Electrophotographic apparatus

Details Electrophotographic apparatus Electrophotographic apparatus

1978-03-01

1979-01-23

Moses, Richard L.

Photocopying

Including fiber optics

G03G 1500

Patent

active

041358112

ABSTRACT:
An electrophotographic apparatus comprises a photosensitive screen drum of a radius r.sub.1 having a number of apertures formed therein and rotating through a printing or charging area having a width W at a constant peripheral velocity v.sub.1, a record medium such as a charge transferring drum of a radius r.sub.d (r.sub.2 = r.sub.1) arranged opposite to the screen drum with a distance d at the printing area and rotating through the printing area at a constant peripheral velocity v.sub.2, means for forming on the screen drum an electrostatic latent image of a document to be copied, and means for generating a corona ion stream passing in the printing area through the apertures of the screen drum, whereby the corona ion stream is modulated with an electric field formed in or near the apertures of the screen drum so as to form on the transferring drum a charge image corresponding to the latent image on the screen drum. The screen drum and transferring drum are rotated at a velocity ratio k = v.sub.2 /v.sub.1 which satisfies the following equation. ##EQU1## When the record medium is a copy paper, it is fed through the printing area along an arcuate passage having the radius r.sub.2 at the constant peripheral velocity v.sub.2.

REFERENCES:
patent: 3811765 (1974-05-01), Blake
patent: 4040731 (1977-08-01), Nishikawa
patent: 4046466 (1977-09-01), Ando et al.

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