Field Effect Tube (Algemeen)

door Maurice , Dordrecht, 03.06.2014, 17:42 (3829 dagen geleden) @ Frank Philipse

Soms is zoeken in patenten ook een optie, vind je vaak uitgebreide info.
http://www.freepatentsonline.com/3746905.pdf
Pagina 3 vind je de achtergrond van de vinding.

HIGH VACUUM, FIELD EFFECT ELECTRON TUBE
United States Patent 3746905
Abstract:
An improved electron tube is provided which eliminates the need for a heated electron source and affords simplified construction. The tube, a high vacuum tube, is capable of operating over an extended range of electrical potentials. The electron tube operates on the principle of electric field effect emission for the electron source, requiring neither gas, vapor nor a heated electrode in its envelope. Two active elements, an emitter and a collector, are enclosed in an evacuated chamber with outside connections to each element. The collector is a metal plate and the emitter is an oxide-metal composite which contains a very large number of metal filaments embedded in an insulating oxide matrix. The number of filaments normally exceed one million per square centimeter of exposed surface, having ends connected on the back side to a conducting plate for external connection.