KR910003795B1 - Magnetic head manufacturing method - Google Patents

Abstract

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Description

Manufacturing method of magnetic head

1 is a perspective view showing an example of a magnetic head manufactured by the manufacturing method of an embodiment of the present invention.

2 is an explanatory diagram showing one step of the method of manufacturing the magnetic head shown in FIG.

3 is a perspective view showing another process of the method of manufacturing the magnetic head shown in FIG.

4 is a perspective view showing still another step of the method of manufacturing the magnetic head shown in FIG.

5 is a cross-sectional view showing a polishing process of the magnetic head shown in FIG.

FIG. 6 is an enlarged view of a connecting portion of a lead wire in the magnetic head shown in FIG.

FIG. 7 is a perspective view showing a modification of the lead wire connection method in the magnetic head shown in FIG.

8A and 8B are enlarged front views and another enlarged cross-sectional view taken along the line I-I showing another modification of the lead wire connecting method in the magnetic head shown in FIG.

* Explanation of symbols for main parts of the drawings

1: Back core 1a, 2b: Vertical groove

2: front core 2a: magnetic gap

3: coil 3a: lead wire

4, 4c, 4d: Terminal board 4a: Notch

4b: Seasonal Piece 5: Resin Molded Part

6: sliding contact surface 11: back core block

12: front core block 14, 14A: terminal block

15: bonded body 16: forming block

17 solder ball 20 magnetic head

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a magnetic head, and more particularly to a method of manufacturing a magnetic head such that a plurality of magnetic heads can be manufactured simultaneously.

Conventionally, in this method of manufacturing a magnetic head, a coil is wound around a coil bobbin provided with a terminal pin, a lead wire is wound around the terminal pin, and soldered. Then, a coil bobbin is inserted into each core and a head component is formed into a molding mold. The magnetic heads were individually manufactured by inserting and fixing the resin by injecting the resin and grinding the sliding contact surface of the thus formed magnetic head into an arc shape.

In the conventional manufacturing method of the magnetic head, since the coil bobbin is used, the number of parts is increased, the cost of the parts is increased, and the terminal pins protrude largely outward of the magnetic head, which makes it difficult to miniaturize the magnetic head. . In addition, since the magnetic head is separately inserted into a mold, the molding takes a number of manufacturing steps and a manufacturing time.

It is an object of the present invention to provide a method of manufacturing a magnetic head in which a plurality of miniaturized magnetic heads can be manufactured simultaneously and the number of manufacturing steps and manufacturing time of the magnetic heads are minimized in view of the above problems.

The magnetic head manufacturing method of the present invention comprises the steps of connecting the lead wires of the plurality of coils to the terminal plate block, the step of inserting the plurality of coils into the vertical grooves formed in the back core block, respectively, and the front core in the back core block. The process of putting blocks together and joining, the process of storing and sealing the joined body in a molding die, cutting the sealed molded blocks to separate them into individual magnetic heads, and polishing the sliding contact surface of the separated magnetic heads And separating the terminal plate into two terminal plates.

In the manufacturing method of the magnetic head of the present invention, a bonded body consisting of a plurality of coils, terminal block blocks, back core blocks and front core blocks is housed in a molding die and sealed, and the molded blocks are cut and separated into individual magnetic heads. Since the sliding contact surface of the terminal plate is separated into two terminal plates, a plurality of magnetic heads can be manufactured at the same time.

Next, the present invention will be described with reference to the drawings.

1 is a perspective view showing a magnetic head manufactured by the manufacturing method of one embodiment of the present invention. The magnetic head is stored in the back core 1, the front core 2 which is placed on the top surface of the back core 1, and joined to each other, and the longitudinal groove 1a of the back core 1 (see Fig. 2). A pair of terminal plates 4 and their magnetic head components partially exposed at the lower half of the front face of the magnetic head to which the coil 3 (see FIG. 2) and the lead wires 3a at both ends of the coil 3 are respectively connected. The resin mold portion 5 is formed by resin molding to form the external shape of the magnetic head. In addition, two rows of magnetic gaps 2a are exposed on the sliding contact surface 6 of the magnetic head.

Next, a method of manufacturing the magnetic head of this embodiment for manufacturing the magnetic head 20 as shown in FIG. 1 will be described.

