JPS6127148Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a high frequency coil in which slits are provided on the side surface of a shield case and the coil is pushed inward between the slits to firmly hold the cap core and stabilize its characteristics.

Conventional high-frequency coils have been constructed as shown in FIGS. 1 and 2.

That is, in the case shown in FIG. 1, a hollow bobbin 4 having a flange 3 on the upper part is integrally provided in the center of a terminal plate 2 on which a terminal 1 is implanted, and this flange 3 and the terminal plate 2 are connected to each other.
Wind the coil 5 around the bobbin 4 between the tsuba 3 and
A cap core 7 having a cap shape and a through hole 6 formed in the center of the upper surface that fits into the upper end of the bobbin 4 is fitted into the cap core 7, and a core supporter 9 made of synthetic resin or the like is arranged on the inner surface of a shield case 8 that covers the entire cap core 7. Top surface with tsuba 3 and shield case 8
The cap core 7 was held between the upper surfaces of the cap core 7 and the peripheral surface of the cap core 7 was held by a core supporter 9.

With this configuration, since the core supporter 9 is made of synthetic resin, deterioration occurs over time, and the cap core 7
The drawback was that the long-term retention of the water became unstable and the performance deteriorated.

Furthermore, in the case shown in FIG. 2, in place of the core supporter 9 in FIG. 1, an inwardly cut and raised piece 10 is provided on the side surface of the shield case 8 to hold the cap core 7. Although it has the advantage of having fewer parts and less deterioration over time than the one shown in Fig. 1, the holding force is weak because the cap core 7 is only partially held by the cut and raised pieces 10.
A gap is formed between the shield case 8 and the cap core 7, which causes backlash and reduces performance. Therefore, the cap core 7 is held with adhesive or the like, but this also has poor workability. This was also disadvantageous in terms of cost.

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

Embodiments of the present invention will be described below with reference to FIGS. 3 to 6.

Reference numeral 11 denotes a terminal board in which a plurality of terminals 12 are implanted, and a hollow bobbin 15 having a lower end flange 13 and an upper flange 14 is integrally provided at the center of the upper surface of this terminal board 11. is wound around the hollow bobbin 15, and a screw core 17 is screwed into the inside of the hollow bobbin 15.

The upper flange 14 of the hollow bobbin 15 has a cap core 19 formed with a through hole 18 in the center of the upper surface into which a cylindrical portion above the upper flange 14 of the hollow bobbin 15 is fitted.
is inserted and locked.

The whole is covered with a shield case 20, and the ceiling of this shield case 20 is also provided with a through hole 21 into which the upper end of the hollow bobbin 15 is fitted, and two slits 22, 2 are provided on both sides.
An extruded portion 24 is formed by extruding the side walls between the caps 3 and 3 so as to protrude inwardly, and this extruded portion 24 presses and holds the circumferential surface of the cap core 19. Further, a horizontal notch 25 is formed in the lower part of this extrusion portion 24, and this notch 25 has a height that matches the lower end surface of the cap core 19, so that the portion of this notch 25 enters the lower end surface of the cap core 19. The lower end surface of the cap core 19, which is sandwiched between the upper flange 14 and the ceiling surface of the shield case 20, also has this notch 25.
It is supported by the inwardly curved portion 26.

Note that the upper and lower ends of the extrusion portion 24 are connected to the cap core 19.
The extruded portion 24 is formed to protrude inwardly with an inclination 27 to facilitate insertion, and is pressed against the peripheral surface of the cap core 19. Conversely, the extruded portion 24 is curved outward and pressed against the circumferential surface of the cap core 19.

Figure 4 shows the slit 22 of the shield case 20,
23, is a perspective view of a state in which a notch 25 is provided,
FIG. 5 is a bottom view showing the state in which the extruded portion 24 is formed by pushing inward between the slits 22 and 23.
FIG. 6 is a bottom view of a state in which the cap core 19 is press-fitted, and the lower end surface of the cap core 19 is held by the inwardly curved portion 26 formed by the notch 25 and the ceiling surface.

As the high-frequency coil of the present invention is constructed as described above, the circumferential surface of the cap core is held elastically and firmly by the extruded part between the slits of the shield case, and there is no wobbling in the vertical direction. The material is extremely strong and stable due to the clamping between the upper flange of the hollow bobbin and the ceiling surface of the shield case, and the support provided by the inwardly curved part created by the notch in the extruded part, and there is no deterioration due to changes over time. It is extremely stable in terms of characteristics, and since only the processing is added to the shield case, it is advantageous in terms of cost and has great practical value.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views of a conventional high-frequency coil, Figure 3 is a cross-sectional view of an embodiment of the high-frequency coil of the present invention, and Figure 4 is a perspective view of a shield case used in the high-frequency coil during processing. 5 is a bottom view after the same processing, and FIG. 6 is a bottom view of the shield case with the cap core assembled. 11...Terminal board, 12...Terminal, 13...Lower end collar, 14...Upper collar, 15...Hollow bobbin, 16
...Coil, 17...Screw core, 18...Through hole,
19...Cap core, 20...Shield case, 21...Through hole, 22, 23...Slit, 2
4...Extruded portion, 25...Notch, 26...Curved portion, 27...Inclination.

Claims (1)

[Scope of utility model registration request] A coil bobbin having a flange on the upper part is erected on a terminal board provided with a terminal, a coil is wound around this coil bobbin, and the coil part is covered with the upper flange of the coil bobbin and the ceiling surface of a shield case that covers the entire body. In the high-frequency coil, which is formed by sandwiching the upper surface of the cap core that is incorporated into the shield case, two slits are provided in the height direction at a constant interval on both sides of the shield case, and the space between the slits is pushed inward. This is an extruded part that presses against the circumferential surface of the cap core, and a horizontal notch is provided in the part of this extruded part that corresponds to the lower end surface of the cap core, and the curved part is curved inward by this notch and locks the lower end surface of the cap core. A high frequency coil.