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:
Aug. 27, 2013
Filed:
Oct. 03, 2008
Ryozo Nonogaki, Shibukawa, JP;
Yoshinori Terui, Shibukawa, JP;
Ryozo Nonogaki, Shibukawa, JP;
Yoshinori Terui, Shibukawa, JP;
Denki Kagaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
Provided is an electron source which outputs a stable electron beam even when vibration is applied from the external to an apparatus which uses the electron source. The electron source is provided with an insulator (); two conductive terminals () arranged at an interval on the insulator (); a long filament () stretched between the conductive terminals (); and a needle-like cathode () having an electron emitting section attached to the filament (). The vertical cross-section shape of the filament () in the axis direction has a long direction and a short direction, and the maximum length in the long direction is 1.5 times or more but not more than 5 times the maximum length in the short direction.