Dynamic focus for a cathode ray tube

Details Dynamic focus for a cathode ray tube Dynamic focus for a cathode ray tube

1978-05-22

1980-07-22

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315 31TV, H01J 2958

Patent

active

042141885

ABSTRACT:
Dynamic focus voltages for a CRT are obtained by utilizing the combined parabolic conversion wave shapes for control of the focusing electrode to provide sharp focus at all points in the raster. A current source is coupled to the focus divider chain and the conversion wave shape controls the current in the divider chain by controlling the resistance in a transistor. No high voltage capacitors are required since the dynamic voltages are coupled into the chain near the low voltage end.

REFERENCES:
patent: 2880358 (1959-03-01), Parker
patent: 3146373 (1964-08-01), Janssen
patent: 3412281 (1968-11-01), Richards, Jr. et al.
patent: 4140948 (1979-02-01), Ikebata

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