Canon Kabushiki Kaisha

Keishi Ohsawa

Yuji Sakemi

Hiroaki Tsuchiya

Yoshiro Tomikawa

Kenichiro Waki

Nobuyuki Ito

Takehiro Takano

Yoshiaki Kobayashi

Fumiteru Gomi

Takashi Hino

Hisaaki Senba

Keisuke Hasegawa

Nobutoshi Yoshida

An image forming apparatus including a photosensitive member, a first developer for developing an electrostatic latent image on the photosensitive member, a charger adapted to charge the photosensitive member bearing a first developed image formed by the first developer and having a discharge electrode member and a shield member surrounding the discharge electrode member, an exposure device for image-exposing the photosensitive member charged by the charger, a second developer for developing an electrostatic latent image formed by exposure of the exposure device, and a voltage apply device for applying voltage having the same polarity as that of the first developed image to the shield member.

Multi-color image forming apparatus capable of preventing contamination

An image forming apparatus includes an image bearing member on which first and second electrostatic images are formed, a first developing device for developing the first electrostatic image on the image bearing member with a first toner, and a second developing device for developing the second electrostatic image on the image bearing member bearing the first toner image thereon with a second toner. The second developing device has a toner carrying member opposed to the image bearing member and carrying the toners thereon. The force with which the first toner, having mixed into the second developing device, is carried on the toner carrying member is smaller than the force with which the second toner is carried on the toner carrying member.

Image forming apparatus in which carrying force for a mixing toner by a

A developing sleeve used in a developing device of an electrophotographic apparatus is composed of a sleeve base and an electrodeposition coating formed on the surface of the sleeve base. The electrodeposition coating contains an electrodepositable resin and an electroconductivity-controlling powdery matter, which can be a powdery ceramic, with or without a powdery metal. A developing device for developing an electrostatic latent image and an image-forming apparatus including this developing sleeve are disclosed.

Developing sleeve having an outer ceramic layer developing device for

A developing apparatus includes a guide member for guiding toner toward an image bearing member bearing an electrostatic image thereon, the guide member having a first end and a second end, a vibration generating device for applying an ultrasonic oscillation to the guide member proximate one of the first end and the second end of the guide member, and a vibration absorbing device for absorbing the ultrasonic oscillation in the guide member at the other one of the first end and the second end, wherein toner is conveyed on the guide member in a direction from the absorbing device to the vibration applying device. In one aspect, the toner is a magnetic toner, and a magnetic field is generated on the guide member at a position opposite a surface for guiding the toner.

Powder conveying device

An ultrasonic oscillation is applied in the neighborhood of one end of a guide member for supporting and guiding a powder, so that a transverse proceeding wave is generated in the guide member. The powder moves from the other end of the guide member toward a position of the applied ultrasonic oscillation under the action of this proceeding wave.

A cleaning device which ensures perfect cleaning of the surface of an image bearing member by a cleaning device for cleaning toner remaining on the surface of the image bearing member and a cleaning roller disposed upstream of the cleaning device with respect to the direction of movement of the image bearing member and rotatable while being in contact with the surface of the image bearing member, the cleaning roller having an elastic outer layer of high hardness and an elastic inner layer of lower hardness than the outer layer.

Growing community of inventors

Yokohama, Japan

Keishi Ohsawa