape guide cylinder which is a rotating body, the above-described conventional technique is adapted to adjust the amount of protrusion of the magnetic head from the tape guide cylinder, adjust the apparent tape stiffness, and change the position of the polishing tape during polishing. Due to the lack of consideration, the tape slide surface of the magnetic head was not desired and the instability between the workpieces could not be polished small. For this reason, poor contact of the magnetic head occurred, which inevitably resulted in regrinding, resulting in a significant loss of productivity.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic head lapping method which can solve the problems of the prior art and can polish the tape slide surface of the magnetic head to a desired shape with less instability.

Another object of the present invention is to provide a magnetic head wrapping apparatus for use in the method.

It is still another object of the present invention to provide a high precision magnetic head obtained by using the above method and apparatus and a magnetic recording and reproducing apparatus having the same.

The above and other objects and novel features of the present invention will become apparent from the description and the accompanying drawings.

The effect obtained by the representative of the invention disclosed in this application is briefly described as follows.

The magnetic head wrapping method of the present invention guides the polishing tape running on the outer circumferential surface of the pair of tape guide cylinders facing each other in the axial direction at a predetermined interval so as to protrude a predetermined amount from the outer circumferential surface of the tape guide cylinder. A method of polishing a tape slide surface of a magnetic head held during the interval with the running polishing tape, wherein the tape slide surface of the magnetic head is pressed while pressing the tape forming guide to the polishing tape in contact with the outer circumferential surface of the tape guide cylinder. To polish. The tape forming guide presses the polishing tape against the tape guide cylinder is naturally a cylindrical inner surface having the same curvature as the outer circumferential surface of the tape guide cylinder, and the upper and lower sides thereof except for the magnetic head opposing part in the width direction of the polishing tape. (That is, both ends of the polishing tape). In addition, better results are obtained when the tape forming guide is vibrated while vibrating. In addition, the air may be ejected from the slits provided on the pressing surface of the polishing tape of the tape forming guide, and the polishing tape may be pushed to the outer circumferential surface of the tape guide cylinder by air pressure.

In the case of vibrating the tape forming guide, it is possible to use rotational vibration centered on the center plane of the magnetic head chip in the thickness direction or linear vibration in the direction toward the center axis of the tape guide cylinder.

The configuration of the magnetic head wrapping apparatus of the present invention used in the magnetic head wrapping method of the present invention is to support two, that is, one set of tape guide cylinders having the same outer diameter freely on the same axis so as to rotate freely between the two tape guide cylinders. A tape guide cylinder portion capable of setting the interval of the predetermined value to a predetermined value, and a head holder cylinder (or workpiece support portion) supported on the same axis in one tape guide cylinder of the tape guide cylinder portion so as to allow relative rotation with the tape guide cylinder. Head holder cylinder), a cylinder drive unit capable of alternately rotating the head holder cylinder in a forward and reverse direction at predetermined time intervals, and polishing along the outer circumferential surface of both tape guide cylinders of the tape guide cylinder As having tape running system which can run tape, The head holder cylinder is a magnetic head wrapping apparatus that is capable of attaching and holding a workpiece at a position where the tip thereof protrudes by a predetermined amount from the outer circumferential surface of the tape guide cylinder within the gap. The peripheral surface is provided with two or one sets of tape forming guides having a polishing tape pressing surface formed so as to conform to a predetermined angle (angle α in FIG. 3), and these are polished in correspondence with the outer circumferential surface of each tape guide cylinder. The tape forming guide part which can press the both ends of the width direction of a tape toward a tape guide cylinder shaft center is provided.

That is, the magnetic head lapping apparatus of the present invention guides the cotton hemp tape on the outer circumferential surface of the pair of tape guide cylinders facing each other at a predetermined interval, and the magnetic head is provided to protrude a predetermined amount from the outer circumferential surface of the tape guide cylinder. An apparatus for polishing a tape slide surface of a head with the polishing tape, the tape forming guide portion being pressed against and touching the outer circumferential surface of the polishing tape traveling on the outer circumferential surface of the tape guide cylinder, thereby forcibly polishing the abrasive tape. It is to be able to form.

