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:
Jan. 26, 1999
Filed:
Aug. 16, 1996
Applicant:
Inventor:
Hisakazu Yamane, Nagaokakyo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
313414 ; 313449 ; 315 15 ; 315382 ;
Abstract
An electron gun of a multi-stage convergence type includes a plurality of focusing electrodes, wherein a quadrupole lens nearest to a cathode has a diverging function in the horizontal scanning direction and a converging function in the vertical scanning direction, and a quadrupole lens in the next stage has a converging function in the horizontal scanning direction and a diverging function in the vertical scanning direction. In this structure, even when a voltage synchronized with a deflection current is superposed on a constant focus voltage, applied to the focusing electrode, the operation of the quadrupole lenses is not influenced significantly.