JPS58128800A - Electromagnetic field interference preventing method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing electromagnetic interference occurring at a connection between a connector used in an electrical or electronic circuit and an electrical or signal line conductor (cable).

In recent years, electrical and electronic circuits have become smaller and lighter, and circuits have become closer together.As a result, electromagnetic fields are radiated, induced, etc. at the connection points of conductors and connectors that transmit and receive electricity and signals.
Receive electromagnetic interference interference is increasing, presenting a difficult problem in the design of electrical and electronic circuits.

Conventionally, a cable with a shield was used for the conductor connected to the connector, and the connector case and shield were tightened to avoid interference between transmission and reception.
In this case, even if you weld or solder the connection point between the connector and the conductor, the part of the cable with the shield removed will come out and cause interference in the transmitting and receiving electromagnetic fields, causing malfunction. was. To avoid this, the connector case and the electrical and signal line shields are wrapped (taped) and grounded using adhesive-coated conductor tape (thin copper tape). Because of this, gaps may occur during taping, or the tape base and adhesive may separate, resulting in gaps and leakage of electromagnetic fields.Also, when used in the aerospace field, it is necessary to degas the adhesive,
Deterioration of adhesive strength due to thermal factors.

It had many problems, including deterioration of adhesive strength due to cosmic radiation and the weight of the metal tape paste.

Furthermore, the adhesive itself has a weak electromagnetic field shielding ability, and electromagnetic fields often leak from between the adhesive surfaces of the tapes.

This invention solves the drawbacks of the conventional methods.
The connector and electrical and signal line conductor shields are coated with an insulating material to prevent short circuits, and are commonly used in the space and aeronautical fields, etc., with a polymeric compound coating and botting material (filling material). Vacuum evaporation of a conductive metal on the coating layer (sputter song, for example, evaporation of a metal such as aluminum onto a polymer compound such as B8 resin in a vacuum like in aluminum evaporation), and grounding the metal evaporation film. It has the same effect as a conventional shield, and eliminates the leakage caused by gaps or peeling of the adhesive from the tape base, unlike when wrapping metal tape.

The present invention provides an electromagnetic field interference prevention method that prevents received electromagnetic field interference, is lightweight, and is adaptable to any shape.

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

In Figure 9, (1) is the connector case, (2) is the connector insulator,
(3) is the connector pin, (4) is the ground, (5) is the circuit side lead wire, (6) is the electrical and signal line conductive sheath, (7) is the electrical and signal line insulator, and (8) is 'α There is an electrical signal line shield. When transmitting and receiving electrical signals to an N air circuit, a connector is generally used as a medium, and a connector pin is insulated by a connector insulator (2) attached to a connector case (11) made of an electrically conductive metal. The circuit side lead wire (5) and the electrical signal line conductor (6) are connected to (3) to send and receive poisonous air and signals.The connector pin (3) and the electrical and signal line conductor (6) are connected to the connector insulator ( 2) and electrical, signal line insulators (7
) are each insulated? 1. To perform nasal field shielding, the grounding (4) is connected to the connector case (11) and the electrical/signal line shield (8). However, the connector pin (3) and electrical/signal line conduction @ (6
1 requires soldering or welding, so it includes a connector case (1), a connector insulator (2), an electrical and signal line insulator (7), and an electrical and signal line shield (8).
A bare exposed part is generated from the connector, and this exposed part transmits electromagnetic field noise to other electrical circuits, etc., causing malfunctions in the electronic circuits that transmit and receive. Figure 2 shows a conventional connector. and the second electrical and signal line connection
FIG. 3 is a diagram showing a method of shielding an electromagnetic field.

In the figure, (1) is the connector case, (2) is the connector insulator, (3) is the connector pin, (4) is the ground, and (5) is the connector insulator.
) is the circuit side lead wire, (6) is the electrical signal line conductor, (
7) is an electrical and signal line insulator, (8) is an electrical and signal line shield, and (9) is a shield tape. The conventional method of electromagnetic shielding for the exposed parts of the connector pin (3) and the electrical signal line conductor (6) is to shield the exposed part of the electrical signal line conductor (6) with a grounded (4) connector case (1) and an insulated part of the electrical signal line (7). ) or by wrapping (taping) a shielding tape (9) with a copper-based adhesive around the electrical signal line shield (8) that is grounded (4), for example, to connect the ground (4) to the emitted and received electromagnetic field. To prevent interference, connect the connector pin (3) on the connector insulator (2) on the 2-circuit side.
The circuit side lead wire (5) is taken from the terminal and an electrical signal is passed through it. However, in this case, the connector case (11), electrical signal line insulator (7), electrical signal line shield (8)
Shielding tapes, which are made of metal (copper, etc.) as a tape base, have a wide variety of shapes, and it is difficult to tape them flexibly to fit the shape, resulting in deformation gaps. However, gaps caused by the metal's deformation resilience and deterioration of the adhesive cause peeling of the tape base and adhesive, resulting in difficult problems such as electromagnetic interference that passes through these gaps and the adhesive film. .

FIG. 3 is a diagram showing one embodiment of the shield for connecting the connector and electrical signal line of the present invention. In FIG. 9, (1)
is the connector case, (2) is the connector insulator, (3) is the connector pin, (4) is the ground, (5) is the circuit side lead wire, (6) is the electrical signal line conductor, (7) is the electrical signal line The insulator, (8) is an electric signal line shield, aI is a coating of a polymer compound, a filler (botting material), and an is a metal vapor deposition film (sputtering). This invention prevents a shield gap between the connector bin (3) and the electrical signal line (6).
), and the electrical signal line insulation (7) or optionally the electrical signal line shield (8), are coated with a potting ring and then vacuum metal deposition (such as aluminum deposition), commonly referred to as sputtering, is applied over this coating. For example, metal such as aluminum is evaporated onto a polymer compound such as MuBS resin in a vacuum.
4), as a result, sputtering forms a complete adhesive film regardless of the shape, so shielding against electromagnetic fields is sufficient, preventing leakage of electromagnetic fields, and preventing peeling. ) and electrical signal line conductor (6
) is also covered and filled with a botting material, so it has sufficient strength without causing electrical signal line breakage, etc., even for electronic circuits attached to the moving mechanism.

Thus, the present invention can prevent electromagnetic field interference in the connection between the connector and the electrical signal line by applying a metal vapor deposition shield.

[Brief explanation of the drawing]

Figure 1 shows the first example of conventional connectors and electrical and signal line connections.
2 is a diagram showing a second example of a shielding method for connecting a conventional connector and an electrical signal line, and FIG. 3 is a diagram showing an example of a shielding method for connecting a connector and an electrical signal line according to the present invention. FIG. In the figure, (1) is the connector case, and (2) is the connector insulator. (3) is the connector bin, (4) is the ground, (5) is the circuit side conductor, (6) is the electrical, signal line conductor, (7) is the electrical signal line insulator, (8) is the electrical signal line shield. (9) is shield tape, (11 is coating, filler (botting), at+ is metal vapor deposition film (sputtering)
It is. In addition, the same reference numerals are used for the same or corresponding parts in the figures.)
It is attached. Agent Makoto Kuzuno - Question 1 Question *Z Hakuho 3 θ

Claims (1)

[Claims] Covering the connector and electrical/signal lines with an insulating material, coating the coating with a metal vapor-deposited electrical conductor, and grounding the electrical/signal line and other connectors connected to the above connector. 1. A method for preventing electromagnetic field interference, characterized by preventing electromagnetic field interference between electricity, signal lines, or electric circuits connected to.