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. 11, 2011
Filed:
Apr. 29, 2010
Hirotomo Taniguchi, Saitama, JP;
Toshiharu Sumiya, Ebina, JP;
Hisanobu Azuma, Hadano, JP;
Takanori Suwa, Kawasaki, JP;
Hirotomo Taniguchi, Saitama, JP;
Toshiharu Sumiya, Ebina, JP;
Hisanobu Azuma, Hadano, JP;
Takanori Suwa, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
In an electron beam apparatus including an electron emission element and an anode, the electron emission element includes a gateand a cathodehaving a projection portion. The gateand the cathodeare located in a surface of an insulating memberincluding a recess. The projection portion of the cathodehas a height distribution, and an average value dav (m) of a shortest distance between the gateand the projection portion of the cathodeand a difference h (m) between the average value dav and a shortest distance dmin (m) from the gateto a maximum convex portion of the projection portion of the cathodesatisfy a relationship of h/dav<0.39.