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:
Apr. 05, 1983
Filed:
Oct. 17, 1980
Shigeyuki Hosoki, Hachioji, JP;
Shigehiko Yamamoto, Tokorozawa, JP;
Hideo Todokoro, Hinodemachi, JP;
Susumu Kawase, Higashimurayama, JP;
Yasuharu Hirai, Chofu, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A field emission cathode of the present invention is characterized by the possession of a special layer which is adsorbed onto the surfaces of a tip that is joined to the top of a hairpin-shaped filament. This layer is formed by adsorbing a selected metal via oxygen to a thickness which does not exceed the thickness of the monolayer of atoms. The metal will be selected from chromium, aluminum, cerium, magnesium, titanium, silicon, zirconium or hafnium. The field emission cathode features that the electrons are emitted in a concentrated manner from a particular crystal plane among the crystal planes of the tip. Therefore, it is possible to obtain a field emission cathode having very small emission angle of electrons.