Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1978-12-01
1982-12-07
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2972
Patent
active
043629733
ABSTRACT:
An aesthetically pleasing Lissajous figure is derived from a single signal source which feeds a common signal to both the horizontal and vertical deflection circuits of a cathode ray tube. Between the signal source and one or the other of said deflection circuits, a time delay is utilized to retard the transit of the signal to that deflection circuit. With a fixed frequency source, the Lissajous figure presented will be an ellipse whose eccentricity will be determined by the frequency of the signal output by said source. Where the signal source provides an output which randomly varies in frequency, the Lissajous figures presented will be reentrant in nature and of a character determined by the rate of change of frequency from said source and the magnitude of the time delay inserted in the selected deflection circuit. The invention lends itself to use with single or multiple gun CRT's and in either case may be used with monochromatic or polychromatic phosphorescent screens. When utilized with the three-color CRT employed by today's color television sets, three Lissajous figures may be produced, each in their own purety of hue.
REFERENCES:
patent: 2537104 (1951-01-01), Taylor
patent: 3659142 (1972-04-01), Phillips
Inversion Layer Probe, IBM Technical Disclosure Bulletin, vol. 13, No. 5, Oct. 1970.
J. Rider et al., Encyclopedia on Cathode Ray Oscilloscopes and Their Uses, J. F. Rider Publisher, N.Y.C., 1950, pp. 437-444.
Blum Theodore M.
Duffy James F.
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