Split drift ring for focus deflection in light valves

Details Split drift ring for focus deflection in light valves Split drift ring for focus deflection in light valves

1986-07-08

1987-12-29

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

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

358233, 358 62, 350361, H01J 2946

Patent

active

047163399

ABSTRACT:
A light valve of the Schlieren dark field type is provided with a vacuum envelope containing an electron gun, a focus and deflection assembly and a rotating disk coated with a light modulating fluid on which an electron beam from the electron gun is scanned in a raster pattern. The rotating disk has a transparent electrode which serves as as electron beam landing electrode. Between the focus and deflection assembly and the rotating disk is a drift ring assembly comprising at least two axially separated segments. The drift ring segment closest to the focus and deflection assembly is operated at a voltage to generate, in combination with the focus and deflection assembly, an electrostatic lens which corrects distortions that originate from deflection fields applied to the focus and deflection assembly. The other drift ring segment is operated at a voltage different from that of the first drift ring segment such that the two drift rings interact to generate an electrostatic lens that controls the focus of the electron beam. The second drift ring and the electrode on the rotating disk interact to generate a third electrostatic lens to further control beam size to an essentially uniform value by further shaping of the locus of deflected field focus to closely approximate the planar surface of the control layer.

REFERENCES:
patent: 3345462 (1967-10-01), Good et al.
patent: 3538249 (1970-11-01), Graser et al.
patent: 3746911 (1973-07-01), Nathanson et al.
patent: 4065644 (1977-12-01), Shinosky, Jr.
patent: 4110791 (1978-08-01), Rosendahl
patent: 4533216 (1985-08-01), Orser et al.
patent: 4543508 (1985-09-01), Saito

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