Title:
PHOTOELECTRIC CATHODE AND ELECTRON TUBE
Document Type and Number:
Japanese Patent JP3429671
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a photoelectric cathode with good sensitivity in an infrared region and an electron tube using it.
SOLUTION: A photoelectric cathode is formed to emit photoelectrons corresponding to an incident light in a infrared region. In this case, it includes an InP substrate 1, an InAsx2P1-x2 (0<x2<1) buffer layer 2 of a first conductive type lattice-matched thereto, an Inx1Ga1-x1As (0<x1<0.53) light absorbing layer 3 of a first conductive type lattice-matched thereto, an InAsx3P1-x3 (0<x3<1) electron emitting layer 4 of a first conductive type lattice-matched thereto, an InAsx3P1-3x contact layer 5 of a second conductive type formed into a preset pattern thereon for exposing the electron emitting layer 4 in almost uniform distribution, an active layer 8 of alkarine metal or its oxide or its fluoride formed on the exposed surface of the electron emitting layer 4, a first electrode 6 on the contact layer 5 and a second electrode 7 below the substrate 1.
Inventors:
Minoru Arakaki
Toru Hirohata
Tomoko Mochizuki
Hirofumi Suga
Toru Hirohata
Tomoko Mochizuki
Hirofumi Suga
Application Number:
JP10136498A
Publication Date:
July 22, 2003
Filing Date:
April 13, 1998
Export Citation:
Assignee:
Hamamatsu Photonics K.K.
International Classes:
H01J1/34; H01J29/38; H01J31/50; H01J40/06; H01J43/08; (IPC1-7): H01J1/34; H01J29/38; H01J31/50; H01J40/06; H01J43/08
Domestic Patent References:
| JP8255580A | ||||
| JP5234501A | ||||
| JP9213204A | ||||
| JP7245057A |
Attorney, Agent or Firm:
Yoshiki Hasegawa (2 outside)