Minolta Camera Kabushiki Kaisha

Toeisangyo Co., Ltd.

Kenzo Tanaka

Izumi Osawa

Shuji Iino

Akihito Ikegawa

Masaki Asano

Tadashi Ohira

Noriko Yoshida

An image forming apparatus provided with a contact charging device, in which an electrically conductive member contacts a surface of an electrostatic latent image carrier for charging the surface, wherein at least impurity atom selected from the group consisting of elements of Group IA, II, VI and VII of the periodic table is adhered to the electrically conductive member, and a total content of the impurity atom is in a range from 0.05 wt % to 0.45 wt% with respect to all atoms including the impurity atom and atoms forming the electrically conductive member.

An electrically conductive member of an image forming apparatus

A contact member for controlling an electrostatic state of a surface of a chargeable member includes electrically conductive base members, and flame retardant material included in the base members.

Contact member for controlling an electrostatic state of a chargeable

A toner image fixing device to be incorporated into an electrophotographic copying machine or the like, comprises fixing rollers internally provided with heating means, temperature detecting means for detecting the respective surface temperatures of the fixing rollers, and control means which controls the fixing rollers for preliminary rotation prior to copying operation on the basis of the surface temperature difference between the fixing rollers and a predetermined value. In starting up the electrophotographic copying machine, the preliminary rotation of the fixing rollers is started after the temperature difference between the fixing rollers has reached to a predetermined value to enable heat energy to be transferred from one of the fixing rollers to the other and to eliminate the uneven temperature distribution. The preliminary rotation of the fixing rollers is stopped a predetermined time after the surface temperature of one of the fixing rollers has reached to a predetermined temperature.

Toner image fixing device

A copying machine provided with data storing means for storing a plurality of designated magnification ratios and a plurality of hidden magnification ratios, a first key for selecting a desired magnification mode such as designated magnification mode or hidden magnification mode and a plurality of second keys for selecting magnification ratios from the data stored in the data storing means so that various kinds of magnification ratios can be easily selected with a simple operation of the decreased number of keys.

Growing community of inventors

Ikoma, Japan

Kenzo Tanaka