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:
Aug. 25, 1992
Filed:
Nov. 06, 1990
Koichi Sugahara, Sakai, JP;
Osamu Konosu, Nagaokakyo, JP;
Hiroshi Suzuki, Nagaokakyo, JP;
Noboru Tominaga, Takatsuki, JP;
Matsushita Electronics Corporation, Osaka, JP;
Abstract
An in-line type electron gun used in a color cathode ray tube apparatus, the electron gun comprising a focusing grid, a final accelerating grid adjacent to the focusing grid, these grids having elongated cylindrical apertures having their majors extending horizontally, a field correction metal plate located in each grid along the elongated aperture, the field correction metal plate having three apertures produced in an in-line arrangement, wherein the central aperture is elongated with a major extending vertically, and the two apertures on each side are circular, the horizontal diameter L.sub.s and the vertical diameter .phi..sub.v having a ratio .phi..sub.v /L.sub.s of 0.49 to 0.6.