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:
Jun. 15, 1999
Filed:
Jul. 11, 1996
Applicant:
Inventor:
Saijiro Endo, Tokyo, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03G / ; G03G / ;
U.S. Cl.
CPC ...
399104 ; 399274 ; 399282 ;
Abstract
A developing device includes a developing sleeve for carrying a magnetic developer, a regulating sleeve for regulating the thickness of the layer of the developer on the developing sleeve, magnets for generating a magnetic field in a layer-thickness regulating portion by the regulating sleeve, and magnetic members provided so as to have a small gap between the circumferences of the developing sleeve and the regulating sleeve. Leakage of the developer from end portions is prevented by forming a magnetic seal by way of a magnetic field between each of the magnetic members, and between the regulating sleeve and the developing sleeve.