JPH10269513A - Recording head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely make the butting of the gap tip of a tip recording track side by cutting the side surface on the tip recording ]track side of a head so that the surface crosses the gap, reducing the width of the side surface of the core on an opposite side in the vicinity of the gap and cutting and forming the side surface of the head on the opposite side of the track side at the place which does not crosses the gap. SOLUTION: The recording head is used for the system which employs guard bandless recording system. The side surface on the tip recording track side of a head 1 is cut and formed so that the surface crosses a gap 3. The width of the side surface of a core 5 on the opposite side of the tip recording track side is reduced in the vicinity of the gap 3. The side surface of the head on the opposite side of the tip recording track side is cut and formed at the place which does not cross the gap 3. Thus, there exists no deviation in the butting at the gap tip on the tip recording track side and no side fringe is generated caused by the deviation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recorder and a V
The present invention relates to a recording head used in a recording / reproducing apparatus such as a TR.

[0002]

2. Description of the Related Art A head used for recording is disclosed in JP-A-4-10.
As shown in FIG. 2 of JP-A-5208, in order to concentrate the magnetic flux in the gap by the core drawing effect, both sides of the core are narrowed and narrowed near the gap, and the side of the head is formed with the gap. Where they did not intersect, they were formed by cutting.

[0003]

FIG. 5 shows a conventional example of a head. At approximately the center of the sliding surface of the head with the tape, a gap for recording and reproducing on the tape is formed. Hereinafter, the longitudinal direction of the head is referred to as a head width, and the shorter direction is referred to as a head core thickness.

In recent years, as the recording capacity has increased, there have been many systems employing guard bandless recording in which there is no guard band (a gap area where no signal is recorded) between recording tracks. FIG. 6 shows the arrangement of recording tracks on a tape by guard band recording, and FIG. 7 shows the arrangement of recording tracks on a tape by guard bandless recording. In the case of guard bandless recording, a recording track is recorded by overwriting a part of a previously recorded track (hereinafter abbreviated as a prerecorded track).

At the time of overwriting, side fringing of a head to be recorded later becomes a problem. The side fringe means that the magnetic flux leaks and the leaked magnetic field is recorded on the side of the recording track at an azimuth angle different from the set azimuth angle. The longer the gap deviation at the gap end, the larger the side fringe. FIG. 8 shows a recording track and side fringes on the tape, and FIG. 9 shows an enlarged view of the gap. As shown in FIG. 9, a portion protruding due to the shift and a wide-angle portion facing the portion form a pseudo gap, and a signal is recorded.

This side fringe area is overwritten on the previous recording track and has a different azimuth angle.
The read head cannot read enough. The side fringe area becomes a guard band that is not useful for recording and reproduction, and the width of the recording track becomes narrower. When the width of the recording track becomes narrower, the reproduction output of the head decreases, causing an error rate of a reproduction signal and a deterioration in reproduction image quality.

Next, a description will be given of a process of occurrence of misalignment of a gap end in a head manufacturing process. After the head is aligned with the gap, the two core blocks are joined and integrated, and thereafter, the core block is cut into a plurality of heads.
As shown in FIG. 10, track width regulating grooves for regulating the gap and the track width are alternately formed on the gap forming surface in the core block. As shown in FIG. 11, in the head, after adjusting the gap position, the two core blocks are joined and integrated, and thereafter, this is cut into a plurality of heads. The dimensional relationship between the gap of the core block and the track width regulating groove varies within a certain intersection during manufacturing. In order to abut each other, a gap occurs at the gap end due to the variation within the above dimension intersection and the accuracy of the abutment.

[0008]

According to the present invention, there is provided a recording head used in a system using a guard bandless recording method, wherein a side surface of a head on a recording track side intersects a gap. It is formed by cutting, and the side of the core opposite to the pre-recording track side is narrowed by constricting near the gap, and the side of the head opposite to the pre-recording track side is cut where it does not intersect with the gap. Formed.

