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:
Jun. 18, 1991
Filed:
Nov. 03, 1989
Applicant:
Inventor:
Wan-jae Son, Cheonan, KR;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
313414 ; 313449 ;
Abstract
A dynamic focusing electron gun for high resolution includes a triode part and a main lens. The main lens includes a first focusing electrode disposed proximate the triode part, a second focusing electrode disposed proximate an anode electrode, a static potential electrode and a dynamic potential electrode disposed between the first and second focusing electrodes to form a dynamic quadrupole lens. The dynamic focusing electron gun produces a high resolution image with a small radius beam spot with low astigmatism, low spherical aberration, and good voltage endurance characteristics.