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:
Mar. 01, 2011
Filed:
Jun. 27, 2007
Yoshiyuki Yamamoto, Itami, JP;
Akihiko Ueda, Itami, JP;
Yoshiki Nishibayashi, Itami, JP;
Takahiro Imai, Itami, JP;
Yoshiyuki Yamamoto, Itami, JP;
Akihiko Ueda, Itami, JP;
Yoshiki Nishibayashi, Itami, JP;
Takahiro Imai, Itami, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
An object is to provide an electron emitting cathode achieving high luminance, low energy dispersion, and long life. It is therefore an object to provide a diamond electron emitting cathode graspable on a sufficiently stable basis, sharpened at the tip, and improved in electric field intensity. A diamond electron emitting cathodeaccording to the present invention is partitioned into at least three regions, i.e., a front end regionintended for electron emission at a tip of columnar shape, a rear end regionintended for grasping opposite in the longitudinal direction, and a thinned intermediate region, a cross-sectional area of the rear end region is not less than 0.2 mm, the tip of the front end region is sharpened, and a maximum cross-sectional area of the thinned intermediate region is not more than 0.1 mm.