Laser beam
Unexposed area Exposed area
■ Block 2 : Development
The static latent image formed on the photosensitive drum is visualized by toner deposited in this block.
● Step 3: Development
Toner is deposited on the static latent image formed on the photosensitive drum.
Toner is then charged negatively through friction between the developing cylinder and the developing blade surface. The DC bias
is applied to the developing cylinder to generate potential difference from the photosensitive drum. When the negatively charged
toner contacts the photosensitive drum, it is deposited on the static latent image due to potential difference between the drum
and the developing cylinder.
Developing blade
Developing cylinder
DC negative bias
Photosensitive drum
Unexposed area
Exposed area
Exposed area
Unexposed area
■ Block 3 : Transfer
The toner image on the photosensitive drum is transferred to paper through 3 steps in this block.
● Step 4: Primary transfer
Transfer the toner image on the photosensitive drum to the ITB.
The DC positive bias is applied to the primary transfer pad to charge the ITB positively. By this, the negatively charged toner on
the photosensitive drum is transferred to the ITB.
2. Technical Explanation
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