Ground plane insulating coating for proximity focused devices

Details Ground plane insulating coating for proximity focused devices Ground plane insulating coating for proximity focused devices

1993-03-05

1998-07-14

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Image pickup tube

H01J 4304

Patent

active

057809615

ABSTRACT:
A thin layer of alumina (aluminum oxide) is coated onto the ground plane of a microchannel plate (MCP) without covering the pores of the MCP so it does not effect the performance. The coating is sputtered onto the ground plane at a very steep angle. The addition of the thin dielectric coating of alumina greatly improves the spatial resolution of proximity focused image intensifiers using a narrow gap between the phosphor screen and the MCP. With the coating on the ground plane and the same gap the phosphor screen can be ran at 9000 volts, as compared to 3 kV without the coating.

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patent: 4996414 (1991-02-01), Frank et al.
patent: 5268612 (1993-12-01), Aebi et al.

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