JPS63261906A - Noise elimination filter - Google Patents

Abstract

PURPOSE:To contrive the improvement of the mess-productivity of high performance noise elimination filters by burying a terminal pin and a capacitor respectively to a guard at both ends of a coaxial bobbin and a central guard and winding a coil to a winding groove. CONSTITUTION:Terminals 8, 9 are buried respectively to the guards 7a, 7c at both ends of the coaxial bobbin and a capacitor 11 is imbedded in the central guard 7b, a coil is formed by winding windings 13, 14 respectively to winding grooves 7d, 7e between the guards and the noise elimination filter is formed by applying T or pi shape connection to the coil and the capacitor 11. The diameter of the bobbin and the distance between plural inductances are selected to select a sufficiently small value such as 0.1 or below for the electromagnetic coupling coefficient, then a wide attenuation characteristic is realized and the Q of the inductance of the coil is increased to obtain a flat pass band. Thus, the high performance noise eliminating filters are formed with high mass- productivity.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a noise removal filter for reducing electromagnetic wave interference from electrical and electronic equipment.

Conventional technology Conventionally, as a signal system noise filter for electrical and electronic equipment,
A bead core or a capacitor alone is used, or a bead core 1 and a capacitor 2 as shown in FIG. 6, and an inductance 5 and a capacitor 6 formed by winding 4 around a ferrite core 3 as shown in FIG. 6 are used. Bead core 1.
Although a filter using the capacitor 2 or a combination thereof is inexpensive, it has a low ability to remove noise caused by higher performance and digitalization of equipment, which is a bottleneck in equipment design.

In addition, the combination type of inductance 5 and capacitor 6 shown in Fig. 6 has high noise removal ability, but since the ferrite core 3 is used for the inductance 6, the cost is high and each inductance 5 is a discrete component. Therefore, continuous winding was not possible and mass productivity was poor.

Problems to be Solved by the Invention In conventionally used noise removal filters that have a structure of bead capacitors and a combination of both, the frequency-attenuation characteristics within the pass band are not flat and the degree of distortion to the transmitted waveform is high. big. Furthermore, in the attenuation region, the attenuation occurs only in a trap-like manner, and therefore a wide area cannot be covered. Since noise generally exists over a wide frequency range, conventional filters have not been able to satisfy the required characteristics.

Means for solving the problems and technical means of the present invention for solving the above problems are to insert a capacitor into a coaxial bobbin, use one of its lead wires as a relay terminal, and wind the capacitor continuously in the bobbin winding groove. It has a configuration in which the lines are aligned.

action The effect of this technical means is as follows.

That is, in order for the noise removal filter to have a sufficient noise removal effect, it is necessary to sufficiently reduce the electromagnetic coupling between the inductances. Therefore, in the present invention, the diameter of the bobbin winding portion and the distance between the plurality of inductances are optimally designed to make the electromagnetic coupling coefficient K 0.1 or less, thereby realizing a wide damping characteristic. Further, by configuring a wire-wound inductance, a high Q can be obtained, and a noise removal filter with a flat pass band can be realized. Furthermore, since multiple inductances can be continuously wound, mass productivity is greatly improved.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings.

In FIG. 1, 7 has a plurality of flanges 7a to 7C, and these flanges form a plurality of winding grooves 7d formed by 7λ to 7c.
, 715, terminals 8.9 are provided on both sides of the flanges a and 7c, and the capacitor 11 is inserted into the capacitor insertion hole 1o formed in the center flanges 7b. One end of the wire 111L passes through the through hole 12 and projects upward.

The winding is terminal 81 winding 13. Upper lead wire 11a1 winding 14 of capacitor 11. Do this in order of terminal 9.

Next, the operation of the configuration of the embodiment will be explained. First, a copper wire is wound around the terminal 8, and then the winding 13 is wound around the winding groove 7d and then around the lead wire 111L of the capacitor 11 to serve as a relay point. Further, the winding 14 is continuously wound in the remaining V winding groove 7e and wound around the terminal 9 to complete the winding work. In this way, multiple inductances can be created without interrupting the winding operation.

Furthermore, if attention is paid to the individual inductances, it is possible to obtain a higher Q than the conventional bead-type inductance as shown in FIG. 5, and to keep the passband flat as shown by the solid line in FIG. Note that the broken line in FIG. 2 is the passband of the conventional noise removal filter shown in FIG. 5.

Next, other embodiments of the present invention will be described.

FIG. 3 shows another embodiment, in which the collars 7a, 7b, 7b', 7c of the coaxial bobbin 7, the winding conductors d, 78.7f, and the capacitor insertion hole 10a
, 10b1fr: The number of elements is increased by increasing the number of elements, and this is effective when the passband and the region in which noise is to be attenuated are close to each other.

Even in this case, the winding can start from terminal 8, winding 13, winding around lead wire 111L of capacitor 11, which is a relay terminal, and winding continuously up to terminal 9, so mass productivity will not decrease. .

Next, another embodiment of the present invention will be described.

FIGS. 4a and 4b show another embodiment, in which a plurality of noise removal filters 15 shown in FIG. It is something. When the quantity used is large or the mounting density is high, it is advantageous in terms of insertion cost and printed circuit board area, and υ productivity increases.

Furthermore, it is possible not only to block only the noise removal filter shown in FIG. 1, but also to form blocks of noise removal filters with an increased number of elements as shown in FIG. 3, or a combination of both.

Effects of the Invention As described above, the present invention allows a capacitor to be inserted into the capacitor insertion hole in the collar at the center of the coaxial bobbin, and the lead on one side of the capacitor is used as a relay terminal to continuously wind the wire, thereby achieving high productivity without reducing mass productivity. It provides a high performance noise removal filter.

[Brief explanation of the drawing]

FIG. 1 is a half-sectional front view showing the structure of a noise removal filter according to an embodiment of the present invention, FIG. 2 is a characteristic diagram of the same noise removal filter and a conventional noise removal filter, and FIG. A sectional view showing the structure of the embodiment, FIGS. 4s and 4b are a top view and a plan view showing the structure of another embodiment of the present invention,
6 are a half-sectional front view and a sectional view showing the structure of a conventional noise removal filter. 7...Coaxial pobbin, 7&~7C...Brim, 7d. 7e...Winding groove, 8.9...Terminal, 1
0...Capacitor insertion hole, 11...Capacitor, 114...Lead wire, 13.14.
...Winding. Name of agent: Patent attorney Toshio Nakao and 1 other person 1st
Figure capacitor Figure 2 Figure 2, Yayu M Ren drinking (bar... Figure Figure 3 Figure 4/S

Claims (5)

[Claims] (1) Equipped with a coaxial bobbin that has multiple flanges and multiple winding grooves formed by these flanges, terminal pins are embedded in the flanges at both ends of this coaxial bobbin, and a capacitor insertion hole is provided in the flanges in the center. , a noise removal filter in which a coil is wound around each winding groove, a capacitor is attached to the brim at the center, and the coil and capacitor are connected in a T-shape or a π-shape. (2) The noise removal filter according to claim 1, wherein the thickness of the center brim in the coaxial direction is set to a coupling coefficient of 0.1 or less between the coils on both sides. (3) The noise removal filter according to claim 1, wherein two or more protrusions are formed on the upper surface of the central brim. (4) The noise removal filter according to claim 1, which is formed by connecting a plurality of noise removal filters in the axial direction. (5) The noise removal filter block according to claim 1, having a structure in which a plurality of noise removal filters are arranged horizontally.