JPH05174323A - Magnetic head - Google Patents

Abstract

(57) [Abstract] [Purpose] To realize a magnetic head in a guard bandless recording magnetic recording device by helical scanning, in which crosstalk from adjacent and adjacent tracks, which is a problem for improving recording density, is reduced. [Structure] On the side surface of the head gap 102 of the magnetic head,
By arranging the magnetic bodies 103 and 106 so as not to cover the winding portion, it is possible to prevent the magnetic flux from jumping from the adjacent track,
Reduce cross stroke.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has been recently applied to a magnetic tape for reducing crosstalk in order to improve the recording density of a device such as a video tape recorder (VTR) or a dynamic address conversion (DAT) which performs guard band recording by helical scanning. It is about the head.

[0002]

2. Description of the Related Art FIG. 3 shows the structure of a conventional magnetic head. In FIG. 3, 301 and 302 are glass substrates, 303 is a magnetic core layer, and a gap 304 is formed at the center of the magnetic core layer 303. A window 305 is formed behind the gap 304, and a conductive wire 306 is wound around the window and the side wall of the magnetic head. The magnetic head is in contact with the magnetic tape that is the recording medium at the gap 304. Conductor 306 when writing signals
Apply a signal current to. A magnetic field is generated in the magnetic core layer 303 by the electric current, but since the magnetic core layer 303 is cut by the gap 304, the magnetic flux leaks there and the magnetic tape in contact with the gap 304 is magnetized. By moving this magnetic head on the magnetic tape in a direction perpendicular to the gap and changing the signal current, a signal can be recorded as continuous residual magnetization on the magnetic tape. This linearly continuous remanent magnetization is called a recording track. Conversely, when reading a signal, the recording track on the magnetic tape is traced by the magnetic head. The remanent magnetization on the tape changes the magnetic field in the magnetic core layer 303 through the gap 304, and as a result, an electromotive force is generated in the conductive wire 306 wound around the magnetic core. The signal thus written can be electrically read. FIG. 4 shows the positional relationship between the magnetic head and recording tracks on the magnetic tape. In FIG. 4, 401 is a magnetic head, 402, 403, 404,
405 is a recording track. There is a method of providing a gap (guard band) between recording tracks in order to prevent signal leakage (crosstalk) from adjacent recording tracks, but in a home VTR and DAT, a signal is recorded at a high density in a head recorder. Using two cables, the angle between each head gap and the recording track (azimuth angle) is set to a different value, and the crosstalk is at a level that poses no practical problem due to the loss (azimuth loss) due to the difference in azimuth angle. Has been.

[0003]

In recent years, advances in magnetic tapes and magnetic heads have made it possible to obtain a sufficient output for recording / reproduction with a narrower recording track width. When recording / reproducing on a narrow track, if the head width is reduced in proportion to the track width, the ratio of the reproduction signal of the main track and the crosstalk signal from the adjacent track can be kept the same. However, if the mechanism accuracy is not improved due to the reduction in the head width, the head is likely to deviate from the main track. Therefore, the head width cannot be narrowed so much that crosstalk becomes a problem. It is known that the output decreases when the azimuth angle is increased to reduce the crosstalk, and a crosstalk reduction method other than azimuth loss is required. The present invention solves the above conventional problems, and an object of the present invention is to provide a magnetic head with reduced crosstalk.

[0004]

In order to achieve the above object, the magnetic head of the present invention is one in which a magnetic material is arranged on the side surface of the head gap with a length that does not cover the winding portion.

[0005]

Therefore, according to the present invention, by disposing the magnetic substance on the side surface of the head gap, it is possible to prevent the magnetic flux from the adjacent track from jumping into the side surface of the head gap, and reduce the crosstalk.

[0006]

1 is a structural view of a magnetic head in one embodiment of the present invention, which is a view of the shielded magnetic head as seen from the tape side. FIG. 2 is a side view of a general magnetic head used in a helical scan type magnetic recording device such as a VTR or DAT. In FIG. 1, 101
Is a core material, 102 is a head gap, and 103 and 106 are magnetic materials, which are formed by providing non-magnetic materials 104 and 105 on both side surfaces of the core material 101. As a result, the magnetic bodies 103 and 106 serve as a magnetic shield. In FIG. 2, 201 and 202 are core materials,
203 is a gap spacer for forming a gap, 204
Is a window for winding, 205 is a bonding glass for protecting the finely processed gap and window, and 206 is a winding.
From the tip of the head to the bonding glass 205 (broken line 207
If the upper part) is covered with a magnetic material using a method such as sputtering, it becomes a magnetic shield to prevent the magnetic flux from jumping in from adjacent tracks and reduce crosstalk.

[0007]

As is apparent from the above-described embodiment, the present invention arranges a magnetic material on the side surface of the head gap of the magnetic head in such a length that it does not cover the winding portion, so that the side surface of the head gap is separated from the adjacent track. It has the effect of preventing the magnetic flux from jumping in and reducing crosstalk.

[Brief description of drawings]

FIG. 1 is a structural view of a shielded magnetic head according to an embodiment of the present invention as viewed from the tape side.

FIG. 2 is a side view of a general magnetic head used in a helical scan type magnetic recording device.

FIG. 3 is a structural diagram of a conventional magnetic head.

FIG. 4 is a diagram showing a positional relationship between a conventional magnetic head and recording tracks on a magnetic tape.

[Explanation of symbols]

101, 201, 202 ... Core material, 102 ... Head gap, 10
3, 106 ... Magnetic material, 104, 105 ... Non-magnetic material, 203 ... Gap space, 204 ... Winding window, 205 ... Bonding glass, 206, 306 ... Conductive wire, 301, 302 ... Glass substrate, 303 ... Magnetic core Layer, 304 ... Gap, 305 ...
Window, 401 ... Magnetic head, 402, 403, 404, 405 ... Magnetic track.

Claims (1)

[Claims] 1. A magnetic head in which a magnetic material is arranged on the side surface of the head gap with a length that does not cover the winding portion.