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. 28, 2009
Filed:
Sep. 09, 2004
Motohiro Suyama, Hamamatsu, JP;
Hiroyuki Kyushima, 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;
Motohiro Suyama, Hamamatsu, JP;
Hiroyuki Kyushima, 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, JP;
Abstract
In an electron tube, an insulating tube protrudes inside an envelope. One end of the insulating tube is connected to the envelope. An avalanche photo diode (APD) is provided on the other end of the insulating tube. A ground voltage is applied to the envelope and a positive high voltage is applied to the APD. Photoelectrons which are emitted in response to an incident light on a photocathode are converged by an electrical field in the envelope and enter the APD. Thereafter, the incident photoelectrons are amplified and detected. Since a positive high voltage is not exposed to the envelope, the electron tube can easily be handled and is excellent in safety.