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:
Mar. 23, 1999
Filed:
Aug. 25, 1997
Hitachi, Ltd., Tokyo, JP;
Hitachi Devices Co., Ltd., Mobara, JP;
Abstract
A color cathode ray tube includes a phosphor screen, a shadow mask closely spaced from the phosphor screen and electron gun. The electron gun has a plurality of electrodes including a plurality of cathodes for emitting a plurality of in-line electron beams, a control grid having a plurality of in-line apertures centered with the cathodes, an accelerating electrode, a cup-shaped focus electrode and a cup-shaped anode fixed on insulating supports. Each of the cup-shaped focus electrode and anode has at a first end face thereof opposing the other of the cup-shaped focus electrode and anode, a single opening surrounded by a rim formed by turning in the end face thereof toward an interior thereof. Each of said cup-shaped focus electrode and anode has a correction plate electrode therein, has a step on an inner wall thereof at a position set back from the first end face thereof to provide a first portion having an inside diameter larger on an open end side thereof opposite the first end face, than that of a second portion thereof on a side of the first end face. The correction plate electrode is pressed against the step and fixed to the cup-shaped electrode, or is fixed in the second portion of the smaller inside diameter.