JPS60140914A - Noise filter - Google Patents

Abstract

PURPOSE:To improve the workability and cost-down by connecting leads of an inductance element and a capacitor element to an aluminum case, mounting each element to a printed board having conductor pattern and connecting the ground part of the conductor pattern and the case with a conductive adhesives. CONSTITUTION:The lead 23 of the inductance element 19 and the lead 24 of the capacitor element 22 are inserted to a mounting hole 27 of the printed board 26 having the conductor pattern 25 to the upper face. Several semi-circle notches 29 are provided at an outer circumferential part of the printed board 26 and after they are soldered, the outer lead 28 is folded, inserted to the notch 29 and led upward. The inductance element 19 and the capacitor element 22 mounted on the printed board 26 are contained in the case 16 with a packing material in this way and the ground part 25a of the conductor pattern 25 of the printed board 26 supported by the upper end of an insulation layer 18 and the case 16 are connected by the conductive adhesives.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a noise filter used to prevent malfunctions caused by noise in digital equipment such as office equipment, measuring equipment, and machine tools.

Conventional configuration and its problems Generally, a noise filter is used as shown in FIG. That is, a noise filter 6 composed of an inductance element 3 and a capacitor element 4 is connected between the power supply 1 and the load 2 to cut noise from noise sources 6 and 7 that are considered to be connected to the power supply 1. It is. Note that the noise source 6 is noise generated between lines,
Noise source 7 shows the noise occurring between the line and ground.

Traditionally, the second type of noise filter used in this way is
It was configured as shown in the figure.

In other words, an inductance element 1o in which a conducting wire 9 is wound around a ring-shaped magnetic core 8, and several capacitor elements 11 are connected to several external lead wires 12, and an insulating layer 1 is inserted inside the inductance element 1o.
3, the ground terminal 16 of the capacitor element 11 was connected to the case 14 using aluminum solder, and a filler was injected into the case 14.

In such a configuration, the inductance element 10.
The connection between the capacitor element 11 and the external lead wire 12 has to be made in the air without any support, resulting in poor workability. This soldering work was extremely difficult because it required the use of aluminum solder, which has a higher melting point than aluminum solder.

OBJECTS OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned conventional drawbacks, and to provide a noise filter that is easy to assemble and can be easily connected.

Structure of the Invention In order to achieve the above object, the lead wires of an inductance element and a capacitor element are connected to an aluminum case having an insulating layer provided on the inner surface except for the upper end, and are fitted into a notch on the periphery. A printed circuit board having a conductive pattern connected to an external lead wire is assembled together with each of the above elements, a filler is filled in the case, and the ground part of the conductive pattern of the printed circuit board and the case are connected with a conductive adhesive. With this configuration, the lead wires of each element and the external lead wires can be easily connected to the printed circuit board by inserting them from the same direction and using dip soldering, and the grounding part of the printed circuit board and the case can also be connected using conductive adhesive. This can be done easily and reliably using a chemical agent.

Description of examples Hereinafter, an embodiment of the present invention will be explained using FIG. 3 of the drawings.

A case 16 is made of aluminum and has a cylindrical shape with an open top and a bottom, and a mounting rod 17 is provided at the bottom so as to protrude outward.

Further, an insulating layer 18 is provided on the inner surface of the case 16 except for the upper end portion. This insulating layer 18 may be formed as an insulating case.

19 is an inductance element constructed by winding a conducting wire 21 around a ring-shaped magnetic core 2o, 22 is a capacitor element, and lead wires 23 . The lead wire 24 of the capacitor element 22 is inserted into a mounting hole 27 of a printed circuit board 26 having a conductive pattern 26 on its upper surface. Also, one end of the external lead wire 28 is connected to the printed circuit board 28.
These are connected to the conductive pattern 255 base by dip soldering. Several semicircular notches 29 are provided on the outer periphery of the printed circuit board 26. After soldering, the external lead wires 28 are bent as shown by broken lines, fitted into the notches 29, and pushed upward. be drawn out.

The inductance element 19 incorporated into the printed circuit board 26 in this manner. The capacitor element 22 is housed in the case 16 together with a filler, and the case 16 is connected to the ground portion 25a of the conductive pattern 25 of the printed circuit board 26 supported by the upper end of the insulating layer 18 using a conductive adhesive.

Effects of the Invention As described above, the noise filter of the present invention uses a printed circuit board to connect the inductance element, capacitor element, and external lead wire, so they can all be assembled from the same direction and connected by dip soldering, which improves the workability of assembly. The process is progressing significantly. In addition, the distance between the lead wires of each element can be maintained constant, increasing reliability in terms of insulation, and the electrical connection between the ground part of the printed circuit board and the case can be easily and reliably made using conductive adhesive. However, the workability was improved by 6 pesos, and as a result, an inexpensive noise filter could be provided, which is of great industrial value.

[Brief explanation of the drawing]

Fig. 1 is an electrical circuit diagram showing an example of the use of a general noise filter, Fig. 2 is an exploded perspective view of a conventional noise filter,
FIG. 3 is an exploded perspective view showing one embodiment of the noise filter of the present invention. 16... Case, 18... Insulating layer, 1
9... Inductance element, 22...
Capacitor element, 23.24...Lead wire, 2
5... Conductive pattern, 26... Printed circuit board, 27... Mounting hole, 28... External lead wire, 29... Notch . Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure 2. ．． 529 26 1 town 1 town 27 J: N';)q 71 10 2Q, Near? Zo 2' 4 422 3? 3 Hi1q 21 yl/ ζ1. t

Claims (1)

[Claims] Inside the aluminum case, which has an insulating layer on the inner surface except for the top edge, there is a conductive pattern that connects the lead wires of the inductance element and capacitor element, as well as the external lead wire that is fitted into the notch on the periphery. A noise filter in which a printed circuit board is assembled together with each of the above elements, the case is filled with a filler, and the ground part of the conductive pattern of the printed circuit board and the case are connected with a conductive adhesive.