JPS598332Y2 - high frequency coil - Google Patents

Description

[Detailed Description of the Invention] The present invention aims to provide a highly reliable high-frequency coil by improving the insulation between the shield case and the terminal.

Generally, high-frequency coils have been constructed as shown in Figure 1.

That is, a terminal 4 connects the lead wire of the coil 1 to a terminal plate 3 that holds an H-shaped core 2 around which the coil 1 is wound at the center of the upper surface.
A core holding mold body 5 is attached to the inner surface of this terminal plate 3.
A dowel 7 is provided in a part of the shield case 6 to connect it to the terminal plate 3, and a threaded portion is formed on the circumferential surface of the core holding mold body 5 inside the shield case 6. It was constructed by screwing together a cap core 8.

With such a structure, since the connection between the terminal plate 3 and the shield case 6 is only through the dowel 7, rattling is likely to occur, resulting in unstable characteristics with a large frequency deviation. .

For this reason, conventionally, as shown in FIG. 2, the folding piece 9 is formed by making cuts in several places at the lower end of the shield case 5 and bending it so as to engage the lower surface of the terminal plate 3. This folding piece 9 connects the terminal board 3 and the shield case 6.
The rattling was gone.

However, this folding piece 9 comes close to the coil lead wire 10 and the terminal 4, which are wrapped around the terminal 4 and soldered.
In particular, after winding the coil lead wire 10 around the terminal 4, the tip of the coil lead wire 10 is cut off, but hairs are likely to occur during cutting, and short circuit accidents may occur between these hairs and the folding piece 9. It was bound to happen.

The present invention eliminates the above-mentioned drawbacks of the prior art.

An embodiment of the present invention will be described below with reference to FIG.

That is, the structure of the high-frequency coil is basically the same as in FIGS. 1 and 2, and the difference is that an insulator 11 is placed inside the folded piece 9.

This insulator 11 may be the core holding mold body 5 or may be a completely separate insulating plate.

In this way, the insulator 11 is interposed between the terminal 4 or the tip of the coil lead wire 10 wired to the terminal 4 and the folding piece 9 of the shield case 6.
A short circuit accident between the terminal 4 or coil lead wire 10 and the shield case 6 can be completely prevented.

Note that the insulator 11 is connected between the shield case 6 and the terminal board 3 at the same time when the shield case 6 is connected to the terminal board 3, and when the shield case 6 is cut, a cut is also made in the insulator 11, and the shield By bending the cut portion of the case 6, the structure shown in FIG. 3 can be obtained.

As described above, since the high frequency coil of the present invention is structured, it is possible to eliminate rattling between the terminal board and the shield case, and also to prevent the folding piece at the lower end of the shield case from collapsing with the terminal or coil lead wire. It can be highly reliable without causing short circuit accidents, and there is no problem even if hairs occur when cutting the tip of the coil leader wire, so productivity can be improved. It has many advantages and is of great practical value.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a general high frequency coil, FIG. 2 is a bottom view of a conventional high frequency coil, and FIG. 3 is a bottom view showing an embodiment of the high frequency coil of the present invention. 1... Coil, 3... Terminal board, 4...
... Terminal, 5 ... Core holding mold body, 6
...Shield case, 7...Dowel, 8
...Cap core, 9...Folding piece, 1
0... Coil lead wire, 11... Insulator.

Claims (1)

[Scope of utility model registration request] In the case of a high-frequency coil in which a shield case is placed over a terminal board equipped with a coil, a part of the lower end of the shield case is folded into the bottom surface of the terminal board, and the shield case is bonded to the terminal board, the shield case is placed on the bottom surface of the terminal board of the shield case. A high-frequency coil made by interposing an insulator on the inner surface of a folded piece.