JPH02113410A - Multitrack magnetic head - Google Patents

Abstract

PURPOSE:To maintain crosstalks between heads extremely small by disposing plural head chips which diagonally crimp magnetic metallic cores on one base in such a manner that the track loci do not overlap on each other. CONSTITUTION:The magnetic metallic core 1 is crimped from both sides by nonmagnetic substrates 2 in such a manner as to be held diagonal with a head chip end face 7 to constitute the head chip. Such plural head chips are disposed on one head base 5 in such a manner that the loci of the respective tracks thereof do not overlap on each other and do not face each other at end faces 8, 9 of the chips adjacent to all the magnetic cores. Since the magnetic metallic cores 1 are formed diagonally with the end faces 7 in such a manner, the positions of the magnetic metallic cores at the end faces 8, 9 of the adjacent substrate are sufficiently parted in distance even if the head chips are in contact with each other. The crosstalks are thus maintained sufficiently small.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a multi-track magnetic head with low crosstalk and suitable for recording and reproducing at high signal rates.

2. Description of the Related Art In recent years, systems that handle wideband signals such as high-quality VTRs and digital VTRs have been actively developed.

In order to record and reproduce this wideband signal, research is being carried out on increasing the relative speed between the tape and the head and on creating multiple channels. For multi-channel recording and playback, one head mounting on a rotating cylinder requires multiple heads to be mounted in the window, and the protruding shape and shape of the heads must be adjusted to maintain uniform contact with the tape. Efforts have been made to optimize R in the track width direction.

Problems to be Solved by the Invention When a plurality of heads are mounted in a window on a rotary cylinder, the interval between the respective head chips should be as small as possible in order to ensure stable contact with the tape. However, when the distance between adjacent head chips is narrow, crosstalk between the heads becomes impossible to ignore. In particular, in the case of a ferrite head with a notch in the vicinity of the gap, the width at both ends of the head chip is wider than the track width, so crosstalk tends to increase.

Means for Solving the Problems A plurality of ring-shaped magnetic heads each having a head chip having a configuration in which a metal magnetic core is sandwiched from both sides by non-magnetic substrates so as to be oblique to the end surface of the head chip, and the plurality of head chips are provided. are arranged on one head base so that the tracks of the respective tracks do not overlap each other and the metal magnetic cores do not face each other at the end surfaces of adjacent chips.

Effect According to the above configuration, by using a metal magnetic core sandwiched between non-magnetic substrates, the opposing area of the magnetic material between adjacent head chips is made smaller compared to a ferrite head, and the metal magnetic core is also used as a head. By arranging the magnetic cores obliquely to the chip end faces and increasing the distance between the magnetic core end faces of adjacent head chips, crosstalk between adjacent head chips 619 can be made extremely small.

Embodiment An embodiment of the multi-track head of the present invention will be described in Section 1.2.
This will be explained with reference to the figures.

FIG. 1 is a perspective view of a multi-track head in which three head chips are attached to a head base, and FIG. 2 is an enlarged view of the head sliding surface. Three ring-shaped head chips each having a coil 4 wound around a winding window 3 are mounted on a head base 5 made of metal or ceramics. A metal magnetic core 1 made of a ferromagnetic metal magnetic material such as an amorphous magnetic material or sendust is coated with calcium titanate, crystallized glass, etc. from both sides so as to be oblique to the end surface 7 of the head chip that is bonded to the head base 5. It is held between two non-magnetic substrates 2. As shown in FIG. 2, the magnetic gaps 8 of the head are formed at different distances with respect to the end surface 7 bonded to the head base 5, and the head is mounted on a rotating cylinder and moves obliquely with respect to the cylinder. When recording and playing back on a tape, the recording tracks are positioned in such a way that they do not completely overlap. Since the metal magnetic core 1 is formed obliquely with respect to the head chip end surface 7, the position of the metal magnetic core on the end surface 8.9 of the adjacent head chip is sufficient even when the head chips are in contact with each other. Compared to a structure in which the entire magnetic material having ferromagnetism faces each other, such as ferrite H/I' which is spaced apart and has a notch in the vicinity of the gap, crosstalk during recording and reproduction is kept sufficiently small.

Various combinations are possible regarding the magnetic gap distance and azimuth direction of the head. For example, there is a structure in which the azimuth is 0 degrees and there is a guard band gap between adjacent magnetic gaps, a structure in which adjacent heads have opposite azimuths and the magnetic gap width is wider than the recording track pitch, and an azimuth between adjacent heads. Various structures can be considered, such as a structure that is used in combination with another set of heads with the same magnetic gap pitch and recording track pitch and a reverse azimuth and a stagger. Either can be manufactured by selecting the direction in which the magnetic gap forming surface is cut out from the laminated pair of metal magnetic materials and the direction in which the head chip is cut out after the magnetic gap is formed. It is possible to align the magnetic gap on the head chip by controlling the dimensions from the head end face when cutting out the head chip, but to achieve even higher precision, it is possible to align the magnetic gap on the head chip by dividing a part of the head base and aligning each head. A structure that changes the relative position between chips is required.

In this embodiment, an example is shown in which the head chips are mounted on a flat head base, but as shown in FIG. By doing so, it is possible to create multi-track heads with different gap positions using head chips of the same size.

Effects of the Invention According to the present invention, since the head chip spacing can be minimized while keeping the crosstalk between heads small, the head
It becomes possible to maintain good contact between the tapes during sliding.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a multi-track magnetic head according to an embodiment of the present invention, FIG. 2 is a view of the head viewed from the sliding surface, and FIG. 3 is a multi-track magnetic head according to another embodiment of the present invention. FIG. 2 is a perspective view showing the main parts of a magnetic head. ■...Metal magnetic core, 2...Nonmagnetic substrate, 3.
... Winding window, 4 ... Coil, 5 ... Head base, 6 ... Magnetic gap, 7 ... End face.

Claims (1)

[Claims] A plurality of ring-shaped magnetic heads each having a head chip having a configuration in which a metal magnetic core is sandwiched from both sides by non-magnetic substrates so as to be oblique to the end surface of the head chip, and the plurality of head chips are configured to follow the trajectory of each track. 1. A multi-track magnetic head, characterized in that the metal magnetic cores are arranged on one head base so that they do not overlap each other and the metal magnetic cores do not face each other at the end faces of adjacent chips.