Sharp Kabushiki Kaisha Corporation

Tadanori Kano

Hiroki Maeda

Keiichi Kikawa

Yoritaka Tsubaki

Osamu Wada

Takeshi Katoh

Yuya Kondo

Shoji Nakai

Takao Yamada

The toner includes an external additive adhering to the surface of a toner particle. The external additive contains fine powder in which the surface of a core derived by addition of silica to strontium titanate is hydrophobized with a silane compound, and silica.

Toner and two-component developer

Provided is a toner characterized by including at least a negatively-charged toner master particle, and an external additive externally added onto the surface of the toner master particle, wherein the external additive includes a fine powder and a small particle size silica having an average first particle diameter smaller than that of the fine powder, and wherein the fine powder is a composition containing at least aluminum hydroxide and silica and has a surface treated with silane.

Toner and manufacturing method thereof and developer containing the same

A toner contains at least a crystalline polyester resin and an amorphous linear polyester resin that uses diethylene glycol as an alcohol component, and a monoester wax and a montan ester wax as release agent components, wherein 6&#x2264;&#x3b1;&#x2264;8 and 14&#x2264;mw/&#x3b1;&#x3c;30 are satisfied, where &#x3b1; represents an amount of the crystalline polyester resin added relative to 100 parts by weight of the amorphous linear polyester resin and mw represents an amount of the montan ester wax added.

Toner, two-component developer, and method for producing toner

A developing device includes a first toner and a second toner that have different hues, an image carrier, a charging unit that charges the image carrier, and a potential controller that controls a potential of the charging unit. A first developing characteristic of the first toner and a second developing characteristic of the second toner have different slopes and intersect each other.

Developing device and image forming apparatus

A developing device includes a magnet roller, a developing sleeve that revolves in a predetermined direction of revolution around the magnet roller, a developer tank having an opening that forms a development region by opening a part of a surface of the developing sleeve in a circumferential direction, a regulating member that regulates a layer thickness of a developer on the surface of the developing sleeve, and a toner residue reduction member that reduces a residue of a toner adhering directly to the surface of the developing sleeve.

Growing community of inventors

Sakai, Japan

Tadanori Kano