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:
Nov. 17, 1992
Filed:
Dec. 18, 1991
Wan-jae Son, Cheonan, KR;
Sang-jin Park, Kyeongsangnam, KR;
Samsung Electron Devices Co., Ltd., Kyunggi, KR;
Abstract
In an electron gun for cathode ray tubes in which the second of three focusing electrodes is divided into first, second, and third auxiliary electrodes, applying a first dynamic voltage synchronous with vertical and horizontal deflection signals to the first and third auxiliary electrodes, a second dynamic voltage synchronous with the deflection signals to the second auxiliary electrode, and a static focusing voltage higher than the maximum of the first and second dynamic voltages to the first and third focusing electrodes. The electron gun uses two dynamic focusing voltages in a low voltage driving method for low dynamic focusing voltages, thereby greatly reducing the possibility of an arc discharge between electrodes and compensating for astigmatism of the electron beam due to the non-uniform magnetic field of the deflection yoke. A sharp picture is achieved by improving the focusing of the electron beam.