JP2568276B2 - Method and apparatus for polishing sliding surface of magnetic head tape - Google Patents

Description

The present invention relates to a magnetic head polishing method, and more particularly to a magnetic head tape sliding surface polishing method.

[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. Conventionally, a magnetic head polishing apparatus used for such work is disclosed in, for example, Japanese Patent Laid-Open No. 55-101130.
As disclosed in the publication, a magnetic head is attached to a rotating body and is rotated at a predetermined speed, and an abrasive tape is spirally wound along the outer peripheral surface of the tape guide cylinder so that the abrasive tape is wound in one direction. Therefore, the magnetic head is attached so as to slightly project from the tape guide cylinder, and the contact surface with the polishing tape is 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.

[Problems to be Solved by the Invention]

However, in the above-mentioned conventional technique, no consideration is given to the method of adjusting the protrusion amount and the apparent tape rigidity when the magnetic head is attached to the rotating body and protrudes from the rotating cylinder, and the curvature in the thickness direction of the magnetic head is not considered. Difference between the center of and the magnetic headgear center position, that is,
There are large variations in accuracy such as the amount of eccentricity, the radius of curvature in the tape running direction, and the radius of curvature in the thickness direction of the magnetic head, and the output characteristics may not be satisfied due to poor contact of the magnetic head with the magnetic tape. The time loss of polishing was large.

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

7 to 10 are explanatory views of a conventional method for polishing a sliding surface of a magnetic head tape. 1 is a magnetic head (1a is a magnetic head base, 1b is a head chip), 2 is a polishing tape, and 3a and 3b are tape guide cylinders. ing. During the operation by this polishing method, the polishing tape 2 moves in the vertical direction due to variations in contact resistance between the polishing tape 2 and the guide tube, variations in tape tension, variations in contact resistance between the magnetic head 1 and the polishing tape 2, etc. A position error occurs in the magnetic head 1 with respect to the center 0 of the width W of 2. Therefore, when the magnetic head 1 is above the center 0 of the polishing tape 2, as shown in FIG. 8, the center of the convex shape is above the center of the magnetic head 1 in the width direction, When the magnetic head 1 is below the center 0 of the polishing tape 2, the center of the convex shape is often lower than the center of the magnetic head 1 in the width direction, as shown in FIG. As shown in FIG. 10, the proportion of obtaining a predetermined shape was small and the variation was large.

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

[Means for solving the problem]

The main structure of the present invention, which has been adopted to solve the above-mentioned problems, is a method for polishing a sliding surface of a magnetic head tape, in which the outer peripheral surfaces of a pair of tape guide cylinders facing each other with a predetermined gap are used. In the method of polishing the tape sliding surface of the magnetic head, which guides the tape and projects by a predetermined amount from the outer peripheral surface of the tape guide cylinder, with the polishing tape, with respect to the position of the magnetic head on the outer peripheral surface of the polishing tape. The tape heads of the magnetic head are opposed to each other with a predetermined gap. A magnetic head in which an abrasive tape is guided by the outer peripheral surfaces of a pair of tape guide cylinders, and a predetermined amount is projected from the outer peripheral surfaces of the tape guide cylinders and held. In a device for polishing a tape sliding surface with the polishing tape, a work support unit that is rotatable in synchronization with the feed speed of the polishing tape and that detachably holds at least one magnetic head, and the work support unit. At a predetermined interval with respect to the magnetic head position on the outer peripheral surface of the polishing tape running on the outer peripheral surface of the tape guide cylinder. A tape forming guide to be pressed against and a means for swinging the tape forming guide about a plane passing through the center of the magnetic head in the thickness direction. is there.

[Action]

In the present invention, the protrusion amount of the magnetic head can be measured in a non-contact manner by the work supporting portion, and the protrusion amount of the magnetic head from the tape guide cylinder can be attached so as to be constant, so that a predetermined traveling direction radius Rx can be obtained. And a right-angled radius 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.
By setting the distances W _a and W _b between the magnetic heads 2a and 22b to predetermined positions, the shape accuracy of the magnetic head 1 in the direction perpendicular to the traveling direction and the center of the magnetic headgear and the direction of the magnetic head 1 are orthogonal. Direction difference in the direction of travel Rx, that is, the shape accuracy such as the amount of eccentricity is improved, and the tape forming guides 22a and 22b are attached to, for example, the magnetic head 1.
Rotate and oscillate in the same plane as. That is, the shape when the tape forming guides 22a and 22b are inclined by θ is
As shown in FIG. 12, it is convex downward, and when the tape forming guide is inclined by −θ, the shape is convex upward as shown in FIG. Therefore, by continuously repeating the tape forming guides 22a and 22b from −θ to θ, a combined shape of the shapes shown in FIGS. 12 and 13 can be obtained. Shape accuracy in the thickness direction is improved.

〔Example〕

 Examples of the present invention will be described below.

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

As shown in FIG. 5, in the tape running system, a polishing tape supply reel 5 and a polishing tape take-up reel 6 are arranged on a tape running system support 4. Between these two reels,
The polishing tape 2 is mounted. The polishing tape 2 is fed from the polishing tape supply reel 5, passes between the pinch roller 7a and the capstan roller 8a, passes through the impedance roller 9a, the guide roller 10a, the tape guide cylinder 3a, 3b, guide roller 10b, impedance roller 9b, pinch roller 7b,
The capstan roller 8b travels in this order and is wound up on the polishing tape winding reel 6. In addition, the guide rollers 10a, 10b
As described below, the tape guide cylinder 3
It moves to the position shown in FIG. 2 so as to have a predetermined winding angle on a and 3b, and moves to the position shown in FIG. 3 at the processing preparation stage and at the end. Brake rollers 11 are attached to the tape guide cylinders 3a and 3b so as to contact the outer circumferences thereof. The pinch roller drive motor 12 is coupled to the pinch roller 7b on the polishing tape feeding side, so that the pinch roller 7b rotates in synchronization with the rotation of the pinch roller 7b.
The pinch roller 7a, the polishing tape take-up reel 6, and the brake roller 11 on the polishing tape supply side are pulleys 13a, 13b, 13c, 13
d, connected by timing belts 14a, 14b, 14c. The tape traveling system support base 4 can be driven in the vertical direction by a step motor (not shown).

Next, the structure of the main part will be described with reference to FIGS.

The cylinder drive is a head holder cylinder 16 held by a bearing 15b in the tape guide cylinder 3b.
Is mounted on the head holder cylinder 16 and at least one magnetic head base 1a having a head chip attached to the head holder cylinder 16 is protruded from the outer periphery of the tape guide cylinder 3b by a predetermined amount and is held in a freely attachable manner. To the head holder cylinder 16, a head holder cylinder rotating shaft 17 and a head holder cylinder driving motor 18 having a conical tip of a shaft are connected. A tape guide cylinder of the same diameter as the tape guide cylinder 3b held by a bearing 15a in the head holder cylinder holding shaft 19 from above in the center of the head holder cylinder 16.
3a is lowered and tape guide cylinder with a predetermined interval
Combined with 3b. 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 head base 21 (the drive 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.

A tape forming guide is provided on the outer peripheral portion of the polishing tape 2.
22a and 22b are in contact. Tape forming guide 22
a and 22b adjust the tape forming guide intervals W _a and W _b to adjust the contact state of the tape forming guide interval fine adjustment stage 23 and the tape forming guide interval fine adjustment knobs 24a and 24b and the tape forming guides 22a and 22b. The adjusting knobs 25a and 25b, the tape forming guides 22a and 22b, and the Z table 26 for aligning the magnetic head 1 in the thickness direction, and the Z table height adjusting knob 27 and the tape forming guides 22a and 22b are pressed against the polishing tape 2. X table 28 and pressurizing cylinder 29, tape forming guide 2
It is composed of a goniometer stage 30 for rotating and swinging the whole 2a, 22b and a goniometer stage tilting motor 31 for tilting the goniometer stage 30.

Next, the operation will be described. Head holder cylinder
Head base 1a with unprocessed head chip 1b fixed to 16
As shown in FIG. 1, a predetermined head is fixed to the protruding amount, mounted on the head holder rotating shaft 17, and the tape guide cylinder vertical feed head 20 is lowered to make the tape guide cylinder 3a move to the tape guide cylinder 3b. Combine. Next, attach the brake roller 11 to the tape guide cylinder 3a.
Contact. The guide rollers 10a, 10b are moved in the direction of the arrow in FIG. 3 to move the polishing tape 2 to the tape guide cylinders 3a, 3
The polishing tape 2 is wound around the polishing tape winding reel 6 by winding it around b at a predetermined angle and rotating the pinch roller drive motor 12. A constant tension is applied by the winding of the polishing tape 2, and the tape forming guides 22a and 22b are set to a predetermined tape forming guide interval and moved forward by the pressure cylinder 29, and the tape guide cylinder 3a. , 3b with a predetermined pressure. Next, the head holder driving motor 18 starts rotating at a predetermined high speed. The head holder driving motor 18 rotates the head holder cylinder 16 in the forward rotation direction and the reverse rotation direction by a predetermined time by a preset timer. on the other hand,
The tape forming guides 22a and 22b are shown in FIG. 12 and FIG.
As shown in FIG. 3, the angle between −θ and θ is alternately tilted.
The head holder driving motor 18 is normally and reversely rotated because the contact pressure with the polishing tape 2 on the inflow side of the polishing tape 2 (the front surface in the rotating direction of the magnetic head) is high, and thus the processing amount is large (processing amount). (Q) ∝Velocity (v) × Pressure (P) × Coefficient (c)) Therefore, by rotating in the reverse direction, the center of the magnetic head can be uniformly processed into an arc shape.
This is common in polishing tape processing.
When the head holder cylinder 16 finishes the forward / reverse polishing, the tape forming guides 22a, 22b retract, the guide rollers 10a, 10b retract to the positions shown in FIG. 3, the pinch roller drive motor 12, the head holder cylinder. The drive motor 18 also stops. Further, the tape guide cylinder vertical feed head 20 rises, the head holder cylinder 16 and the tape guide cylinder 3b are taken out, and a series of operations is completed.
In this case also, in order to improve the efficiency, it is the same in this case that the roughness of the polishing surface is improved by using a fine polishing tape in order from a coarse polishing tape. That is, the above-mentioned combination of the polishing tape and the tape forming guide is used as a unit, and, for example, three types of units are provided for roughing, medium and finishing. 8000, in the finishing unit, # 10000 is used, and between each unit, the head holder cylinder 16 and the tape guide cylinder 3b portion is used by using a conveying means.
The head holder cylinder driving shaft 17 may be loaded and unloaded on the head holder cylinder driving shaft 17, and the above operation may be sequentially repeated to carry out polishing.

According to the magnetic head polishing apparatus of this embodiment, the polishing tape forming guide is used to force the forming, and the forming head is rotated and oscillated to obtain the shape accuracy in the direction perpendicular to the running direction of the magnetic head. Therefore, it is possible to easily form a processed shape in which the magnetic head and the magnetic tape are in good contact with each other.

In the above-described embodiment, the example in which the tape forming guides are rotated and oscillated is shown. However, the tape forming guides are installed at predetermined intervals, and the upper and lower tape forming guides are simultaneously moved in the same direction and the magnetic head is rotated in the same direction. The same effect can be obtained when polishing is performed by applying a small vibration amplitude in the direction perpendicular to the direction, or when polishing is performed in the opposite directions at the same time by applying a small vibration amplitude in the direction perpendicular to the rotating direction of the magnetic head. it can.

〔The invention's effect〕

INDUSTRIAL APPLICABILITY The present invention can provide a polishing method and apparatus that reduce variations in the shape of the tape sliding surface of the magnetic head in the step of polishing the tape sliding surface of the magnetic head, and have a great industrial effect. is there.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part of an embodiment of an apparatus for polishing a magnetic head tape sliding surface according to the present invention, and FIGS. 2 and 3 are plan views of the essential part in different states of the essential part of FIG. , 4th
1 is a perspective view of the main part of FIG. 1, FIG. 5 is a perspective view of the same tape running system, FIG. 6 is an explanatory view showing the relationship between the protrusion amount of the magnetic head and the shape accuracy, and FIG. FIG. 8 is an explanatory view showing the positional relationship between the polishing tape, the tape guide, and the magnetic head in the method of polishing the sliding surface of the magnetic head tape, and FIGS. 8 and 9 are explanatory diagrams when the center of the polishing tape and the magnetic head are misaligned. , FIG. 10 is an explanatory view showing the shape of the machined surface in the same good machining condition, FIG. 11 is an explanatory view of the main parts of FIG. 1, and FIGS. 12 and 13 are the main parts of FIG. 1 respectively. It is explanatory drawing in a different state. 1 ... magnetic head, 1a ... magnetic head base, 1b ... head chip, 2 ... polishing tape, 3a, 3b ... tape guide cylinder, 22a, 22b ... tape forming guide, 2
3 …… Tape forming guide spacing fine adjustment stage, 26
…… Z table, 28 …… X table, 30 …… Gonio stage.

Claims (7)

(57) [Claims] 1. A tape sliding surface of a magnetic head in which a polishing tape is guided by the outer peripheral surfaces of a pair of tape guide cylinders which face each other with a predetermined gap, and which protrudes and holds a predetermined amount from the outer peripheral surface of the tape guide cylinder. In the method of polishing with a polishing tape, a tape forming guide, which faces 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, comprising: 2. A pair of the tape forming guides, which are installed at a predetermined interval, are rotatably oscillated around a plane passing through the center of the magnetic head in the thickness direction and polished. The method for polishing a sliding surface of a magnetic head tape according to item 1. 3. A pair of said tape forming guides, which are installed at a predetermined interval, are ground by applying a minute vibration amplitude in the same direction and in a direction perpendicular to the rotating direction of said magnetic head. The method for polishing a sliding surface of a magnetic head tape according to item 1. 4. The polishing according to claim 1, wherein a pair of the tape forming guides arranged at a predetermined interval are ground in a direction opposite to each other and at a right angle to the rotational direction of the magnetic head by giving a minute vibration amplitude. 7. A method for polishing a sliding surface of a magnetic head tape according to the item. 5. A tape slide of a magnetic head by guiding an abrasive tape by the outer peripheral surfaces of a pair of tape guide cylinders facing each other with a predetermined gap, and projecting and holding the abrasive tape by a predetermined amount from the outer peripheral surfaces of the tape guide cylinders. In a device for polishing a surface with the polishing tape, a work support unit that is rotatable in synchronization with the feed rate of the polishing tape and that detachably holds at least one or more magnetic heads is rotated in forward and backward directions at predetermined time intervals. A cylinder drive portion that rotates at a high speed while reversing the tape guide tape, and a tape forming guide that is pressed against the outer peripheral surface of the polishing tape running on the outer peripheral surface of the tape guide cylinder at a predetermined interval with respect to the magnetic head position. And means for swinging and swinging the tape forming guide around a plane passing through the center of the magnetic head in the thickness direction. The polishing apparatus of the magnetic Hetsudotepu sliding surface to. 6. The tape forming guide adjusts a tape forming guide interval by adjusting a tape forming guide interval fine adjusting stage and a tape forming guide interval fine adjusting knob, and an adjusting knob adjusting a contact state of the tape forming guide. A Z table for adjusting the thickness direction of the tape forming guide and the magnetic head and a Z table height adjusting knob, an X table and a pressure cylinder for pressing the tape forming guide against the polishing tape, The magnetic head tape sliding surface according to claim 5, comprising a goniometer for rotating and swinging the entire tape forming guide and a goniometer tilting motor for tilting the goniometer. Polishing equipment. 7. The polishing apparatus for a magnetic head tape sliding surface according to claim 5, wherein the magnetic head is a VTR magnetic head.