Toshiba 350, 452, 453, 353 service manual Magnet Magnetic roller Toner

3

(5)Development

Development is the process of making the elec- trostatic latent images visible to the eye (visible images).

Developer material is supplied to the photocon- ductive drum surface by the magnetic roller. The toner in the developer material adheres to the areas on the drum surface where the poten- tial is lower than the developer bias which is applied to the magnetic roller (reverse develop- ment method).

Magnet

Magnetic roller

Toner

Carrier (always attracted onto the magnet)

Toner

Bias voltage –550 VDC

Toner

Photoconduc- tive drum

Photoconductive layer

Aluminum base

Drum

Magnetic roller

Fig. 3-207

White background Halftone Solid

Fig. 3-208		White background
The (–) potential of the	– 750V	Image not developed
photoconductive drum			Bias poten-
is higher than the devel-	– 550V
			tial
oper bias.		Image developed by toner
	– 300V
The (–) potential of the
photoconductive drum	– 200V
is lower than the devel-
oper bias.
	– 00V
	0	Fig. 3-209

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