JPS58137114A - Magnetic head - Google Patents

Abstract

PURPOSE:To facilitate the manufacture of a magnetic head and to reduce its cost by fixing a magnetic core half body and a shield plate in one body with a fixing material and allowing two core assembly half bodies to abut on each other in one body. CONSTITUTION:A die 14a for uniting formation has a small hole 15 where the tip part 3a of a magnetic core half body 3 is to be fitted at a one-stage lower flat part 14b and small holes 16 and 16 where the rear end parts 3b of the magnetic core half body 3 are to be fitted at a one-stage higher part 14c. A groove 17 where the shield plate 4 is to be fitted is formed from the stage part 14c to the flat part. The small holes 15 and 16 and groove 17 of the die 14a are utilized to fit a couple of magnetic core half bodies 3 and the shield plate 4 together and the other die 18a is superposed thereupon. This die 18a has a pouring gate for a material such as molten resin and in its butt surface, a die cavity 18c which serves as a pouring space for the material in cooperation with the butt surface of the die 14a is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head, and more particularly to a magnetic head that has a simplified structure and is easier to assemble.

A conventional magnetic head has been constructed as shown in FIGS. 1 to 3, for example.

FIG. 1 shows the core assembly half-time, in which the core assembly half 1 is assembled with the core support half 2 as a reference. The core support half 2 has a substantially L-shaped cross section, and extends from the bent part 2a formed to allow the magnetic tape to slide, to the thick part 2b formed on the inner surface of the core support half 2, for example. Two grooves 2c, 2c are formed, and the core half-hole 3.3 is fitted into these grooves 2C. The core halves 3, 3 are formed into a substantially U-shape, with the tip 3a facing the tip of the core support half 2, and the rear end 3b having a coil bobbin and a bobbin terminal wound with a coil, which will be described later. are fitted.

Further, another #12d is formed in the core support half 2 between the grooves 2C, and the blocking plate 4 is fitted into this groove 2d. The tip of the blocking plate 4 faces the tip of the core half 3.

After the core assembly half 1 having such a structure is fitted and fixed with the core half 3 and the blocking plate 4, the magnetic tape sliding surface side is finished by lapping.

On the other hand, core assembly halves 1 formed in exactly the same manner are prepared, 1 are butted together, and the rear end 3 of the core half 3 is
As shown in Fig. 2, the coil 5 is wound around b and 3b.■ Tips 3g and 3a of the coil bobbin 3.
is a spacer 8 forming a magnetic gap between the opposing ones.
are matched via.

The core assembly halves 1.1 integrated in this way constitute a core assembly 9, and as shown in FIG.
16o, to the resin 41 in a state where a is formed on the front surface of the shield case and faces the opening 10M. Yo, two, 9.
3,. ,two.

A magnetic head 12 is obtained.

However, if the conventional structure as mentioned above is adopted, there will be a large number of parts and a large number of man-hours will be required for each female.

Due to the dimensional accuracy of the core support halves 2 and variations during assembly, the precision of channel and track positions deteriorates, and variations occur between individual magnetic heads, making it impossible to obtain a uniform product. .

The present invention has been made to eliminate the above-mentioned drawbacks of the conventional magnetic head, and aims to provide a magnetic head that is easy to manufacture and inexpensive to manufacture by reducing the number of parts and the number of assembly steps. .

In order to achieve the above object, the present invention integrates a magnetic core and a shielding plate with a fixing material to form a half-core assembly, grinds the abutting surfaces, and butts them facing a similarly processed half-assembled core. By doing so, we adopted a structure that creates a magnetic head.

The present invention will be described in detail below based on embodiments shown in the drawings.

4 to 6 illustrate an embodiment of the present invention,
In each figure, the same parts as in FIGS. 1 to 3 are given the same reference numerals, and their explanations will be omitted.

First, as shown in the fourth factor, a mold 14M for integral molding is prepared. This money is IN! 14 Jl has a small hole 15 into which the tip end 3a of the magnetic core half 3 is fitted in its lower flat part 14b, and a rear end 3b of the magnetic core half 3 in the raised part 14C. A small hole 16.16 into which is fitted is formed. Further, it has a groove 17 in which the blocking plate 4 is fitted over the stepped portion 14c and the flat portion.

