JPS6319932Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a composite magnetic head, and in particular to a VTR that integrates a recording/playback head section and an erasing head section.
This invention relates to a composite magnetic head for audio. Generally VTR
A composite magnetic head for audio uses a structure in which an erasing head is screwed onto the side surface of a recording/reproducing head.

Figure 1 shows a conventional example of such a structure.
is formed, and the erasing head section 4 is screwed to the side surface of the recording/reproducing head section 1 with screws 5. In this case, the recording/playback head section 1 is
As shown in the figure, a head core 10 is provided with a coil 11, and the head core 10 is supported and fixed by a shield block 12 fixed to the tape sliding surface on the front surface of the case.

By the way, with the above structure, case 2
is made of permalloy etc. for magnetic shielding, and its thickness is not very large, so
The screw hole 3 provided in this case 2 is easily broken,
It is difficult to increase the tightening torque sufficiently when attaching the erasing head section 4 with the screws 5. Furthermore, a tapping process is required to form the screw holes 3 in the case 2 in advance, which tends to increase the number of manufacturing steps.

In view of the above points, the present invention provides a structure in which the first head part is fixed to the side surface of the second head part.
The second head has a structure in which a holder supports and fixes the head core to the case, and a self-tapping screw is screwed into the holder to fix the first head, thereby integrating both head parts. The object of the present invention is to provide a composite magnetic head that can easily and reliably carry out the process, has excellent mass productivity, and can reduce costs.

Embodiments of the composite magnetic head according to the present invention will be described below with reference to the drawings.

In FIGS. 3 to 5, the recording and reproducing head section 1A has a configuration in which a front section 10A of a head core 10 having a coil 11 and a shield block 12A are supported and fixed in a case 2A using a holder 20 made of zinc die-casting or the like. It is. The erasing head section 4A has a structure in which a head core 31 having a coil 30 is supported and fixed to a case 32 by a dummy block 33, and has a through hole 34 through which a self-tapping screw 40 is inserted. Here, a round recess 35 into which the head of the self-tapping screw 40 is inserted is formed around the through hole 34. on the other hand,
A through hole 21 that matches the through hole 34 is formed in the case 2A of the recording/playback head 1A, and a mounting hole 22 with a diameter slightly smaller than the self-tapping screw 40 is provided in the holder 20 concentrically with the through hole 21. It is formed. Then, the through hole 3 of the erasing head section 4A
4, and then insert the self-tapping screw 40 into the recording/playback head section 1.
By screwing into the mounting hole 22 of the holder 20 on the A side, both head portions 1A and 4A are tightened and integrated.

According to the above embodiment, the self-tapping screw 40 passing through the erasing head section 4A is screwed into the mounting hole 22 of the holder 20 on the side of the recording/playback head section 1A, thereby integrating both the head sections 1A and 4A. Because of this, the installation work is simple, and the positional relationship between the two heads can be accurately defined with just one screw. Further, since the holder 20 has a sufficient wall thickness, a sufficient tightening torque can be secured compared to the case where a screw hole is formed in the case itself. Furthermore, since there is no need to form screws in advance on the recording/reproducing head side, it is easy to manufacture, has excellent mass productivity, and can reduce costs.

Note that the number of channels and internal structure of the recording/reproducing head section and the erasing head section can be changed as appropriate. Furthermore, an adhesive may be used in conjunction with the erasing head, if necessary, to prevent rotation of the erasing head.

As explained above, according to the present invention, both head parts are tightened by screwing the self-tapping screw that passes through the second head part into the holder that supports and fixes the head core to the case in the first head part. It is possible to obtain a composite magnetic head that can be attached and integrated, is easy to manufacture, has excellent mass productivity, and can reduce costs.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing a conventional composite magnetic head, Fig. 2 is a plan sectional view showing the structure of the recording/playback head section in the conventional compound magnetic head, and Fig. 3 is an implementation of the compound magnetic head according to the present invention. FIG. 4 is an exploded perspective view showing an example, FIG. 4 is a sectional view thereof, and FIG. 5 is an exploded perspective view showing a structure for fixing the front part of the head core to the holder. 1, 1A...Recording and playback head section, 2, 2A, 3
2... Case, 4, 4A... Erase head section, 1
0,31...Head core, 11,30...Coil, 12,12A...Shield block, 20...
...Holder, 21...Through hole, 22...Mounting hole, 33
...Dummy block, 34...Through hole, 35...
Round recess, 40...Self-tapping screw.

Claims (1)

[Scope of utility model registration request] In a composite magnetic head in which a first head part is fixed to a side surface of a second head part, the first head part has a through hole through which a self-tapping screw is inserted, and the second head part has a holder. The head core is supported and fixed to a case using a screwdriver, a through hole through which the self-tapping screw is inserted is formed in the case, and a mounting hole smaller than the diameter of the screw is formed in the holder, and the first A composite magnetic head, characterized in that the head portion is fixed to the second head portion by screwing the self-tapping screw into the mounting hole of the holder.