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:
Sep. 04, 1984
Filed:
Oct. 23, 1981
Allen P Blacker, Hoffman Estates, IL (US);
Khem K Garewal, Hoffman Estates, IL (US);
Zenith Electronics Corporation, Glenview, IL (US);
Abstract
A high-resolution color television electron gun is disclosed for use in a high-brightness cathode ray tube having an unsegmented cathodoluminescent screen for producing a monochromatic image. The electron gun provides three horizontally oriented in-line beams lying in the deflection plane of the tube and converged into substantial coincidence on the screen. The diameters of the beams and hence resolution of the monochromatic image is inversely related to the magnitude of the beam currents. The gun includes associated cathode means and grid electrode means for forming each of the beams. A main focus lens for each of the beams includes at least a focusing electrode and an accelerating electrode for receiving a predetermined pattern of applied voltages for establishing beam-forming and accelerating electrostatic fields. The magnitude of the applied voltages are such that the beam currents are relatively low providing for small beam diameters and consequent high resolution. The brightness of the monochromatic image provided by the gun according to the invention is greater by approximately three times, without the loss of resolution, the brightness attained by a single-beam electron gun of equivalent beam current.