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. 18, 2003
Filed:
Apr. 12, 2001
Other;
Abstract
The present invention provides a color cathode ray tube which can improve the focusing characteristics in a wide range of a phosphor screen by setting the total length of a focus electrode divided in multi-stages within a given value and properly selecting the mounting position and the sensitivity of an electrostatic quadrupole lens. A focus electrode G which constitutes a final-stage main lens includes a plurality of electrode members G - , G - , G - , G - which constitute an electrostatic quadrupole lens and a curvature-of-image-field correction lens, and assuming the distance from a surface of the focus electrode G which faces an anode G in an opposed manner to the final-stage main lens-side position of the electrostatic quadrupole lens as L , a relationship of 7.55≦L ≦11.5 is set.