JPH0218589Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to the structure of a noise filter in which parts such as a capacitor and a chiyoke coil are housed in a metal container consisting of a container body and a lid.

[Conventional technology]

The container body used in this type of noise filter is provided with a plurality of external lead-out terminals that penetrate the side wall and are electrically insulated from the container body, and are provided inside at a depth slightly below the opening edge. A plurality of protrusions are formed toward the surface. Further, the lid body is a tray-shaped metal plate that fits into the opening. These are assembled as follows. That is, the circuit components are housed in the container body, the lead wires are connected to the inside of the external lead terminal, and some of the lead wires of the capacitor are connected to the inside of the container body by soldering. Then, the lid is fitted into the opening of the container body so that its edge comes into contact with the protrusion of the container body, and the entire boundary between the periphery of the opening and the edge of the lid is soldered to create a noise filter. It will be done.

[Problem that the invention attempts to solve]

Conventional noise filters require a long time to work on because the solder joint between the container body and the lid is long, and the entire body is heated and solder flows into the container body, or the lead wire of the capacitor connected to the container body is heated. There was a risk of the soldering coming off, which caused a quality problem.

An object of the present invention is to provide a noise filter that eliminates the above-mentioned problems.

[Means for solving problems]

In this device, a plurality of electrically insulated external lead-out terminals are passed through the side wall of the container body, which has an open top or bottom, and lid holding claws are formed on a pair of opposing edges of the opening. A box-shaped metal container body, a metal lid body having a recessed part on both edges that engages with the lid holding claw, and a recessed part having a through hole in the center part for closing the opening of the container body. This is a noise filter.

[Effect]

This noise filter houses the circuit components inside the container body, connects these lead wires to the inside of the external lead terminal, and attaches the lid by matching the lid holding claw and the recessed part, and Pull the capacitor lead wire outward through the through-hole in the concave part of the lid body, close the opening, bend the lid holding claw and bring it into contact with the concave step to lock the lid body, and then insert the capacitor lead wire into the lid body. The connection can be made by soldering inside the recess on the outside of the recess.

〔Example〕

This invention will be explained in detail below based on the drawings.

FIG. 1 is an exploded perspective view of one embodiment of this invention.

In the figure, 1 is a box-shaped metal container with an open bottom, 2 is a metal lid, 3 is a terminal plate assembly, 4 is a chain coil (the winding is not shown), and 5 and 6 are capacitors.

The metal container 1 has a rectangular notch 11 (only one is shown) formed at the opening edge of one opposing side wall, and cuts are made at the opening edge of the other opposing side wall, and a lid is attached at two places on each side. A presser claw 12 is formed.

The lid 2 is a rectangular metal plate that closes the opening of the container 1.
Both end edges of the container 1 corresponding to the notch 11 are extended to form extensions 21. A mounting hole 22 is formed in the center of the extension portion 21 . Lid body 2
A recessed step portion 23 is formed on each of the other two edges. This recessed step part 23 is made by bending, drawing, etc., and is formed in such a size that it can be hung with the lid holding claw 12 bent at right angles when the opening of the container 1 is closed with the lid 2. ing. moreover,
A recess 24 is formed in the center of the lid 2, and a through hole 25 is formed in the upper end surface of the recess 24.

The terminal plate assembly 3 is a rectangular frame integrally formed with two terminal plates 31 made of an insulating material and two square insulating rods 34. The terminal plate 31 has a rectangular shape that is slightly larger than the notch 11 of the container 1, and grooves 32 that fit into the edges of the notch 11 are formed on three of the top, bottom, left, and right side edges except for one. There is. The terminal plate 31 also has two disc-shaped protrusions 33 formed on its outer surface. Further, on the terminal plate 31, lead-out terminals 7a and 7b having an external connection part 71 and an internal connection part 72 are attached to the protrusion 33.
It is buried integrally through the center of the The square bar 34 has a relay terminal 8 planted in the center,
It is connected to the terminal plate 31 at both ends thereof. Furthermore, internal connecting portions 72 of the terminals 7a and 7b extend to both ends of each square bar 34 for connection.

The chiyoke coil 4 and the capacitors 5 and 6 are arranged within the framework of the terminal plate 31 and the square bar 34, and these lead wires are connected to the internal connection part 72 of each terminal and the relay terminal 8 to form the required filter circuit. Configure. In addition, the lead wire (not shown) to be connected to the ground end should be directed downward of the frame. The container 1 is placed over the terminal board assembly 3 with the circuit components assembled in this way, and the notch 11 is inserted into the groove 3 of the terminal board 31.
Fit it in. Next, the container 1 is turned upside down, the lid 2 is also turned upside down, and the bottom opening of the container 1 is closed with the lid 2 while the grounding lead wire is inserted into the through hole 25 of the recess 24. Then, as shown in FIG. 2, the lid 2 is latched by bending the lid holding pawl 12 inward and abutting the recessed step 23. Finally, connect the grounding lead wire to the lid 2 by soldering inside the recess 24, and solder the joint between the inner wall of the container body 1 between the lid holding claws 12 and the recessed step 23, and install the noise filter. is completed.

[Effect of idea]

As mentioned above, according to this invention, soldering between the container body and the lid is done only on a part of the recessed part, so the work time is short and the whole body does not get hot, and the solder does not enter the container. live in Furthermore, since the soldering between the capacitor lead wire and the container is performed outside the container, the work is easy, and the connection can be made reliably, resulting in a highly reliable product. Furthermore, the concave stepped portion provided on the lid body has the effect of positioning the lid body with respect to the container body by coming into contact with the inner wall surface of the container body.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of one embodiment of this invention, and FIG. 2 shows the appearance of the embodiment of FIG. 1 after assembly, upside down. In the figure, 1: metal container body, 2: metal lid, 3:
Terminal board assembly, 4: Chi York coil, 5, 6:
Capacitor, 7a, 7b: External lead-out terminal, 8:
Relay terminal, 31: Terminal board, 34: Insulating square rod.

Claims (1)

[Scope of utility model registration request] In a noise filter in which a chiyoke coil and a capacitor are housed in a metal container, the metal container consists of a box-shaped container body with an open bottom or top and a lid, and the container body has a pair of opposite edges of the opening. A lid holding claw is formed by cutting a slit in the container body, and a recessed step portion is formed on both edges of the container body corresponding to the lid holding claw, and the recessed step portion is in contact with the side wall of the container body over almost the entire length; A recessed portion having a through hole is formed in the center of the lid body, and the opening of the container body is closed by the lid body by matching the lid holding claw with the recessed step portion, and the lid holding claw is bent to form the recessed stepped portion. A structure of a noise filter characterized in that the lead wire of the capacitor is passed through the through hole of the recess and the lead wire is soldered into the recess from the outside of the lid.