JPH0157406B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the manufacture of magnetic heads used in audio tape recorders, video tape recorders, etc., and particularly to a method of manufacturing magnetic heads which is suitable for erasing heads, has excellent productivity, and is inexpensive.

A conventional manufacturing method for this type of magnetic head A is as shown in an exploded perspective view in Fig. 1 and a sectional view in Fig. 2. First, sintered ferrite or Si-Al-Fe
A front core 1 is made of a magnetic material such as an alloy and has two gap grooves 1a formed therein to form a magnetic gap, and a connecting terminal 3 around which a coil 2 is wound is wound.
bobbin 4 with sintered ferrite or Si
-A rear core 5 made of a magnetic material such as an Al-Fe alloy and having a substantially E-shaped cross section, and a case 6 made of synthetic resin are prepared. First, the bobbin 4 is attached to the center of the rear core 5, and then the rear core 5 and the front core 1 are brought into contact with each other, housed in a case 6, and integrated with an adhesive 7. This state is shown in FIG. Next, as shown by the two-dot chain line in FIG. 2, the tape is ground by a grinder to form a tape sliding surface 8 of a predetermined shape. Note that the case 6 may be pre-formed into a frame shape, but the front core 1, rear core 5
etc. are set in a mold of a molding machine, and resin is molded on the outer periphery to mold the case 6 and fix the front core 1, rear core 5, etc. at the same time.

However, in the above manufacturing method, the magnetic head A
Because they are processed one by one, the number of processing steps is large, and when the front core 1, rear core 5, etc. are assembled into the case 6, they are fixed with the adhesive 7, which requires a long time for curing. Case 6 with molding machine
When integrally molding the magnetic head A
Since molding resin adheres to the entire circumference of the mold, a large amount of molding resin is used and it is difficult to miniaturize.

The present invention was made in view of the above-mentioned drawbacks of the conventional technology, and it has good workability, saves raw materials, and
In order to provide a method for manufacturing a magnetic head that can be further miniaturized, the present invention provides a front core block equipped with a plurality of magnetic gaps for configuring at least two magnetic heads, and a rear core block corresponding to the front core block. The front core block and the rear core block are integrated with a resin molded case block to form a head block, and the head block is then cut into a plurality of pieces to obtain individual magnetic heads. It is characterized by

Embodiments of the present invention will be described below based on the drawings. Incidentally, during the explanation, parts that are the same as those in the conventional example are denoted by the same reference numerals, and the explanation will be omitted.

First, in order to form the front core 1, a plate-shaped material made of a magnetic material such as sintered ferrite or Si-Al-Fe alloy is prepared, and a pair of gap grooves 9a are formed in this material as shown in FIG. A plurality of core blocks are arranged in parallel at desired intervals to form a front core block 9. Similarly, in order to form the rear core 5, a block made of magnetic material is prepared, and approximately E-shaped comb teeth are inserted into the gap groove 9a of the front block 9 as shown in FIGS.
A plurality of core blocks are formed to correspond to the rear core block 10. Further, a plurality of bobbins 4 around which the coil 2 is wound and provided with the connection terminals 3 are prepared as in the conventional case.

Next, the bobbin 4 is attached to the center of the rear core block 10 as shown in FIG. 3, and the rear core block 10 and the front block 9 are made to correspond to each other as shown in FIG. A case block 12 is formed by molding resin around the case block 12, and the front core block 9, rear core block 10, etc. are fixed inside the case block 12 to form a head block as shown in FIG. Get 11. Next, the head block 11 is cut into a plurality of pieces using a forming grindstone 13 as shown in FIG. 5, and the tape sliding surface 8 is formed. This forming whetstone 13 has cutting blades 13a having a constant interval corresponding to the gap between the gap grooves 9a of the head block 11, and a tape sliding contact surface 8 formed in a recess between the cutting blades 13a. The set head block 1 has an abrasive part 13b of
1, cutting and polishing operations can be performed simultaneously and easily. As a result, a plurality of magnetic heads A are formed simultaneously, as shown in FIG.

In the above embodiment, the head block 11
The cutting of the tape and the polishing of the tape sliding contact surface 8 were performed at the same time. First, a wire cutter, slitting machine, etc. was used to cut into a plurality of magnetic heads A, and then each magnetic head A was polished and the tape sliding contact surface 8 was polished. Contact surface 8
may be formed.

The present invention is as described in detail in the examples above,
A front core block equipped with a plurality of magnetic gaps for configuring at least two or more magnetic heads and a rear core block corresponding to this front core block are prepared, and the front core block and rear core block are molded with resin. A case block is integrated to form a head block, and this head block is cut into a plurality of pieces to obtain individual magnetic heads. Therefore, according to the manufacturing method of the present invention, the front core block and the rear core block can be formed by integrating them with a resin mold and cutting them, so the case part can also be integrally formed, and the number of parts is small. In addition, the assembly process can be greatly reduced, and magnetic heads can be produced in large quantities with fewer work processes, improving productivity and reducing costs. Since the rear core and other parts are exposed, there is no extra case part, making it more compact and also saving raw materials for the case.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a magnetic head showing a conventional manufacturing method, FIG. 2 is a vertical sectional view of a magnetic head showing a conventional manufacturing method, and FIG. 3 is a manufacturing method of an embodiment of the present invention. FIG. 4 is a vertical sectional view showing a manufacturing method according to an embodiment of the present invention, FIG. 5 is a perspective view showing a cutting step in a manufacturing method according to an embodiment of the present invention, and FIG. 1 is a perspective view of a single magnetic head manufactured according to the invention; FIG. 1... Front core, 1a... Gap groove, 2... Coil, 5... Rear core, 6... Case, 9... Front core block, 9a... Gap groove, 10... Rear core block, 11... Head block, 12... Case block, A ...magnetic head.

Claims (1)

[Claims] 1. A front portion of a magnetic head comprising a core forming a gap groove, a coil attached to the core, and a case covering the core and the coil, which is provided with a plurality of gap grooves to form at least two or more magnetic heads. A core block and a rear core block corresponding to the front core block are prepared, the front core block and the rear core block are integrated with a resin molded case block to form a headblock, and this headblock is cut into multiple pieces to be individually cut. A method of manufacturing a magnetic head, which obtains a magnetic head of