JPS647450Y2 - - Google Patents

Description

[Detailed description of the invention] The invention relates to a magnetic head, and more specifically,
The magnetic core is placed facing the opening of the shield case, which is composed of a shield case and a mask block.
The present invention relates to a magnetic head configured to be brought into contact with a magnetic recording medium.

A conventional magnetic head of this type is constructed as shown in FIGS. 1A and 1B.

That is, what is indicated by the reference numeral 1 in the figure is a shield case, and an opening 1a is formed on the side of the magnetic recording medium sliding surface of this shield case 1.
The upper edge of this opening 1a is defined by a mask block 7 integrated with the shield case 1.

What is indicated by the reference numeral 2 is a core half body, which is fixed by abutting each other on the left and right sides, and is faced into the shield case with the coil 3 attached to the base end, and the gap part 4 side is inserted into the opening. 1a
It is faced from the outside. Upper and lower magnetic core 2,
A shield plate 5 is arranged between the two.

In FIG. 1A, the reference numeral 6 indicates a magnetic recording medium, and arrow A indicates the direction of movement of the recording medium.

In a magnetic head having such a structure, when one track recorded on the magnetic recording medium 6 is reproduced, signals recorded on tracks other than the track to be reproduced are simultaneously reproduced due to magnetic flux leakage. A so-called inter-track crosstalk phenomenon occurs.

Generally, such inter-track crosstalk phenomenon tends to occur to a greater extent in a magnetic head having the mask block 7.

The reason for this is that during playback, when both or one corner a of the two sides of the mask block that is approximately perpendicular to the running direction of the recording medium comes into contact with the recording medium 6, the magnetic flux picked up here influences other tracks. This is to do so.

The present invention was developed in order to eliminate the above-mentioned drawbacks of the conventional magnetic disk.The present invention has been developed to reduce the influence of crosstalk between tracks due to the influence of mask blocks, and to achieve good magnetic recording and reproduction. The purpose is to provide a head.

In order to achieve the above object, the present invention has a structure in which at least one side of the mask block of the magnetic head is chamfered so that the gap of the magnetic core is exposed to the opening formed by the shield case and the mask block. Adopted.

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

FIGS. 2A and 2B illustrate an embodiment of the present invention. In this embodiment, a chamfered portion b is formed at the edge of at least one side of the mask block 7, and this chamfered portion b is A sloped structure as shown in Figure 3A or an arcuate structure as shown in Figure 3B was adopted.

If such a chamfer b is not provided, as described above, the edge of the mask block 7 or the edge of the opening of the shield case will form a magnetic circuit with the magnetic gap 4, resulting in Signals recorded on tracks other than the track to be reproduced will also be reproduced.

There is a large difference in this inter-track crosstalk between a head with the mask block 7 and a head without it, especially in the low frequency range of 1 KHz or less, and the head with the mask block is 20 to 30 dB worse.

However, when the chamfered portion is provided as described above, a phase shift occurs in the magnetic flux leaking from other tracks through the mask block 7, and as a result, the inter-track stroke is improved by more than 10 dB.

By the way, the positions where the chamfer b is applied are the left and right sides of the mask block 7 as shown in FIG. 4A, and the positions B in the same figure.
As shown in , the left and right sides and the bottom side, as shown in C, only the bottom side, as shown in D, only the left side, or as shown in E and F, one side on the left and right and the adjacent bottom side, etc. A combination of these is possible.

Furthermore, as shown in FIG. 4G and H, the edge portion of the shield case 1 adjacent to the mask block 7 may be chamfered b. If such a structure is adopted, an additional 5 to 10 dB improvement effect can be obtained. It will be done.

Furthermore, by chamfering the respective edges of the mask block 7 and the shield case 1, a total improvement effect of nearly 20 dB was obtained, making it possible to achieve an improvement that is almost the same as that of a magnetic head without a mask block.

As is clear from the above explanation, according to the present invention, since a magnetic head having a mask block has a structure in which at least one side of the mask block is chamfered, the magnetic head leaks from other tracks through the mask block. As a result, the occurrence of inter-track crosstalk has been significantly improved.

[Brief explanation of the drawing]

Figures 1A and B are a cross-sectional plan view and a front view illustrating a conventional structure, Figures 2 A and B are a partially enlarged cross-sectional plane view and a longitudinal side view illustrating an embodiment of the present invention, and Figure 3 A , B are enlarged sectional views illustrating the shape of the edge portion, and FIGS. 4A to 4H are front views illustrating different embodiments of the present invention, respectively. 1... Shield case, 2... Core half, 4...
... Magnetic gap, 6... Magnetic recording medium, 7... Mask block, a... Edge portion, b... Chamfered portion.

Claims (1)

[Claims for Utility Model Registration] (1) A mask block is fitted into a shield case made of a magnetic material, one side of the opening of the shield case is formed by one side of the mask block, and a magnetic core is inserted into the opening. 1. A magnetic head which faces a gap portion of the mask block, characterized in that at least one side of the mask block is chamfered. (2) The magnetic head according to claim 1 of the utility model registration, characterized in that at least one side of the shield case adjacent to the mask block is chamfered.