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:
Nov. 10, 1992
Filed:
May. 28, 1991
Taketoshi Shimona, Isesaki, JP;
Eiji Kamohara, Fukaya, JP;
Shigeru Sugawara, Fukaya, JP;
Jiro Shimokobe, Fukaya, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
In a electron gun assembly, three in-line electron beams are generated from three cathodes and are controlled and accelerated by a prefocusing electron lens, and each of the electron beams is converged by unipotential electron lens. In a horizontal plane, the electron beams are collimated by a quadruple lenses and are incident on a single and common large-diameter main electron lens. In a vertical plane, each of the electron beams is emerged as a divergent electron beam from the quadruple lens and each of the divergent electron beams is incident on the main electron lens. Thus, each of the electron beams are correctly focused on a screen and the three electron beams are correctly converged on a convergent point by the main electrode lens.