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. 06, 1999
Filed:
May. 27, 1997
Sony Corporation, Tokyo, JP;
Abstract
An electron gun without deviation of diameter between grids, having a good object point diameter shape, and having a high cut-off voltage, which is cheap and has high performance, and a cathode ray tube provided with the same. The electron gun is provided with a spacer of a columnar shape which has surfaces facing each other on its two end surfaces, a beam aperture penetrating the spacer between the end surfaces, and conductive films provided on the two end surfaces, in which at least the circumferential wall of the beam aperture is constituted by a high resistance conductive material, the conductive films being used to constitute the grids and the beam aperture being constituted as an aperture for an electron beam.