US 12,033,827 B2
Photocathode kit, electron gun, and electron beam applicator
Haruka Shikano, Nagoya (JP); Daiki Sato, Nagoya (JP); Reiki Watanabe, Nagoya (JP); Tomoaki Moriya, Nagoya (JP); and Hokuto Iijima, Nagoya (JP)
Assigned to Photo electron Soul Inc., Nagoya (JP)
Appl. No. 17/604,368
Filed by Photo electron Soul Inc., Nagoya (JP)
PCT Filed Jul. 31, 2020, PCT No. PCT/JP2020/029447
§ 371(c)(1), (2) Date Oct. 15, 2021,
PCT Pub. No. WO2021/033519, PCT Pub. Date Feb. 25, 2021.
Claims priority of application No. 2019-150764 (JP), filed on Aug. 20, 2019.
Prior Publication US 2022/0181111 A1, Jun. 9, 2022
Int. Cl. H01J 1/34 (2006.01); H01J 37/073 (2006.01)
CPC H01J 1/34 (2013.01) [H01J 37/073 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A photocathode kit comprising:
a photocathode including a substrate on which a photocathode film is formed on a first surface;
a lens which converges excitation light; and
a holder that holds the substrate and the lens,
wherein the holder has
a hollow structure,
a retaining member that retains the photocathode film and the lens to be spaced apart by a predetermined distance, and
a gas vent which is a through hole communicating between inside and outside of the holder to prevent expansion of gas inside the holder in vacuum,
wherein the lens is held in the hollow structure.