Dynamic focus correction circuit

Details Dynamic focus correction circuit Dynamic focus correction circuit

1993-08-17

1995-10-03

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

G09G 104, H01J 2958

Patent

active

054554926

ABSTRACT:
Dynamic focus circuits for generating a dynamic focus signal for focusing an electron beam on a CRT, the signal being proportional to a function of the vertical deflection Y and horizontal deflection X of the beam according to X.sup.2 +Y.sup.2 +X.sup.2 f(Y) or X.sup.2 +Y.sup.2 +Y.sup.2 f(X), where f(Y) or f(X) is a positive symmetric function. The resultant dynamic focus signal has increased magnitude as the beam moves away from the center of the screen, thus providing proper focusing at the corners of the screen as well as at the center and sides of the screen.

REFERENCES:
patent: 3422305 (1969-01-01), Infante
patent: 3501669 (1970-03-01), Henderson
patent: 3806758 (1974-04-01), Lundqvist
patent: 3961223 (1976-06-01), Ray et al.
patent: 4258298 (1981-03-01), Hilburn et al.
patent: 4499457 (1985-02-01), Hintze
patent: 4633144 (1986-12-01), McKibben
patent: 5039923 (1991-08-01), Ogino et al.

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