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:
Mar. 25, 2003
Filed:
Nov. 28, 2000
Hideki Shimoi, Hamamatsu, JP;
Hiroyuki Kyushima, Hamamatsu, JP;
Yutaka Hasegawa, Hamamatsu, JP;
Toshimitsu Nagai, Hamamatsu, JP;
Hamamatsu Photonics K.K., Hamamatsu, JP;
Abstract
To prevent the deterioration in sensitivity of the photocathode ( ) of an electron tube and maintain stable output for a long time, an ion confining electrode ( ) and an ion trap electrode ( ) are provided between the photocathode ( ) and a first stage dynode ( ). The potential of the ion confining electrode ( ) is set higher than that of the first stage dynode ( ), while the potential of the ion trap electrode ( ) is set equal to or higher than that of the photocathode ( ) and lower than that of the first stage dynode Since the feedback to the photocathode ( ) of the positive ions generated in the vicinity of the first stage dynode can be effectively suppressed, the sensitivity of the photocathode ( ) is prevented from decreasing, and stable output is maintained for a long time.