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. 28, 2014
Filed:
Jul. 29, 2011
Kiyoshi Ogata, Minato-ku, JP;
Yoshihiro Takeda, Ome, JP;
Tetsuo Kani, Yokohama, JP;
Makoto Kanbe, Fussa, JP;
Naohisa Osaka, Ome, JP;
Takahisa Sato, Higashiyamato, JP;
Kiyoshi Ogata, Minato-ku, JP;
Yoshihiro Takeda, Ome, JP;
Tetsuo Kani, Yokohama, JP;
Makoto Kanbe, Fussa, JP;
Naohisa Osaka, Ome, JP;
Takahisa Sato, Higashiyamato, JP;
Rigaku Corporation, Akishima-Shi, Tokyo, JP;
Abstract
An industrial X-ray tube formed by accommodating a cathode and anode in a container having an evacuated interior, in which electrons emitted from the cathode are caused to strike the anode and X-rays are emitted from the anode. The cathode is formed from graphite. The graphite is a layered crystal obtained by layering a plurality of carbon hexagonal planes. The graphite is cut based on crystal axes of the carbon hexagonal planes. The resulting cut surface is caused to function as an electron-emitting surface. For example, directions of an a- and b-crystal axis may be set so as to be arbitrary between each of the layers of the carbon hexagonal planes, the graphite may be cut along a surface parallel to the c-axis, and the resulting cut surface may be caused to function as an electron-emitting surface. The graphite may also be cut along a surface orthogonal to the c-axis.