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40930701TH DRAFT Vesion 34 /
(5) Developing
Toner is attracted to the electrostatic latent image on the image drum surface to convert it
into a visible toner image. Developing takes place at the contact between the image drum
and the developing roller.
1 As the toner supply roller rotates while rubbing on the developing roller, a friction charge
is generated between the developing roller and the toner, allowing the toner to be
attracted to the developing roller. (The developing roller surface is charged positive and
the toner, negative.)
2 The toner attracted to the developing roller is scraped off by the doctor blade, forming
a thin coat of toner on the developing roller surface.
3 Toner is attracted to the exposed part (low-potential part) of the image drum at the
contact between the image drum and the developing roller, making the electrostatic
latent image visible.
Image drum
Developing roller
Toner supply roller
Doctor blade
Charge roller