Ricoh Company, Ltd.

Chieko Yamazaki

Atsushi Yamamoto

Yoshihiro Mikuriya

Naohiro Toda

Tsuyoshi Nozaki

Takuya Kadota

Yoshimichi Ishikawa

Kazuoki Fuwa

Tomohiro Fukao

Tomoharu Miki

Takafumi Iwamoto

An electrophotographic photoreceptor including an electroconductive substrate, a photosensitive layer, and a cured protection layer, wherein the cured protection layer comprises a cured material of a tri- or more functional radical polymerizable compound and a filler exposed from the surface of the cured protection layer which comprises a bump along the surface of the filler, and wherein the cured protection layer has a thickness (T) larger than a diameter (2r) of the filler therein and the following relationships (a) is satisfied:(the number of the fillers present to a depth of/2 from a free surface of the cured protection layer/the total number of the fillers in the cured protection layer)&#xd7;100&#x2267;7%&#x2003;&#x2003;(a).

Electrophotographic photoreceptor, image forming apparatus and process cartridge for image forming apparatus

An electrostatic image developing toner including toner core particles each containing at least a first resin and a colorant, and fine resin particles formed of a second resin, wherein part of each of the fine resin particles is embedded in each of the toner core particles, and the remaining part of the fine resin particle is exposed on a surface of the toner core particle to form a protrusion, and wherein when a rate of the part of the fine resin particle to the fine resin particle is indicated by an embedment rate, an average of the embedment rates in the fine resin particles is 40% to 80%.

Toner, image forming apparatus, image forming method and process cartridge

Growing community of inventors

Shizuoka, Japan

Chieko Yamazaki