High thermal efficiency dispenser-cathode and method of manufact

Details High thermal efficiency dispenser-cathode and method of manufact High thermal efficiency dispenser-cathode and method of manufact

1991-08-08

1993-06-08

O'Shea, Sandra L.

Electric lamp and discharge devices

With support and/or spacing structure for electrode and/or...

For indirectly heated cathode

313284, 313292, 313310, 313326, 313337, 313346DC, 313346R, H01J 122, H01J 128/19/06, H01J 1912

Patent

active

052182630

ABSTRACT:
A reservoir dispenser cathode structure having improved thermal efficiency is provided by inner and outer subassemblies. The inner subassembly has a molybdenum heater cup to which a tungsten-rhenium alloy cap is laser seam-welded. The outer subassembly has a tantalum support cylinder within which the inner subassembly is supported by means of a three-point suspension in the form of tabs that are lanced from the tantalum cylinder and spot-welded to the heater cup. The heater has a coiled-coil design wherein the coils are coated with Al.sub.3 O.sub.3 and small particle tungsten powder to increase the coil's thermal emissivity. This thermally-efficient structure permits the achievement of high current density (greater than 3 Amperes per square centimeter) with heater power that is less than 1.3 Watts.

REFERENCES:
patent: 3551727 (1970-12-01), Jensen et al.
patent: 4101800 (1978-07-01), Thomas et al.
patent: 4165473 (1979-08-01), Falie
patent: 4417173 (1983-11-01), Tuck et al.
patent: 4823044 (1989-04-01), Falie
patent: 4855637 (1989-08-01), Watanabe et al.
patent: 5030879 (1991-07-01), Derks
patent: 5041757 (1991-08-01), Longo et al.

Affiliated with

Also associated with

Rating

High thermal efficiency dispenser-cathode and method of manufact does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with High thermal efficiency dispenser-cathode and method of manufact, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High thermal efficiency dispenser-cathode and method of manufact will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1944705