Title:
電子管
Document Type and Number:
Japanese Patent JP4646316
Kind Code:
B2
Abstract:
In an electron tube (1), one end of an insulating tube (9) is protruded toward the inside of an envelope (2), and an APD (15) is provided on the one end of the insulating tube (9). Another end of the insulating tube (9) is connected to an outer stem (6) of the envelope (2). Alkali sources (27, 27) are provided inside the envelope (2). The alkali sources (27, 27) are disposed inside the envelope (2) and generates alkali metal vapor to thereby form a photocathode (11) on a predetermined part of the internal surface of the envelope (2). The alkali sources (27, 27) and insulating tube (9) are isolated from each other by a separating member (21', 23', 26). When the electron tube (1) is manufactured, the alkali metal vapor that is generated from the alkali sources (27, 27) is not deposited on the insulating tube (9) due to existence of the separating member (21', 23', 26). This prevents voltage resistance between the envelope (2) and APD (15) from being decreased and the electrical field in the electron tube (1) from being adversely affected, thereby preventing incident efficiency of electrons to the APD (15) from being decreased.
Inventors:
Suyama Motohiro
Hiroyuki Hisashima
Yasuharu Negi
Hirohito Fukasawa
Katsuhiko Kawai
Yasuyuki Egawa
Atsushi Uchiyama
Kimura Suenori
Hiroyuki Hisashima
Yasuharu Negi
Hirohito Fukasawa
Katsuhiko Kawai
Yasuyuki Egawa
Atsushi Uchiyama
Kimura Suenori
Application Number:
JP2005513891A
Publication Date:
March 09, 2011
Filing Date:
September 09, 2004
Export Citation:
Assignee:
Hamamatsu Photonics Co., Ltd.
International Classes:
H01J40/06; H01J9/233; H01J40/04; H01J40/14; H01J40/16
Domestic Patent References:
| JPH09297055A | 1997-11-18 | |||
| JP46019162A |
Foreign References:
| US4315184A | 1982-02-09 | |||
| EP0805478B1 | 2005-07-20 |
Attorney, Agent or Firm:
Kazuhiro Kitazawa
Shin Koizumi
Akiko Ichikawa
Shin Koizumi
Akiko Ichikawa