JPH0366026A - Magnetic head tape sliding surface polishing method and device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of polishing a magnetic head, and particularly to a method of polishing a sliding surface of a magnetic head tape.

[Conventional technology]

When manufacturing a magnetic head for a VTR (hereinafter referred to as a magnetic head), it is necessary to polish the tape sliding surface of the magnetic head. A magnetic head polishing device conventionally used for such work is, for example, disclosed in Japanese Patent Application Laid-Open No. 55-10
As disclosed in Japanese Patent No. 1130, a magnetic head is attached to a rotating body and rotated at a predetermined speed, and an abrasive tape is spirally wound along the outer circumferential surface of a tape guide cylinder.
It was designed to be wound in one direction, and the magnetic head was attached so as to protrude slightly from the tape guide tube, and the surface in contact with the polishing tape was polished. By doing so, it is possible to form a tape sliding surface having the same tape contact as that attached to an actual VTR.

[Problem to be solved by the invention]

However, the above-mentioned conventional technology does not consider how to adjust the amount of protrusion and the apparent tape rigidity when the magnetic head is attached to a rotating body and protrudes from the rotating cylinder. The difference between the center of curvature in the thickness direction and the center position of the magnetic head gap, that is, the amount of eccentricity, the radius of curvature in the tape running direction, the radius of curvature in the thickness direction of the magnetic head, etc., has large variations in accuracy, and the contact of the magnetic head with the magnetic tape. If the output characteristics are not satisfied due to defects or the like, re-polishing may be performed, resulting in a large time loss for polishing.

That is, the amount of protrusion of the magnetic head from the tape guide cylinder (hereinafter referred to as the amount of protrusion) is δ, the radius of the shape in the magnetic tape running direction (hereinafter referred to as the radius in the running direction) is Rx, and the radius of the shape in the direction perpendicular to the magnetic tape running direction (hereinafter referred to as the radius in the running direction) is δ. (referred to as the right-angle direction radius) is Ry, the relationship between these is as shown in FIG. This figure shows that as the protrusion amount δ increases, the radius Rx in the running direction tends to increase, and the radius Ry in the right angle direction tends to decrease.In order to improve the shape accuracy of the radius Rx in the running direction and the radius Ry in the right angle direction, This indicates that it is necessary to set the protrusion amount δ with high precision.

7 to 10 are explanatory diagrams of a conventional method of polishing the sliding surface of a magnetic head tape, in which 1 is a magnetic head (la is a magnetic head base, 1b is a head chip), 2 is a polishing tape, 3a, 3
b indicates a tape guide cylinder. During work using this polishing method, the polishing tape 2 moves vertically due to fluctuations in contact resistance between the polishing tape 2 and the guide tube, fluctuations in tape tension, fluctuations in contact resistance between the magnetic head 1 and the polishing tape 2, etc. A positional error occurs in the magnetic head 1 with respect to the center 0 of the width W of 2. Therefore, the center of the polishing tape 2 is 0.
8, when the magnetic head 1 is above, the center of the convex shape is upward with respect to the widthwise center of the magnetic head l, and with respect to the center O of the polishing tape 2, as shown in FIG. When the magnetic head 1 is at the bottom, as shown in FIG. 9, the center of the convex shape is often below with respect to the widthwise center of the magnetic head 1, The proportion of shapes obtained was low and the variation was large.

SUMMARY OF THE INVENTION An object of the present invention is to provide a polishing method and apparatus for reducing variations in the shape of a tape sliding surface of a magnetic head in a step of polishing the tape sliding surface of a magnetic head.

[Means to solve the problem]

The main structure of the present invention, which has been adopted to solve the above-mentioned problems, is that in a method for polishing a sliding surface of a magnetic head tape, a polishing tape is applied to the outer peripheral surface of a pair of tape guide cylinders facing each other with a predetermined gap. In the method of polishing, with the polishing tape, the tape sliding surface of a magnetic head held by protruding a predetermined amount from the outer circumferential surface of the tape guide cylinder, the polishing tape has a tape sliding surface on the outer circumferential surface of the polishing tape relative to the position of the magnetic head. A tape sliding surface polishing device for a magnetic head is characterized in that a pair of tape forming guides facing each other are pressed against each other at a predetermined interval, and the tape forming guide is vibrated for polishing. In an apparatus for guiding an abrasive tape on the outer circumferential surface of a cylinder and polishing the tape sliding surface of a magnetic head held by protruding a predetermined amount from the outer circumferential surface of the tape guide cylinder with the abrasive tape, the abrasive tape is fed. a work support part that is rotatable in synchronization with the speed and that detachably holds at least one magnetic head; and a cylinder drive part that rotates the work support part at high speed while reversing the work support part in forward and reverse directions at predetermined time intervals. a tape forming guide that is pressed against the outer circumferential surface of the abrasive tape running on the outer circumferential surface of the tape guide cylinder so as to face the magnetic head position at a predetermined interval; The device is characterized by having means for swinging one rotation around a plane passing through the center in the thickness direction.

[Effect]

In the present invention, the amount of protrusion of the magnetic head can be measured in a non-contact manner using the work support part, and the magnetic head can be mounted so that the amount of protrusion of the magnetic head from the tape guide cylinder is constant. The radius in the direction can be Ry.

Further, in order to keep the apparent tape rigidity in the width direction of the polishing tape constant, tape forming guides 22a and 22b are provided as shown in FIG. 11.

By setting the distances Wa and Wb between the tape forming guides 22a and 22b and the magnetic head 1 to predetermined positions, the shape accuracy in the direction perpendicular to the running direction of the magnetic head 1, the center of the magnetic head gap, and the running direction of the magnetic head 1 can be adjusted. The shape accuracy of the difference between the center and the center of the running direction radius Rx in the perpendicular direction, that is, the amount of eccentricity, is improved, and the tape forming guides 22a and 22b are rotated and oscillated within the same plane as the magnetic head 1, for example. That is, when the tape forming guides 22a and 22b are inclined by θ, the shape becomes convex downward, as shown in FIG.
As shown in Figure 3, it has an upwardly convex shape. Therefore, by continuously repeating the tape forming guides 22a and 22b from one θ to θ, the shapes shown in FIG. 12 and FIG. ) shape accuracy is improved.

〔Example〕

Examples of the present invention will be described below.

FIG. 1 is a vertical cross-sectional view of a main part of a cylinder drive section of a magnetic head polishing apparatus according to an embodiment, FIGS. 2 and 3 are plan views of main parts of the cylinder drive section in different states, and FIG. 4 is a cylinder drive section. FIG. 5 is a perspective view of the tape running system.

As shown in FIG. 5, the tape running system includes an abrasive tape supply reel 5 and an abrasive tape take-up reel 6 arranged on a tape running system support 4. A polishing tape 2 is mounted between the two reels, and the polishing tape 2 is fed out from the polishing tape supply reel 5, passes between the pinch roller 7a and the capstan roller 8a, and passes through the impedance roller 9.
a, guide roller 10a, tape guide cylinder 3
a, 3b, guide roller 10b, impedance roller 9b, pinch roller 7b, and capstan roller 8b in this order, and is wound up on a polishing tape winding wheel 6.

Also, a guide roller 10a.

10b is moved to the position shown in FIG. 2 so that the predetermined wrapping around the tape guide cylinders 3a and 3b is at a corner during processing, as will be described later. It will move to the indicated position. Tape guide cylinder 3a.

A brake roller 11 is attached to 3b so as to be in contact with its outer periphery. Pinch roller 7 on the polishing tape feeding side
A pinch roller drive motor 12 is coupled to b, and rotates in synchronization with the rotation of the pinch roller 7b.
The pinch roller 7a on the abrasive tape supply side, the abrasive tape take-up reel 6° brake roller 11, the pulley 13a,
13b.

13c, 13d, timing belts 14a, 14b.

14c. The tape running system support stand 4 can be driven in the vertical direction by a step motor (not shown).

Next, the structure of the main parts will be explained using FIGS. 1 to 4.

The cylinder drive unit includes a tape guide cylinder 3b in which a head holder cylinder 16 held by a bearing 15b is mounted, and at least one magnetic helad base 1a to which a head chip is attached to the head holder cylinder 16. It protrudes from the outer circumference by a predetermined amount and is held so that it can be freely attached. The head holder cylinder 16 includes a head holder cylinder rotating shaft 17 having a conical tip end;
A head holder cylinder driving motor 18 is coupled thereto. A bearing 15a is attached to the head holder cylinder holding shaft 19 from above at the center of the head holder cylinder 16.
The tape guide cylinder 3a, which is held by the tape guide cylinder 3b and has the same diameter as the tape guide cylinder 3b, is lowered and combined with the tape guide cylinder 3b at a predetermined interval. The tape guide cylinder 3a and the head holder cylinder holding shaft 19 are held by a tape guide cylinder vertical feed head 20 and a tape guide cylinder vertical feed base 21 (the opening mechanism is not shown).

A brake roller 11 that rotates the tape guide cylinder 3a in synchronization with the polishing tape 2 is in contact with the outer peripheral portion of the tape guide cylinder 3a.

Tape forming guide 2 on the outer periphery of polishing tape 2
2a and 22b are in contact. The tape forming guides 22a and 22b have a tape forming guide interval Wa.
= Tape forming guide interval fine adjustment stage 23 and tape forming guide interval fine adjustment knob 24a for adjusting Wb.

24b, adjustment knobs 25a, 25b for adjusting the contact state of the tape forming guides 22a, 22b, a Z table 26 for positioning the tape forming guides 22a, 22b and the magnetic head 1 in the thickness direction, and a Z table height adjustment knob 27. Tape forming guide 22a, 2
X table 28 for pressing 2b against the polishing tape 2
and pressurized cylinder 29. Tape forming guide 2
2a.

Goniometer stage 30 for rotating and swinging the entire 22b
and a gonio stage tilting motor 31 for tilting the gonio stage 30.

Next, to explain its operation, head holder cylinder 1
As shown in FIG. 1, the head base 1a to which the unprocessed helad tip 1b is fixed to the head base 1a is fixed to a predetermined head protrusion amount, and is mounted on the head holder rotation shaft 17, and the tape guide cylinder vertical feed head is attached to the head base 1a. 20 and move the tape guide cylinder 3a to the tape guide cylinder 3b.
Combine with. Next, the brake roller 11 is brought into contact with the tape guide cylinder 3a. Guide roller 10a.

10b in the direction of the arrow in FIG. 3 to wrap the abrasive tape 2 around the tape guide cylinders 3a, 3b at a predetermined angle, and at the same time rotate the pinch roller drive motor 12, the abrasive tape 2 is placed on the abrasive tape take-up reel 6. It is wound up. By winding up the abrasive tape 2, a certain tension is applied, and the tape forming guides 22a, 22 are set at a predetermined interval between tape forming guides.
The portion 2b is advanced by the pressure cylinder 29 and comes into contact with the tape guide cylinders 3a and 3b with a predetermined pressure.

Next, the head holder drive motor 18 starts rotating at a predetermined high speed. This head holder driving motor 18 rotates the head holder cylinder 16 in the forward rotation direction and the reverse rotation direction for a predetermined period of time using a preset timer. On the other hand, the tape forming guides 22a and 22b are
As shown in the figure and FIG. 13, the slope is alternately between -θ and θ. The reason why the head holder driving motor 18 is rotated forward and backward is that the contact pressure with the polishing tape 2 on the inflow side of the polishing tape 2 (the front surface in the direction of rotation of the magnetic head) increases, which increases the amount of processing (machining). Quantity (Q) Speed (
(v)×pressure (P)×coefficient (C)) Therefore, by rotating the magnetic head in the opposite direction, it is possible to uniformly process the magnetic head into an arc shape with respect to the center of the magnetic head. This is common in abrasive tape processing. When the forward and reverse polishing of the head holder cylinder 16 is completed, the tape forming guide 22a.

22b is retracted, the guide rollers 10a, 10b are retracted to the position shown in FIG. 3, and the pinch roller drive motor 12.
The head holder cylinder drive motor 18 also stops. Furthermore, the tape guide cylinder vertical feed head 20 rises,
Take out the head holder cylinder 16 and tape guide cylinder 3b and complete the series of operations 0 Normally, in order to improve efficiency, the roughness of the polished surface is improved by sequentially using coarse polishing tape and then finer polishing tape. It is. That is, a combination of the above-mentioned polishing tape and tape forming guide is used as a unit, and three types of units are provided, for example, rough, medium, and finishing, and the polishing tape is #4000 for the rough processing unit and #8000 for the medium finishing unit.゜In the finishing unit, the head holder cylinder 16 and the tape guide cylinder 3b portion are loaded and unloaded onto the head holder cylinder drive shaft 17 using #10000 and a conveying means between each unit. It is also possible to perform the polishing process by sequentially repeating the above operations.

According to the magnetic head polishing apparatus of this embodiment, forcible forming is performed using a polishing tape forming guide,
By oscillating the forming guide once, the shape accuracy in the direction perpendicular to the running direction of the magnetic head can be improved, so that a shape with good contact between the magnetic head and the magnetic tape can be easily formed.

In the above embodiment, an example was shown in which the tape forming guide was rotated and oscillated, but the tape forming guides were installed at a predetermined interval, and the upper and lower tape forming guides were moved simultaneously in the same direction. The same method applies when polishing by applying a minute vibration amplitude in a direction perpendicular to the direction of rotation of the magnetic head, or when polishing by applying a minute vibration amplitude in a direction perpendicular to the direction of rotation of the magnetic head simultaneously in opposite directions. effect can be obtained.

