Device for continuous electrostatic reproduction of an optical i

Details Device for continuous electrostatic reproduction of an optical i Device for continuous electrostatic reproduction of an optical i

1975-05-27

1976-10-05

Eddleman, Alfred H.

Recorders

Magnetographic

178 66A, G03G 1504, G01D 1514

Patent

active

039848426

ABSTRACT:
Apparatus and method for continuously converting an optical image into an electrostatic image. A vacuum tube device has a source of electrons and associated elements for propagating electronic charge toward an array of conductors coupling an interior surface of the vacuum tube device with an exterior surface of the device. The array of conductors has an extent substantially greater in a first dimension as compared to a second dimension. A photosensitive electrode, interposed between the electron source and the array of conductors modulates the passage of electrons from the source to the array. The modulation results from the presence of stored electronic charge on the electrode, the stored charge of local portion of electrode controlling the passage of electrons through apertures associated with the local portion of the electrode. The charge distribution on the photosensitive electrode can be determined by an optical image, applied to the electrode under appropriate conditions. Electron optics, associated with the vacuum tube device, focus electrons passing through the modulating electrode onto the conductor array. By focusing electrons passing through successive selected regions of the electrode on the conductor array, the charge distribution of the electrode can be scanned by the electrons passing therethrough. The array electrostatic charge, resulting from the deposition of electrons on the conductor array, can be continuously transferred to a dielectric material passing by the external surface of the conductor array. By synchronizing the passage of the dielectric material with the selected regions of the electrode, the stored electrical charge and therefore the optical image can determine an electrostatic image transferred to the dielectric material. The electrostatic image in the dielectric material can be processed and fixed by electrostatograhic techniques. Methods for locally altering the charge distribution are described.

REFERENCES:
patent: 2986442 (1961-05-01), Broding
patent: 3368106 (1968-02-01), Berthold
patent: 3419888 (1968-12-01), Levy
patent: 3495267 (1970-02-01), Brodie

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