Sharp Kabushiki Kaisha Corporation

Akio Matsumoto

Hiroshi Ishii

Satoshi Ogawa

Hisashi Yoshimura

Kiyoshi Toizumi

Yoshiaki Akazawa

Hirokazu Nakamura

Hiroshi Onda

Masahiko Kubo

Toshihisa Ishida

Tohru Nishikawa

Tadayuki Sawai

Tomoko Toizumi

Masaki Matsushita

Naozumi Ueno

Kouji Kida

Takashi Gotoh

Masao Suzuki

Provided is a toner not undergoing the effect of change of temperature and humidity, with high charging stability and having good fixing property and releasability. This is an electrophotographic toner containing at least a binder resin, a colorant, a charge controller and a wax in which the binder resin comprises a polyester resin having an aromatic alcohol ingredient, the charge controller comprises an organic bentonite and the wax comprises a non-polar paraffin wax.

Electrophotographic toner

An image forming apparatus includes an ink tank; and an ink supplying path for supplying the ink from the ink tank to a print head, wherein the ink supplying path therein includes a filter, which generates negative pressure when the ink is supplied, the negative pressure being smaller than ink absorbing pressure of a nozzle of the print head. Further, the ink tank therein includes, for example, a porous ink absorbing body for retaining ink. The image forming apparatus satisfies:'&#x3c;1/() where F(m) expresses a filtration accuracy of the filter; N (cells/m) expresses a cell density of the ink absorbing body before the ink absorbing body is contained in the ink tank; and R expresses a compressibility, which is a volume ratio of the ink absorbing body when the ink absorbing body is contained in a compressed state in the ink tank to the ink absorbing body before the ink absorbing body is contained in the ink tank, on condition that: F&#x2032;=F when an opening of the filter is circle; F&#x2032;=&#x221a;{square root over ( )}2&#xb7;F in other cases.

Image forming apparatus

Growing community of inventors

Nara, Japan

Akio Matsumoto