公开(公告)号：US20220181111A1

公开(公告)日：2022-06-09

申请号：US17604368

申请日：2020-07-31

Applicant: Photo electron Soul Inc.

Inventor： Haruka SHIKANO ,  Daiki SATO ,  Reiki WATANABE ,  Tomoaki MORIYA ,  Hokuto IIJIMA

IPC: H01J1/34 ,  H01J37/073

Abstract: Provided is a photocathode kit that does not require adjustment of the distance between a photocathode film and a lens focusing on the photocathode film when the photocathode and the lens are installed inside an electron gun. The photocathode kit includes: a photocathode including a substrate in which a photocathode film is formed on a first surface; a lens; and a holder that holds the substrate and the lens, and the holder has a retaining member that retains the photocathode film and the lens to be spaced apart by a predetermined distance, and a first communication path that communicates between inside of the holder and outside of the holder.