Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1977-12-16
1979-04-17
Tupman, W.
Metal working
Method of mechanical manufacture
Assembling or joining
29572, 29589, 204192P, B01J 1700
Patent
active
041493087
ABSTRACT:
An efficient electron emitter cold cathode is formed by first placing an ype monocrystalline substrate of about 100 to about 500 microns in thickness in a furnace. The furnace is heated to about 850.degree. C. to about 900.degree. C. and an N-type layer of about 10 to 15 microns of SnO.sub.2 is deposited onto the top surface of the substrate using a suitable carrier gas. Then, a P-type layer of about 10 microns of SnO.sub.2 is deposited on the N-type layer. The furnace is then cooled at a rate of about 10.degree. C. per minute to about 600.degree. C. to form the emitter. The furnace is then cooled to room temperature and the emitter removed from the furnace. The emitter is subjected to etching and polishing to obtain a P-type layer of about 2 to 4 microns, and a nonreactive metal contact is then deposited on the P-type layer. The emitter is then completed by bonding a metal contact to the base of the N-type monocrystalline substrate.
REFERENCES:
patent: 3811953 (1974-05-01), Nozik
patent: 3815223 (1974-06-01), Allison
patent: 4027192 (1977-05-01), Hanok
Edelberg Nathan
Gordon Roy E.
Kanars Sheldon
The United States of America as represented by the Secretary of
Tupman W.
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