JPH0480442B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a magnetic head device, and more particularly to a composite magnetic head device in which two magnetic heads are connected with a screw.

[Prior Art] A magnetic head device comprising two magnetic heads coupled together is constructed as shown in FIG. 1, for example.
In the figure, a recording/playback head 1 is connected to an erasing head 2 by a screw 3, and a recording/playback head 1 is connected to an erase head 2 by a screw 3.
is provided with an audio core 4 and a control core 5, and the erasing head 2 is further provided with an erasing head 6. A composite magnetic head device constructed in this manner is used, for example, as a head for VTR audio.

In FIG. 2, the recording and reproducing head 1 of FIG. The core support 8 is shown exposed. core support 8
is provided with a female screw 9 as shown in the figure,
This is coupled with a screw 3 passing through the erasing head 2 shown in FIG. FIG. 3 shows the recording/reproducing head 1 in cross section, with terminal conductors 10a,
A magnetic head element body consisting of cores 10b, cores 12a and 12b, and a coil 11 wound thereon is supported by core supports 8a and 8b, and this is supported by a leaf spring 1 disposed between core support 8b and case 7.
3, the core support 8a and the case 7 are pressed so that they come into close contact with each other. Next, in this state, a resin (not shown) for fixing the core supports 8a and 8b is injected into the case 7 from the back side (upper side of the figure) of the case 7, but the case 7 and the core supports 8
Since there is a small gap A (approximately 0.05mm) between a,
There was a drawback that the resin passed through the gap C and flowed into the female thread 9. Therefore, the conventional recording/playback head is
As shown in the figure, before resin injection, insert the resin inflow stop screw 1.
4 was attached and removed after the resin had hardened (since the screws 14 were coated with a release agent, they could be easily removed even after hardening).

Therefore, the conventional recording and reproducing head has the disadvantage that the process of attaching the resin inflow stopper screw 14 and removing it again after hardening is complicated, and the number of steps is unnecessarily increased.

[Objective] Therefore, the present invention has been made to eliminate such conventional drawbacks, and it is an object of the present invention to provide a magnetic head device that can connect two magnetic heads in a simple and reliable manner. The purpose is to

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

FIG. 5 shows a core support for a recording/playback head of a magnetic head device according to an embodiment of the present invention. In this figure, parts similar to those in Figures 1 to 4 are given the same reference numbers.
The explanation will be omitted. The other parts other than the core support are similar to the embodiments shown in FIGS. 1 to 4.

As shown in FIGS. 5A and 5B, a groove 15 is provided around the female thread 9 over its entire circumference. When resin is injected into the case 7, the resin that is about to flow into the female screw 9 is guided into the groove 15, and the resin that enters the female screw 9 is blocked. According to experiments, the width E and depth F of the groove 15 were both 0.3 mm, and sufficiently good results were obtained. It goes without saying that the inner diameter D of the groove 15 is larger than the hole B of the case shown in FIG.

The region of the groove 15 described above does not necessarily need to be provided on the entire circumference of the female screw 9, and may be provided on a part or most of it, and furthermore, the depth and shape of the groove 15 are limited to the embodiments described above. It is not something that
Of course, other shapes or other depths may be used.

[Effects] As explained above, according to the present invention, a ring-shaped groove is provided on the outer periphery of the female screw to be provided in the core support of the magnetic head to be coupled.
With a very simple structure, it is possible to eliminate the process of attaching and removing screws for stopping resin inflow, and as a result, it is possible to obtain a magnetic head device that can be manufactured with a reduced number of processes.

[Brief explanation of the drawing]

Figures 1 to 4 show examples of conventional magnetic head devices, with Figure 1 being a perspective view showing two magnetic heads coupled together, and Figure 2 being a part of a recording/playback head. A broken perspective view, Fig. 3 is a sectional view showing the internal structure of the case, Fig. 4 is a sectional view showing the state in which the screw for preventing resin inflow is attached, and Figs. 5 A and B.
FIG. 5A is a plan view showing a state in which a groove is provided in the female threaded portion, and FIG. 5B is a cross-sectional view thereof, showing an embodiment of the present invention. 1... Recording/playback head, 2... Erasing head,
3...screw, 4...audio core, 5...control core, 6...erasing core, 7...case, 8a,
8b...Core support, 9...Female screw, 15...
groove.

Claims (1)

[Claims] 1. In a magnetic head device in which a core support holding a core is housed in a case and the core support is fixed with resin filled in the case, a hole is provided in the side surface of the case for inserting a screw, A female screw is provided on the side surface of the core support in a portion facing the hole, and a ring-shaped groove having an inner diameter larger than the hole is provided on the outer periphery of the female screw, and the groove is filled into the case and connected to the case. A magnetic head device characterized in that the groove blocks resin flowing between the core supports from flowing into the female screw.