Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1990-01-23
1992-06-09
Thompson, Gregory D.
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
174 154, 361381, H05K 720
Patent
active
051212927
ABSTRACT:
A cryocooled field-replaceable logic unit for use with a cryogenic cold head such as that of a cryocooler comprises a thermally conductive plate adapted to be disposed in thermal contact with the cold head, a thermally insulating enclosure portion cooperating with the conductive plate to form a sealed enclosure detachable from the cold head, and one or logic chips mounted in the enclosure in thermal contact with the conductive plate. Preferably the conductive plate is attached to the thermally insulating portion through a resilient mounting which forms a recess for receiving the cold head and which is tension-loaded when the logic unit is mounted on the cold head to urge the plate into intimate thermal contact with the cold head. In one embodiment the enclosure receives from an external source a supply of gaseous nitrogen which is liquified by contact with the conductive plate to form a pool of liquid nitrogen in which the logic chips are immersed. In another embodiment plural logic units are detachably mounted on passive cold heads immersed in a cryostat.
REFERENCES:
patent: 3412320 (1968-11-01), Marshall
patent: 3812402 (1974-05-01), Garth
patent: 4502296 (1985-03-01), Ogata et al.
patent: 4907124 (1990-03-01), Kaufman
patent: 4980754 (1990-12-01), Kotani et al.
Bell David F.
Birchall Raymond D.
Carlson Harry A.
Harris Willard S.
Ossolinski Edward J.
International Business Machines - Corporation
Kinnaman William A.
Thompson Gregory D.
Walker Mark S.
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