JPH02295199A - Noise prevention device and its manufacturing method - Google Patents

Abstract

PURPOSE:To obtain a noise prevention device which can be mounted at any position of electrical wire and eliminate the generation of noise by installing a pressure connection groove having a pressure connection blade and an electric wire clamping section to a noise prevention device main body made of a synthetic resin material so that they may face each other and installing a stopper clip in a projecting manner and a chip capacitor between conductors. CONSTITUTION:In a portion equivalent to a section of a standing wave in an automobile electric wiring D, the electric wire D is adapted to be positioned in a pressure connection groove and on an electric wire clamping section 8 so that a lock stopper 10 may be engaged with a joint section 11 by closing a cover A2. The closing motion of the cover A2 forces a projected part 12 to press the electric wire so that it may be pushed into the pressure connection groove 3. During this operation, pressure connection blades 3a cut off a covering D1, and comes into contact with a conductor D2 as well. A series of conductive sections B are formed by plating on the pressure connection blades 3a so that the conductor D2 may be communicated with the conductive sections B. Under this state, a noise prevention device main body A is mounted by inserting its stopper clip 6 into the hole of a chassis, which grounds the conductor D2 with the chassis by way of the conductive section B formed on the surface of the stopper clip 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a noise prevention device and the like for preventing noise radio waves from a noise source from being radiated through the electrical wiring, mainly in the electrical wiring for automobiles. This relates to a manufacturing method.

(Prior Art) For example, in automobiles, conduction noise from noise sources with high frequency components such as horns and wiper controls, external noise from neon signs, and induction noise are carried on electric wires and are transmitted to radios and EFIC CPUs. , causing malfunctions and other problems to various sensors. Conventionally, as a countermeasure against this problem, if the source of the noise is known, a noise filter is attached to the source of the noise, or a noise filter is attached to the victim equipment, but this method has not been sufficiently effective.

[Problems to be Solved by the Invention] The present invention can be easily attached to the electrical wiring connected to the noise generation source or the victim equipment even if a noise filter is not provided in the noise source or the victim equipment. A standing wave of current is generated on the wire due to the impedance mismatch between the wire and the load, and focusing on the fact that a great effect was obtained by attaching a noise filter to this node, we decided to apply a noise filter to any node of the standing wave. In addition, it can be easily manufactured.

[Means for Solving the Problems] In order to solve the above-mentioned problems, in the present invention, a pressure contact groove having a pressure contact blade and a wire clamping portion are provided in correspondence with each other in a noise prevention device body made of a synthetic resin material, and are locked. It is characterized by having a protruding clip, integrally provided with a conductor portion formed by plating means extending from the pressure welding blade to the locking clip, and interposing a chip capacitor between the conductor portions. As a manufacturing method, a noise prevention device main body having a pressure contact groove having a pressure contact blade, a wire clamping portion, and a locking clip is formed from a synthetic resin material, and a chip capacitor is positioned between the pressure contact groove and the locking clip. It is characterized in that a conductor portion is integrally provided while being connected to the chip capacitor by plating the chip capacitor.

〔Example〕

In FIG. 1, A is a main body of the noise prevention device, which consists of a housing case A and a cover A2. The storage case A and the cover A2 are made of an insulating material such as nylon or polypropylene, and are constructed so that they can be opened and closed by an integral hinge part 1. Inside the housing case A+, a plurality of conductor portions B are integrally arranged in parallel by means such as plating.

At one end of the conductor portion B, a pressure contact groove 3 for the electric wire is provided by an upright wall 2, and pressure contact blades 3a, 3a are opposed to each other in the pressure contact groove 3.

A recess 4 for positioning the chip capacitor 〇 is formed in the middle portion of the conductor portion B.

The other end of the conductor portion B extends to the back surface of the storage case A+ through the through hole 5, and reaches the surface of a locking clip 6 provided on the back surface of the storage case A, hanging downward.

Note that 7 is an elastic piece for stabilizing the installation.

In the opposing peripheral walls 1a of the housing case 1, the conductor portion B
A semicircular groove-shaped electric wire clamping part 8 is formed to correspond to the extending direction of the electric wire clamping part 8, and a semicircular groove-shaped electric wire clamping part 9 is also formed in the cover A2 corresponding to the electric wire clamping part 8.

A locking piece 10 is provided on the cover A2, and the housing case A. The cover A2 is provided with an electric wire pressing protrusion 12 facing the plurality of press grooves 3.

The conductor portion B is formed by the 2-SHOT method. That is,
The noise prevention device main body A is molded in the first stage using a synthetic resin material in which a catalyst such as palladium is dispersed, and in the second stage, the conductor part is molded using a synthetic resin material that does not contain a catalyst. Then, the surface of the molded product is roughened using chromic acid and sulfuric acid, and electroless plating is applied to form the conductor part B. At the time of electroless plating, the chip capacitor C is housed in the positioning recess 4 in advance, and the electrode portion is plated by electroless plating to be fixed at the same time as circuit connection.

In the above configuration, when in use, the electric wire D
is positioned on the pressure welding groove 3 and the wire holding portion 8, and the cover A2 is closed to engage the locking piece 10 with the engaging portion 11. The closing operation of the cover A2 causes the protrusion l2 to hold the wire D. Press and press fit into the pressure welding groove 3, and at this time press contact blades 3a,
3a cuts the sheath D of the electric wire and comes into contact with the conductor D2. A series of conductor portions B are formed on the pressure contact blades 3a, 3a by plating, so that the conductor D2 is electrically connected to the conductor portion B.

In this state, the noise prevention device main body A is attached by fitting the locking clip 6 into a hole (not shown) in the vehicle body, and the noise preventer body A is attached via the conductor portion B formed on the surface of the locking clip 6. and ground conductor D2 to the vehicle body.

〔Effect of the invention〕

Since the present invention is constructed as described above, it can be simply attached to any position on the electric wire to eliminate noise, and the chip capacitor can be connected to the conductor part at the same time as the conductor part is formed by plating. , easy to manufacture.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an embodiment of the present invention, with the cover partially cut away, with the cover open; Fig. 2 is a sectional view with the same cover closed; and Fig. 3 shows an electric wire being held between the wires. Fig. 4 is a perspective view of the noise prevention device fixed to the wire, and Fig. 5 is an enlarged view of the main parts showing the connection between the wire and the conductor. . A... Noise prevention tool body, B... Conductor part, C...
Chip capacitor, D...Electric wire, 3...Pressure groove,
3a... pressure contact blade, 6... locking clip. Figure 2

Claims (2)

[Claims] (1) A pressure contact groove having a pressure contact blade and a wire holding portion are provided in correspondence with the noise prevention device body made of a synthetic resin material, and a locking clip is provided protrudingly, and plating extends from the pressure contact blade to the locking clip. 1. A noise prevention device comprising integrally provided conductor portions and a chip capacitor interposed between the conductor portions. (2) A noise prevention device main body is formed from a synthetic resin material, and includes a pressure groove having a pressure contact blade, a wire holding portion, and a locking clip, and a chip capacitor is positioned between the pressure groove and the locking clip. A method for manufacturing a noise prevention device, which comprises integrally providing a conductor part while plating the chip capacitor and connecting it to the chip capacitor.