Apparatus with two vacuum chambers for electrophotography produc

Recorders – Electric recording – Electrochemical

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313420, G03G 15044

Patent

active

041046471

ABSTRACT:
This invention relates to the novel system of electrophotography. The image of examined object is converted in a novel vacuum tube into a beam of electrons. The beam of electrons is converted next into an electrical or light pattern and is stored on a movable sheet of dielectric material which travels through said vacuum tube. Means are provided for introducing said sheet or tape of dielectric material into said vacuum tube and for transporting it after the exposure to the outside of said vacuum tube. It was found that continuous introduction of a movable sheet of said dielectric material into the vacuum tube causes an irreparable damage to the photocathode of said tube. This problem was solved by the use of a membrane which transmits said beam of electrons and which separates effectively the vacuum compartment of said tube in which the photocathode is located from the rest of said tube.

REFERENCES:
patent: 2839602 (1958-06-01), Fries
patent: 3188650 (1965-06-01), Schroter
patent: 3234561 (1966-02-01), Stone
patent: 3319318 (1967-05-01), Taimuty
patent: 3447021 (1969-05-01), Engel
patent: 3504371 (1970-03-01), Reed, Jr.
patent: 3611005 (1971-10-01), Uno
patent: 3611418 (1971-10-01), Uno
patent: 4005438 (1977-01-01), Meltzer

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