Ion modulator having bias electrode for regulating control field

Details Ion modulator having bias electrode for regulating control field Ion modulator having bias electrode for regulating control field

1975-03-25

1978-05-30

Welsh, John D.

Gas separation: apparatus

Magnetic separating means

96 15N, 355 3SC, G03G 1300

Patent

active

040921603

ABSTRACT:
An ion modulator having a bias electrode is capable of producing copies in which the contrast and background are controllable. Such modulator functions in a process which utilizes an adjustable charge density applied to set up uniform fringing fields of the desired magnitude which block ions directed towards background (light) areas. Funneling fields are set up in image (dark) areas in opposition to the original fringing fields by simultaneous imaging and ion projection, decreasing the effect of such fringing fields and permitting ions to pass through the modulator in image areas.

REFERENCES:
patent: 3582206 (1971-06-01), Burdige
patent: 3680954 (1965-09-01), Frank
patent: 3797926 (1974-03-01), Fotland et al.
patent: 3839027 (1974-10-01), Pressman
patent: 3880513 (1975-04-01), Fotland et al.
patent: 3881921 (1975-05-01), Frank

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