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:
Apr. 06, 2010
Filed:
Mar. 08, 2006
Hiroyuki Kyushima, Hamamatsu, JP;
Motohiro Suyama, Hamamatsu, JP;
Suenori Kimura, Hamamatsu, JP;
Yasuharu Negi, Hamamatsu, JP;
Atsuhito Fukasawa, Hamamatsu, JP;
Yoshihiko Kawai, Hamamatsu, JP;
Atsushi Uchiyama, Hamamatsu, JP;
Yasuyuki Egawa, Hamamatsu, JP;
Hiroyuki Kyushima, Hamamatsu, JP;
Motohiro Suyama, Hamamatsu, JP;
Suenori Kimura, Hamamatsu, JP;
Yasuharu Negi, Hamamatsu, JP;
Atsuhito Fukasawa, Hamamatsu, JP;
Yoshihiko Kawai, Hamamatsu, JP;
Atsushi Uchiyama, Hamamatsu, JP;
Yasuyuki Egawa, Hamamatsu, JP;
Hamamatsu Photonics K.K., Hamamatsu-shi, JP;
Abstract
An envelope has a glass bulb body and a cylindrical glass bulb base. The glass bulb body includes an upper hemisphere and a lower hemisphere. The upper hemisphere is curved in a substantially spherical shape. The lower hemisphere is substantially curved in a spherical shape and connects the upper hemisphere and glass bulb base. A photocathode is formed on the inner surface of the glass bulb body. An avalanche photodiode is disposed on the glass bulb body side relative to an intersection between an imaginary extended curved surface of the lower hemisphere within the glass bulb base and an axis. When light enters the photocathode, electrons are emitted from the photocathode. The electrons are converged at the position above and in the vicinity of the APD by an electrical field in the electron tube, so that the electrons enter the APD in an efficient manner and are detected satisfactorily.