Development block
The second part of the image formation process is the development block, in which toner is
transferred onto the electrostatic latent image on the surface of the photosensitive drum,
creating a visible image. This printer uses a contact development method that keeps the
developing cylinder in contact with the drum, pushing the toner against the drum surface for
development. The toner is non-magnetic and consists of resins. This block consists of two
steps:
● toner charging
● development
Figure 5-22. Development block shows a cross-section of a print cartridge and illustrates the
development block.
Figure 5-22.
Development block
Step 4: Toner charging
As the toner stirring blade turns inside the cartridge, the friction creates a negative potential
on the toner. A negative voltage is applied to the toner charging roller and creates a uniform
negative potential on the toner.
Step 5: Development
The areas on the photosensitive drum that have been exposed to the laser beam have a
higher potential (are less negatively charged) than the toner particles on the developing
cylinder. As the photosensitive drum rotates, the toner adheres to the exposed areas on the
photosensitive drum. At this point, the image is visible on the drum surface.
ENWW Image formation system 157
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