Moreover, in order to prevent abrasion of a tape guide cylinder, the brake roller which can rotate a tape guide cylinder in synchronization with sending a polishing tape was provided.

In addition, low friction coefficient resin may be used as the material of the tape forming guide, or air may be ejected from the slit provided on the pressing surface of the abrasive tape of the tape forming guide to press the abrasive tape against the outer circumference of the tape guide cylinder by air pressure. It would be.

Further, if the tape forming guide is provided with a means for rotating and oscillating around the plane through the center of the magnetic head chip in the thickness direction, more preferable results are obtained.

By the way, the magnetic head of the present invention obtained by the method and the apparatus of the present invention has good symmetry in the cross section of the shape of the magnetic tape slide surface perpendicular to the tape slide direction. (I.e., the curved surface corresponding to the perpendicular radius Ry appearing in the cross section is symmetrical). Assuming that the cross section is within a range of 0.2 mm from the center of the magnetic gap in the construction gap of the magnetic head, the heights of both sides at a position 0.05 mm away from the center of the center of the tape slide in the direction perpendicular to the tape slide direction (see FIG. 16). A magnetic head having good symmetry with a difference of a and b) of 0.1 m or less is obtained.

The overall height (Wg in FIG. 5) of the tape forming guide portion is 2.5 to 35 mm, and the height of each of the pair of tape forming guides is 1 to 10 mm. The interval between the pair of tape forming guides facing each other is 0.5 to 15 mm. When the height of each tape forming guide is less than 1 mm, the effect of this invention cannot be expected very much, and even if it exceeds 10 mm, the effect of saturating and raising a height cannot be expected. If the distance between the tape forming guides is less than 0.5 mm, the deformation of the polishing tape becomes excessively strict, and if it exceeds 15 mm, it is close to the prior art which does not use the tape forming guides. The total height of each pair of upper and lower tape forming guides and their spacing is obtained to obtain the total height of the tape forming guide portion.

The radius of curvature of the inner circumferential surface of the tape forming guide portion may be approximately equal to the radius of curvature of the outer circumferential surface of the tape guide cylinder, but is generally 0 to 1 mm larger than the radius of curvature of the outer circumferential surface of the tape guide cylinder. However, the radius of curvature of the inner circumference of the tape forming guide may not be limited to the above value as long as the running polishing tape is guided by a cylindrical curvature of the radius of curvature that is approximately equal to the radius of curvature of the outer circumferential surface of the tape guide cylinder. .

The width direction and the upper end of the polishing tape, the upper end of the tape forming guide, and the lower end of the polishing tape and the lower end of the tape forming guide do not need to coincide with each other.

The tape forming guide is set so that the abrasive tape is sandwiched between the outer circumference of the tape guide cylinder and the inner circumference of the tape forming guide, and at the same time, a cylindrical surface having a radius of curvature substantially the same as the outer circumference of the tape guide is fixed so as not to shake during operation. do. In this case, the tape forming guide is set with a pressing force such that the polishing tape can easily run. This can easily be accomplished by experiment.

The material of the tape forming guide may be any material if the strength is sufficient, for example, iron, nonferrous metals or plastics, but especially when the resin product is made of a low friction coefficient, the friction between the polishing tape and the tape forming guide is very small and the polishing tape is braked. A stable polishing operation can be performed without the need to perform the same effect, and the same effect can be obtained even if only the pressing of the polishing tape of the tape forming guide is made of a resin having a low friction coefficient, and other parts are used with iron, nonferrous metals, and the like.

In terms of eliminating the braking, it is most preferable that the air is blown toward the polishing tape at the slit provided on the pressing surface of the polishing tape of the tape forming guide.

The protrusion amount of the magnetic head chip on the outer circumference of the tape guide cylinder is preferably 50 to 40 µm, and the contact angle to the polishing tape guide cylinder is 60 to 180 degrees. The contact angle corresponds to the angle α in FIG. 3. As shown in FIG. 5, the interval between the upper and lower pairs of tape forming guides is divided up and down at the center of the magnetic head chip to make Wb and Wa, respectively, so that both Wb and Wa are 0.25 to 7.5 mm.

