Electron beam control system

Details Electron beam control system Electron beam control system

1984-06-29

1986-05-06

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315370, H01J 2958

Patent

active

045874646

ABSTRACT:
A high speed focus control circuit for an electron beam projection system. The circuit includes a conventional digital to analog converter, comprising a register for storing an n-bit digital value, and n current drivers, each of which provides a current which is proportional to the associated bit weighted value. Rather than summing the currents from all n current drivers and driving a single focus coil, each current driver is connected to one of n individual coils, wound on a common bobbin. This reduces circuit capacitance and permits higher switching speed.

REFERENCES:
patent: 3409799 (1968-11-01), Kurzweil, Jr. et al.
patent: 3686527 (1972-08-01), Gabor
patent: 4132908 (1979-01-01), Hughes

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