JPH0745984A - Case for noise filter - Google Patents

Abstract

PURPOSE:To provide a case for a noise filter capable of being easily assembled without soldering in the assembly of a case body and a cover when the case for the noise filter consisting of the case body, in which a noise filter circuit is housed, and the cover is built up. CONSTITUTION:A case for a noise filter is constituted in such a manner that notched sections 7 as pawls for caulking are formed to the side faces 8 of a case body, a cover 2, in which rectangular holes 4 are formed to the side faces, is fitted to the case body 1, the notched sections 7 shaped to the case body 1 are engaged in the rectangular holes 4 formed to the cover 2 by inwards bending the notched sections 7, and the case body 1 and the cover 2 are fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a noise filter case which is used in various electronic devices and is intended to prevent electromagnetic noise from penetrating an electronic circuit.

[0002]

2. Description of the Related Art As shown in FIG. 4, a conventional noise filter case is a noise filter case for accommodating a noise filter circuit (not shown) in which an inductor, a capacitor, and a fixed resistor are arranged on a substrate. In order to prevent the noise filter circuit placed inside the case from being affected by electromagnetic noise from the outside, or to prevent the electromagnetic noise generated from the noise filter circuit from radiating to the outside, a copper plate is generally used. Metal case with tin plating or solder plating (noise filter case)
Is used.

As shown in FIG. 4, a metal case (noise filter case) for accommodating these noise filter circuits is composed of a case body 1 and a lid 2 and has terminals 6 of the case body 1. The case body side 8 is provided with a protrusion 5 protruding inward.

When assembling the case body 1 and the lid 2, the lid 2 is locked by the projections 5 arranged on the side surface 8 of the case body and fitted, and then the lid 4 is fixed to the case body 1 and the lid 2. The soldering 3 is applied to the periphery of the joint.

[0005]

In the metal case thus constructed, when the case body 1 and the lid 2 are soldered, the solder flows into the noise filter circuit installed inside the noise filter, As a cause of poor electrical insulation, or adhesion to the edge of the case, or flux used during soldering to adhere to the case, it takes time to remove it and the noise filter itself becomes expensive. Alternatively, a solvent is used to remove the flux, but there is a problem that it cannot be used due to environmental issues.

Therefore, according to the present invention, by processing the case body 1 and the lid 2 in order to eliminate these defects, the case body 1 and the lid 2 are fitted together without soldering 3 to the case body 1 and the lid 2. The purpose of the present invention is to provide a noise filter case in which defective electrical insulation due to solder leakage is eliminated by the joint fixing, and the assembling workability is further improved.

[0007]

A noise filter case according to the present invention comprises a case body made of metal for housing a filter circuit and a lid made of metal, and a case is formed with a notch on the side surface of the case body. After fitting the main body and the lid, it is configured to fix the case main body and the lid by bending and crimping into a rectangular hole provided on the side surface of the lid in advance. It is characterized by being a noise filter case which eliminates electrical insulation defects and is easy to attach the lid and has good workability.

That is, the present invention provides a noise filter in which a noise filter circuit in which an inductor, a capacitor and a fixed resistor are arranged is mounted in a case body and covered with a lid.
A notch is provided on the side of the case body as a caulking claw, and a lid having a rectangular hole on the side of the lid is fitted to the case body, and then the notch provided on the case body is bent inward. A noise filter case characterized in that the case body and the lid are fixed by locking the case body in the rectangular hole provided in the lid.

[0009]

In the past, the metal noise filter case has a structure in which the joint surface between the case body and the lid is soldered to wrap the noise filter circuit, and the electrical insulation failure due to leaked solder or the assembly work takes a long time. The present invention has been made because of the drawbacks such as the need to install the electronic circuit that constitutes the noise filter in the case body, and then the notch formed on the side surface of the case body by fitting the case body and the lid together. With the structure in which the bending lid is fixed to the rectangular hole provided in the lid in advance, the soldering is unnecessary because the assembly is completed.
Therefore, there is no leakage of solder due to the soldering work and no electrical insulation failure occurs. Further, since the soldering work is unnecessary, the assembling work can be improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a noise filter case according to the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of a noise filter case according to the present invention, and FIG. 2 is an enlarged view of a bending portion in which a case body 1 and a lid 2 are fitted to each other.

In the box noise filter case shown in FIG. 1 and the enlarged view of the bending portion shown in FIG. 2, a notch portion 7 is provided on the side surface 8 of the metal case body to be a claw by bending. There is. On the other hand, a rectangular hole 4 is opened in the side surface 9 of the lid 2.

When the lid 2 is fitted and assembled with the case body 1, the lid 2 is fitted inside the opening of the case body 1 and the notch 7 provided on the upper side of the case body side surface 8 is bent inside the case. The case body 1 and the lid 2 are fitted and fixed by caulking in the rectangular hole 4 provided on the side surface 9 of 2.

FIG. 3 is a view showing another example of the notch of the case body according to the present invention. Even if the notch is U-shaped or <-shaped, the same notch is formed by bending the notch 17. You can get the effect.

[0014]

As described above, in the case of the noise filter case according to the present invention, the fitting of the case body for housing the filter circuit and the lid is performed by bending the notch provided in the case body inward and providing the lid with the rectangular shape. The lid and case body are fitted together by caulking in the shape of the hole, so the assembly is easy, and the conventional soldering used when fixing the case body and lid is unnecessary. Become. Therefore, it is possible to provide a noise filter case in which the solder flow to the filter circuit is eliminated, the insulation failure due to the solder can be eliminated, and the assembling work is easy.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a noise filter case according to the present invention.

FIG. 2 is an enlarged perspective view of the bent and crimped portion of the cut portion of the noise filter case according to the present invention with the case body 1 and the lid 2 fitted together.

FIG. 3 is an enlarged perspective view showing another example of the cut shape of the case body according to the present invention.

FIG. 4 is an external perspective view of a conventional noise filter case.

[Explanation of symbols]

 1 Case Main Body 2 Lid 3 Soldering 4 Rectangular Hole 5 Protrusion 6 Terminal 7, 17 Notch 8 Case Body Side 9 Side of Lid 2

Claims (1)

[Claims] 1. A noise filter in which an inductor, a capacitor, and a resistor are arranged in a case body, and an opening of the case body is covered with a lid to form a caulking claw on a side surface of the case body. After fitting the lid with the notched portion and the rectangular hole on the side surface of the lid with the case body, the notched portion provided on the case body is bent inward to form the rectangular hole A case for a noise filter, characterized in that the case body and the lid are fixed by being locked inside.