Abstract: An image formation device for forming an image by an electrophotographic process includes a charge voltage controller configured to control an application charge voltage to be applied to a charge member, a transfer voltage controller configured to control a transfer voltage to be applied to a transfer member, a charge current detector configured to detect a charge current flowing through the charge member, and a controller configured to determine the application charge voltage according to the application charge voltage and the detected charge current, both detected when the transfer voltage controller applies a predetermined transfer voltage.

Abstract: An image forming apparatus includes a photosensitive body carrying an electrostatic latent image on a surface thereof, a charge device charging the surface of the photosensitive body, an exposure device forming the electrostatic latent image on the photosensitive body, a development device developing the electrostatic latent image so that a developer image is formed, and a transfer device transferring the developer image on a print medium. Wherein, a positive charge dark decay rate of the photosensitive body is greater than a negative charge dark decay rate when a dark decay rate is expressed by ? V ? ? 0 ? - ? V ? ? 5 ? ? V ? ? 0 ? × 100 ? ( % ) where V0 [V] is a surface potential of the photosensitive body immediately after a completion of the charging by the charge device, and V5 [V] is the surface potential when the photosensitive body is left in a dark place for 5 seconds immediately after the completion of the charging.

Abstract: An image formation apparatus includes a photoreceptor, a charge unit, an exposure unit, a development unit, and a transfer unit. The photoreceptor satisfies the following formulas. 0.9?(|V0(2)?VL|)/(|V0(1)?VL|)?1.0 2.0?|VL|/L?3.5 VL denotes a post-exposure surface potential value [V] of a surface portion of the photoreceptor exposed by the exposure unit in a first image formation cycle; V0(2) denotes a charge potential value [V] in a second image formation cycle of a surface portion of the photoreceptor exposed by the exposure unit in the first image formation cycle; V0(1) denotes a charge potential value [V] in a second image formation cycle of a surface portion of the photoreceptor not exposed by the exposure unit in the first image formation cycle; and L denotes a film thickness [?m] of the photosensitive layer.

Abstract: An image formation device for forming an image by an electrophotographic process includes a charge voltage controller configured to control an application charge voltage to be applied to a charge member, a transfer voltage controller configured to control a transfer voltage to be applied to a transfer member, a charge current detector configured to detect a charge current flowing through the charge member, and a controller configured to determine the application charge voltage according to the application charge voltage and the detected charge current, both detected when the transfer voltage controller applies a predetermined transfer voltage.

Abstract: An image formation apparatus includes a photoreceptor, a charge unit, an exposure unit, a development unit, and a transfer unit. The photoreceptor satisfies the following formulas. 0.9?(|V0(2)?VL|)/(|V0(1)?VL|)?1.0 2.0?|VL|/L?3.5 VL denotes a post-exposure surface potential value [V] of a surface portion of the photoreceptor exposed by the exposure unit in a first image formation cycle; V0(2) denotes a charge potential value [V] in a second image formation cycle of a surface portion of the photoreceptor exposed by the exposure unit in the first image formation cycle; V0(1) denotes a charge potential value [V] in a second image formation cycle of a surface portion of the photoreceptor not exposed by the exposure unit in the first image formation cycle; and L denotes a film thickness [?m] of the photosensitive layer.

Abstract: An image forming apparatus includes: an image supporting member; a charge member for charging a surface of the image supporting member; an exposure member for forming a latent image on the surface of the image supporting member charged by the charge roller; a developer supporting member for developing the latent image formed by the exposure member to form a toner image; and a transfer member for transferring the toner image formed by the developer supporting member to a medium. The image supporting member has a dark decay characteristic ratio of 95% or less relative to charges having a polarity opposite to that of a charge voltage applied by the charge member.

Abstract: A durability with respect to a film wear and defect of a photosensitive layer on the photosensitive body is improved, and thinning the photosensitive layer is planned. An image forming unit that comprises a photosensitive body; a charge means that charges surface of the photosensitive body; a development means that develops an electrostatic latent image formed on the surface of the photosensitive body with the developer through shining an exposure light to form a developer image on the surface of the photosensitive body; and a cleaning means that removes remaining developer on the surface of the photosensitive body by pressing against the surface of the photosensitive body. On the top surface layer of the photosensitive body, Martens hardness value is 175˜196N/mm2; elastic deformation rate is 35˜48%; and static friction coefficient is under 0.535.

Abstract: An image forming unit includes a photosensitive member for forming a static latent image upon exposure and a developer image with developer. The photosensitive member includes a surface layer formed of a binder resin having a static frictional coefficient equal to or less than 0.535, and having a maximum surface roughness equal to or greater than 0.32 ?m.

Abstract: An image forming apparatus includes: an image supporting member; a charge member for charging a surface of the image supporting member; an exposure member for forming a latent image on the surface of the image supporting member charged by the charge roller; a developer supporting member for developing the latent image formed by the exposure member to form a toner image; and a transfer member for transferring the toner image formed by the developer supporting member to a medium. The image supporting member has a dark decay characteristic ratio of 95% or less relative to charges having a polarity opposite to that of a charge voltage applied by the charge member.