Title:
電子管
Document Type and Number:
Japanese Patent JP4471609
Kind Code:
B2
Abstract:
An envelope (2) has a glass bulb body (4) and a glass bulb base (5). The glass bulb body (4) includes an upper hemisphere (4a) and a lower hemisphere (4b). The upper hemisphere (4b) is curved in a substantially spherical shape. The lower hemisphere (4b) is substantially curved in a spherical shape and connects the upper hemisphere (4a) and glass bulb base (5). The upper hemisphere (4a), the lower hemisphere (4b), and glass bulb base (5) are integrally formed. A photocathode (11) is formed on the inner surface of the glass bulb body (4). An APD (15) is disposed on the glass bulb body (4) side relative to an intersection (S) between an imaginary extended curved surface (I) of the lower hemisphere (4b) within the glass bulb base (5) and an axis (Z). When light enters the photocathode (11), electrons are emitted from the photocathode (11). The electrons are converged at the position above and in the vicinity of the APD (15) by an electrical field in the electron tube (1), so that the electrons enter the APD (15) in an efficient manner and are detected satisfactorily.
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Inventors:
Hiroyuki Hisashima
Suyama Motohiro
Kimura Suenori
Yasuharu Negi
Hirohito Fukasawa
Katsuhiko Kawai
Atsushi Uchiyama
Yasuyuki Egawa
Suyama Motohiro
Kimura Suenori
Yasuharu Negi
Hirohito Fukasawa
Katsuhiko Kawai
Atsushi Uchiyama
Yasuyuki Egawa
Application Number:
JP2003318203A
Publication Date:
June 02, 2010
Filing Date:
September 10, 2003
Export Citation:
Assignee:
Hamamatsu Photonics Co., Ltd.
International Classes:
H01J40/04; H01J43/28; H01J40/12; H01J40/14; H01J40/16; H01J43/18
Domestic Patent References:
| JP8148114A | ||||
| JP9297055A | ||||
| JP11102658A |
Attorney, Agent or Firm:
Kazuhiro Kitazawa
Shin Koizumi
Akiko Ichikawa
Shin Koizumi
Akiko Ichikawa