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. 05, 2015
Filed:
Nov. 10, 2010
Masayoshi Nagao, Tsukuba, JP;
Tomoya Yoshida, Tsukuba, JP;
Yoichiro Neo, Hamamatsu, JP;
National University Corporation Sizuoka University, Shizuoka, JP;
Abstract
In a field emission device, the fundamental cause of spherical aberration in an emitted electron beam trajectory is eliminated or mitigated. An aberration suppressor electrodeis provided at a lower vertical position than an extraction gate electrodeso its opening inner peripheral edgefaces a position near an emitter tip. The vertical position of the opening inner peripheral edgeof the aberration suppressor electrodeis made lower than the vertical position of the emitter tip. An aberration suppressing voltage Vsp is applied to the aberration suppressor electrodethat is a lower voltage than the potential of the emitterand controls equipotential lines near the emitter tipto make them parallel.