Ricoh Company, Ltd.

Kohichi Katoh

Koji Suzuki

Masami Tomita

Hiroshi Nakai

Kazumi Suzuki

Hideki Kosugi

Shinichi Kuramoto

Ichiro Kadota

Kei Yasutomi

Jun Yura

Naoki Iwata

Shigekazu Enoki

Hirokatsu Suzuki

Motoi Orihara

Tomoe Hagiwara

An image forming apparatus includes a pseudo half tone processing unit that performs a pseudo half tone process on input image data to generate output image data. An exposure unit executes light modulation of a plurality of light emitting sources based on the output image data. The exposure unit performs writing in such a way that different numbers of light emitting sources are used when writing a character/line image and a picture image or a graphics image. The pseudo half tone processing unit performs pseudo half tone processes with different resolutions on a character/line image and a picture image or a graphics image based on the numbers of the light emitting sources to be used for the writing by the exposure unit.

Image forming apparatus and image forming method using pseudo half tone processing with different resolutions

A toner for developing an electrostatic image to a visible toner image includes an amide-bonding-containing polymeric material, a releasing material, and a coloring agent, with the toner, when fused, having no interfaces between the toner particles thereof.

Toner for development of electrostatic images

A toner comprising a binder resin and a coloring agent, with an aggregation degree of 5 to 60%, and an absolute value of Q/M measured by the suction method of 2 to 30 .mu.C/g for use in (1) an image formation method in which electric charges are selectively held on the surface of a development roller to form a number of closed micro fields near the surface of the development roller, a non-magnetic one-component type developer comprising toner, with addition of an auxiliary agent thereto when necessary, is supplied onto the development roller, the developer is held on the surface of the development roller by the micro fields, and latent electrostatic images are developed to visible toner images, and (2) an image formation method in which the surface of a developer-bearing member having a chargeable and photoconductive surface is charged, the charged surface is selectively exposed to light for form a number of micro fields near the developer-bearing member, a non-magnetic one-component type developer comprising toner, to which auxiliary agents may be added when necessary, is supplied onto the development roller, the developer is held on the surface of the development roller by the micro fields, and latent electrostatic images are developed to visible images by the developer.

Toner and method of developing

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Kanagawa, Japan

Kohichi Katoh