Laminar flow guns for light valves

Details Laminar flow guns for light valves Laminar flow guns for light valves

1986-10-17

1988-02-09

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Plural concentrating, accelerating, and/or de-accelerating...

358 62, 313453, H01J 2946, H01J 2956

Patent

active

047243597

ABSTRACT:
A laminar flow electron gun (16) for use in a light valve of the Schlieren dark field type is disclosed. The gun uses three accelerating electrodes (111, 112 and 113) with critical axial spacing to beam diameter ratios to allow independent adjustment and/or modulation of beam current density at the imaged aperture while reducing criticality of electrode voltages on the second and third accelerating electrodes. The design permits, but does not require, the use of a separate control grid electrode (110). The first accelerating electrode (111) is closely spaced to the cathode (119) to provide a virtual cathode at, or about, the voltage level of that electrode that reduces the thermal beam spread normally encountered in conventional electron guns. Primary control of the narrow angle beam current is by adjustment of the beam current density impinging on the final aperture (121) in the gun. The interaction of negative and positive electron lenses within the gun retains laminar flow conditions to the final aperture over a wide range of beam current levels, assuring low beam spread in the output beam from the gun.

REFERENCES:
patent: 3151269 (1964-09-01), Vestal
patent: 3256460 (1966-06-01), Wendt
patent: 3409735 (1968-11-01), Campbell et al.
patent: 3740607 (1973-06-01), Silzars et al.
patent: 3881136 (1975-04-01), Scheele

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