JPS6334347Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a noise filter suitable for use as a power line filter or the like.

FIGS. 1 and 2 show an example of a conventional noise filter of this type. In these figures, insulating resin terminal plates 4 having grooves 3 that fit into the notches 2 are fitted into the notches 2 on both sides of the metal case 1, and metal terminals 5 are fitted into the terminal plates 4. is fixed. A common mode choke coil 6 and a capacitor 7 are housed inside the metal case 1, and predetermined wiring and connections are made. A back cover 10 integrally having a mounting portion 9 in which a mounting hole 8 is formed is attached to the opening of the metal case 1.

By the way, in the conventional structure as described above, it is necessary to provide the notch 2 in the part of the metal case 1 where the terminal plate 4 is placed, and therefore the mounting part 9 must be provided in the back cover 10. , it is not possible to adopt a structure in which the back cover 10 is omitted. For this reason, there is a drawback that the number of parts increases and the assembly work becomes troublesome. Further, there are cases where it is desired to provide the metal case 1 insulated from the chassis of the attached equipment, but in such a case, an insulating bushing or the like must be prepared separately.

In view of the above points, the present invention provides an L-shaped structure for the insulating resin terminal plate that is fitted into the metal case with an integral mounting part, thereby making it possible to omit the back cover and reducing the number of parts. Another object of the present invention is to provide a noise filter that can be easily assembled and installed with a metal case insulated from the equipment on which it is installed.

Embodiments of the noise filter according to the present invention will be described below with reference to the drawings.

FIG. 3 shows a first embodiment of the present invention. In this figure, resin terminal plates 4A are provided in the notches 2 on both sides of the metal case 1, and are bent into an L-shape so as to integrally have a mounting portion 9A. That is, as shown in FIG. 4, grooves 3 that fit into the notches 2 are formed on both end surfaces of the terminal plate 4A, and the terminal plate 4A is fixed in the metal case 1 in a fitted state. A mounting hole 8A is formed in the mounting portion 9A of such a terminal board 4A. A common mode choke coil 6, a capacitor 7, etc. are housed in the metal case 1, and after predetermined wiring is connected to the metal terminals 5, etc., the inside of the case is molded with an insulating resin 20.

According to the first embodiment, the insulating resin terminal plate 4
Since A is bent into an L-shape and integrally has the mounting portion 9A, the mounting portion 9A can be used to fix the device to the chassis of the device to be mounted. For this reason, the back cover of the conventional case is unnecessary,
The number of parts can be reduced and the number of assembly steps can also be reduced. Further, since the metal case 1 can be electrically insulated from the chassis of the other device, this may be particularly advantageous depending on the installation location.

FIG. 5 shows a second embodiment of the invention. In this case, the metal case 1B has the notch 2 formed only on one side, and the metal case 1B has a mounting part 9B integrally formed with the mounting hole 8B on the other side. Then, the insulating resin terminal plate 4B is fitted into the notch 2. The terminal plate 4B in this case is bent into an L-shape like the terminal plate 4A in the first embodiment, and has the mounting hole 8.
Although it has an integral mounting portion 9C formed with C, as many metal terminals 5 as necessary are provided. Note that the other structures are the same as those of the first embodiment described above.

According to the second embodiment, since the mounting portion 9B is integrally provided on one side of the metal case 1B, it is suitable for applications where it is desired to actively ground the metal case 1B.

In the above embodiment, a terminal plate having thin plate-like metal terminals is shown, but a lead wire terminal, a tab terminal, a screw terminal, or the like may be provided on the terminal plate.

As explained above, according to the present invention, the number of parts can be reduced and assembly can be simplified by using an L-shaped terminal plate that has a mounting part integrally formed with an insulating resin terminal plate that is fitted into a metal case. A simplified noise filter can be obtained.

[Brief explanation of drawings]

FIG. 1 is a plan sectional view showing a conventional noise filter, FIG. 2 is a side view thereof, FIG. 3 is a side sectional view showing a first embodiment of the noise filter according to the present invention, and FIG.
The figure is a plan sectional view showing a terminal plate portion, and FIG. 5 is a side sectional view showing a second embodiment of the present invention. 1, 1B...Metal case, 2...Notch, 3...
... Groove, 4, 4A, 4B ... Insulating resin terminal board, 5
...Metal terminal, 6...Common mode choke coil, 7...Capacitor, 8, 8A, 8B...Mounting hole, 9, 9A, 9B, 9C...Mounting part, 20...
Insulating resin.

Claims (1)

[Scope of utility model registration request] An L-shaped insulating resin terminal plate having grooves on both end faces that fit into the notches of the metal case, integrally having a mounting part with a mounting hole formed therein, and provided with a terminal is provided as described above. A noise filter that is fitted into a notch.