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:
Apr. 30, 2002
Filed:
Aug. 28, 2000
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A color cathode-ray tube having at least one trajectory correction device including a plurality of trajectory correction coils, and a current supply circuit for supplying current to these coils. The trajectory correction device functions to over-converge or under-converge a pair of side beams at a peripheral portion of the phosphor screen relative to a center of the phosphor screen. The trajectory correction device produces a magnetic field such that there is a position in the produced magnetic field where no force is exerted on the three electron beams. This position is separated from a plane including a tube axis, and a first direction or a second direction. In this color cathode-ray tube apparatus with this structure, no degradation occurs in focusing or distortion characteristics even where the trajectory correction device is provided, for example, in realizing a flat screen by using a press-formed shadow mask.