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:
Jul. 18, 1995
Filed:
Jan. 26, 1994
Masaharu Iwai, Mooka, JP;
Yasushi Kakehashi, Mooka, JP;
Kanegafuchi Kagaku Kogyo Kabushiki Kaisha, Osaka, JP;
Abstract
A developing cylinder used in an electrophotographic developing device is improved in the efficiency of separation of a developer on its surface. A magnetic working force functioning to separate the developer from a sleeve surface is designed on the basis of a magnetic attraction force which results from a vector composite force consisting of a radial magnetic flux density and a tangential magnetic flux density on the sleeve surface and actually controls the behavior of the developer. The magnetic working force acting on a separation zone of weak magnetic flux density is made to act as a magnetic repulsion force functioning to separate the developer from the sleeve surface. The magnetic working force acting on a given area inclusive of a spot proximate to a photoconductor in a development zone is made to act as the magnetic repulsion force functioning to separate the developer from the sleeve surface. A magnet having a weak magnetic flux density pole is disposed in a developing zone and two strong magnetic flux density poles are disposed adjacent the weak magnetic flux density pole.