JPS58220237A - Magnetic head core and its production - Google Patents

Abstract

PURPOSE:To obtain monolithic structure of plural magnetic head cores, by irradiating laser light to a center core block adhered with left and right core half blocks to form a nonmagnetic layer. CONSTITUTION:Left and right core half blocks 4 having grooves 4A are adhered to both sides of a center core block 5. The sliding surface of a magnetic recording medium of the butted blocks is polished cylindrically. Then the block is sliced with the prescribed thickness to produce magnetic head cores 11. The laser light is irradiated to the core 11 from a direction shown by the arrow A to form a nonmagnetic layer 6. This enables to produce >=2 magnetic head cores at one time approximately in the same number of processes as just required for producing one conventional head core.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to multiple conventional video tape recorders, such as video tape recorders, which have multiple recording and playback modes such as slow playback and stop motion. A pair of magnetic helads
. FIG. 2 shows the shape of a magnetic heald core IO used in the above-described magnetic head.

The magnetic head core is made of a metal material such as single-crystal ferrite, sendust, or amorphous, and by giving this magnetic bed core lO a track width suitable for each recording/reproducing mode, two sets of magnetic heads 1 .2゜1', 2'□ were obtained.

When using the magnetic head arrangement method described above, each of these heads requires precision in circumferential division and height precision from the rotating cylinder reference plane, which naturally requires adjustment work, and in practice In this case, installation work for two sets of magnetic heads and adjustment work for their relative positions are required, which increases the number of steps, resulting in increased costs and an increase in the number of locations for maintenance and inspection.

Therefore, the present invention has been made in view of the above points,
The purpose of the present invention is to provide a magnetic head having two or more magnetic held cores, and a means for integrally forming the same,
It is also an object of the present invention to provide a magnetic head that reduces the number of manufacturing steps and has high core strength and adhesive strength.

In order to achieve the above object, in the present invention, a plurality of magnetic head cores are obtained by integrally molding left and right core semi-dead blocks by bonding them to a center block, and then forming a nonmagnetic layer on the center block by irradiating a laser beam or the like. The manufacturing method was adopted.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. FIG. 3 to FIG. 6 show the magnetic head according to the present invention.
6, which describes an example of the manufacturing process, and the same parts in each figure are given the same reference numerals.

First, as shown in FIG. 3, left and right half-core blocks 4 are glued to both sides of the center core block 5. As shown in the figure, grooves 4A having a trapezoidal cross-sectional shape are formed in the surfaces of the half-core blocks 4 on both sides to be bonded to the center core block 5.
is provided. This becomes a winding window as described later.

Next, as shown in FIG. 4, the sliding surface of the magnetic recording medium of the abutted block obtained as described above is subjected to finishing cylindrical grinding.

Next, as shown in FIG. 5, the abutted block is sliced into a predetermined thickness to obtain a magnetic held core 11 having two winding windows 4'A.

Furthermore, a nonmagnetic layer shown by reference numeral 6 in FIG. 6 is formed by irradiating a laser beam or the like from the direction shown by arrow A in FIG.

As described above, two magnetically independent magnetic herad cores can be integrally constructed.

FIG. 7 shows an implementation example of the magnetic head core 11 of the present invention. By adhering the magnetic head core 11 obtained as described above to the head base 7, two magnetically independent magnetic heads can be integrally constructed.

As is clear from the above description, according to the present invention, the left and right core semi-dead blocks are adhered to the center block, and then a non-magnetic layer is formed on the center block by laser beam irradiation, etc., thereby forming a plurality of magnetic layers. Since we adopt a manufacturing method that obtains the head core by integral molding, two or more magnetic rad cores can be obtained using the same number of steps as the conventional method of obtaining one magnetic rad core. Since a non-magnetic layer is formed by irradiation without applying mechanical stress, core strength and core adhesion strength can be improved, and even in the blade alignment adjustment work, more than 21 adjustments can be made at one time. It is possible to provide an excellent magnetic core.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram illustrating the arrangement of a conventional magnetic head, Fig. 2 is an explanatory diagram showing the structure of a conventional magnetic helad core, and Fig. 3 is an explanatory diagram illustrating the arrangement of a conventional magnetic head.
5 to 5 are perspective views illustrating the method for manufacturing magnetic head cores of the present invention, FIG. 6 is a front view of the magnetic head core of the present invention, and FIG. 7 is a magnetic head obtained by the manufacturing method of the present invention. FIG. 4...Core half-closed block 4A...Groove 4' A.
... Winding window 5 ... Center core block 6 ...
Nonmagnetic layer 7...Head base 11...
magnetic head core

Claims (2)

[Claims] (1) A magnetic head core characterized in that a plurality of magnetic head cores are integrally molded and a nonmagnetic layer is formed between each magnetic head core. (2) A method for manufacturing a magnetic head core, comprising the steps of bonding the left and right half-core core blocks to a center block, and forming a nonmagnetic layer by irradiating a central part of the center block with a laser beam.