Deflection system for light valve projectors of the schlieren da

Details Deflection system for light valve projectors of the schlieren da Deflection system for light valve projectors of the schlieren da

1986-08-26

1988-10-18

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

313427, 313439, 313117, 313111, 315391, 315395, 315 15, 358 62, H01J 2964, H01J 2974

Patent

active

047790245

ABSTRACT:
An improved electron deflection system for a light valve of the type used in Schlieren dark field projectors is disclosed. The deflection system eliminates one set (D box 25) of three sets of deflection electrodes used in such projectors. This is accomplished by modifying the d.c. voltages and a.c. voltages applied to the deflection electrodes. A quadrupole d.c. voltage is added to the first control box set of electrodes (61, 62) and a second quadrupole voltage of opposite sense is added to the focus deflection box set of electrodes (63, 65). This modifies the vertical and horizontal beam angles differentially and the vertical and horizontal beam trajectories differentially in a manner to compensate for the composite effects of spherical aberrations, deflection focusing aberrations, and the static starfish lens generated by the interaction of the square box electrode structure against the round drift ring assembly (21) of the deflection system.

REFERENCES:
patent: 3065295 (1962-11-01), Glenn, Jr.
patent: 3078338 (1963-02-01), Glenn, Jr.
patent: 3134852 (1964-05-01), Glenn, Jr. et al.
patent: 3385923 (1968-05-01), Vanderlaan et al.
patent: 3437746 (1969-04-01), Good et al.
patent: 3730992 (1973-05-01), True
patent: 3806636 (1974-04-01), True et al.

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