By forming the gap end by cutting, not by abutting, there is no abutting deviation at the gap end on the pre-recording track side, and no side fringe due to this is generated.

[0010] Further, when cutting both sides of the head so as to intersect with the gap, since there is no squeezing effect of the core, the recording performance is reduced, and the physical strength and abrasion resistance of the head are also deteriorated. FIG. 12 shows an experimental result on the wear resistance. This is a change in the amount of wear of the gap portion of the head due to the tape running time. The greater the amount of wear, the lower the wear resistance.

[0011]

FIG. 1 is a plan view of a head according to the present invention. As an example, in a recording head used in a system using the guard bandless recording method, the side of the head 1 on the side of the previous recording track has a gap 3
The core 5 on the side opposite to the pre-recording track side is constricted to a narrow width near the gap 3 so as to intersect with the head 1 on the side opposite to the pre-recording track side.
Was cut at a place where it did not intersect with the gap 3.

The constricted portion is filled with glass 4 in order to maintain the physical strength of the head 1.

As an embodiment, an oxide magnetic substrate is used as a holding material, and an alloy soft magnetic material made of an amorphous alloy or the like is arranged near the gap 3 to increase the saturation magnetic flux density. It may be five. The holding material has better wear resistance than the alloy soft magnetic material.

FIG. 2 is a plan view of a head according to the present invention, and FIG.
Is a side view thereof. As an example, in a recording head used in a system using a guard bandless recording method, the gap 3 on the previous recording track side of the head 1 is used.
A non-magnetic film 8 is formed so as to intersect with the end, and the side surface of the core 5 on the side opposite to the pre-recording track side is narrowed by constricting near the gap 3. The side surface of the head 1 was formed by cutting at a position not intersecting with the gap 3. FIG. 4 shows the manufacturing method. A groove 10 is formed so as to intersect with the end of the gap 3 on the recording track side of the core block 9.
D, formed by sputtering or the like. Then, it is processed into a head chip. Since processing is performed on one side, damage to the core during processing is reduced as compared with processing on both sides.

[0015]

According to the present invention, there is no misalignment at the gap end on the pre-recording track side, and no side fringing due to this is generated. As a result, a sufficient recording track width can be secured, and deterioration of the reproduction output can be prevented.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment.

FIG. 2 is a plan view showing the embodiment.

FIG. 3 is a side view showing the embodiment.

FIG. 4 is an explanatory view showing a head manufacturing method.

FIG. 5 is a plan view showing a conventional example.

FIG. 6 is a diagram showing an arrangement of recording tracks on a tape by guard band recording.

FIG. 7 is a diagram showing an arrangement of recording tracks on a tape by guard bandless recording.

FIG. 8 is an explanatory diagram showing recording tracks and side fringes on a tape.

FIG. 9 is an explanatory diagram of a gap.

FIG. 10 is an explanatory diagram of a core block.

FIG. 11 is an explanatory diagram of the joining of the core blocks.

FIG. 12 is an explanatory view showing an experimental result on abrasion resistance.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Head, 2 ... Tape, 3 ... Gap, 4 ... Glass, 5 ... Core, 6 ... Recording track, 7 ... Side fringe, 8 ... Film, 9 ... Core block, 10 ... Groove, 11 ... Guard band, 12 ... Track width regulating groove.

Claims (2)

[Claims] In a recording head used in a system using a guard bandless recording method, a side surface on a recording track side of the head is formed by cutting so as to intersect a gap, and a side opposite to the recording track side is formed. A recording head, wherein a side surface of a core is narrowed by constricting near the gap, and a side surface of the head opposite to the recording track is cut at a position not intersecting with the gap. 2. A recording head used in a system using a guard bandless recording method, wherein a non-magnetic film is formed so as to intersect a gap end on a recording track side of the head, and a non-magnetic film is formed on a side opposite to the recording track side. A recording head, wherein a side surface of a core is narrowed by constricting near the gap, and a side surface of the head opposite to the recording track is cut at a position not intersecting with the gap.