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:
May. 24, 2005
Filed:
Jan. 31, 2003
Yuji Suzuki, Tokyo, JP;
Naohito Shimota, Shizuoka, JP;
Bing Shu, Shizuoka, JP;
Koji Suzuki, Kanagawa, JP;
Akihiro Itoh, Miyagi, JP;
Yuji Suzuki, Tokyo, JP;
Naohito Shimota, Shizuoka, JP;
Bing Shu, Shizuoka, JP;
Koji Suzuki, Kanagawa, JP;
Akihiro Itoh, Miyagi, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
In a developing device having a developing zone where an image carrier and a developer carrier face each other, the developer carrier carrying a developer thereon moves at a linear velocity of 150 mm/sec or above, but below 500 mm/sec. The amount of the developer conveyed to the developing zone by the developer carrier is between 65 mg/cmand 95 mg/cm. A magnetic flux generated on the developer carrier in the developing zone by a magnetic pole has a flux density having an attenuation ratio of 40% in the direction normal to the developer carrier. The flux density in the direction normal to the developer carrier, as measured on the surface of the developer carrier, is between 100 mT and 200 mT. Magnetic grains, which constitute the developer together with toner grains, have a saturation magnetization value of 40×10×4 πWb·m/kg or above, but below 50×10×4 πWb·m/kg.