Since the magnetic head lapping apparatus of the present invention provides a tape forming guide, the polishing tape has no change in position with respect to the tape slide surface of the magnetic head (workpiece), whereby the center of curvature of the magnetic head chip has a center of curvature ( That is, it is possible to obtain a tape slide surface having a curvature radius of eccentricity = 0). In addition, since the apparent rigidity of the polishing tape is improved, the size of the radius of curvature can be easily controlled by adjusting the pressing force of the polishing tape and the interval between the tape forming guides. That is, both of reducing the abrasive tape pressing force and increasing the distance between the tape forming guides increase the shape radiuses Rx and Ry of the tape slide surface of the magnetic head. The abrasive tape pressing force is increased by increasing the tension of the tape and the magnetic head protrusion amount [Delta] t.

By providing the brake roller as described above, since the polishing tape does not polish the outer surface of the tape guide cylinder, the life of the magnetic head wrapping device can be prolonged without changing the amount of protrusion of the head chip in the tape guide cylinder even if the device is used for a long time. .

In this invention, since the protrusion amount of a magnetic head can be measured non-contactingly and it can be attached so that the protrusion amount of the magnetic head in a tape guide cylinder can be made constant, it can be set as the predetermined radius of travel Rx and the radius of right Ry.

Further, by processing while measuring the head line unit value, the shape accuracy of the magnetic head can be improved.

In addition, in order to make the external tape stiffness in the width direction of an abrasive tape constant, as shown in FIG. 5, tape forming guides 20a and 20b are provided, and tape forming guides 20a and 20b are provided. By setting the distance Wa and Wb from the center of the magnetic head chip 40a to a predetermined position, the shape accuracy in the direction perpendicular to the tape running direction of the magnetic head 40 and the center of the magnetic head gap and the tape of the magnetic head 40 The difference between the running direction and the center of the radius Ry in the perpendicular direction, that is, the shape accuracy such as the amount of eccentricity is improved, and the tape forming guides 20a and 20b are in the same plane as the center of the magnetic head chip 40a, for example. Rotate vibration around 0 at. That is, the shape when the tape forming guides 20a and 20b are inclined by the angle θ is in a block shape upward as shown in FIG. Therefore, the shapes shown in Figs. 11 and 12 are synthesized by repeatedly repeating the tape forming guides 20a and 20b from -θ to θ, so that they are perpendicular to the traveling direction of the magnetic head. Shape accuracy in the direction (thickness direction) is improved. As described above, instead of rotational vibration, linear vibration in a direction toward the central axis of the tape guide cylinder may be used. Although the frequency of vibration is 1 to 2 Hz and a favorable result is obtained, it does not need to be limited to this.

EMBODIMENT OF THE INVENTION Hereinafter, the structure of this invention is demonstrated with an Example.

Example 1

A first embodiment of the present invention will be described with reference to FIGS. 1 to 6. In the magnetic head wrapping apparatus of this embodiment, two sets of tape guide cylinders (11a) and (11b) having the same outer diameter are freely supported on the same axis so as to freely support the two tape guide cylinders (11a) and (11b). One tape guide cylinder portion C and one tape guide cylinder portion C of one tape guide cylinder 11b of the tape guide cylinder portion C so as to be able to set the interval δ are supported so that relative rotation with the tape guide cylinder 11b is possible. The head holder cylinder 30 and the tape for the head holder cylinder drive which are caught by the cylinder drive part which can rotationally drive the head holder cylinder 30, this head holder cylinder 30 in a forward rotation and a reverse rotation direction at predetermined time intervals. It has a tape traveling system T which can drive the polishing tape 1 along the outer peripheral surfaces of both the tape guide cylinders 11a and 11b of the guide cylinder part C. As shown in FIG. The head holder cylinder 30 is a position in which the magnetic head 40 caught on the workpiece is projected by a predetermined amount? T from the outer circumferential surface of the tape guide cylinders 11a and 11b within the interval δ. It is to keep it possible to attach and detach from. In addition, the apparatus includes two sets of tape forming guides 20a and 20b having an abrasive tape pressing surface P formed on the outer circumferential surfaces of the tape guide cylinders 11a and 11b in a predetermined angle range. And a tape forming guide F capable of opposing the outer circumferential surface of each of these tape guide cylinders 11a and 11b so as to press both widthwise ends of the polishing tape 1 in the axial direction of the tape guide cylinder. At the same time, two sets of brakes which abut against the outer circumferential surfaces of the tape guide cylinders 11a and 11b (opposite to the tape forming guide shaft) and rotate them in synchronism with the polishing tape 1. The rollers 9a and 9b are provided.

It will be described in more detail below.

First, the tape odometer T will be described. In FIG. 6, the tape abrasive tape supply reel 2 and the abrasive tape winding reel 10 are arrange | positioned on the tape traveling system support 15. As shown in FIG. An abrasive tape 1 is interposed between the two reels. The abrasive tape 1 is released from the abrasive tape supply reel 2 and passes between the pinch roller 3a and the gap turn roller 4a. Pass through 7a) in order of guide roller 8a, tape guide cylinders 11a, 11b, guide roller 8b, impedance roller 7b, pinch roller 3b, and captain roller 4b. The coil is wound around the winding tape reel 10. The guide rollers 8a and 8b have a contact angle (α in FIG. 3) to the outer circumferential surface of the guide cylinders 11a and 11b of the polishing tape 1 during polishing. It moves to the position shown in FIG. 3 so that it may become 90 degrees, and it returns to the position shown in FIG. 4 at the polishing preparation stage and the completion | finish of grinding | polishing. (The drive means is not shown).

The brake rollers 9a and 9b are attached to contact the outer circumferential surfaces of the tape guide cylinders 11a and 11b. The pinch roller drive motor 5 is defective in the pinch roller 3b on the polishing tape winding side, and the pinch roller 3a on the polishing tape supply side and the polishing tape winding reel 10 are synchronized with the rotation of the pinch roller 3b. ) Rotates to feed the polishing tape 1, and the brake rollers 9a, 9b pass through the pulleys 12, 13, 16, and the timing belts 6a, 6b, 6c. It is driven so that the tape guide cylinders 11a and 11b can be rotated in synchronization with the polishing tape 1.

The tape traveling system support member 15 is capable of stepping the polishing tape 1 in the vertical direction by a step motor (not shown).

Next, the main structure of this apparatus is demonstrated. 1 to 5, the head holder cylinder 30 held by the bearing 34b is mounted in the tape guide cylinder 11b. On the upper surface of the head holder cylinder 30, a database 40 (one or several) to be processed is mounted by projecting a predetermined amount [Delta] t (150 [mu] m in this embodiment) from the outer circumference of the tape guide cylinder 11b. This can be maintained freely. (How to maintain is not shown). In addition, a head holder cylinder rotation shaft 32 having a conical tip is fitted in the lower part of the head holder cylinder 30, which is coupled to the head holder cylinder driving motor 31.

The tape guide cylinder 11a having the same outer diameter as the tape guide cylinder 11b held on the head holder cylinder holding shaft 33 via the bearing 34a at the same center as the head holder cylinder 30 is lowered from above. It has a predetermined price δ (2 mm in this embodiment) and can be combined with the tape guide cylinder 11b. The tape guide cylinder 11a and the head holder cylinder holding shaft 33 are held by the tape guide cylinder up and down head 35 and the tape guide cylinder up and down head base 36. (Drive mechanism not shown).

The outer peripheral portions of the tape guide cylinders 11a and 11b are in contact with the brake rollers 9a and 9b which can rotate the tape guide cylinders 11a and 11b in synchronization with the polishing tape 1. have.

