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:
Dec. 10, 2002
Filed:
Jul. 20, 2001
Souichi Sakurai, Yokohama, JP;
Nobuyuki Koganezawa, Chiba, JP;
Nobutaka Okuyama, Yokohama, JP;
Takeshi Kaneki, Mobara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Horizontal line misconvergences produced at screen upper and lower portions, among rasters displayed by side electron beams are corrected without producing degradation in vertical deflection sensitivity so much and changing horizontal trapezoidal distortion. In a deflection yoke provided with a top-and-bottom pair of saddle-type horizontal deflection coils and a right-and-left pair of saddle-type deflection coils and mounted to and used in a color cathode ray tube having an in-line arranged electron gun, a pair of sub-cores is provided from side to side or above and below on the electron gun side of the deflection yoke. At least one pair of correction coils is wound around each of the pair of sub-cores. The one pair of correction coils is connected in series with vertical deflection coils in such a manner that respective magnetic poles produced from the one pair of correction coils become identical to the pole of a cathode ray tube axis, and a variable resistor is connected in parallel with the one pair of correction coils to change a current that flows through the one pair of correction coils.