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:
Nov. 12, 2002
Filed:
May. 30, 2001
Applicant:
Inventor:
Hisao Okada, Ibaraki, JP;
Assignee:
Hitachi Koki Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03G 1/509 ;
U.S. Cl.
CPC ...
G03G 1/509 ;
Abstract
In a developing roll, grooves of a length direction of a developing roll are formed on a surface of the developing roll on conditions that a ratio of a groove depth to a groove width is set to one or more and a ratio of a groove pitch to a groove width is set to two or more and a groove depth is set to three times or more a carrier particle size, and a magnetic pole of the inside of the developing roll is provided in a position of a doctor blade for regulating the amount of carriage of a developer roll, and further a magnetic force on the surface of the developing roll of the position of the doctor blade is set to 0.06 T or less.