JPH0426968Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a magnetic head, and particularly to the structure of the core.

Prior Art and Problems Generally, the core of a magnetic head has a structure in which a pair of core halves are butted against each other.

The core that facilitates this structure is made by bending a thin strip of scratched material made of magnetic material into a loop shape and abutting both ends. The coil is fitted over the elongated strip.

In the latter core as well, the magnetic gap portion has a structure in which a non-magnetic gap spacer part is sandwiched, similar to the structure in which a pair of core halves are butted against each other.

For this reason, although the core was made into a single component, when assembling the head element, it was necessary to prepare a gear spacer component separately and insert it, which caused the problem of poor assembly efficiency.

The object of the present invention is to provide a magnetic head that solves the above problems.

Means to Solve the Problem The structure for this purpose is such that the core is formed by bending a long thin strip material into a loop shape, and the coil is fitted in the middle of the long thin strip material bent into the loop shape. In the magnetic head configured as above, the elongated strip material is placed on one side of the strip material made of a magnetic material, and a strip made of a non-magnetic material whose thickness is half the gap length to be formed is placed over the entire length of the strip material made of a magnetic material. The clad structure has a clad structure, and the elongated strip of the clad structure is bent into a loop shape with the non-magnetic material layer inside, and the non-magnetic material layers on both ends abut each other to form a magnetic gap part. It is structured as follows.

Embodiment FIG. 1 shows a DC erasing magnetic head 10 of a microcassette tape recorder, which is an embodiment of the magnetic head of the present invention, in correspondence with a microcassette 11 and a recording/reproducing magnetic head 30. Of the erasing magnetic head 10, a small protrusion 13 having a magnetic gap 12 is fitted into the head insertion window 11a of the microcassette 11 together with a tape guide 14, and the tape sliding portion, which is the tip surface of the small protrusion 13, is fitted into the head insertion window 11a of the microcassette 11. Side 1
5 is in contact with the magnetic tape 16 running in the direction of arrow X, and performs an erasing operation in the recording mode.

A head element 17 is composed of a core 18 and a coil 19, as shown enlarged in FIG. The core 18 is made of a two-layer clad material 22 (width 22 mm, length
25 mm) was bent with the cupronickel 21 on the inside to form a loop shape with the ends touching each other, and annealed. The end portions 18a and 18b function as gear spacers by overlapping the cupronickel 21, and the gap length g can be adjusted without using gear spacer parts.
A magnetic gap portion 12 having a diameter of 50 μm is formed. The core 18 includes a straight portion 18c extending straight from the end portion 18a, an inclined portion 18d bent with respect to the end portion 18b, and a parallel portion 18e continuous with this and parallel to the straight portion 18c. , and a connecting portion 18f that connects the parallel portion 18e and the end portion of the above-mentioned 18c.

The coil 19 is wound around a bobbin 23 and attached to the straight portion 18c of the core 18.

This head element 17, as shown in FIG.
It is accommodated in the head element housing space 24a of the head body 24, filled with resin 25, and fixed. The head element 17 has the magnetic gap part 12 exposed to the tape contact surface 15, the straight part 18c disposed on the right side, and the longitudinal axis 19a of the coil 19.
is mounted counterclockwise with respect to a reference line 26 perpendicular to the tape abutting surface 15, that is, at an angle of 15 degrees in the longitudinal direction of the tape and in the direction away from the recording/reproducing magnetic head 30. Therefore, the head element 17 is housed within the head body 24 without protruding to the left side from the surface S including the tape guide 14. As a result, the head main body 24 has a size that does not fit into the space for arranging the recording/reproducing magnetic head 30 on the left side of the surface S, and the erasing magnetic head 10 becomes sufficiently small. Furthermore, the recording/reproducing magnetic head 30 and the erasing magnetic head 10 have a distance D between their respective magnetic gap portions 12a (the other is not shown).
This means that it can be arranged narrower.

Further, since the coil 19 is provided on the straight portion 18c of the core 18 rather than the parallel portion 18e, the coil 19 can be easily attached to the core 18 as described below. That is, as shown in FIG. 3, the core 18 is formed such that the angle α of the bent portion 18g between the parallel portion 18e and the connecting portion 18f is an obtuse angle. The coil 19 is inserted into the center through hole 24a by placing one end of the center through hole 23a of the bobbin 23 in opposition to the end 18a of the core 18 and pulling it down in the direction of arrow A.
8c relatively enters, and the coil 19 is connected to the straight part 1
8c and is installed.

The core 18 to which the coil 19 is attached is inserted into the space 24a of the head body 24 with the end portions 18a and 18b facing forward with the end portions 18a and 18b in contact with each other between both ends. It is accommodated in the main body 24 in a predetermined orientation regulated by a space 24a.

In addition, in Fig. 1, 24b is a head body mounting hole;
27 is a lead wire attachment terminal.

Effects of the Invention As described above, the magnetic head according to the present invention has the following features.

It is no longer necessary to sandwich a separately prepared gear spacer member, and it is sufficient to simply butt both ends of the elongated strip material so that the nonmagnetic layers are in contact with each other, so that assembly work efficiency can be improved.

Since the thickness of the layer made of a non-magnetic material can generally be precisely determined, the gap length can be determined as precisely as when gap spacer members are sandwiched.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional plan view showing one embodiment of the magnetic head according to the present invention in correspondence with a microcassette;
FIG. 2 is an enlarged view of the head element in FIG. 1, and FIG. 3 is a diagram for explaining the method of attaching the coil to the core. DESCRIPTION OF SYMBOLS 10... Erase magnetic head, 12... Magnetic gap portion, 15... Tape contact surface, 16... Magnetic tape, 17... Head element, 18... Core, 18
a, 18b...end part, 18c...straight line part, 1
9... Coil, 20... Permalloy, 21... Cupronickel, 22... Clad material, 23... Bobbin, 24
. . . Head main body, 24a . . . Head element housing space.

Claims (1)

[Claims for Utility Model Registration] A magnetic head having a structure in which the core is formed by bending an elongated strip material into a loop shape, and the coil is fitted in the middle of the elongated strip material bent into the loop shape. , the above-mentioned elongated strip material is placed on one side of the magnetic material strip material,
It has a clad structure with a layer made of non-magnetic material whose thickness is half the thickness of the gap length to be formed over its entire length, and the elongated strip of this clad structure has the layer made of non-magnetic material on the inside. A magnetic head that is bent into a loop shape, and the non-magnetic material layers on both ends of the head are in contact with each other to form a magnetic gap.