Two tape forming guides 20a, 20b, each having a diameter of 62 mm and a height of 7 mm, can be brought into contact with the outer circumferential portion of the polishing tape 1 with a predetermined pressing force. The pressing surface of these tape forming guides 20a and 20b is resin of low friction coefficient (fluorocarbon resin, nylon, etc.), and the other part is formed with iron. The tape forming guide F is a tape forming guide gap adjusting stage 21 which can adjust these tape forming guides 20a and 20b, and the tape forming guide intervals Wa and Wb (in this embodiment, they are all adjusted to 305 mm). (21), adjustment aggregates (22a), (22b), magnetic head (40) that can adjust the states of the tape forming guide interval adjustment aggregates (21a), (21b), the tape forming guides (20a), (20b) ( The X table 27 for pressing the Z table 26 for positioning in the thickness direction of the workpiece), the Z table height adjustment aggregate 23, the tape forming guides 20a and 20b to the polishing tape 1, The pressurization part 29, the tape forming guides 20a, and 20b are comprised by the gonio stage 25 for inclining the whole, and the adjustment aggregate 28 for inclining this gonio stage 25. As shown in FIG. The Konio stage inclination motor 28 'may be provided instead of the adjustment aggregate 28.

The operation of the magnetic head wrapping apparatus configured as described above will be described.

The tape guide cylinder 11b with the head holder cylinder 30 attached thereto is taken out of the apparatus body, and the protrusion amount is set to a predetermined amount Δt at a predetermined position on the upper surface of the head holder cylinder 30 so that a plurality of (eg, And two) unprocessed magnetic heads 40 are attached and held. Then, the tape guide cylinder 11b is returned to the apparatus main body, and the lower part of the head holder cylinder is inserted into the upper end of the head holder cylinder rotation shaft 32.

Next, the tape guide cylinder 11a is pulled down by the tape guide cylinder upper and lower sending heads 35, and the space between the cylinders is set to a predetermined value and combined with the tape guide cylinder 11b. The brake rollers 9a and 9b are brought into contact with the tape guide cylinders 11a and 11b.

When the excitation magnetic head lapping apparatus is turned ON, the guide rollers 8a and 8b are advanced by the driving means from the state of FIG. 4 to the state of FIG. 3 to move the polishing tape 1 to the tape guide cylinder 11a, At the same time, the pinch roller drive motor 5 is rotated and the abrasive tape 1 is wound around the abrasive tape winding reel 10, and a constant tension is applied thereto. The tape forming guide portion F set at the predetermined tape forming guide interval Wa, Wb and the tape forming guide inclination angle (in this polishing operation, the inclination angle is set to 0) is advanced by the goa cylinder 29, and thus the tape guide cylinder 11a, ( 11b) is contacted with a predetermined pressing force. The head holder driving motor 31 views a predetermined high speed rotation (speed of 2800 m / min in the present embodiment). The head holder driving motor 31 rotates the head holder cylinder 30 by a predetermined timer for a predetermined time (all three seconds in this embodiment) in the forward rotation direction and the reverse rotation direction. By rotating the head holder driving motor 31 forward and reverse as described above, the polishing tape slide surface of the magnetic head 40 can be polished into an arc shape having a radius of curvature desired from zero eccentricity. When the six forward and reverse rotation polishing operations of the head holder cylinder 30 are completed, the tape forming guide part F retreats and the guide rollers 8a and 8b return to the positions shown in FIG. . The head holder cylinder drive motor 31 stops, and the pinch roller drive motor 5 also stops. The tape guide cylinder up-and-down sending head 35 is raised, and the head holder cylinder 30 and the tape guide cylinder 11b are taken out from the apparatus main body by a conveying means (not shown). This completes one cycle of the polishing step.

FIG. 2B is a perspective view of the state where the polishing tape 1 is being driven while being pressed against the outer circumferential surfaces of the tape guide cylinders 11a and 11b by the guide forming tapes 20a and 20b. The forward and reverse rotation of the head holder driving motor 31 causes the contact pressure between the polishing tape 1 and the head chip 40a to increase at the inflow side of the polishing tape 1 (front of the magnetic head in the rotational direction). This results in a large amount of processing (processing rate (Q) ∝ speed (V) × pressure (P) × coefficient (C), so that it can be processed uniformly in an arc shape with respect to the center of the magnetic head by reverse rotation). It is common in abrasive tape processing.

Next, the tape running system support 15 causes the polishing tape 1 to be perpendicular to the traveling direction by the thickness of the magnetic head 40 (however, the polishing tape width W)-(tape forming guide width Wg) = W or less). The step is sent to the direction.

Another head holder cylinder 360 to which the raw magnetic head 40 is attached is fitted to the upper end of the head holder cylinder rotation shaft 32 of the apparatus main body by the conveying means, and as described above, the next cycle of the polishing process is performed. Is executed, and then this cycle is repeated.

