Step 2: laser-beam exposure The laser-beam strikes the surface of the photosensitive drum to neutralize the negative charge. An electrostatic latent image forms where the negative charge was neutralized. Figure 1-15 Laser-beam exposure Laser beam Photosensitive drum Development block Toner adheres to the electrostatic latent image on the photosensitive drum, which becomes visible. Step 3: developing Toner acquires a negative charge from the friction that occurs when the developing roller rotates against the developer blade. The developing bias is applied to the developing roller to make difference in the electric potential of the drum.
The negatively charged toner is attracted to the latent image on the photosensitive drum because the drum surface has a higher potential. The latent image becomes visible on the drum. Figure 1-16 Developing ENWW Image-formation system 25 Developing roller per blade Developing bias Photosensitive drum Develop ing bias