Patent ID: 8475990
Filing Date: 2013-07-02
Classification: G03G

Abstract:
1. An image forming method using an image forming apparatus, the method comprising: providing an image forming apparatus that includes a charging means which is a scorotron charging device, an exposure means, a developing means, a transfer means and an electricity removing means arranged in this order around a periphery of an electrophotographic photoconductor, repeatedly performing image formation by rotating the electrophotographic photoconductor at a predetermined process speed, charging a surface of the electrophotographic photoconductor to a predetermined potential using the charging means, exposing the electrophotographic photoconductor by the exposure means to allow formation of an electrostatic latent image on a surface of the electrophotographic photoconductor, forming a toner image corresponding to the electrostatic latent image, and applying a predetermined transfer bias between the photoconductor and the transfer means to allow the toner image to be transferred onto a recording material, setting a projection area of the charging means per time relative to a photo sensitive layer surface of the electrophotographic photoconductor to be S (cm controlling a variation (V) of a charging potential before and after repeatedly performing image formation, to be within the range of from about −20 to about 0 V, and providing, as the electrophotographic photoconductor, a monolayer type electrophotographic photoconductor containing in a same layer a charge generating agent, a hole transfer agent, an electron transfer agent and a binding resin, and also providing an amine compound represented by general formula (1) as the hole transfer agent: wherein Ra to Rg are each independently a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, or two substituents of Ra to Re adjacent to each other may form a hydrocarbon ring structure; X wherein Rh to Ri are each independently a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms; a repetition number n is an integer of 1 or 2; Rj is a halogen atom, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, and when Rj is plural, they may be the same or different; and the substituent number o is an integer of 0 to 5.