First, as shown in FIG. 2, the back core block 11 having the plurality of vertical grooves 1a formed on the upper surface thereof, and the plurality of magnetic gaps 2a and the vertical grooves 2b are formed vertically of the back core block 11. The front core block 12 provided on the lower surface portion corresponding to the groove 1a, the plurality of coils 3 wound and insulated in a long shape, and a plurality of sections formed of a material such as brass or phosphor bronze, for example. The terminal block 14 having the cutouts 4a formed therein is prepared. The central portion of the upper surface of the front core block 12 has one end lower than the front and rear edges, and a plurality of magnetic gaps 2a are formed in the central portion.

Next, the lead wires 3a at both ends of the coil 3 are arranged at predetermined positions of the inner side edges of the surface side of the cutouts 4a of the terminal plate block 14, and the solder balls 17 are enlarged as shown in FIG. The lead wires 3a are attached to the terminal plate blocks 14 by dropping and soldering.

Subsequently, the plurality of coils 3 with the terminal plate blocks 14 are inserted into the longitudinal grooves 1a of the back core blocks 11, and then the front core blocks 12 are placed on the back core blocks 11. Bond.

Then, a bonded body 15 as shown in FIG. 3 is obtained, and the bonded body 15 is housed in a molding die (not shown), and sealed by an injection mold or the like to fix each magnetic head component.

Then, the molding block 16, as shown in FIG. 4, taken out from the molding mold, is cut along a plurality of cutting lines as indicated by the double-dashed line and separated into individual magnetic heads.

Then, the sliding contact surface 6 serving as the upper surface of the separated magnetic head is polished into an arc shape as shown by the dashed-dotted line in FIG. 5 to complete the magnetic head shown in FIG. At this time, the upper portion of the front core (2) is polished to release the bridge by the front and rear edge of the front core (2) to separate the center core and the left core and the right core. As shown in FIG. 5, the upper connecting portion of the terminal plate 4 is polished in an arc shape as shown by a double-dotted line to form a sliding contact surface 6, and at the same time, the terminal plate 4 also has left and right terminal plates 4c. Separated by (4d). Therefore, the lead wire 3a of both ends of the coil 3 does not become short-circuited, and the magnetic flux generate | occur | produces in the coil 3 by energizing between the separated both terminal boards 4c and 4d. The magnetic flux acts on the magnetic recording medium of the magnetic tape via the magnetic gap 2a.

In addition, in the description of the embodiment of the present application, as described with reference to FIG. 6, the lead wires 3a at both ends of the coil 3 are arranged at predetermined positions of the inner side edges of the cutouts 4a of the terminal plate block 14. Although the lead wire 3a was attached to the terminal plate 4 by soldering, it may be as described in Figs. 7 or 8 (a) and (b) as another embodiment.

When the narrow terminal plate block 14A of the notch 4a shown in FIG. 7 is used, the lead wire 3a is arranged at a predetermined position on the rear surface of the terminal plate block 14A, and the solder ball 17 is dropped. The lead wires 3a may be attached to the terminal plate blocks 14 by soldering.

As shown in FIGS. 8A and 8B, the plurality of pairs of lead wires 3a are formed as lead wire connecting portions at inner edges of the cutouts 4a of the terminal plate block 14. It may be interposed between the season piece 46 and the terminal plate block 14 so as to be attached to the terminal plate block 14, respectively.

As described above, according to the manufacturing method of the magnetic head of the present invention, the number of parts can be reduced and the cost of components can be reduced by not using a coil bobbin, and terminal pins are not necessary, thereby miniaturizing the magnetic head. There is.

In addition, since a plurality of magnetic heads are formed at the same time, the manufacturing process of the magnetic head is simplified and the manufacturing time is also shortened.

Claims (1)

A plurality of coils 3 connecting the lead wires 3a to the terminal plate block 14; Inserting the plurality of coils (3) into the vertical grooves (1a) formed in the back core blocks (11), and placing the front core blocks (12) on the back core blocks (11) and joining them; A step of encapsulating the bonded body 15 of the back core block 11 and the front core block 12 in a molding die and sealingly forming the molded body; Cutting the molding block to separate the individual magnetic heads 20; And grinding the sliding contact surface (6) of the separated magnetic head (20) to separate the terminal plate (4) into two terminal plates (4c) (4d).

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