JPS62177713A - Magnetic head - Google Patents

Abstract

PURPOSE:To reduce sections of cores to lower the impedance of a magnetic head by inclining a core part, around which a coil is wound, with respect to side faces of the head. CONSTITUTION:Cores 1 and 2 consists of a 'Sendust(R)' alloy and are adhered with a gap G having prescribed dimensions. Cores 1 and 2 are so partially cut that an upper half higher than a part 5 around which the coil is wound is inclined to head side faces 4, and an insulating material 3 is filled in this cut part. By this constitution, the impedance is lowered without making cores thin neither reducing the number of turns of the coil because core sections of the part around which the coil is wound are reduced.

Description

[Detailed Description of the Invention] The present invention is suitable for use in applications where high recording density is required, such as 8+nV.
This article relates to a proposal for a magnetic head suitable for TR, etc.

In order to increase the recording density in VTR, it is necessary to increase the tape running speed and increase the recording frequency. By the way, as the recording frequency increases, it becomes necessary to efficiently reproduce high frequency ranges during reproduction, and for this purpose it is necessary to further lower the impedance seen from the output side of the magnetic head.

Incidentally, although the impedance of the magnetic head can be easily lowered by reducing the number of turns of the coil, there is a drawback that the sensitivity of the magnetic head becomes worse.

Therefore, it is required to achieve low impedance without reducing the number of coil turns. It is known that in order to meet this requirement, the cross section of the core, especially the core cross section of the portion around which the coil is wound, can be made smaller.

Problems to be Solved by the Invention Naturally, in order to reduce the core cross-sectional area, the core must be made thinner, but in the case of magnetic heads for VTRs where the head itself is small, it is necessary to make the core thinner. There is a problem in that it is difficult to form a thin core.

In view of these problems, the present invention provides an extremely useful magnetic head in which the core can be made thinner than the current one (although the core cross section can be made smaller and lower impedance can be achieved). It is intended to.

In order to achieve the above object, the present invention is characterized in that at least the portion of the core around which the coil is wound is thin and inclined with respect to the side surface of the head.

If the core is thin and inclined with respect to the side surface of the working head, the view (front view) of the head viewed from the tape wrap surface will be as shown in FIG. 5(A). In the figure, 1.2 is a core, 3 is an insulating material such as glass, and 4 is a side surface of the head. In the current magnetic head, the core 1.2 is parallel to the head side surface 4 as shown in FIG. 2).

By the way, since the core cross section of the part where the coil is wound is the same as the core area on the tape wrap surface or is smaller by the amount that the winding window is formed, it is difficult to compare the current head with the head of the present invention. The core cross section of the portion around which the coil is wound is smaller in the head of the present invention when the core thickness t is the same. As a result, it is possible to lower the impedance of the magnetic head without reducing the number of coil turns or making the core thinner.

1 shows a perspective view of a magnetic head as an embodiment of the present invention. The core 1.2 is made of Sendust alloy, for example, in order to cope with high recording density, and is bonded with silver solder or the like while maintaining a predetermined dimension as a front gap G. As shown in FIG. 2, the upper half of each core 1, 2 is partially cut out from the coil-wound part 5 so that it is inclined to the head side surface 4, and the cut part is It is filled with an insulating material 3 such as glass.

In the figure, 6 is a winding, and 7 is a winding insertion window.

The magnetic head having the above structure can be manufactured in the same manner as the current magnetic head shown in FIG. 5(b). That is, as shown in FIG. 3, after joining two core base materials, a groove 11 to be filled with glass is formed using a guising tool or the like, and after being filled with glass 3, the core base materials are sliced. However, in this case,
Since the direction of the grooves 11 determines the inclination angle θ of the cores 1 and 2 with respect to the side surface of the head, it is different when manufacturing the head of this embodiment and when manufacturing the current head. FIG. 4 shows the direction of the grooves 11 when manufacturing the head of this embodiment.

In the figure, S... is a slicing line, and by cutting along this line S..., a head chip having the configuration shown in FIG. 1 is obtained.

In the magnetic head shown in the figure, the upper half of the part where the coil is wound is inclined with respect to the side surface of the head, but at least the core part where the coil is wound is thin and inclined with respect to the side surface of the head. That's enough. Further, the inclination angle of the core with respect to the side surface of the head is determined to be an appropriate angle in relation to the impedance required of the magnetic head.

Further, although the core 1.2 in the illustrated example is made of sendust alloy, it goes without saying that a ferrite thin film, ultra-quenched amorphous, sputtered amorphous, etc. can be used.

As described above, in the magnetic head according to the present invention, at least the core portion around which the coil is wound is inclined with respect to the side surface of the head. The impedance of the magnetic head can be lowered without reducing it, and as a result, high recording density can be realized by increasing the tape running speed and simultaneously increasing the recording frequency.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a magnetic head as an embodiment of the present invention, FIG. 2 is a diagram showing the core of the head shown in FIG. 1, and FIG. 3 shows a core block before manufacturing the magnetic head. figure,
FIG. 4 is a plan view of the core block showing the state before it is divided into magnetic heads by slicing, FIG. FIG. 2 is a plan view of a conventional magnetic head viewed from the tape wrap surface. 1.2...Core, 4...Head side. 1st figure stone! Go to the next destination. Figure 2.

Claims (1)

[Claims] A magnetic head characterized in that at least a portion of the core around which a coil is wound is thin and inclined with respect to a side surface of the head.