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:
Feb. 27, 2001
Filed:
Jul. 16, 1998
Yasuyuki Ueda, Osaka, JP;
Matsushita Electronics Corporation, Osaka, JP;
Abstract
Four magnetic pieces are provided inside the cup-shaped portion of a shield cup. Correction magnetic field generating faces at the tips of the magnetic pieces are opposed to each other and sandwich an electron beam. Correction can be conducted according to the astigmatism amount of three electron beams because a correction magnetic field corresponding to the strength of a deflection magnetic field can be generated easily by leading the deflection magnetic field absorbed by the principal face portion of each magnetic piece to the correction magnetic field generating face. Thus, the difference in astigmatism amount among the electron beams caused by the deflection magnetic field can be corrected. Therefore, a color cathode ray tube apparatus that can display images with a high resolution over the whole screen surface can be provided.