Secondary electron multiplication target

Details Secondary electron multiplication target Secondary electron multiplication target

1980-10-16

1982-12-28

Segal, Robert

Electric lamp and discharge devices

Cathode ray tube

Image pickup tube

313107, H01J 3148

Patent

active

043664130

ABSTRACT:
A secondary electron multiplication target includes first and second porous layers laminated on a signal electrode. The first porous layer is formed of MgF.sub.2 which, having a high secondary electron emitting ratio and a dielectric constant of 6 or less, produces a great number of secondary electrons in response to photoelectrons incident thereupon across the signal electrode. The second porous layer is formed of carbon which has a low secondary electron emitting ratio and hence a high crossover potential, as well as a dielectric constant of 6 or less.

REFERENCES:
patent: 2909687 (1959-10-01), Turk et al.
patent: 3061752 (1962-10-01), Banks
patent: 3534207 (1970-10-01), Blamoutier et al.
patent: 3546514 (1970-12-01), Blamoutier
patent: 3657596 (1972-04-01), Goetze et al.
McMullan et al., Reprinted from Electronics Letters, vol. 4, #17, Aug. 23, 1968; "Stable SEC Target for Television Camera Tubes".

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