After fitting and attaching the pair of magnetic core halves 3 and the blocking plate 4 using the small holes 15° 16 and the groove 17 of the mold 14a thus formed, as shown in FIG. Lay the other mold 181 on top of it. This mold isa has a runner 18b filled with a material such as molten resin, and the mold 14! A mold cavity 18c, which serves as a material filling space, is formed in cooperation with the abutting surfaces.

When the molds 14m and 181 are butted together as shown in FIG. 5 and resin is injected from the runner 18b, the resin infiltrates into the mold cavity 18c and fills the space formed between the butt surfaces of the molds 14a and 181. Filled. After the resin has solidified, when the molds 14a and 18a are opened, the solidified resin plays the role of the conventional core support, as shown in FIG.
Furthermore, it is possible to obtain a magnetic core assembly half 19 having the magnetic core body 3 and the shielding plate 4 integrated with this resin. Magnetic core assembly half-time 1 obtained in this way
9. After finishing the mating surfaces in step 19 by grinding or lapping, etc., fit the bobbin around which the coil is wound and the bobbin terminal integrated with it to the rear end 3b of the magnetic core half 3 in the same manner as before. Then, insert a spacer to form a gap on the tip side and butt the two half-assembly members of the magnetic core together to form the magnetic head element.Furthermore, fit this into the shield case and fill it with resin. Then, the sliding surface side of the magnetic recording medium is ground to complete the magnetic head.

As described above, the magnetic head of the present invention has a structure in which the magnetic core half-closed and the shielding plate are integrated with resin, so there is no need to handle these members as separate members as in the past, and the magnetic head half-closed can be treated as one component.

Therefore, the magnetic core is on hiatus! While positioning the 4# board l1
II'r There is no need to incorporate it into a core support, etc., and assembly is easy, the number of parts is small, and a high-precision magnetic head with uniform dimensional accuracy can be obtained.

It should be noted that although the above-described embodiment has been explained using a two-channel magnetic head as an example, it can be applied to a monaural or multi-channel magnetic head in exactly the same manner.

In addition, in the above-mentioned embodiments, an example was explained in which resin was used as the material to be integrated, but if a non-magnetic sintered material such as ceramic is used as the material to be integrated, it is possible to create a half magnetic core, a shield plate, etc. It is possible to remove the deteriorated layer during processing, and moreover, it is possible to achieve even stronger fixation.

As is clear from the above description, according to the present invention, a structure is adopted in which the magnetic core half-closed and the shielding plate are integrated with a fixing member such as resin using a mold, so that the positioning of the magnetic core half-closed and the shielding plate can be easily determined. This can be done using a mold, making it extremely easy to obtain a high-precision magnetic head and achieving a significant cost reduction.

[Brief explanation of the drawing]

1 to 3 illustrate the conventional structure. FIG. 1 is a perspective view of a half-finished core assembly, FIG. 2 is a perspective view of the core assembly, FIG. 3 is a perspective view of a completed magnetic head, and FIGS. 4 to 6 illustrate an embodiment of the present invention. FIG. 4 is a perspective view illustrating how to attach the core half-hole and the blocking plate to the mold. FIG. 5 is a vertical sectional side view of the molds in a butted state. FIG. 6 is a perspective view of the core assembled cow body. 1.9.19...Core assembly cow body, 2...Core support, 3...Core half-rest, 4...Break plate, 5...
coil. 6...Bobbin terminal%10...Shield case. 12...Magnetic head, 14a, 18a...Mold. 15.16...small hole, 17...groove, isb...runner. 18c...Mold cavity.

Claims (3)

[Claims] (1) A magnetic head characterized in that a magnetic core half-hole and a shielding plate are integrally fixed with a fixing material to form an integrated core assembly half, and the core assembly half-holes are butted against each other to be integrated. (2) The magnetic head according to claim 1, wherein the fixing material for the core half-hole is made of synthetic resin. (3) The magnetic head according to claim 1, wherein the fixing material for the magnetic core half-hole is a non-magnetic sintered material.