Metal working – Method of mechanical manufacture – Electrical device making
Patent
1998-12-09
2000-08-15
Arbes, Carl J.
Metal working
Method of mechanical manufacture
Electrical device making
29825, 29828, H01R 4300
Patent
active
061017116
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a method of reducing electromagnetic radiation from an electronic device.
DISCUSSION OF THE BACKGROUND
One conventional form of connection between an electronic device unit and a peripheral of an electronic device is shown in FIG. 4 of the accompanying drawings. FIG. 4 is a schematic perspective view of the conventional electronic device and its connected state. The electronic device has an electronic device unit 41 having a cabinet 41a and a cable connection opening 42, a peripheral 43 having a cabinet 43a, and cables 44.
The electronic device is composed of the electronic device unit 41 and the peripheral 43 which are interconnected by the cables 44. The cables 44 are connected to terminals of the electronic device unit 41 through the opening 42 defined in a lower portion of the cabinet 41a.
The electronic device unit 41, the peripheral 43, and the cables 44 are shielded to prevent electromagnetic radiation generated from internal units of the electronic device unit 41 and the peripheral 43 from affecting the surroundings of the system.
Heretofore, since the number of cables 44 is small and the area of the opening 42 is not large, any effect that electromagnetic noise radiated through the opening 42 has on surroundings is not significant. However, as modern electronic devices have complicated functions, more electromagnetic radiation is generated, the number of cables 44 is increased, and the area of the opening 42 is also increased. Consequently, the intensity of electromagnetic radiation radiated from the opening 42 in the cabinet 41a tends to exceed limit values of various noises.
Attempts have been made to attach a plate or a ventilator as a shield over the opening 42. However, such a plate or a ventilator may not be attached because too many cables are used, or may not provide a sufficient shielding capability.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a method of reducing electromagnetic radiation through an opening for cables for an electronic device and a peripheral with an electromagnetic radiation shield which is capable of effectively shielding electromagnetic radiation easily regardless of the number of cables and which can easily be attached and removed.
According to the present invention, there is provided a method of reducing electromagnetic radiation emitted outwardly from an electronic device including an electronic device unit, a peripheral thereof, and a plurality of cables electrically interconnecting the electronic device unit and the peripheral. According to this method, a cabinet of the electronic device unit, a cabinet of the peripheral, and the cables are shielded, and a soft cloth-like electromagnetic radiation shield is placed in a covering relation to an opening defined in the cabinet to allow the cables to be connected to terminals of the electronic device unit. The electromagnetic radiation shield is attached in an electrically conductive fashion to the cabinet so as to be openable and closable with respect to the opening.
The cloth-like electromagnetic radiation shield preferably has a plurality of vertical slits defined therein for passage of the cables therethrough, with a lower side of the electromagnetic radiation shield being a free end. A plurality of the cloth-like electromagnetic radiation shields may be superposed and attached. The free end of the cloth-like electromagnetic radiation shield, which is divided by the slits, may have a vertical length long enough to wrap the cables near portions thereof which pass through the slits.
The cloth-like electromagnetic radiation shield may be made of electrically conductive fibers, or electrically conductive resin, or electrically conductive rubber.
Since the opening in the cabinet of the electronic device unit is covered by the electromagnetic radiation shield which is soft, cloth-like, and electrically conductive and attached in an electrically conductive fashion to the cabinet, the cables may be passed through the openi
Advantest Corporation
Arbes Carl J.
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