JPS5919944Y2 - magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure in which two cores of a magnetic head are combined.

Conventionally, the structure of the core of a DC erasing magnetic head, etc. has been based on a core 1 made by bending a single magnetic plate, as shown in FIG.
Alternatively, as shown in FIG. 2, it is formed by combining two abbreviated cores 2 and 3.

However, with the core 1 made of one piece in FIG. 1, it is troublesome to attach the coil bobbin (not shown), and the core 1 must be bent when attached, which significantly deteriorates its magnetic properties. There are some drawbacks.

In the structure shown in FIG. 2, the bottom plate parts 2a and 3a of each core 2 and 3 are inserted into the hole part 5a of the coil bobbin 5 around which the coil 4 is wound.
Furthermore, the bottom plate parts 2a and 3a of the core 2.3 are pressed by the spring spacer 6 inserted into the hole part 5a.

Therefore, the inner diameter of the hole 5a of the coil bobbin 5 becomes larger, and as a result, the space for winding the coil 4 becomes smaller.

Another disadvantage is that the bottom plate portions 2a and 3a of the cores 2 and 3 must be joined in the hole portion 5a of the coil bobbin 5 to form the rear gap 7, which is difficult to assemble.

The present invention aims to eliminate the above drawbacks, provide a magnetic head that is easy to combine and has stable characteristics.

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. A protrusion 2b is formed.

On the other hand, the core 3 is provided with a hole 3a at a position corresponding to the protrusion 2b, so that when both cores 2 and 3 are combined, the protrusion 2b fits into the hole 3a.

Therefore, to explain how to assemble the cores 2 and 3 and the coil bobbin 5, first insert the bottom plate 2a of one of the cores 2 into the hole 5a of the coil bobbin 5, and then insert the bottom plate 2a of one of the cores 2 into the hole 5a of the coil bobbin 5. The hole 3a of the other core 3 is fitted, and both cores 2 and 3 are butted against each other to form front and rear gaps 8 and 7, and then assembled.

The core 2.3 and the coil bobbin 5 are assembled into a case (not shown) and fixed with resin to form a magnetic head.

As mentioned above, in the present invention, only the bottom plate part 2a of one core 2 is inserted into the hole part 5a of the coil bobbin 5, so the size of the hole part 5a of the coil bobbin 5 can be made small, and the coil 4 Wrapping can increase the space.

Further, since the rear gap 7 is formed by fitting the protrusion 2b of one core 2 protruding outward from the hole 5a of the coil bobbin 5 into the hole 3a of the other core 3, both cores 2, The combination of 3 is extremely simple, and the combination and properties are also extremely stable, resulting in remarkable practical effects.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional core, Fig. 2 is a cross-sectional side view of main parts showing the state of connection between a conventional core and a coil bobbin, and Fig. 3.
FIG. 4 relates to the magnetic head of the present invention, FIG. 3 is an exploded perspective view of the core, and FIG. 4 is a sectional side view of a main part showing a state in which the core and the coil bobbin are connected. 2... One core, 2a... Bottom plate portion, 2b... Protrusion portion, 3... Other core, 3a... Hole portion, 5...
Coil bobbin, 5a...hole, 7...rear gap.

Claims (1)

[Scope of utility model registration request] A protrusion is provided on the bottom plate of one of the abbreviated cores, a hole is formed in the other abbreviated core, the bottom plate is inserted into the hole of the coil bobbin, and the coil is passed from the hole to the outside. A magnetic head characterized in that a rear gap is formed by fitting the hole into the protrusion.