Electricity: conductors and insulators – Conduits – cables or conductors – Preformed panel circuit arrangement
Patent
1993-12-22
1996-02-13
Kincaid, Kristine L.
Electricity: conductors and insulators
Conduits, cables or conductors
Preformed panel circuit arrangement
174260, 174262, 361760, 361761, 361794, H05R 100
Patent
active
054913012
ABSTRACT:
A shielding method which utilizes a three dimensional structure and is effective to a source of the electromagnetic radiation noise, and a circuit board employing the same are obtained. Further, for the purpose of making the shielding function at an enclosure level unnecessary and realizing the recycling of enclosure materials by using this circuit board, in a circuit board structure having at least a signal layer, a power source layer and a ground layer, a signal line on the signal layer which is sandwiched between the two conductor layers made up of the power source layer and the ground layer, or the power source layers or the ground layers, is enclosed in a three dimensional manner with the conductor layers, thereby to form a single or double electrical closed loop current path or paths. By adopting this structure, there is obtained the effect that the electromagnetic radiation noise radiated from the circuit board is greatly reduced. In addition, as a result, there is obtained the effect that since the shielding processing required for the enclosure becomes unnecessary, the enclosure materials can be recycled.
REFERENCES:
patent: 4739448 (1988-04-01), Rowe et al.
patent: 5027253 (1991-06-01), Lauffer et al.
Akiba Yutaka
Hara Tsutomu
Hirota Kazuo
Iida Makoto
Maruyama Takashi
Figlin Cheryl R.
Hitachi , Ltd.
Kincaid Kristine L.
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