Electricity: conductors and insulators – Boxes and housings – Hermetic sealed envelope type
Reexamination Certificate
2005-04-26
2005-04-26
Reichard, Dean A. (Department: 2831)
Electricity: conductors and insulators
Boxes and housings
Hermetic sealed envelope type
C218S118000, C218S136000
Reexamination Certificate
active
06884940
ABSTRACT:
A main circuit switching unit and an isolator are accommodated in a vacuum container. A first conductor and a main circuit conductor are arranged to extend in and out of the vacuum container. A movable electrode of the main circuit switching unit is connected to the first conductor through a first flexible conductor, and a movable electrode of the isolator is connected to the main circuit conductor through a second flexible conductor. A shield is arranged around the first conductor and the main circuit conductor. Another shield is arranged around a connecting portion between the first flexible conductor and the movable electrode of the main circuit switching unit. A still another shield is arranged around the isolator. A further another shield is arranged around the second flexible conductor. These shields are secured to the vacuum container through insulating spacers. This arrangement instantly eliminates a dielectric breakdown phenomenon that occurs at electric field concentrated regions by the shields to prevent a dielectric breakdown caused by particulate foreign matters and thereby improve an insulation reliability of the devices.
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patent: 6153846 (2000-11-01), Morita et al.
patent: 6426627 (2002-07-01), Kikukawa et al.
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patent: 1381064 (2004-01-01), None
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Patent Abstracts of Japan for JP-2001-346306.
Patent Abstracts of Japan for JP 2001-307603.
Patent Abstracts of Japan for JP 2001-176364.
Kobayashi Masato
Satou Kazuhiro
Shirone Takashi
Tsuchiya Kenji
Utsumi Tomoaki
Crowell & Moring LLP
Oliva Carmelo
Reichard Dean A.
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