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. 03, 2002
Filed:
Mar. 25, 1999
Applicant:
Inventors:
Nobuya Seko, Tokyo, JP;
Yoshinori Tomihari, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J 1/30 ; H01J 1/304 ;
U.S. Cl.
CPC ...
H01J 1/30 ; H01J 1/304 ;
Abstract
In a field emission cold cathode device having a block defined by a contour and a plurality of holes arranged in the block, each hole is uniform in shape to obtain a uniform electric current in the block when emitter cones are located in the uniform holes. A distorted hole is not arranged in the block or holes which are susceptible to be distorted are shifted or moved to other zones which are not distorted. Such uniform holes can be also obtained by preparing mask patterns of different sizes and by transcribing the mask patterns onto photoresist.