Electric lamp or space discharge component or device manufacturi – Apparatus – Having evacuation or degasification means or means to...
Patent
1986-03-19
1987-06-09
Godici, Nicholas P.
Electric lamp or space discharge component or device manufacturi
Apparatus
Having evacuation or degasification means or means to...
445 14, 445 58, H01J 9233
Patent
active
046717781
ABSTRACT:
An imaging device such as a silicon intensifier tube (SIT) has an envelope closed at one end by an input faceplate and at the other end by a camera section which includes a silicon target. A novel appendage processing assembly is in communication with the envelope for forming a photoemissive cathode on an interior surface of the input faceplate. The novel appendage processing assembly includes a conductive tubular sidearm which is attached to the envelope. A chamber is attached at one end of the sidearm. The chamber is closed at the other end by a stem portion having a plurality of conductive stem leads extending therethrough. A contact spring and a connecting rod are provided within the chamber to electrically connect the sidearm to one of the stem leads. At least one alkali metal vapor source and preferably three alkali vapor sources are disposed within the chamber and connected between two of the stem leads to permit electrical resistance heating of the vapor sources. The chamber further includes a U-shaped support rod which has a circular cross-section that is attached at one end to at least one of the stem leads. The closed end of the U-shaped support rod terminates in proximity to the sidearm. A cathode-compatible metal vapor assembly is slidably disposed within the sidearm and chamber. The subassembly includes a source of photoemissive cathode-forming metal, a conductive support rod, a plate member formed of magnetic material, an insulator and a shield. The source of photoemissive cathode-forming metal has a first and a second end. The first end of which is attached to one end of the conductive support rod. The other end of the conductive support rod is attached to the plate member formed of magnetic material. A loop of wire having a circular cross-section is attached to the plate member and slidably communicates with the U-shaped support rod. Since both the wire loop and the U-shaped support rod have a circular cross-section and cross at right angles to one another, the contact area is minimized compared to prior art structures and the sliding friction is reduced, thereby facilitating ingress and egress of at least a portion of the cathode-compatible metal vapor subassembly relative to the envelope. An insulator is disposed around the conductive support rod in proximity to one end thereof and a shield member extends between the second end of the source of photoemissive cathode-forming metal and the insulator. The shield includes a limiting aperture for restricting the deposition of metal from the cathode-forming metal source to the interior surface of the input faceplate.
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Coughlin Jr. Vincent J.
Godici Nicholas P.
Irlbeck Dennis H.
RCA Corporation
Rowan K.
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