System for coupling the focus current to the focus voltage of a

Details System for coupling the focus current to the focus voltage of a System for coupling the focus current to the focus voltage of a

1979-11-23

1982-11-30

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315 31R, H01J 2958

Patent

active

043617840

ABSTRACT:
A focussing system for a camera tube in which the nominal magnitude of the focus tube voltage and focus coil current are predetermined and in which incremental changes in the focus voltage result in square-root proportional incremental changes in the focus current. Alternatively, incremental changes in focus current result in changes in the focus voltage which are proportional to the square of the current changes by which they are caused.

REFERENCES:
patent: 3355621 (1967-11-01), Cosgrove
patent: 4198592 (1980-04-01), Miyoshi et al.

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