Patent Number: 6,297,489

Title: Electron tube having a photoelectron confining mechanism

Abstract: This invention relates to an electron tube having a structure for enabling a stable operation for a long time. In the electron tube, at least a confining mechanism is arranged between a photocathode and the electron incident surface of a semiconductor device, which are arranged to oppose each other. In the arrangement, the area of the opening of the confining mechanism is at least equal to or smaller than that of the electron incident surface, thereby confining the orbits of photoelectrons from the photocathode. This structure avoids bombardment of electrons arriving at portions other than the electron incident surface of the semiconductor device and prevents the semiconductor device from being unnecessarily charged.

Inventors: Suyama; Motohiro (Hamamatsu, JP), Kimura; Suenori (Hamamatsu, JP), Saito; Tetsuya (Hamamatsu, JP), Morita; Tetsuya (Hamamatsu, JP)

Assignee: Hamamatsu Photonics K.K.

International Classification: H01J 43/28 (20060101); H01J 43/00 (20060101); H01J 43/04 (20060101); H01J 43/08 (20060101); H01J 043/12 ()

Expiration Date: 10/02/2018