JPH0110887Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a high-frequency coil that is made difficult to dislodge from the groove when the lead of the winding wound around the bobbin is pulled out from the groove provided in the collar of the coil.

Figure 1 shows a closed magnetic circuit type in which a bobbin 1 with a base is provided with three flanges 2, a winding 3 is wound between the flanges 2, and the tip of the bobbin 1 is fitted into a hole 5 on the top surface of a pot core 4. FIG. 2 is a partially cross-sectional side view showing a conventional high-frequency coil. The cross section shows a groove provided in the collar 2, and 8 is a screw core for adjusting inductance. These days, this kind of high frequency coil has 5 on each side.
The size is reduced to such an extent that it fits into a cube of mm, and the portion of the collar 2 protruding around the bobbin 1 may be less than 1 mm. In such a case, after winding the winding 3, the lead 6 is passed through the groove provided in the collar 2 to the base side.
When connecting lead 6 to terminal pin 7,
Because of the winding 3, it was easy to come off from the shallow groove, which made workability during the manufacture of high-frequency coils worse.

The purpose of this invention is to solve such technical problems with conventional small-sized high-frequency coils, and the outer diameter of the bobbin is made larger as the flanges of the bobbin into which the screw core is screwed are located lower. The high frequency coil is characterized by:

The following is a second example of the high frequency coil of the present invention.
This will be explained with reference to the figures and FIG. FIG. 2 is a partially sectional side view, and FIG. 3 is an exploded perspective view. Note that in FIG. 2, the case of the high frequency coil is omitted.

In FIGS. 2 and 3, 10 is a bobbin with a base made of synthetic resin, 11 to 13 are collars, 14 is a pot core, 15 is a metal case, and 16 is a terminal pin.

In the bobbin with base 10, a cylindrical bobbin part 26 around which a winding 18 is wound is integrally formed on a base part 17, and a terminal pin 16 is implanted under the base part 17. The bobbin part 26 has a tsuba 11 and a tsuba 1.
2. A collar 13 is formed, and each collar has a bobbin portion 2.
A groove 19 reaching the periphery of the bobbin portion 26 is formed at a position opposite to the bobbin portion 26 with the groove 6 in between. A winding 18 is wound between the collars, and its leads 20 are drawn out under the base part 17 through the groove 19 and connected to the terminal pins 16. The outer diameter of the circular tsuba is increased as it goes lower, with tsuba 11 being the smallest and tsuba 13.
is the largest. In addition, the winding 18 wound between the brim
is represented by a dashed line in FIG. 3, and its outer diameter does not exceed the outer diameter of the upper collar. A screw core 23 is screwed into the inside of the bobbin portion 26. The cylindrical pot core 14 is open at the bottom and has a hole 22 on the top surface 21, and is made of sintered ferrite. It covers the winding 18 of the bobbin 10 with a base. Also, the inner diameter is increased toward the bottom. The case 15 covers the pot core 14 and fits into the base portion 17 of the base-equipped bobbin 10. 24 is a hole for adjusting the screw core 23, and 25 is a lug for grounding.

The high frequency coil of the present invention configured in this way has an outer diameter larger as the lower collars are located, and the amount of winding wire 18 that can be wound between the collars is determined by the outer diameter of the upper collars. Determined by the outer diameter. Even when the most number of turns are made, the outer diameter of the upper tsuba will not be exceeded. Therefore, the lower tsuba, which has a larger outer diameter than the upper tsuba, has a groove 19 that is deeper than the upper tsuba because it leaves room on the outside of the winding 18.
The leads 20 pulled out downward are difficult to come off from the grooves 19, and workability during manufacturing is improved. Furthermore, since the inner diameter of the pot core 14 is increased toward the bottom and the cross section is made wider, when the screw core 23 is moved up and down, the distance between the inner surface of the pot core 14 and the screw core 23 is changed, and the inductance can be varied within a variable range. can be made wider. In this case, by increasing the outer diameter of the collar from top to bottom, the thickness of the pot core 14 can be made thicker as it goes upward. Therefore, even in the case of an extremely small harmonic coil, there is an advantage that the strength of the pot core 14 can be maintained sufficiently.

It should be noted that the present invention is not limited to the embodiments, and it is obvious that it can be applied to a high frequency coil without a pot core 14 or case 15. Further, although the bobbin 10 with a base is used, the base and the bobbin portion may be separate bodies, and in short, the present invention can be applied to any high-frequency coil in which a plurality of flanges are formed on the bobbin around which the winding is wound. Furthermore, it goes without saying that the shape of the collar and the cross-sectional shape of the bobbin portion around which the winding wire 18 is wound may be round or square.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view showing a conventional high frequency coil, Fig. 2 is a partially sectional side view showing an embodiment of the high frequency coil of the present invention, and Fig. 3 is an exploded perspective view of the high frequency coil of the present invention. be. 1, 10...Bobbin with base, 2, 11, 1
2, 13... Tsuba, 3, 18... Winding wire, 4, 14...
... Pot core, 5, 22 ... Hole, 6, 20 ... Lead, 7, 16 ... Terminal pin, 8, 23 ... Screw core, 15 ... Case, 17 ... Base part, 19
... Groove, 21 ... Upper surface, 24 ... Hole, 25 ... Lug, 26 ... Bobbin section.

Claims (1)

[Claims for Utility Model Registration] (1) The outer diameters of the flanges of the bobbin into which the screw core is screwed are made larger as they move downward, and the flanges are provided with grooves that reach the periphery of the bobbin, A high-frequency coil characterized in that the outer diameter of the winding wound between the brim does not exceed the outer diameter of the upper brim. (2) The harmonic coil according to claim 1, wherein the bobbin is fitted into the pot core.