In this way, when the polishing process of the magnetic head 40 having a predetermined coefficient is completed, the magnetic head wrapping apparatus is turned OFF.

In this embodiment, in order to suppress the wear of the tape guide cylinder as described above, the method for rotating the tape guide cylinder in synchronization with the sending of the polishing tape (1), but also in the method of rotating the tape head holder cylinder at high speed at the same speed The same effect as using the tape forming guide of the system is obtained.

Next, the magnetic head chip obtained by using the magnetic head wrapping apparatus of this embodiment will be described.

As a result of grinding the head chip of the magnetic head 40 having a width of 2.3 mm x 1.7 mm x 0.14 mm in thickness, the head chip has a center of curvature and a desired radius of curvature of 4 mm. A tape slide surface was obtained, and the instability between cycles of the polishing step was also very small.

In addition, the instability of the criminal radius Rx and Ry of the magnetic head chip obtained in the present embodiment is greatly reduced as compared with the conventional technique in which the tape forming guide is not used as shown in FIG. In addition, as shown in FIG. 14, when the tape forming guide is moved in the direction perpendicular to the polishing tape slide direction, the center of the front end curvature of the magnetic head chip, that is, the center of the rectangular shape radius Ry is accurate to the movement amount of the tape forming guide. Moving proportionally to obtain an arbitrary shape of the chip.

As shown in FIG. 15, if the? 'And' B 'sections are perpendicular to the tape travel direction and fall perpendicular to the tape travel direction in the working gap 50 of the magnetic head chip, FIG. A cross section having a rectangular radius Ry as shown in the figure is obtained. As for this cross section, the distance of the level of the front end of a tape slide surface side, and the position where this tape slide surface crosses a chip side is set to a and b as shown in FIG. When the absolute value of the difference between a and b is p, the relationship between the head output and p is shown in Fig. 17. The data in FIG. 17 is data obtained in the range of (ι, ι ') ≤ 0.2 mm. As can be seen in FIG. 17, when the value of p is larger than 0.1 mu m, the magnetic head characteristics are drastically deteriorated. Therefore, a magnetic head of p ≦ 0.1 μm at (ι, ι ′) ≦ 0.2 mm is preferable in view of magnetic properties. Further, a smaller value of p indicates that the center of curvature of the head chip tip portion is closer to the center of the chip thickness, so that the symmetry is better. In this embodiment, a magnetic head having a p of 0.1 m or less is obtained. In addition, the value of P of the magnetic head chip manufactured by the prior art which does not use a tape forming guide was about 0.25 micrometer when the other manufacturing conditions were the same as this Example.

According to this embodiment described above, the following effects are obtained.

(A) Since the polishing tape 1 is pressed by the tape forming guide part F, the variation of the workpiece of the polishing tape 1 is eliminated, and the tape slide surface of the magnetic head 40 is centered on the thickness of the head chip. It can be polished into a shape having a center of curvature and a desired radius of curvature.

(B) Since the tape forming guide portion F was pressed against the polishing tape 1, the apparent rigidity of the polishing tape 1 was improved, and the tape slide was adjusted by adjusting the pressing force and the tape forming guide spacing Wa and Wb. The size of the radius of curvature of the surface can be easily controlled.

(C) When the tape forming guides 20a and 20b are inclined by adjusting the gonio stage 25 of the tape forming guide part F so that the pressing forces on the tape guide cylinders 11a and 11b are different from each other, The center of curvature radius formed on the tape slide surface of the magnetic head 40 can be eccentric by a desired amount.

(D) Since the pressing surface of the tape forming guides 20a and 20b is formed with a resin having a low coefficient of friction, the frictional force with the polishing tape 1 is so small that polishing of the magnetic head without braking it is performed. Work can be performed stably and smoothly.

(E) Since the brake rollers 9a and 9b were provided to rotate the tape guide cylinders 11a and 11b and the polishing tape 1 in synchronism, the tape guide cylinders 11a and 11b were used. It is possible to maintain the precision of the magnetic head wrapping device for a long time without causing wear of the metal (and thus causing no change in the amount of protrusion of the workpiece), thereby improving the service life.

