JPS6341602Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head, and more particularly to a magnetic erasing head for erasing images of a VTR.

Recently, there has been an increasing demand for this type of magnetic erase head to be smaller and lower in cost. However, conventional magnetic erase heads of this type have a structure in which the head core is placed inside a pre-formed case, and the inside of the case is then molded if necessary, which limits miniaturization and requires a large number of manufacturing steps. It was also difficult to reduce costs.

For this reason, the present applicant has proposed a magnetic head in which a case is constructed by sealing a head main body portion with a wire wound around the core with resin.

1 to 3 show a magnetic head previously proposed by the present applicant. In this case, first, as shown in Fig. 1, winding 3 is wound around a bobbin 2 that integrally has a terminal pin 1, and this is inserted into a front core 4 made of ferrite or the like, and then a back core 5 made of ferrite or the like is attached to the front core 4. Join and integrate. The head main body 6 thus formed is placed in a mold, and a case 7 is formed by resin molding to cover the head main body 6 except for the tape sliding surface, as shown in FIG. At this time, the mounting nut 8 is integrally fixed to the case 7 by a so-called insert mold. Thereafter, the portion of the front core 4 protruding from the case 7 is ground and polished to form two gaps G on the tape sliding surface 9 as shown in FIG.

By the way, with the above configuration, when the nut 8 is integrally insert-molded into the case 7 as shown in FIG. There was a drawback that it could easily get wrapped around the threaded portion 11 of the screw. As shown in Fig. 4, resin 1 is attached to the threaded part 11 of the mounting nut 8.
If wrap-around (2) occurs, it will be difficult to deburr and the product will be defective and cannot be fixed with screws.

In view of the above points, the present invention has developed a magnetic head that can be securely fixed with screws by arranging the mounting nut to prevent resin from getting around the threaded part of the mounting nut when forming a case by resin sealing. This is what we are trying to provide.

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

In FIG. 5, the mounting nut 8A is integrally attached to the case 7 by resin sealing of the case so that the tip protrudes from the bottom surface of the nut placement recess 20 formed in the pedestal mounting surface 21 of the case 7. Fixed. (However, from the pedestal mounting surface 21, the nut 8
Try not to get an A. ) If the tip of the nut 8A protrudes from the bottom of the case side recess 20 in this way, the mold 10 when forming the case 7 by resin sealing
Since the path of the gap between A and the nut 8A is long and curved, the resin that is the molding material of the case 7 stops before reaching the threaded portion 11A of the nut 8A. As a result, it is possible to prevent the resin from entering the threaded portion 11A and resulting in a defective product.

Note that the other structures are the same as the conventional structure shown in FIGS. 1 to 3.

In the above embodiment, the mounting nut is provided on one end surface of the case, but the arrangement of the nuts can be changed as appropriate depending on the shape of the case, and the number of nuts can also be two or more. You can also do it.

As explained above, the magnetic head of the present invention is
In order to prevent the resin from getting around to the threaded part of the mounting nut during resin sealing, the mounting nut is mounted with a step in which the tip of the mounting nut protrudes from the bottom of the recess for placing the nut on the case side, so that the threaded part of the mounting nut can be easily cut. This has the advantage that it can be securely fixed with screws that are screwed into the parts.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the main body of a magnetic head previously proposed by the present applicant, and FIG. 2 is a perspective view showing the state before the front core is ground and polished.
FIG. 3 is a front view after polishing the tape sliding surface, FIG. 4 is an enlarged sectional view of the main part, and FIG. 5 is an enlarged sectional view of the main part of an embodiment of the magnetic head according to the present invention. 3...Winding, 4...Front core, 5...Back core, 6...Head body, 7...Case,
8, 8A... Mounting nut, 9... Tape sliding surface, 10, 10A... Mold, 11... Threaded portion, 12... Resin, 20... Recessed portion for nut placement.

Claims (1)

[Scope of utility model registration request] In a magnetic head in which a case is constructed by sealing a head main body with a wire wound around the core with resin except for the tape sliding surface, a mounting nut is inserted into a recess for nut placement formed on the mounting surface of the case. A magnetic head, characterized in that the tip protrudes from the bottom surface and is fixed to the case by the resin sealing so as not to protrude from the mounting surface.