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:
Feb. 13, 1990
Filed:
Mar. 10, 1989
Applicant:
Inventors:
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03G / ; B21B / ; B60B / ; B41M / ;
U.S. Cl.
CPC ...
118651 ; 29132 ; 355259 ; 427145 ;
Abstract
A developing device including a developing roller which has a resilient support layer and a dielectric layer provided on the support layer and developing an electrostatic latent image formed on a photoconductive drum through the roller by using a single-component developer, i.e. toner. The variation of development characteristics ascribable to the developing roller is suppressed by providing a resilient material which constitutes the support layer with a resistance value less than a predetermined value that is mostly determined by a relationship between the resistance value and the developing time. Further, a method is described for producing a developing roller for the developing device.