The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 13, 2007
Filed:
Sep. 09, 2004
Motohiro Suyama, Hamamatsu, JP;
Hiroyuki Kyushima, Hamamatsu, JP;
Yasuharu Negi, Hamamatsu, JP;
Atsuhito Fukasawa, Hamamatsu, JP;
Yoshihiko Kawai, Hamamatsu, JP;
Yasuyuki Egawa, Hamamatsu, JP;
Atsushi Uchiyama, Hamamatsu, JP;
Suenori Kimura, Hamamatsu, JP;
Motohiro Suyama, Hamamatsu, JP;
Hiroyuki Kyushima, Hamamatsu, JP;
Yasuharu Negi, Hamamatsu, JP;
Atsuhito Fukasawa, Hamamatsu, JP;
Yoshihiko Kawai, Hamamatsu, JP;
Yasuyuki Egawa, Hamamatsu, JP;
Atsushi Uchiyama, Hamamatsu, JP;
Suenori Kimura, Hamamatsu, JP;
Hamamatsu Photonics K.K., Hamamatsu, JP;
Abstract
In an electron tube, one end of an insulating tube is protruded toward the inside of an envelope, and an avalanche photodiode (APD) is provided on the one end of the insulating tube. Another end of the insulating tube is connected to an outer stem of the envelope. Alkali sources are provided inside the envelope. The alkali sources are disposed inside the envelope and generates alkali metal vapor to thereby form a photocathode on a predetermined part of the internal surface of the envelope. The alkali sources and insulating tube are isolated from each other by a separating member. When the electron tube is manufactured, the alkali metal vapor that is generated from the alkali sources is not deposited on the insulating tube due to existence of the separating member. This prevents voltage resistance between the envelope and APD from being decreased and the electrical field in the electron tube from being adversely affected, thereby preventing incident efficiency of electrons to the APD from being decreased.