US006273812B1
(io) Patent No.: US 6,273,812 Bl (45) Date of Patent: Aug. 14,2001
(54) HERMETIC TYPE OUTDOOR EQUIPMENT PROVIDED WITH RESPIRATORY STRUCTURE
(75) Inventor: Kazuo Komatsu, Tokyo (JP)
(73) Assignee: NEC Corporation, Tokyo (JP)
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.
(21) Appl. No.: 09/387,723
(22) Filed: Sep. 1, 1999
(30) Foreign Application Priority Data
Sep. 8, 1998 (JP) 10-254328
(51) Int. C I. H05K 5/00
(52) U.S. CI 454/184; 55/385.6
(58) Field of Search 454/184; 55/385.4,
55/385.6, 385.7; 174/50, 17 VA, 15.1
(56) References Cited
U.S. PATENT DOCUMENTS
4,981,805 * 1/1991 Yazawa et al 436/169
A hermetic type outdoor equipment such as radio relay equipment is provided with a respiratory structure (8) having a minute-hole sheet (5) applied to a respiratory hole (4) of a case (3) of the equipment, and capillary members (9) implanted outwardly on a surface of the minute-hole sheet (5). The equipment case (3) is composed of a lower housing (2) and an upper housing (1) hermetically engaged with the lower housing (2), and the respiratory hole (4) is formed through the lower housing (2). The minute-hole sheet (5) is disposed at the inner surface side of the case (3), and the capillary members (9) extend outwardly within the respiratory hole (4). Aplate (6) having an opening (6a) at a position corresponding to the respiratory hole (4) and superimposed to the minute-hole sheet (5) and the minute-hole sheet (5) is fixed to the lower housing (2) of the case (3) by screws (7).
8 Claims, 4 Drawing Sheets
