Minolta Company, Ltd.

Minolta Camera Kabushiki Kaisha

Toeisangyo Co., Ltd.

Keiko Nagayasu

Akihito Ikegawa

Masashi Yamamoto

Isao Doi

Masaki Asano

Seishi Ojima

An image forming apparatus having an insulated member disposed adjacent to a photosensitive member, a scanner exposing an image on the photosensitive member in a direction perpendicular to the direction of movement of the insulated member while voltage is applied between the photosensitive member and the insulated member so as to provide a charge on the insulated member surface corresponding to the optical exposure image. The exposure position exposed by the scanner is changed in the direction of movement of the image-bearing member for each scan.

Image forming apparatus

In electrophotographic image forming, there are provided a charging device and an image forming apparatus provided with the charging device for forming an image including no or less image noise by sufficiently suppressing generation of image memory due to untransferred residual developer. The charging device has, for example, a charging brush formed of a roller and a strip-like fiber member having a plurality of piles wound therearound. The brush satisfies a condition of 0.7s&lt;d&lt;1.5s where d(mm) is a wound margin of the strip-like fiber member, and s(mm) is an average distance between the piles in a width direction of the fiber strip member.

Charging device and image forming apparatus

An image forming apparatus for forming a latent image on a photosensitive member, developing the latent image by a developing device, transferring the developed image onto a sheet, and cleaning a residual toner remaining on the photosensitive member after transferring by the developing device. The image forming device has a shaver which shaves the surface of the photosensitive member within a range of about 2 .mu.m or greater but less than 15 .mu.m, within 7,000 rotations of the photosensitive member. Further the toner for developing the latent image satisfies the following conditions:

An image forming apparatus for forming a latent image on a photosensitive member, developing the latent image by a developing device to transfer the developed image onto a recording paper, and cleaning residual toner on the photosensitive member after transferring by the developer. The photosensitive member has a hardness such that a conical diamond produces on a surface of the photosensitive member a scratch of 30 .mu.m or greater but no more than 180 .mu.m in width, when the diamond scratches the surface of the photosensitive member under a vertical load of 50 g and relative speed of 100 mm/min, the diamond having a conical angle of 120.degree. and hemisphere shaped leading edge with a radius of 0.2 mm. The image forming apparatus further includes at least one rotational brush provided in contact with the photosensitive member under the conditions of :

Image forming apparatus with a member for shaving the surface of a

An image forming apparatus that includes a positioning device for selectively positioning a contact-charging member at a charging position where the contact-charging member contacts a photosensitive carrier at a first region or at a cleaning position where the contact-charging member contacts the carrier at a second region. A contact charger apparatus for charging a carrier for carrying an electrostatic latent image, said contact charger apparatus that includes a voltage source coupled to a contact charger for applying a voltage to said carrier; and a contact charger cleaner for changing a contact area between said contact charger and said carrier to effect cleaning of said contact charger.

Contact type charging device and image forming apparatus having the same

A contact charging device which charges a rotatable photoreceptor. The contact charging device has a support member provided adjacently to the photoreceptor, first and second films each one end portion of which is supported by the support member. Each free end portion of the first and second films is in contact with the surface of the photoreceptor. The second film is positioned on downstream side from the first film with respect to a rotational direction of the photoreceptor. In the above charging device, a resistance value of the first film is higher than a resistance value of the second film.

Contact charger and image forming apparatus provided with same

A contact charging device for charging an outer surface of an electrostatic latent image carrier in contact therewith which has a charging member at least partly in contact with the electrostatic latent image carrier, the portion of the charging member in contact with the electrostatic latent image carrier being formed by a layer containing a copolymer of an olefin-type vinyl monomer and a fluorine-contained monomer, and a power supply for applying a charging voltage to the charging member.

Charging device for charging outer surface of photosensitive member

A contact charger in an electrophotographic image forming apparatus for electrostatically charging a photosensitive, latent image support surface of a rotatably supported photosensitive drum in contact therewith. The contact charger comprises a generally elongated carrier and a charging member carried at a first side edge by the carrier. This charging member has a second side edge opposite to the first side edge which is held in sliding contact with the photosensitive surface over a predetermined contact distance. The charging member has a curved surface of a radius of curvature of 0.02 to 1.0 mm at a side edge portion thereof at which contact of the charging member with the photosensitive surface terminates. A power source for applying a voltage to the charging member is also employed.

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Ibaraki, Japan

Keiko Nagayasu