Ricoh Company, Ltd.

Masayuki Kakimoto

Masato Kobayashi

Masayuki Ishii

Masanori Rimoto

Tohru Suganuma

Masahiro Kawamoto

Akio Matsui

Kohtaroh Ogino

Shohichi Sugimoto

Hiroaki Sugiyama

Hideyuki Ueda

Kohji Kubota

Shoji Watanabe

Kohta Wakimoto

Tomoyuki Yamada

Yuuichi Kohyama

Fumio Nishide

Kenkoh Degura

Hirofumi Yamanaka

Ikuo Tasaki

Yoshikatsu Matsuda

Mamoru Kawaguchi

Yoshiyuki Okegawa

A toner is provided which includes: a toner base particle including a binder resin; and an external additive including inorganic particles. A particle size distribution of primary particles of the inorganic particles has a plurality of peaks in the range of from 5 nm through 50 nm. The particle size distribution of the primary particles satisfies all of expressions (1) to (3) below:12&#x2003;&#x2003;(1);10&#x3c;(12)&#x2003;&#x2003;(2); and30&#x2264;{(21)&#xd7;100}&#x3c;100&#x2003;&#x2003;(3),

Toner, developer, toner stored unit, image forming apparatus, image forming method, and printed matter producing method

Disclosed is a milling and classifying apparatus, adapted to produce toner fine particles, comprising a collision mill, and an air classifier, wherein the collision mill comprises a jet nozzle room, a path, a collision plate, and a collision member mounted to a support of the collision plate at downstream of the collision plate, the air classifier comprises a dispersion room and a classification room, the classification room is disposed below the dispersion room, and a flow stabilizer is arranged at a central suction of the separator core to control swirl stream generated within the classification room so as to centrifuge the powder into coarse particles and fine particles by action of the swirl stream.

Milling and classifying apparatus, collision mill, air classifier, toner, and method for producing toner

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Shizuoka, Japan

Masayuki Kakimoto