Method for making infrared detector dewar

Details Method for making infrared detector dewar Method for making infrared detector dewar

1985-01-08

1986-07-01

Goldberg, Howard N.

Metal working

Method of mechanical manufacture

Electrical device making

29841, 29856, H01R 4300

Patent

active

045971757

ABSTRACT:
A vacuum dewar for infrared detectors is disclosed, in which unitary Kovar leads are used to reduce heat load and improve reliability and ruggedness. The Kovar leads are encapsulated in the glass walls of the hollow stem which carries the sensor array and supplies cryogenic fluid for cooling the array. The Kovar leads extend throughout the entire length of the stem to form both the electrical feed-through and the contact points at each end of the stem for the attachment of wire leads or cables, and to form a reinforcing structure for the stem. A fabrication method is also disclosed, in which a unitary Kovar leadframe is held under tension while two concentric glass tubes, between which the leadframe is vacuum-sandwiched, are fused together to form a stem encapsulating continuous Kovar leads throughout its length, while preventing excessive oxidation of the Kovar leads.

REFERENCES:
patent: 3719990 (1973-03-01), Long et al.
patent: 4005288 (1977-01-01), Robillard
patent: 4206354 (1980-06-01), Small, Jr.
patent: 4487037 (1984-12-01), Meignin et al.
patent: 4491729 (1985-01-01), Stahl et al.

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