Recorders – Printing – dotting – or punching marker – Ink transfer support or moving means
Patent
1975-05-27
1976-11-23
Lucas, Jay P.
Recorders
Printing, dotting, or punching marker
Ink transfer support or moving means
346158, G03G 504, G03G 502
Patent
active
039940004
ABSTRACT:
Apparatus and method for converting an optical image into an electrostatic image replica. A vacuum tube device includes a source of electrons for propagating electrons toward an array of conductors coupling an interior surface of the vacuum tube device with an exterior surface. The accumulation of electrons on the conductor array produces an electrostatic image. The electrostatic image is determined by modulating a diffuse beam of electrons by means of the charge stored on a control grid. The charge stored on the control grid is established by secondary emission of electrons from an insulating material associated with the control grid. The electrons producing the secondary emission from the control grid originate from a photoemissive cathode are produced by the photoemissive cathode in response to an optical image applied to the cathode. The optical image applied to the photoemissive cathode is the image for which an electrostatic replica is desired.
The photo-emissive cathode and the control grid are arranged so that an electron from a region of the photoemissive electrode impinges on an associated region of the control grid. By varying the accelerating potentials between the photo-emissive cathode and the control grid, thereby determining the ratio of emitted electrons to impinging electrons, a negative or a positive charge can be placed on the control grid by electrons from the photo-emissive cathode. Thus, either a positive electrostatic image master or a negative electrostatic image master of the optical image can be stored on the control grid in response to application of the optical image to the photo-emissive cathode.
REFERENCES:
patent: 3368106 (1968-02-01), Berthold
patent: 3419888 (1968-12-01), Levy
patent: 3495267 (1970-02-01), Brodie
patent: 3787876 (1974-01-01), Pressman
IBM Tech. Disc. Bull., vol.15, No. 2, p. 575; 7/72, Output Control for Ionic Print Head, Re McCurry & C. A. Speicher.
Meltzer David W.
Trainor John W.
Lucas Jay P.
Xerox Corporation
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