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US 5,493,473 AGranted
Case for shielding electronic circuit members from electromagnetic waves
AssigneeNEC Corporation
InventorNobuyuki Yanagi
Life of this patent
Estimating the term…
Abstract
Cooling air compulsorily introduced from an air inflow hole 18 into a duct 10 by means of a fan 5 is compressed within the duct 10 and enters a duct 13 from an air outflow hole 11 through an air inflow hole 12 to be injected into a package 23 from an air outflow hole 14 through an air inflow hole 15. Subsequently, it flows along both surfaces of a printed circuit board 21, during which it exchanges heat with the heat evolving portion of the printed circuit board 21 to flow out from an air outflow hole 16 into the container body 1. From the interior of a container body 1, air flows out through an air outflow hole 17 to the exterior. The printed circuit board 21 can be cooled efficiently with a small air flow rate and an excellent performance of electromagnetic shielding can be achieved.
Claims20
A case for shielding electronic circuit members from electromagnetic waves, comprising:
- at least one electronic circuit package (23) accommodating an electronic circuit member (21) within an electrically conductive case (20), said electrically conductive case shields said electronic circuit member from said electromagnetic waves;
- a container body (1) having an aperture for letting in and out said at least one electronic circuit package (23) therethrough and a space for accommodating said at least one electronic circuit package;
- and
- a lid body (3) adapted to fit to said aperture of the container body;
- said at least one electronic circuit package (23) having a connector portion (22) carrying terminals of said electronic circuit member (21), said container body (1) having a receptacle (7) connected to said connector portion (22) of said at least one electronic circuit package (23) which is accommodated within said space;
- said container body (1) forming therethrough a first air inflow hole (18) communicating with an environment outside said container body, a first air outflow hole (11) formed at a portion abutting on said lid body fitted to said container body (1) and a first duct (10) for communicating said first air inflow hole (18) with said first air outflow hole (11);
- said lid body forming therethrough a second air inflow hole (12) disposed at a position corresponding to said first air outflow hole (11) of the container body (1) fitted to said lid body (3), a second air outflow hole (14) formed at a portion opposed to said at least one electronic circuit package which is accommodated within said space of the container body (1) and a second duct (13) for communicating said second air inflow hole with said second air outflow hole (14);
- said electrically conductive case of the at least one electronic circuit package forming therethrough a third air inflow hole (15) disposed at a portion corresponding to said second air outflow hole (14) of said lid body (3) fitted to said container body (1) and a third air outflow hole (16);
- and further
- said container body (1) forming therethrough a fourth air outflow hole (17) communicating with the environment outside said container body.
7 more elements
A case for shielding electronic circuit members from electromagnetic waves, comprising:
- at least one electronic circuit package (23) accommodating an electronic circuit member (21) within an electrically conductive case (20), said electrically conductive case shields said electronic circuit member from said electromagnetic waves;
- a container body (1) having an aperture for letting in and out said at least one electronic circuit package (23) therethrough and a space for accommodating said at least one electronic circuit package (23);
- and
- a lid body (3) adapted to fit to said aperture of the container body (1);
- said at least one electronic circuit package (23) having a connector portion (22) carrying terminals of said electronic circuit member (21), said container body (1) having a receptacle (7) connected to said connector portion (22) of said at least one electronic circuit package (23) which is accommodated within said space;
- said container body (1) forming therethrough a first air outflow hole communicating with an environment outside said container body, a first air inflow hole (11') formed at a portion abutting on said lid body (3) fitted to said container body (1) and a first duct (10) for communicating said first air outflow hole with said first air inflow hole (11);
- said lid body (1) forming therethrough a second air outflow hole (12') disposed at a position corresponding to said first air inflow hole (11') of the container body (1) fitted to said lid body (3), a second air inflow hole (14') formed at a portion opposed to said at least one electronic circuit package (23) which is accommodated within said space of the container body (1) and a second duct (13) for communicating said second air outflow hole (12') with said second air inflow hole (14');
- said electrically conductive case of the at least one electronic circuit package (23) forming therethrough a third air outflow hole (15') disposed at a portion corresponding to said second air inflow hole (14') of said lid body (3) fitted to said container body (1) and a third air inflow hole (16');
- and further
- said container body (1) forming therethrough a fourth air inflow hole (17') communicating with the environment outside said container body.
7 more elements
A case for shielding electronic circuit members from electromagnetic waves, comprising:
- (a) a container body (1);
- (b) an electrically conductive case (20) for shielding said electronic circuit members from said electromagnetic waves, containing at least one electronic circuit member (21), said electrically conductive case (20) being disposed within said container body (1) and having a connector portion (22) for connecting to an electrical connecting portion (7) provided at said container body (1);
- (c) at least one first cooling air hole (15) formed at a front portion of said electrically conductive case;
- (d) a front cover (3) supported at a front portion of said container body (1);
- (e) a second cooling air hole (14) formed at an internal surface of said front cover (3) to communicate with said first cooling air hole (15) of the electrically conductive case;
- (f) a first duct (13) formed within said front cover so as to communicate with said second cooling air hole thereof;
- (g) a third cooling air hole (11) formed through said container body (1) so as to communicate with said first duct (13) of said front cover (3);
- (h) a second duct (10) formed within said container body (1) so as to communicate with said third cooling air hole thereof.
5 more elements
Dependencies are inferred from the claim text.