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:
Oct. 13, 2015
Filed:
May. 21, 2012
Koji Yamazaki, Ayase, JP;
Kazuyuki Ueda, Tokyo, JP;
Koji Yamazaki, Ayase, JP;
Kazuyuki Ueda, Tokyo, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
The present invention provides a radiation generating tube which suppresses electrical charging of an inner wall of an insulating tube attributable to electron emission from a junction between the insulating tube and a cathode and which has improved voltage withstand capability. The radiation generating tube comprising: a hollow insulating tube; a cathode and an anode respectively bonded to both ends of the insulating tube; and an electron emission source provided on the cathode, the radiation generating tube having a vacuum interior space. The electron emission source includes an electron emitting portion in the interior space, and the insulating tube includes a protrusion that protrudes into the interior space.