The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 23, 1979
Filed:
Mar. 01, 1978
Olympus Optical Company Limited, Tokyo, JP;
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.