(F) After finishing the polishing process of one cycle, the tape running support 15 was used to send the polishing tape 1 up step, and in the next cycle, the polishing process of the tape slide surface was performed on the new polishing surface. A very good slide surface is obtained without scratches such as scratches on the tape slide surface.

Example 2

7 is a perspective view showing the main part of the tape forming guide of the magnetic head wrapping apparatus according to the present embodiment.

The tape forming guides 20a 'and 20b' are formed by boring slits 43a and 43b capable of blowing gas onto the polishing tape slide surface p ', respectively.

Since it is comprised in this way, the abrasive tape 1 can be pressed by the air pressure blown out from the slit 43a, 43b, and the tape forming guide 20a ', 20b' and the abrasive tape 1 are non-contact. Therefore, the polishing operation can be performed very smoothly without braking the polishing tape 1 at all.

Further, in the first and second embodiments, the brake rollers 9a and 9b can be brought into contact with the outer circumferential surfaces of the tape guide cylinders 11a and 11b and rotated in synchronization with the polishing tape 1. Since the brake rollers 9a and 9b do not need to be provided. However, it is as mentioned above that this provision can reduce the abrasion of the tape guide cylinders 11a and 11b.

Moreover, in the said Example 1 and 2, although the running direction of the abrasive tape 1 was made orthogonal to the axis | shaft of the tape guide cylinders 11a and 11b, you may make it run in this inclined direction. The operation for inclining may be performed by the tape traveling system support 15.

In this way, when the polishing tape 1 is driven in an oblique direction, the length of the polishing tape 1 can be effectively used, and at the same time, the tape slide surface of the magnetic head 40 is always on the new polishing surface of the polishing tape 1. There is an advantage that it can be polished.

In addition, in the first and second embodiments, the magnetic head 40 was polished by one unit, that is, one unit of magnetic head lapping apparatus, but in order to shorten the processing time and increase efficiency, the first abrasive tape 1 May be used, and fine polishing tape may be used in order to improve the roughness of the polishing surface. In this case, the unit of the above embodiment is disposed, for example, for rough processing, intermediate finishing, and finishing units, and # 4000 in the processing unit having roughened the grain size of the polishing tape of each unit, and # 8000 in the intermediate finishing unit. In the finishing unit, the head holder cylinder 30 and the tape guide cylinder 11b may be loaded and unloaded on the head holder cylinder drive shaft 32 by using a conveying means as # 10000.

Example 3

The magnetic head wrapping apparatus in this embodiment is the same as the first embodiment except that the magnetic head lapping motor 28 'for tilting the gonio stage 25 is necessarily provided. This motor 28 'is for rotating and vibrating the entire tape forming guides 20a and 11b.

The magnetic head wrapping method in this embodiment is the same as that of the first embodiment except that the tape forming guides 20a and 20b alternately incline between -0 and 0 as shown in FIG. 11 and FIG. same. The frequency of vibration was 2 Hz.

According to the magnetic head polishing apparatus of this embodiment, it is possible to improve the shape accuracy in the direction perpendicular to the traveling direction of the magnetic head by forcibly forming by using an abrasive tape forming guide and rotating vibration of the forming guide. It is possible to easily process a machining shape having a good contact state.

In addition, in the above-described embodiment, an example in which the tape forming guide is rotated and vibrated is shown. However, the tape forming guides are provided at predetermined intervals, and the upper and lower tape forming guides are disposed in the same direction and at the same time perpendicular to the rotational direction of the magnetic head. The same effect can be obtained when polishing by giving a vibration amplitude or when polishing by giving a small vibration amplitude in the direction opposite to each other and perpendicular to the rotational direction of the magnetic head.

The magnetic head lapping method and apparatus of the present invention may utilize the prior art knowledge in the art, except that the tape forming guide is provided and the abrasive tape is held on the tape guide cylinder.

In the above figures, the same reference numerals and numerals indicate the same parts.

As can be seen from the above description, according to the present invention, the shape instability of the magnetic head tape slide surface can be reduced, and the shape thereof can also be made desired.

