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. 29, 2000
Filed:
Jun. 24, 1997
Yasunobu Amano, Tokyo, JP;
Sony Corporation, , JP;
Abstract
A focus electrode of an electron gun for color cathode ray tubes of the present invention is divided into at least two focus electrodes, three electron beam passage apertures are provided on each focus electrode, electron beam passage apertures disposed on the one end sides of at least one focus electrodes have different astigmatism respectively from electron beam passage apertures disposed on the other end sides, electron beam passage apertures disposed on both sides of the focus electrode have different astigmatism from electron beam passage apertures disposed on both sides facing each other of the adjacent focus electrodes, the electron beam passage apertures disposed at the center of the respective focus electrodes are shielded. The invention provides an in-line three beam type electron gun for color cathode ray tubes which is capable of equalizing the beam spot configuration of three electron beams on the right and left ends of the fluorescent screen.