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:
Sep. 15, 2009
Filed:
Mar. 29, 2007
Keisuke Koga, Soraku-gun, JP;
Makoto Yamamoto, Takarazuka, JP;
Akinori Shiota, Ibaraki, JP;
Seigo Kanemaru, Tsukuba, JP;
Masayoshi Nagao, Tsukuba, JP;
Keisuke Koga, Soraku-gun, JP;
Makoto Yamamoto, Takarazuka, JP;
Akinori Shiota, Ibaraki, JP;
Seigo Kanemaru, Tsukuba, JP;
Masayoshi Nagao, Tsukuba, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A stable field-emission electron source that does not suffer from a current drop even after a high-current density operation for a long time is provided. The field-emission electron source includes: a substrate; an insulating layer that is formed on the substrate and that has a plurality of openings; cathodes arranged at the respective openings in order to emit electron beams; a lead electrode formed on the insulating layer in order to control emission of electrons from the respective cathodes; and a surface-modifying layer formed on the surface of each of the cathodes emitting electrons, comprising a chemical bond between a cathode material composing the cathodes and a material different from the cathode material.