Patent ID: 9565319
Date: 2017-02-07
CPC Classifications: G03G,H04N

Claim:
1. An image forming apparatus, comprising: an exposure device configured to form an electrostatic latent image under an increased exposure amount; a developing device configured to visualize the electrostatic latent image as a black toner image under an increased developing bias; a rotatable image bearer configured to bear a black toner pattern formed with the black toner image; an optical sensor, opposite the image bearer, configured to detect an amount of reflection light reflected by the black toner pattern on the image bearer, the optical sensor including: wherein the toner adhesion amount is calibrated based on at least one of a result of the optical sensor with a white reference plate provided inside the optical sensor and a plurality of toner patterns having different image densities, respectively, with the optical sensor that detects a specular reflection light and a diffuse reflection light.