JPS6266611A - High frequency coil - Google Patents

Abstract

PURPOSE:To effectively hold a terminal board by means of simple structure by forming an elastic tongue piece bent inward on the upper surface of a shielding case, and forming an elastic tongue piece bent toward an inward upper surface near the opening edge of the case. CONSTITUTION:A coil bobbin 10 is formed on a terminal board 9 to which terminals 8 are inserted, a shielding case 11 is coated on the bobbin 10, a threaded core 10 is inserted into the bobbin hollow portion 12, and core 13 is moved upward or downward to vary the inductance of a coil 14. A cutout 15 is formed toward the center on the upper surface of the case 11, and an elastic tongue piece 16 bent inward at the center is formed. An elastic tongue piece 17 bent toward an inward upper surface is formed substantially on the position of the bottom of the board 9 in the lower portion of the case 11, and the bottom of the board 9 is engaged with the end stopper 17' of the piece 17. The upper surface of a bobbin collar 18 is pressed down by the elastic force of the piece 15. Thus, since the board 9 can be stably and effectively held by means of a simple structure and the board 9 is pressed by the elastic force, no fluctuation occurs.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a high frequency coil having a variable inductance mechanism used in electronic equipment such as televisions and videos.

2. Description of the Related Art Conventionally, this type of high-frequency coil was developed, for example, in
As shown in Publication No. 74.6, it had a structure as shown in Figure 3.

In other words, the coil bobbin 3 is placed on the terminal board 2 on which the terminal 1 is implanted.
, and its co-il bobbin 3 shield case 4
In the high-frequency coil, the screw core 6t is screwed and inserted into the bobbin hollow part 5 formed on the coil bobbin 3, and the screw core θ is moved up and down to vary the inductance of the coil part 7 wound around the bobbin 3. The stepped portion 2' is fully formed, and the step portion 2' is locked by an inwardly protruding portion 4' provided on the shield case 4, and the upper surface of the upper leg of the coil bobbin 3 attached to the terminal plate 2 is shielded. The terminal board 2 was completely fixed by coming into contact with the ceiling of the case 4.

Problems to be Solved by the Invention However, with such a structure, it is difficult to completely attach the terminal board 2 due to the dimensional accuracy from the ceiling of the shield case 4 to the protrusion 4' and the shape of the protrusion 4'. There was a risk that it would cause damage.

Therefore, one aspect of the present invention is to fit the terminal board and the shield case with an extremely simple structure and to hold the terminal board stably and reliably even if the dimensional accuracy from the ceiling part to the protruding part of the shield case is not achieved. It is something.

Means for solving the problems and technical means of the present invention for solving the above problems are as follows:
A notch is formed in the upper surface of the shield case toward the center, and an elastic tongue piece bent inward is provided, and an elastic tongue piece bent inwardly toward the upper surface is provided near the opening edge of the shield case. This is what I did.

action The effect of this technical means is as follows.

In other words, by making the distance from the elastic tongue on the top of the shield case to the elastic tongue bent inward toward the upper surface near the opening edge shorter than the distance from the top surface of the bobbin flange to the bottom of the terminal plate, the bobbin flange The elastic tongue piece is pressed downwardly by the elastic force, and the terminal plate bottom is pressed upwardly by the elastic force of the lower elastic tongue piece. Therefore, the terminal board does not wobble.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings.

In FIG. 1, a coil bobbin 1ot is formed on a terminal plate 9 in which a terminal 8 is implanted, a shield case 11 is placed over the coil bobbin 10, and a screw core 13 is screwed and inserted into a bobbin hollow portion 12 formed in the coil bobbin 10. 13 is wound around the bobbin 10 by vertical movement.
It has a structure in which the inductance of the inductance is variable.

A notch 16 is formed on the top surface of the shield case 11 toward the center.
is provided, and the center portion thereof is bent inward to form an elastic tongue piece 16. An elastic tongue piece 17 bent inwardly and upwardly is provided at the lower part of the shield case 11 at a position approximately at the bottom of the terminal plate 9, and the bottom part of the terminal plate 9 is engaged with the end stop portion 17' of the elastic tongue piece 17. Stop. Further, the elastic force of the elastic tongue piece 16 presses the upper surface of the bobbin collar 18 downward.

FIG. 2 shows a perspective view of the same high-frequency coil.

That is, when attaching the terminal plate 9 to the lower part of the shield case 11, the terminal plate 9f is attached from below the shield case 11.
When inserted, the elastic tongue piece 17 bent toward the inner upper surface of the shield case 11 is pressed against the side surface of the terminal plate 9, and the elastic tongue piece 17 is bent toward the inner wall side of the shield case 11. Even after the upper surface of the bobbin collar 18 comes into contact with the tip of the upper elastic tongue piece 16 of the shield case 11, the terminal plate 9'
f. When pushed in, the lower elastic tongue piece 17 which was pressed and bent returns to its original position and is locked to the bottom of the terminal plate 9.

The upper elastic tongue piece 16 of the shield case 11 constantly presses the upper surface of the bobbin collar 18 downward, so that the terminal plate 9 is firmly held without wobbling.

Effects of the Invention The present invention has an extremely simple structure, can hold the terminal board stably and reliably, and since the terminal board is pressure-welded with elastic force, it does not cause looseness and is extremely superior in terms of quality. It is of great practical value.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a high-frequency coil according to an embodiment of the present invention, FIG. 2 is a perspective view of the same high-frequency coil, and FIG. 3 is a sectional view of a conventional high-frequency coil. 8...terminal, 9...recommendation board, 10...
... Coil bobbin, 11 ... Shield case, 12 ... Bobbin hollow part, 13 ...
Screw core, 14... Coil part, 16...
・Incision, 16...Elastic tongue piece, 17...
・Elastic tongue piece, 17'...stop part, 18...
...Bobbin tsuba.

Claims (1)

[Claims] It is constructed by attaching a terminal board with a terminal attached to the lower part of a coil bobbin wound with a coil, covering it with a shield case, and screwing the core into the hollow part of the coil bobbin. A notch is formed to form an elastic tongue that is bent inward, and the upper surface of the coil bobbin is brought into contact with the tip of this elastic tongue, and the lower surface of the terminal plate is placed near the opening edge of the shield case and the inner upper surface is A high-frequency coil that is secured with elastic tongues bent in opposite directions, and a terminal board is held between the upper and lower elastic tongues.