Patent ID: 7151901
Filing Date: 2006-12-19
Classification: G03G

Abstract:
1. An image forming apparatus having a latent carrier, a charging device configured to charge a surface of the latent carrier, an exposure device configured to expose a surface of the latent carrier for forming a latent image, and a transfer device provided to transfer a developed toner image on the latent carrier to a recording medium, comprising: a developing device having a developer carrier, the developer carrier configured to replenish the developer to the latent carrier; a pooling portion configured to pool a two-component developer, the two-component developer including: a first measurement device and a second measurement device configured to measure first and second developer characteristics having first and second values, respectively, the first characteristic being different from the second characteristic, the first measurement device having an operation principle different from the second measurement device, wherein a deterioration rate of the two-component developer is determined based on detection results of the first and second measurement devices.