System for tracing symbols on visual indicator with orthogonal sweep
Abstract
Abstract A LUMINOUS PENCIL WITH PHOTOELECTRIC PICKUP IS MANUALLY DISPLACED ACROSS A SCREEN OF A CATHODE-RAY TUBE, ILLUMINATED BY AN ORTHOGONALLY SWEPT ELECTRON BEAM, TO TRANSMIT POSITIONAL PULSES TO A FERRITE MEMORY WHERE THE INFORMATION IS STORED FOR FEEDBACK TO THE INPUT OF THE SAME TUBE WHEREBY THE ILLUMINATION IS BLACKED OUT AT THE LOCATIONS SCANNED BY THE PENCIL AND A DARK TRACE APPEARS ON THE SCREEN. SIMULTANEOUS OR DELAYED TRANSMISSION TO OTHER CATHODE-RAY TUBES WILL CAUSE THE SAME TRACE TO BECOME VISIBLE ON THEIR SCREENS. FOR COMPLETE ERASURE OF A TRACE, THE MEMORY MAY BE TEMPORARILY BLANKED? PARTIAL ERASURE MAY BE AFFECTED BY RETRACING A PORTION OF THE IMAGE AND INVERTING THE OUTPUT OF THE PICKUP TO PRODUCE A SELECTIVE BLANKING SIGNAL. USE OF A MULTICOLOR TUBE PERMITS SELECTIVE COLORING OF THE TRACE.
Inventors
- 👤 Felix Floret
- 👤 Georges Peronneau
Bibliographic Details
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