US 2014/0270826 A1Published application

Image forming apparatus

AssigneeCanon Kabushiki Kaisha

InventorsKenta Kubo, Tetsuya Atsumi, Tomohito Ishida, Megumi Uchino, Shunichi Takada

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Abstract

The image forming apparatus includes an image carrier, a developer carrier, a magnetic field generation unit that is fixedly disposed in a hollow part of the developer carrier and includes a plurality of magnetic poles disposed in a circumferential direction of the developer carrier, a conductive member disposed so as to oppose a predetermined magnetic pole, of the plurality of magnetic poles, which is located odd-number pole upstream of a magnetic pole corresponding to a developing area D in a rotational direction of the developer carrier, a power source that can apply a voltage to the conductive member, a potential detection unit configured to detect pre-development and post-development potentials of a predetermined image formed on the image carrier, and a changing unit configured to change the voltage to be applied from the power source to the conductive member based on a detection result obtained by the potential detection unit.

Claims12

Dependent claims

An image forming apparatus comprising;

an image carrier on which an electrostatic image can be formed;
a rotatable developer carrier that can carry and convey a developer containing toner particles and carrier particles to supply the toner particles to the image carrier at a developing area to develop the electrostatic image formed thereon;
a magnetic field generation member that is fixedly disposed in a hollow part of the developer carrier and includes a plurality of magnetic poles disposed in a circumferential direction of the developer carrier;
a conductive member disposed so as to oppose a predetermined magnetic pole, of the plurality of magnetic poles, which is located odd-number pole upstream of a magnetic pole corresponding to the developing area in a rotational direction of the developer carrier;
a power source that can apply a voltage to the conductive member;
a potential detecting device configured to detect a potential on the image carrier;
and
a control unit configured to control the voltage to be applied from the power source to the conductive member based on pre-development and post-development potential information about a predetermined latent image pattern formed on the image carrier.

5 more elements

An image forming apparatus comprising:

an image carrier on which an electrostatic image can be formed;
a rotatable developer carrier that can carry and convey a developer containing toner particles and carrier particles to supply the toner particles to the image carrier at a developing area to develop the electrostatic image formed thereon;
a magnetic field generation member that is fixedly disposed in a hollow part of the developer carrier and includes a plurality of magnetic poles disposed in a circumferential direction of the developer carrier;
a conductive member disposed so as to oppose a predetermined magnetic pole, of the plurality of magnetic poles, which is located odd-number pole upstream of a magnetic pole corresponding to the developing area in a rotational direction of the developer carrier;
a power source that can apply a voltage to the conductive member;
an image density detecting device configured to detect the density of the image formed on the image carrier;
and
a control unit configured to control the voltage to be applied from the power source to the conductive member based on a detection result obtained by the image density detection unit.

5 more elements

Dependencies are inferred from the claim text.