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:
May. 18, 1999
Filed:
Sep. 25, 1997
Hironori Imura, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A field emission type cold cathode includes a gate electrode (5), and insulating layer (4) disposed under the gate electrode (5), and emitter cones (7) respectively disposed in cavities penetrating through the insulating layer (4) and the gate electrode (5). The cathode includes a conductive layer (3) which is in contact with the emitter cones (7), and a second insulating layer (2) in the form of a plurality of islands and disposed between the conductive layer (3) and a substrate (1). The conductive layer (3) is electrically connected to the substrate (1) at contact regions. In a preferred embodiment, the conductive layer (3) has pocket regions (3c) for connecting the conductive layer (3) with the substrate (1). The pockets (3c) have a first conductivity, wherein the conductive layer (3) has a second conductivity in the regions that are proximate to the areas in contact with the cones (7). The second conductivity is greater than the first conductivity. The cathode of the present invention provides for uniform operation of the emitter cones (7).