Electron-optical image tube

Details Electron-optical image tube Electron-optical image tube

1975-06-09

1977-05-03

Segal, Robert

Electric lamp and discharge devices

Geiger-mueller type

250213VT, H01J 3904, H01J 3900

Patent

active

040216934

ABSTRACT:
An electron-optical image tube including a photocathode, an extraction electrode consisting of a mesh on the emission side of the photocathode, and a focussing electrode on the side of the mesh remote from the photocathode, achieves increased time resolution, improved spatial resolution, and reduced magnification at a phosphor screen by making the photocathode to mesh spacing small compared with the mesh to focussing electrode spacing. An improved photocathode plate avoids large electric fields at sharp points on the photocathode surface. Additional annular electrodes and flared deflector electrodes in the drift section of the tube prevent scattering of electrons from the tube walls on to the screen.

REFERENCES:
patent: 3109957 (1963-11-01), McGee et al.
patent: 3439222 (1969-04-01), Driard et al.
patent: 3761614 (1973-09-01), Bradley

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