Electronic circuit apparatus for suppressing electromagnetic radiation
First Claim
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1. An electronic circuit apparatus for suppressing electromagnetic radiation comprising:
- an electronic circuit mounted on a top surface of a printed-circuit board;
an input-output terminal mounted on said printed-circuit board;
a shield-case for suppressing electromagnetic radiation from said electronic circuit;
a conductor-piece, allocated between said electronic circuit and said input-output terminal and, connecting a first ground-pattern stuck to a bottom surface of said printed-circuit with said shield-case;
means for connecting said first ground-pattern with said input-output terminal via said conductor-piece;
wherein said connecting means is composed of a second ground-pattern stuck to said bottom surface of said printed-circuit board near said input-output terminal and a metallic-connecting-piece for connecting said second ground-pattern with said shield-case.
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Abstract
It is the object of the invention to suppress electromagnetic radiation caused by the ground potential of a printed-circuit board, which now becomes an important problem, as the bit-rate of digital signals increases. The ground-pattern of an electronic circuit mounted on the printed-circuit board is connected to the shield-case of an electronic circuit apparatus via a conductor-piece, noise generated by the electronic circuit is by-passed, and electromagnetic radiation of noise from a cable connected to the printed-circuit board via a connector can be suppressed.
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Citations
6 Claims
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1. An electronic circuit apparatus for suppressing electromagnetic radiation comprising:
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an electronic circuit mounted on a top surface of a printed-circuit board; an input-output terminal mounted on said printed-circuit board; a shield-case for suppressing electromagnetic radiation from said electronic circuit; a conductor-piece, allocated between said electronic circuit and said input-output terminal and, connecting a first ground-pattern stuck to a bottom surface of said printed-circuit with said shield-case; means for connecting said first ground-pattern with said input-output terminal via said conductor-piece; wherein said connecting means is composed of a second ground-pattern stuck to said bottom surface of said printed-circuit board near said input-output terminal and a metallic-connecting-piece for connecting said second ground-pattern with said shield-case. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification