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:
Sep. 12, 1989
Filed:
Apr. 18, 1988
Masumi Asanae, Kumagaya, JP;
Toshio Kumakura, Omiya, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
A reversal development method comprising the steps of forming a latent electrostatic image on the surface of an image-carrying member having predetermined charging characteristics; supplying a developer to a non-magnetic, conductive sleeve containing a magnetic field-generating means and positioned opposite to the image-carrying member, the developer comprising a magnetic toner consisting essentially of a resin and magnetic powder and adapted to be charged with the opposite polarity to that of the latent electrostatic image; conveying the developer onto the image-carrying member surface by relative rotation of the sleeve to the magnetic field-generating means; and applying DC voltage of the same polarity as that of the latent electrostatic image to the sleeve so that the magnetic toner is attracted to the nonimage areas of the latent electrostatic image. The present invention can provide high-quality images with high optical density and resolution substantially without suffering from dispersed toner dust adhesion.