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. 03, 2009
Filed:
Sep. 09, 2004
Yasuhara Negi, Hamamatsu, JP;
Atsushi Uchiyama, Hamamatsu, JP;
Yasuyuki Egawa, Hamamatsu, JP;
Hiroyuki Kyushima, Hamamatsu, JP;
Suenori Kimura, Hamamatsu, JP;
Motohiro Suyama, Hamamatsu, JP;
Yasuhara Negi, Hamamatsu, JP;
Atsushi Uchiyama, Hamamatsu, JP;
Yasuyuki Egawa, Hamamatsu, JP;
Hiroyuki Kyushima, Hamamatsu, JP;
Suenori Kimura, Hamamatsu, JP;
Motohiro Suyama, Hamamatsu, JP;
Hamamatsu Photonics K.K., Hamamatsu, JP;
Abstract
A photocathode is formed on a predetermined portion of the internal surface of an envelope of an electric tube. An avalanche photodiode (APD) is provided inside the envelope. The APD is surrounded by a cover and a tubular inner wall. A manganese bead and an antimony bead serving as evaporation sources are disposed in the vicinity outside the inner wall. The manganese bead and the antimony bead are surrounded by a tubular outer wall. The manganese bead and the antimony bead generate metal vapor to thereby form the photocathode. In forming the photocathode, the cover, inner wall, outer wall prevent the metal vapor from being deposited on the APD or an unintended portion inside the electron tube.