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. 12, 1983
Filed:
May. 21, 1981
Edgar M Smith, Millersville, PA (US);
RCA Corporation, New York, NY (US);
Abstract
A method of aging a cathode of an evacuated cathode-ray tube having an electron gun including a heater, a cathode, a control electrode, a screen electrode and a focus electrode is proposed. The cathode and the focus electrode are interconnected. A first potential is applied to the heater while a second potential is applied to the cathode and focus electrode. At the same time, a third potential, more positive than the second potential, is applied to the control electrode. A fourth potential is applied to the screen electrode. A change in the fourth potential is sensed and the sensed change in the fourth potential is used to generate a control signal to vary the first potential to the heater. The aging process is terminated when the control signal causes a predetermined value of the first potential to be achieved. A structure to provide at least some of the above-indicated potentials as well as to sense the change in one of the potentials and to generate the control signal is also disclosed.