Electricity: electrical systems and devices – Miscellaneous
Patent
1990-06-22
1991-08-20
Picard, Leo P.
Electricity: electrical systems and devices
Miscellaneous
361399, H05K 900
Patent
active
050419455
ABSTRACT:
The present invention provides an electromagnetic wave shield type circuit unit including a circuit substrate and an electromagnetic wave shield casing, the circuit substrate being fixedly mounted in the shield casing through mounting members such that the electromagnetic waves can be prevented from leaking externally out of the circuit unit. The circuit unit is provided, at each side, with a terminal region having a plurality of externally connecting terminals, a circuit region on which various circuits are mounted and a mounting region between the terminal and circuit regions. The mounting members include a pair of shield plates each having at least one strip-like portion fixedly mounted on the circuit substrate across the width thereof in the corresponding mounting region. These shield plates sandwich the circuit substrate from its opposite sides such that the circuit substrate is fixedly received within the electromagnetic wave shield casing with the terminal regions thereof exposed externally. Even if the terminal regions of the circuit substrate are externally exposed out of the shield casing, the external leakage of electromagnetic waves from the shield casing can be reduced greatly.
REFERENCES:
patent: 3668476 (1972-06-01), Wrabel et al.
patent: 4149027 (1979-04-01), Asher et al.
patent: 4628412 (1986-12-01), Nigorikawa
Namco Ltd.
Picard Leo P.
Sparks Donald A.
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