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:
Mar. 06, 1984
Filed:
Mar. 05, 1982
Applicant:
Inventors:
Assignee:
Hitachi Metals, Ltd., , JP;
Primary Examiner:
Int. Cl.
CPC ...
G03G / ;
U.S. Cl.
CPC ...
430122 ; 118657 ;
Abstract
A process for depositing magnetic toner material on electrostatic latent images formed on an image bearing surfaces includes the steps of conveying toner to the developing zone via a magnet roll having a shell and coaxial permanent magnet member rotating in the same directions. In the region of the developing zone, the toner is subjected to both an A.C. magnetic field and an applied A.C. electrical field so as to render the toner electroconductive. The A.C. electrical field has a peak voltage greater than the dark voltage of the latent image, but less than 3,200 volts, and a frequency greater than v/0.3 where v is the advancing speed of the image bearing surfaces in relation to the magnet roll.