Patent ID: 6167212
Filing Date: 2000-12-26
Classification: G03G

Abstract:
A development density adjusting method for an image forming apparatus, comprising steps of:forming a development area by opposing a developer bearing member bearing developer to an image bearing member bearing an electrostatic latent image;applying a voltage to said developer bearing member, wherein a value of said voltage periodically includes a first voltage value for forming an electric field adapted to direct the developer in a direction toward said image bearing member in the development area, and a second voltage value for forming an electric field adapted to direct the developer in a direction away from said image bearing member in the development area; andadjusting development density by varying ratio of application time of a voltage having said first voltage value to application time of a voltage having said second voltage value in one period, and difference between a potential of said developer bearing member and a potential of said electrostatic latent image, when the voltage having said first voltage value is applied to said developer bearing member;wherein, in increasing the development density, the ratio of the application time of the voltage having said first voltage value to the application time of the voltage having said second voltage value in the one period is increased.