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:
Jul. 14, 1992
Filed:
Aug. 08, 1990
David H Staelin, Wellesley, MA (US);
Massachusetts Institute of Technology, Cambridge, MA (US);
Abstract
A cathode ray tube apparatus uses a ribbon electron beam to illuminate one line of information at a time on the display surface of the tube. The resulting increase in scanning speed allows for a reduced beam current density and corresponding reduction in electrostatic spreading. The beam is focusable to a smaller spot which allows enhanced image resolution. Velocity filters enhance resolution in the plane of the ribbon beam. A linear modulation assembly allows the ribbon beam to be modulated prior to deflection, removing the need for a full modulation grid. Thin septa are provided to support the tube against compressive external forces. The septa are tapered near the display surface where septum electrodes draw electrons of the beam toward the septa near the display surface to prevent image discontinuity. Rapidly-varying high voltages are provided by an electron gun directed toward receiving anodes which absorb electron energy and transfer resulting voltages to storage circuits which service high voltage electrodes.