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:
May. 09, 2017
Filed:
Nov. 05, 2013
Futaba Corporation, Mobara-shi, Chiba, JP;
Hamamatsu Photonics K.k., Hamamatsu-shi, Shizuoka, JP;
Tatsuya Nakamura, Hamamatsu, JP;
Norimasa Kosugi, Hamamatsu, JP;
Naoki Okumura, Hamamatsu, JP;
Yoshitaka Sato, Mobara, JP;
Akira Matsumoto, Mobara, JP;
Yoshihisa Marushima, Mobara, JP;
Kazuhito Nakamura, Mobara, JP;
Futaba Corporation, Mobara-shi, Chiba, JP;
HAMAMATSU PHOTONICS K.K., Hamamatsu-shi, Shizuoka, JP;
Abstract
In an X-ray radiation source, a counter wall made of alkali-containing glass, out of walls of a housing of an X-ray tube, is arranged opposite to a high-voltage region VH of a power supply unit including a high-voltage generation module which generates a negative high voltage to be applied to a filament. This configuration prevents an electric field from being generated in the counter wall and thus suppresses precipitation of alkali ions from the glass. Therefore, it prevents change in potential relationship between electrodes at different potentials such as the filament, grid, and target and prevents occurrence of a trouble of failure in maintaining a desired X-ray amount, thus enabling stable operation to be maintained.