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US 2002/0176718 A1Published application
Image forming apparatus and image forming method
AssigneeToshiba Tec Kabushiki Kaisha
InventorHiromichi Mitamura
Life of this patent
Estimating the term…
Abstract
Toner which is made adjacent to a surface of a photosensitive body by a toner carrier is charged, by charge injection from the toner carrier, to have the same polarity as that of a third potential a potential of the toner carrier. A first potential which is a potential of a base material of the photosensitive body, a second potential which is an apparent potential of the photosensitive body, and the third potential of the toner carrier are set such that in the absolute values, first potential>third potential>second potential. As a result, the relation exposed part potential>toner carrier potential>non-exposed part potential, is established. Therefore, the toner is selectively adsorbed only to non-exposed parts.
Claims17
An image forming apparatus comprising:
- a photosensitive body configured to have a photosensitive layer formed on a surface of a base material made of a conductive material;
- a first power supply part configured to supply a first potential V1 to the base material;
- a charging part configured to charge a surface of the photosensitive body with a second potential V2 as an apparent potential of the photosensitive body;
- an exposure part configured to expose areas, in which no toner image is formed, in the surface of the photosensitive body to light;
- a developing part having a toner carrier which carries toner, the developing part being configured to adhere the toner carried by the toner carrier onto the surface of the photosensitive body;
- and
- a second power supply part configured to supply a third potential V3 as a potential of the toner carrier, wherein
- a relation between the potentials V1, V2 and V3 is |V2|<|V3|<|V1|.
5 more elements
An image forming apparatus comprising:
- a photosensitive body configured to have a photosensitive layer formed on a surface of a base material made of a conductive material;
- a first power supply part configured to supply a first potential V1 to the base material;
- a charging part configured to charge a surface of the photosensitive body with a second potential V2 as an apparent potential of the photosensitive body so as to satisfy a relation |V2|<|V1| (if V1 and V2 have the same polarity);
- an exposure part configured to expose toner-image non-forming areas in the surface of the photosensitive body to light;
- a developing part having a toner carrier carrying toner, the developing part being configured to adhere toner carried by the toner carrier onto the surface of the photosensitive body;
- and
- a second power supply part configured to supply a third potential V3 as a potential of the toner carrier so as to satisfy a relation |V2|<|V3|<|V1| (in the case where V1, V2 and V3 have the same polarity).
4 more elements
An image forming apparatus comprising:
- a photosensitive body configured to have a photosensitive layer formed on a surface of a base material made of a conductive material;
- a first power supply part configured to supply a first potential V1 to the base material;
- a charging part configured to charge a surface of the photosensitive body with a second potential V2 as an apparent potential of the photosensitive body such that the second potential V2 has polarity opposite to a polarity of the first potential V1;
- an exposure part configured to expose toner-image non-forming areas in the surface of the photosensitive body to light;
- a developing part having a toner carrier carrying toner, the developing part being configured to adhere toner carried by the toner carrier onto the surface of the photosensitive body;
- and
- a second power supply part configured to supply a third potential V3 as a potential of the toner carrier so as to satisfy a relation |V3|<|V1| (in the case where V1 and V3 have the same polarity).
4 more elements
An image forming method of an image forming apparatus comprising:
- a photosensitive body configured to have a photosensitive layer formed on a surface of a base material made of a conductive material;
- a first power supply part configured to supply a first potential V1 to the base material;
- a charging part configured to charge a surface of the photosensitive body with a second potential V2 as an apparent potential of the photosensitive body;
- an exposure part configured to expose areas, in which no toner image is formed, in the surface of the photosensitive body to light;
- a developing part having a toner carrier carrying toner, the developing part being configured to adhere toner carried by the toner carrier onto the surface of the photosensitive body;
- and
- a second power supply part constructed to supply a third potential V3 as a potential of the toner carrier, wherein
- the potentials V1, V2 and V3 are set to have a relation |V2|<|V3|<|V1.
5 more elements
An image forming apparatus comprising:
- a photosensitive body in which a photosensitive layer is formed on a surface of a base material made of a conductive material;
- first power supply means for supplying a first potential V1 to the base material;
- charging means for charging a surface of the photosensitive body with a second potential V2 as an apparent potential of the photosensitive body;
- exposure means for exposing areas, in which no toner image is formed, in the surface of the photosensitive body to light;
- developing means for having a toner carrier carrying toner, the developing means for adhering toner carried by the toner carrier onto the surface of the photosensitive body;
- and
- second power supply means for a third potential V3 as a potential of the toner carrier, wherein
- a relation between the potentials V1, V2 and V3 is |V2|<|V3|<|V1|.
5 more elements
Dependencies are inferred from the claim text.