Image forming apparatus
First Claim
1. An image forming apparatus comprising:
- a rotatable developer bearing member configured to bear a developer;
a development bias application unit that applies, to the developer bearing member, a development bias used to develop an electrostatic latent image;
a supply roller to which a supply bias is applied by a supply bias application unit to supply the developer to the developer bearing member, the image forming apparatus being capable of forming an image in each of a first image forming region which corresponds to a first recording material and a second image forming region which is located at an interval less than a circumferential length of the developer bearing member and corresponds to a second recording material which is conveyed following the first recording material; and
a control unit that controls an electric potential difference between the developer bearing member and the supply roller in such a manner that force in a direction from the supply roller toward the developer bearing member acts on the developer in a section of an image forming region extending from a leading edge of the first image forming region toward a trailing edge thereof,wherein the control unit controls an electric potential difference between the developer bearing member and the supply roller in such a manner that force in a direction from the supply roller toward the developer bearing member acting on the developer becomes smaller in a section extending from a switching point, which is located at a position obtained by returning from a leading edge of the second image forming region to the first image forming region by a distance equal to or greater than the circumferential length of the developer bearing member, to the trailing edge of the first image forming region.
1 Assignment
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Accused Products
Abstract
An image forming apparatus includes a control unit that controls an electric potential difference between a development roller and a supply roller in such a manner that force in a direction from the supply roller toward the development roller acts on toner in a section of an image forming region extending from a leading edge of a first image forming region toward a trailing edge thereof. The control unit controls the electric potential difference in such a manner that force acting on the toner becomes smaller in a section extending from a switching point, which is located at a position obtained by returning from a leading edge of a second image forming region to the first image forming region by a distance equal to or greater than a circumferential length of the development roller, to the trailing edge of the first image forming region.
1 Citation
9 Claims
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1. An image forming apparatus comprising:
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a rotatable developer bearing member configured to bear a developer; a development bias application unit that applies, to the developer bearing member, a development bias used to develop an electrostatic latent image; a supply roller to which a supply bias is applied by a supply bias application unit to supply the developer to the developer bearing member, the image forming apparatus being capable of forming an image in each of a first image forming region which corresponds to a first recording material and a second image forming region which is located at an interval less than a circumferential length of the developer bearing member and corresponds to a second recording material which is conveyed following the first recording material; and a control unit that controls an electric potential difference between the developer bearing member and the supply roller in such a manner that force in a direction from the supply roller toward the developer bearing member acts on the developer in a section of an image forming region extending from a leading edge of the first image forming region toward a trailing edge thereof, wherein the control unit controls an electric potential difference between the developer bearing member and the supply roller in such a manner that force in a direction from the supply roller toward the developer bearing member acting on the developer becomes smaller in a section extending from a switching point, which is located at a position obtained by returning from a leading edge of the second image forming region to the first image forming region by a distance equal to or greater than the circumferential length of the developer bearing member, to the trailing edge of the first image forming region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification