JPH0775051B2 - Method of manufacturing magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention is a DAT (Digital Audio Tape Recorder).
The present invention relates to a method for manufacturing a magnetic head mounted in a magnetic recording / reproducing apparatus such as a computer, and more particularly, to a method for polishing a tape sliding surface of the magnetic head.

(B) Conventional Technology A magnetic head that records and reproduces information on and from a magnetic tape is required to obtain desired electrical characteristics as a magnetic head.
In the manufacturing process, the tape sliding surface is finished to have a predetermined surface roughness.

Conventionally, the polishing of the tape sliding surface of the magnetic head has been performed by the third method.
As shown in the figure, a plurality of magnetic heads b to be ground are fixed to the outer peripheral surface of a rotating drum a held rotatably, and a tape guide d, is attached to the tip of the magnetic head b rotated by the rotating drum a. This is done by running the polishing tape c that is pressed by d. In this case, the polishing tape c was also pressed against the surface of the rotary drum a at least either before or after sliding on the tip of the magnetic head b.

(C) Problems to be Solved by the Invention However, in the method of manufacturing a magnetic head as described in the prior art, the magnetic head b is moved by the rotating drum a from the position A in FIG. When the magnetic head b is rotated to the position E, the sliding state of the magnetic head b and the polishing tape c at each position is as follows.

That is, at the position A where the magnetic head b starts contacting the polishing tape c, the surface of the magnetic head b only on the rotational direction side is polished by the polishing tape c, and the polishing tape c is the magnetic head b.
Is in contact with the rotating drum a only on the side in the rotating direction of. Then, as the magnetic head b rotates from the position A to the position B, the sliding surface between the magnetic head b and the polishing tape c becomes
The magnetic head b moves simultaneously to the opposite side of the successive rotation direction.
The amount of winding around is increased.

When the magnetic head b comes to the position B, the polishing tape c presses the rotating drum a on both sides of the magnetic head b, and the sliding surface with the magnetic head b is almost symmetrical on both sides of the tip of the magnetic head b. It is formed. This state is maintained from the position of the magnetic head b to the position of D through the position of C.

Further, as the magnetic head b rotates from the position D to the position E, the sliding surface with the polishing tape c gradually moves toward the side opposite to the rotating direction and the winding amount thereof decreases. Then, at the same time when the magnetic head b passes the position E, the magnetic head b loses contact with the polishing tape c.

However, in such a polishing state, the main part of the polishing process is during the rotation of the magnetic head b from the position B to the position D, and the sliding of the magnetic head b and the polishing tape c during this period. The state is considered to be in a certain steady state having a substantially constant width L, as shown in FIG. When the width L of the sliding surface is very small, the tip end portion of the magnetic head b is polished best due to the bending rigidity of the polishing tape c. On the other hand, when the width L of the sliding surface is larger than a certain level, the peripheral portion of the sliding surface of the magnetic head b is polished best because of the bending rigidity of the polishing tape c.

As a result, in any case, the sliding surface of the magnetic head b causes uneven polishing such that the radius of curvature of the tip portion is larger than that of the peripheral portion thereof, and the magnetic tape c
However, there is a problem in that good slidability between the magnetic head b and the magnetic head b cannot be maintained.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method of manufacturing a magnetic head capable of preventing uneven polishing during tape polishing of the magnetic head b. Is.

(D) Means for Solving the Problems The present invention is a polishing method in which a polishing tape is slid on a magnetic head that is fixedly mounted on a rotary drum and is rotated to polish the sliding surface between the magnetic head and the magnetic tape. In the method, the polishing tape slid on the magnetic head is prevented from contacting the surface of the rotating drum on both sides of the tip of the magnetic head, and the sliding surface is moved from the surface on the rotational direction side of the magnetic head to the opposite surface. According to the method of manufacturing a magnetic head.

(E) Action When the rotating drum is rotated and the polishing tape is run, the sliding surface of the polishing tape with respect to the magnetic head is on the side of the rotating direction of the magnetic head because the polishing tape is not in contact with the rotating drum on both sides of the magnetic head. The surface of the magnetic head is constantly moved to the opposite surface to uniformly polish the tip of the magnetic head.

(F) Embodiments The present invention will be described in detail based on the embodiments shown in FIGS. 1 and 2. However, this does not limit the present invention.

In FIG. 1, reference numeral 1 denotes four magnetic heads fixed to the surface of a rotary drum 2, and a polishing tape 3 is pressed against the magnetic head 1 rotated with the rotary drum 2 by tape guides 4, 4. . The method of manufacturing a magnetic head according to the present invention is characterized in that the polishing tape 3 pressed by the magnetic head 1 is prevented from coming into contact with the surface of the rotating drum 2 on both sides of the magnetic head 1.

Next, a polishing step during which the magnetic head 1 on the rotary drum 2 rotates from the position F where it starts sliding in contact with the polishing tape 3a to the position I where it loses contact with the polishing tape 3d through G and H. Will be described with reference to FIG.

When the magnetic head 1 starts to contact the polishing tape 3a at the position F, the sliding surface between the magnetic head 1 and the polishing tape 3a is only on the rotational direction side of the magnetic head 1, and the polishing tape 3a contacts the rotating drum 2. It is only on the rotational direction side of the magnetic head 1. Then, as the magnetic head 1 rotates from the position F to the position G, the magnetic head 1 and the polishing tape 3b are rotated.
The sliding surfaces of and move from the rotation direction side of the magnetic head 1 to the opposite direction side while gradually increasing the area.

When the magnetic head 1 is rotated to the H position, the sliding surfaces of the magnetic head 1 and the polishing tape 3c are formed substantially symmetrically on the left and right sides of the tip of the magnetic head 1. At this time, the polishing tapes 3c on both the left and right sides of the magnetic head 1 have a diameter of the rotary drum 2 or tape guides 4 and 4 for the rotary drum 2.
Are held so as not to come into contact with the surface of the rotary drum 2 by means such as adjusting the relative position of. And
When the magnetic head 1 is rotated from the H position to the I position, the sliding surface between the magnetic head 1 and the polishing tape 3d is gradually reduced in its area and the opposite direction from the rotation direction side of the magnetic head 1. Move to the side.

In the series of polishing processes described above, the sliding surfaces of the magnetic head 1 and the polishing tapes 3a to 3d always move from the surface on the rotating direction side of the magnetic head 1 to the surface on the opposite side as the magnetic head 1 rotates. ing. Therefore, at a certain moment during polishing of the sliding surface of the magnetic head 1, the magnetic head 1 and the polishing tape
Even if a pressure distribution that causes uneven polishing of the magnetic head 1 is generated between the magnetic head 1 and the polishing heads 3a to 3d, the sliding surface between the magnetic head 1 and the polishing tapes 3a to 3d due to the rotation of the rotary drum 2 is Since the magnetic head 1 moves, the polished surface of the magnetic head 1 is finished into a smooth curved surface, and it is possible to reliably prevent occurrence of large uneven polishing.

(G) Effect of the Invention According to the present invention, since the tape sliding surface of the magnetic head can be polished without bringing the polishing tape into contact with the surface of the rotating drum, it has a smooth sliding surface and prevents uneven polishing. The magnetic head can be manufactured efficiently.

Moreover, since the magnetic head manufactured by the present invention having the above characteristics can maintain a good sliding state with the magnetic tape when recording / reproducing information on / from the magnetic tape, the magnetic tape is used. It is also possible to contribute to higher density and larger capacity of the magnetic recording / reproducing apparatus.

[Brief description of drawings]

FIG. 1 is a front view showing an example of an apparatus for carrying out the method of the present invention, and FIG. 2 is a detailed view showing a polishing process of the present invention.
FIG. 3 is a front view showing an apparatus for carrying out a conventional method, and FIG.
FIG. 5 and FIG. 5 are detailed views of the essential parts for explaining the problems of the conventional polishing method. 1 ... Magnetic head, 2 ... Rotating drum, 3, 3a-3d ... Abrasive tape.

Claims (1)

[Claims] 1. A polishing method in which a polishing tape is slid on a magnetic head that is fixedly rotated on a rotating drum to finish the sliding surface between the magnetic head and the magnetic tape. And a sliding surface is moved from the surface on the rotation direction side of the magnetic head to the opposite surface so that the polishing tape does not contact the surface of the rotating drum on both sides of the tip of the magnetic head. .