JPS6035282Y2 - helical filter - Google Patents

Description

[Detailed description of the invention] The present invention involves winding a helical coil around a bobbin having multiple flanges, providing an outward protrusion on the flanges of the bobbin, and fixing a wiring lead wire to this protrusion. The purpose of this invention is to provide a helical filter with reduced variation.

As shown in FIG. 1, a conventional helical filter consists of winding a helical coil 2 or a helical coil 2 and a coupling coil 3 around a cylindrical bobbin 1, and winding this with a terminal plate 4.
Several terminals were erected on the top and connected to terminals 5 provided on a terminal board 4 by wiring lead wires 6.

In this configuration, if the distance between the wiring lead 6 and the helical coil 2 is not constant, the distributed capacitance between the helical coil 2 and the wiring lead 6 will change, which will increase the variation in the characteristics of the helical filter. There was a fatal flaw.

For this reason, conventionally, as shown in FIG. 2, a spacer 7 having a circular coupling hole is coupled to a bobbin 1 fixed on a terminal plate 4 and wound with a helical coil 2, etc., and the wiring lead 6 A device in which the distance between the helical coil 2 and the helical coil 2 is maintained constant has been developed, but it has drawbacks such as requiring time and effort to incorporate the spacer 7 and being disadvantageous in terms of cost due to the spacer 7.

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 9.

First, in FIG. 3, reference numeral 8 denotes a terminal plate on which terminals 9 are implanted, and helical elements 10 to 12 are erected on this terminal plate 8.

The helical elements 10 and 12 at both ends are constructed by winding a helical coil 15 and a coupling coil 16 on the uppermost stage around a split bobbin 14 having a plurality of flanges 13, and the helical element 11 at the center is constructed by winding a helical coil 15 and a coupling coil 16 around the same split bobbin 14. It is constructed by winding only 15 pieces.

As shown in FIG. 4, the split bobbin 14 has a cylindrical body 17 with a large number of disc-shaped flanges 13 formed at regular intervals, and a slit 18 for passing the windings on the side facing the flanges 13. A projecting piece 19 is provided on the peripheral edge of the collar 13 so as to extend the slit 18.

Then, the wiring lead 20 is pulled out along this protruding piece 19 and connected to the terminal 9 through the wiring groove 21 on the side surface of the terminal board 8.

When pulling out two wiring leads 20, they are pulled out along the protruding pieces 19 on both sides of one of the slits 18 as shown in FIG. The helical filter shown in FIG.

Further, as shown in FIGS. 8 and 9, a notch 22 is provided on the outer surface of the protruding piece 19 in which the wiring lead 20 is inserted and positioned.
It is also possible to have a configuration in which

In this way, the coil bobbin is made into a split bobbin 14, and the protruding piece 19 for hooking and positioning the wiring lead 20 is provided on the periphery of the collar 13, so that the distance between the helical coil 15 and the wiring lead 20 can be kept constant. helical coil 15
The distributed capacitance between and the wiring lead 20 becomes stable,
Characteristics can be made uniform.

Since the helical filter of the present invention is constructed as described above, the distance between the wiring lead and the helical coil is maintained constant by the protruding piece provided on the collar without using any separate parts, and the characteristics are extremely stable. It is easy to assemble, and it is extremely advantageous in terms of cost, so it is of great practical value.

[Brief explanation of the drawing]

1 and 2 are front views showing a conventional helical filter, FIG. 3 is a front view showing an embodiment of the helical filter of the present invention, and FIG. 4 is a perspective view of a coil bobbin used in the helical filter. Fig. 5 is a perspective view of the main part showing how the wiring leads are drawn out in the same coil bobbin, Fig. 6 is a front view of a helical filter of another embodiment, Fig. 7 is a side view of the same, and Fig. 8 is an example of another coil bobbin. FIG. 9 is a perspective view of a main part showing a state in which wiring leads are pulled out from the bobbin. 8...Terminal board, 9...Terminal, 10.
11. 12...Helical element, 13...
...Tsuba, 14...Split bobbin, 15...
・Helical coil, 16...Coupling coil, 17
...Cylindrical body, 1B...Slit, 19
...Protruding piece, 20...Wiring lead, 2
1... Wiring groove, 22... Notch.

Claims (1)

[Scope of utility model registration request] A plurality of helical elements each having a helical coil wound around a split bobbin having a plurality of flanges are arranged on a terminal board, and a wiring lead is hooked onto a protruding piece provided at the periphery of each collar of the split bobbin to position it. A helical filter.