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:
May. 01, 1990
Filed:
Apr. 12, 1989
Sony Corporation, Tokyo, JP;
Abstract
An electron gun arrangement for color cathode-ray tubes comprising three cathodes for emitting electron beams, for example, for red, green and blue, and a main electron lens comprising three front electron lenses corresponding to the cathodes, respectively, and a back electron lens common to all the cathodes. Each front electron lens is formed with an aperture smaller than that of the back electron lens and is mounted so as to meet Fraunhofer conditions so that aberration is reduced. Electron beam transmitting apertures are formed in the grids forming the front electron lenses, respectively, with the respective center axes thereof parallel to each other, which makes it easy to manufacture the electron gun arrangement and enables accurate machining during manufacturing.