DEVICE FORMING SPIRAL SCAN FOR TV COORDINATORS Russian patent published in 2002 - IPC

FIELD: television equipment. SUBSTANCE: invention is related to devices forming rectangular spiral scan. Technical result of invention lies in generation of search raster in TV coordinators intended for search, detection and determination of coordinates of point objects located in field of vision of camera tube. Proposed device ensures independence of maximum raster of cathode-ray tube of changes of supply voltage as circuit controls not number of turns of scan but voltage values across outputs of generators of amplitude-modulated scan voltage of channels X and Y corresponding to position of scanning aperture of camera tube on edges of raster. Device makes it possible to make short-time stop of scan on any turn and in any phase with its subsequent cut-off or further scanning from point of stop as well as starting of scanning within field of vision with start in point having any coordinates. EFFECT: enhanced functional reliability of device. 3 dwg