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:
Aug. 25, 2009
Filed:
Jul. 27, 2006
Susumu Tateyama, Hitachinaka, JP;
Yoshitaka Fujinuma, Hitachinaka, JP;
Tsutomu Nakagawa, Hitachinaka, JP;
Masayoshi Nakayama, Hitachinaka, JP;
Susumu Tateyama, Hitachinaka, JP;
Yoshitaka Fujinuma, Hitachinaka, JP;
Tsutomu Nakagawa, Hitachinaka, JP;
Masayoshi Nakayama, Hitachinaka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A developing device includes first-third sections, a developing roller, a partitioning wall and a toner concentration detector. The first-third sections have first-third screw augers respectively. The partitioning wall isolates the third section from the first section and the second section. A supply opening is formed in a portion of the partitioning wall opposing the first section. A toner concentration detector is disposed in the third section. The first screw auger conveys developer including toner to the developing roller, into the third section via the supply opening, and into the second section. The second screw auger conveys developer accommodated in the second section into the third section. The third screw auger conveys developer accommodated in the third section into the first section. Toner is replenished into the third section based on a detection result by the toner concentration detector.