〔Effect of the invention〕

The present invention makes it possible to provide a polishing method and apparatus for reducing variations in the shape of the tape sliding surface of a magnetic head in the polishing process of the tape sliding surface of the magnetic head, and has great industrial effects. be.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a main part of an embodiment of a magnetic head tape sliding surface polishing apparatus of the present invention, and FIGS. 2 and 3 are plan views of the main part of the main part shown in FIG. 1 in different states. Figure, 4th
The figure is a perspective view of the main part of Figure 1, Figure 5 is a perspective view of the tape running system, Figure 6 is an explanatory diagram showing the relationship between the protrusion amount of the magnetic head and the shape accuracy, and Figure 7 is the conventional one. The relationship between polishing tape, tape guide, and magnetic head in the method of polishing the sliding surface of magnetic head tape! ! FIG. 8 is an explanatory diagram showing the relationship. Fig. 9 is an explanatory diagram of the case where the center of the polishing tape and the magnetic head are misaligned, Fig. 10 is an explanatory diagram showing the machined surface shape under good machining conditions, and Fig. 11 is a diagram showing the main part of Fig. 1. The explanatory diagrams, FIGS. 12 and 13, are also explanatory diagrams of the main parts of FIG. 1 in different states. l...Magnetic head, la...Magnetic head base, 1
b... Head chip, 2... Polishing tape, 3a, 3
b...Tape guide cylinder, 22a, 22b...
Tape forming guide, 23...Tape forming guide interval fine adjustment stage, 26...Z table,
28...X table, 30...gonio stage. Fig. 3 Fig. 1...Magnetic head 1a
・・・・・・・・・・・・Magnetic Radopace 1b
・・・・・・・・・・・・Magnetic tip 28
・・・・・・・・・・・・・・・X table 30...
・・・・・・・・・・・・Goniostage stage (Figure 6 Figure 7a Figure Figure 10 Figure 12 Figure 11 Figure 13

Claims (1)

[Claims] 1. An abrasive tape is guided by the outer circumferential surfaces of a pair of tape guide cylinders facing each other with a predetermined gap, and the tape of a magnetic head is held by protruding a predetermined amount from the outer circumferential surface of the tape guide cylinders. In the method of polishing a sliding surface with the polishing tape, a tape forming guide facing the position of the magnetic head at a predetermined interval is pressed against the outer peripheral surface of the polishing tape, and the tape forming guide is vibrated for polishing. A method for polishing a sliding surface of a magnetic head tape, characterized by: 2. A pair of tape forming guides installed at a predetermined interval are rotated and oscillated within a plane passing through the center of the magnetic head in the thickness direction for polishing. A method of polishing the sliding surface of a magnetic head tape. 3. A pair of tape forming guides installed at a predetermined interval are polished by applying a minute vibration amplitude in the same direction and in a direction perpendicular to the direction of rotation of the magnetic head. A method of polishing the sliding surface of a magnetic head tape. 4. Magnetism according to claim 1, wherein a pair of tape forming guides installed at a predetermined interval are polished by applying minute vibration amplitudes in directions opposite to each other and perpendicular to the direction of rotation of the magnetic head. A method of polishing the sliding surface of the head tape. 5. Guide the polishing tape on the outer peripheral surfaces of a pair of tape guide cylinders facing each other with a predetermined gap, and polish the tape sliding surface of the magnetic head held by protruding a predetermined amount from the outer peripheral surface of the tape guide cylinders. In an apparatus for polishing with a tape, a work support part that is rotatable in synchronization with the feed speed of the polishing tape and that removably holds at least one of the magnetic heads is rotated in forward and reverse directions at predetermined time intervals. A cylinder drive unit that rotates at high speed; a tape forming guide that is pressed against the outer circumferential surface of the abrasive tape that runs on the outer circumferential surface of the tape guide cylinder at a predetermined interval and opposed to the magnetic head position; and the tape forming guide. A polishing device for a magnetic head tape sliding surface, comprising means for rotating and oscillating the magnetic head within a plane passing through the center of the magnetic head in the thickness direction. 6. The tape forming guide includes a tape forming guide interval fine adjustment stage and a tape forming guide interval fine adjustment knob that adjusts the tape forming guide interval, an adjustment knob that adjusts the contact state of the tape forming guide, and a magnetism between the tape forming guide and the tape forming guide. A Z table and a Z table height adjustment knob for positioning in the thickness direction of the head, an X table and a pressure cylinder for pressing the tape forming guide against the polishing tape, and rotating and swinging the entire tape forming guide. 6. A polishing device for a magnetic head tape sliding surface according to claim 5, comprising a goniometer stage for tilting the goniometer stage and a goniometer stage tilting motor for tilting the goniometer stage. 7. The magnetic head tape sliding surface polishing apparatus according to claim 5 or 6, wherein the magnetic head is a magnetic head for a VTR.