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:
Jan. 25, 1994
Filed:
Feb. 19, 1992
Applicant:
Inventors:
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
313309 ; 313336 ; 313351 ;
Abstract
An electron emission element includes an insulating substrate. A base electrode is formed on the insulating substrate. A plurality of emitters are formed on the base electrode and are arranged radially with respect to a given point. The emitters have wedge shapes with their respective tips facing inward. An insulating layer is formed on the substrate and the base electrode, and is spaced from the wedges of the emitters by given gaps. A control electrode is formed on the insulating layer for enabling electrons to be emitted from the tips of the wedge-shaped emitters.