公开(公告)号：US20200149959A1

公开(公告)日：2020-05-14

申请号：US16628350

申请日：2018-06-15

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Atsuhito FUKASAWA ,  Yasuyuki EGAWA ,  Shigeru ICHIKAWA ,  Yasuharu NEGI

IPC: G01J1/44

Abstract: An electron tube includes a photoelectric surface, an avalanche photodiode, a focusing electrode part that accelerates and focuses the electrons E from the photoelectric surface toward the avalanche photodiode, and a casing including a stem provided with the avalanche photodiode. The stem is provided with a light incident hole through which the light is transmitted, and the periphery of the light incident hole is light-shielded by the stem. The focusing electrode part includes a first region provided with a light passage hole, and a second region provided with an electron passage hole that guides the electrons to the avalanche photodiode. The first region is formed on an axial line that connects the light incident hole and the photoelectric surface. The second region is formed on an axial line that connects the photoelectric surface and the avalanche photodiode.