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:
Oct. 26, 1982
Filed:
May. 01, 1981
Michael H Kalmanash, Fairfield, CT (US);
United Technologies Corporation, Hartford, CT (US);
Abstract
A color switch for a beam penetration CRT includes a return path through a pair of reverse biased diodes to recapture a substantial amount of the energy associated with changing the voltage on the anode of the CRT for a write period in a non-baseline color. A driver circuit, which includes the low voltage power supply, is connected through a switch to one end of the primary winding of a transformer. The primary winding is also connected through one of two diodes to each half of the low voltage power supply for the driver. By opening the switch at the end of a color write period in a non-baseline color, the rapid decrease in the current through the primary winding of the transformer to restore DC balance of the magnetizing current in the transformer core forms a reverse voltage which is returned to the low voltage power supply through the diodes. The baseline color is selected to be in an intermediate range so that the anode voltage level can be swung in either direction so that a random non-baseline color can be selected for a color write period.