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:
Apr. 13, 2004
Filed:
Nov. 24, 2000
Junichi Kimiya, Kumagaya, JP;
Shunji Ookubo, Kumagaya, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
In an electron gun assembly, its main convergence lens is composed of a focus electrode to which a focus voltage is applied, an anode electrode to which a high anode voltage is applied, and an intermediate electrode which is provided between the focus and anode electrodes and to which a high intermediate potential higher than the focus voltage and lower than the anode voltage is applied. The anode and intermediate electrodes are each a cylindrical unit long in the in-line direction. In the direction crossing at right angles with the in-line direction of the cylindrical units, the diameter of the opening in the anode electrode is set smaller than that of the opening in the intermediate electrode, thereby forming a multiple pole lens into a main electron lens of large aperture.