Ricoh Company, Ltd.

Kazuyuki Yazaki

Yasuaki Iwamoto

Hiroaki Matsuda

Hiroshi Nakai

Hiroto Higuchi

Mitsuo Aoki

Fumihiro Sasaki

Naohito Shimota

Nobuyasu Makino

Ryoichi Ito

Mitsuyoshi Izu

Tomotsugu Miyamoto

Koji Suzuki

Masahide Yamashita

Tadashi Kasai

Yutaka Takahashi

Shinichiro Yagi

Akihiro Itoh

Maiko Kondo

Kumi Hasegawa

Bing Shu

Takayuki Koike

Yoshihiro Suguro

Akemi Sugiyama

Hiroyuki Yoshikawa

An image formation method includes the steps of charging the surface of an electrophotographic photoconductor, exposing the charged photoconductor to a light image to form a latent electrostatic image on the photoconductor, developing the latent electrostatic image using a two-component developer containing a toner and a carrier to obtain a toner image, and transferring the toner image to an image receiving material directly or via an intermediate transfer member, with the photoconductor showing a surface friction coefficient of 0.40 or less, and the toner having toner particles with an average circularity of 0.930 or more.

Electrographic image formation method

A toner for a two-component developer comprising the toner and carrier particles, the developer being used for an oilless fixing-type image forming apparatus comprising a developer carrier rotatable at a linear speed of 360-1,680 mm/sec, and a developer adjusting member extending in a lateral direction parallel to the rotational axis of the developer carrier and disposed adjacent to the developer carrier to define a gap therebetween of 0.3-1.0 mm, said image forming apparatus being operated so that the amount of the developer conveyed by the developer carrier and passing through the gap per 1 second is 5.0-25.0 g per 1 cm of the lateral width of the gap, the toner comprising a wax dispersed therein and the toner having a coefficient of dynamic friction in the range of 0.18-0.45.

Toner for two-component developer, image forming method and device for developing electrostatic latent image

A two component developer comprising a magnetic toner containing a binder resin and a magnetic particle, and a magnetic carrier containing a magnetic particle, wherein the magnetic toner has an average particle diameter of 4.0 to 10.0 &mgr;m, and contains 5 to 80 No. % of toner particles having particle diameter of 5 &mgr;m or less, and exhibits magnetization of 10 to 25 emu/g under magnetic field of 5 kiloersteds.

Two-component developer, image forming apparatus, and image forming method

A two-step process for the production of a toner for developing electrostatic images, including a first pulverizing step wherein a toner composition containing a binder and a coloring agent is pulverized to obtain preliminarily pulverized particles having a weight average particle diameter of 20-100 &mgr;m and containing no more than 50% by weight of particles having roundness of 0.90 or less, and a second pulverizing step wherein the preliminarily pulverized particles are finely pulverized to obtain finely pulverized particles having a weight average particle diameter of 5-13 &mgr;m and containing no more than 30% by weight of particles having roundness of 0.90 or less and no more than 15%, based on the total number of particles of the finely pulverized particles, of particles having a particle diameter of 5 &mgr;m or less.

Process for the production of toner for developing electrostatic image

Method of producing toner for developing latent electrostatic images

Growing community of inventors

Shizuoka, Japan

Kazuyuki Yazaki