Secondary-emissive layers
AssigneeU.S. Philips Corporation
InventorAlan George Knapp
Life of this patent
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Abstract
A substrate bearing a secondary-emissive layer which consists of a cermet consisting of a readily evaporable metal, for example Au, Ag, Cu, Ni, Cr, Al or a nickel-chromium alloy, and an alkali metal aluminium fluoride, for example cryolite. The substrate material may be, for example mild steel, or a synthetic plastics material. It is possible to make large dynodes when using mild steel substrates which are much cheaper than silver-magnesium or beryllium-copper and the secondary-emissive layer does not require an activation treatment when incorporated in an electric discharge tube.
Claims10
An electrode having a secondary-emissive layer, said layer consisting essentially of a cermet comprising a readily-evaporable metal and an alkali aluminum fluoride.
Dependencies are inferred from the claim text.