Claims (13)

Guide the polishing tape 1 running on the outer circumferential surface of the pair of tape guide cylinders 11a, 11b facing the axial direction at a predetermined interval δ, and on the outer circumferential surface of the tape guide cylinder. In the method of polishing the tape slide surfaces of the magnetic heads 40, 40a, and 40b, which protrude a predetermined amount [Delta] t and held in the gap, with the running magnetic tape, by the outer circumferential surface of the tape guide cylinder. A tape forming guide portion 20a having a cylindrical inner surface of the upper outer peripheral surface and the lower outer peripheral surface in the width direction of the magnetic tape except for a portion of the magnetic tape that faces the tape slide surface of the magnetic head. And a tape slide surface of the magnetic head while pressing on the tape guide cylinder in 20b). The magnetic head wrapping method according to claim 1, wherein the tape forming guide portion comprises a pair of tape forming guides (20a, 20b) opposed at predetermined intervals (D). The magnetic head wrapping method according to claim 1, wherein the abrasive tape is pressed against the tape guide cylinder by ejecting a gas from a cylindrical inner surface of the pair of tape forming guides. The magnetic head wrapping method according to claim 1, wherein the tape slide surface of the magnetic head is polished while vibrating the pair of tape forming guides. 5. The magnetic head wrapping method according to claim 4, wherein the vibration is a rotational vibration having a center in a plane passing through the center in the thickness direction of the head chip (40a) of the magnetic head. The tape guide cylinder portion in which two sets of tape guide cylinders 11a and 11b having the same outer diameter face each other in the axial direction at predetermined intervals δ and are freely supported on the same axis in rotation, the tape guide The head holder cylinder 30 which supported relative rotation to the same axis as the said tape guide cylinder in the one tape guide cylinder 11b of the cylinder part, and the said head holder cylinder by the forward rotation and the reverse rotation direction at predetermined time intervals. There is a drive unit 31 which can be rotated alternately, a tape traveling system capable of driving the polishing tape 1 along the outer circumferential surface of the tape guide cylinder, and the magnetic heads 40, 40a, 40b within the gap. A magnetic head having means for attaching its tip to the outer circumferential surface of the tape guide cylinder at a position protruding by a predetermined amount? A lapping apparatus comprising: a pair of two sets having a cylindrical inner surface for pressing the polishing tape at a predetermined angle α on an outer circumferential surface of the tape guide cylinder, and facing each other at a predetermined interval D in the axial direction. Magnetic head wrapping device having a tape forming guide (20a, 20b). The magnetic head lapping apparatus according to claim 6, wherein the abrasive tape pressing surface p of the tape forming guide is formed of a resin having a low coefficient of friction. A slit (43a, 43b) for ejecting gas to the abrasive tape pressing surface (p, p ') of the tape forming guides (20a, 20b, 20a', 20b ') is provided. Magnetic head wrapping device provided. The two brake rollers (9a) according to any one of claims 6 to 8, wherein the two brake rollers (9a) are joined to the outer circumferential surface of the tape guide cylinder to rotate the tape guide cylinder in synchronism with the running of the polishing tape. Magnetic head wrapping device provided with 9b). The magnetic head wrapping apparatus according to claim 6, further comprising a tape running system support (15) for stepping the polishing tape by a predetermined distance in a direction perpendicular to the traveling direction thereof. The magnetic head wrapping apparatus according to claim 6, wherein the tape forming guide has a means for rotating and vibrating about the inside of the plane passing through the center in the thickness direction of the magnetic head chip (40a). 12. The magnetic head wrapping apparatus according to claim 11, wherein the rotation oscillating means comprises a gonio stage (25) and a gonio stage inclination motor (28 ') for tilting it. In a cross section perpendicular to the tape travel direction in an area within 0.2 mm of the tape travel direction in the working gap 50 of the magnetic head chip 40a, the chip is perpendicular to the center line in the thickness direction of the chip and simultaneously joined to the tip of the chip. The magnetic head having a value of | ab | is 0.1 μm or less when the distance between the tangent line and the first and second points on the tape slide surface 0.05 mm away from each other at right angles to the center line is a and b, respectively.

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