JPS6236284B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head, and more particularly to a multi-channel magnetic head in which heat generation of the magnetic head is reduced.

The structure of a magnetic head with two or more channels is as shown in FIGS. 1 and 2. That is, in FIGS. 1 and 2, reference numeral 1 indicates a core for the first channel head, and reference numeral 2 indicates a core for the second channel head, each having a gap 3 and a separate core provided with a winding 4. The two are stacked in contact with a substantially U-shaped conductive spacing plate 5, and assembled into an integrated magnetic head 6 as shown in FIG.

In a magnetic head equipped with such a spacing plate, there is a problem in that the spacing plate 5 generates heat in the vicinity of the gap 3 due to eddy current loss. In particular, when metal tapes or high coercive force tapes are used these days, a strong magnetic flux is required in gap 3, which causes more heat to be generated in the spacer plate 5, resulting in a large temperature rise, which increases the heat generation of the magnetic head as a whole. The disadvantage is that the amount is also large.

In Fig. 5, the curve indicated by the symbol X shows the relationship between usage time and temperature rise when the conventional structure is adopted, and as is clear from the figure, a large temperature rise occurs in a short period of time. ing.

An object of the present invention is to provide a magnetic head with significantly reduced temperature rise.

In order to achieve the above object, the present invention has a structure that prevents the generation of eddy currents and suppresses heat generation by cutting out the part of the spacer plate interposed between the magnetic heads corresponding to each channel that faces the gap. It was adopted.

Hereinafter, details of the present invention will be explained based on embodiments shown in the drawings.

3 and 4 illustrate different embodiments of the present invention. In the embodiment shown in FIG. 3, the spacing plate 7 is divided into a pair of left and right pieces 7a, 7b, A distance W is maintained between the parts facing the gap.

When such a structure is adopted, the spacing plate 7 and the gap of the magnetic head do not correspond to each other, so the magnetic flux leaking from the gap does not pass through the spacing plate 7, and therefore no eddy current is generated in the spacing plate 7. Heat generation can be prevented.

In order to prevent the generation of eddy currents, it is sufficient to prevent the magnetic flux leaking from the gap portion from passing through the spacing plate, so it is not necessary to divide the spacing plate 7 into two pieces as shown in Figure 3. Alternatively, a structure may be adopted in which the proximal end portions of the left and right pieces 7a and 7b are connected and integrated by a connecting portion 7c, and a gap W is provided in the portion facing the gap portion.

If the spacing plate structure shown in Figures 3 and 4 is adopted, there will be no heat generation at all in the spacing plates, and the heat generated by the magnetic head itself will be limited to the windings and core material, so the heat generation of the head itself will be significantly reduced. Even if a metal tape or a high coercive force tape is used, the heat generation of the magnetic head can be significantly reduced.

The curve indicated by the symbol Y in Fig. 5 shows the relationship between the usage time and the temperature rise of the magnetic head when the spacing plate is provided as described above. It is possible to suppress the temperature rise to approximately 1/2.

Although the above embodiment has been applied to a so-called W-gap type magnetic head, it will be understood that the present invention can also be applied to a single-gap head.

As is clear from the above description, according to the present invention, the part of the spacer plate of the multi-channel magnetic head that faces the gap is cut out, so that the magnetic flux leaking from the gap part does not pass through the spacer plate. Therefore, no eddy current loss occurs, heat generation is prevented, and the heat generation of the entire magnetic head can be significantly reduced.

[Brief explanation of the drawing]

1 and 2 are an exploded perspective view and an assembled perspective view of a conventional multi-channel magnetic head;
3 and 4 are perspective views illustrating different embodiments of the spacing plate applied to the present invention, and FIG.
The figure is a diagram showing the relationship between usage time and temperature rise of the magnetic head according to the present invention and a magnetic head of conventional structure. 1... Core for the first channel head, 2...
Core for second channel head, 3... Gap, 4... Winding wire, 5, 7... Spacing plate, 6... Magnetic head, 7a, 7b... Piece, 7c... Connection section.

Claims (1)

[Scope of Claims] 1. In a multi-channel magnetic head in which conductive spacing plates are stacked in contact between the cores of a plurality of heads, leakage from the gap portion is prevented by cutting out the vicinity of the spacing plate facing the head gap. A magnetic head characterized in that magnetic flux is prevented from passing through a spacing plate. 2. The magnetic head according to claim 1, wherein the spacer plate is divided into a pair of left and right pieces and placed facing each other with a predetermined distance between them.