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:
Mar. 20, 2001
Filed:
Feb. 05, 1999
Applicant:
Inventors:
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J 1/02 ;
U.S. Cl.
CPC ...
H01J 1/02 ;
Abstract
A field emission device (,) includes an electron emitter (,), a first dielectric focusing layer (,) defining a first aperture (,), and a second dielectric focusing layer (,) defining a second aperture (,). Second dielectric focusing layer (,) is disposed on first dielectric focusing layer (,). The dielectric constant of second dielectric focusing layer (,) is less than the dielectric constant of first dielectric focusing layer (,). During the operation of field emission device (,), electron emitter (,) emits an electron beam (,), which is focused as it travels through first aperture (,) and then through second aperture (,).