Dynamic focus adjusting voltage generating circuit

Details Dynamic focus adjusting voltage generating circuit Dynamic focus adjusting voltage generating circuit

1989-11-15

1991-08-27

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2958

Patent

active

050436384

ABSTRACT:
A dynamic focus adjusting voltage generating circuit for generating a dynamic focus adjusting voltage to be applied to a CRT for displaying images. The circuit includes a horizontal output circuit for supplying a sawtooth wave current to the horizontal deflection coil of the CRT, and a series circuit connected in parallel with the terminals of the horizontal output circuit and consisting of a capacitor and an inductance coil connected in series with each other. An electric potential developed at a node between the capacitance and the inductance coil is used as the dynamic focus adjusting voltage.

REFERENCES:
patent: 4460851 (1984-07-01), Bistline et al.
patent: 4587465 (1986-05-01), Truskalo
patent: 4644230 (1987-02-01), Federle

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