Secondary electron multiplication target
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorsHiroshi Washida, Kensaku Yano, Yoshio Yamaoka
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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.
Claims4
A secondary electron multiplication target for a camera tube, comprising:
- platelike signal electrode means formed of a conductive material, for removing secondary electrons to form a camera tube output signal;
- a first porous layer consisting essentially of MgF.sub.2 deposited on one side of said signal electrode for emitting secondary electrons in response to photoelectrons transmitted thereto through said signal electrode;
- and
- a second porous layer formed of carbon deposited on said first porous layer on its opposite side from said signal electrode and having a lower secondary electron emitting ratio than that of said first porous layer and a dielectric constant of 6 or less.
Dependencies are inferred from the claim text.