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• Developing step
The developing cylinder comprises a magnet and sleeve. First, the toner is
charged to have a negative electrical charge by the friction between with
the rotating developing cylinder. The toner is then attracted by the magnet
to be held in contact on the sleeve. The toner on the sleeve is regulated by
the blade to form a uniform layer of toner on the surface of the sleeve. The
potential of the AC bias previously applied to the developing cylinder
changes, and toner jumps to the electrostatic latent image section on the
surface of the photosensitive drum when the electromagnetic field between
the surface of the developing cylinder and the electrostatic latent image
section on the surface of the photosensitive drum becomes stronger than
the force of the magnetic that is attracting the toner. This development is
called the "toner projection development."
Photosensitive
drum
DC bias is also applied to the developing cylinder in addition to the AC
bias. This DC bias is the center of the amplitude of the AC bias voltage.
Accordingly, the peak of the AC bias voltage changes by varying the DC
bias. The AC and DC biases adjust the amount that the toner jumps and
works to improve the contrast of the image.
Next, let's explain the function of toner during development.
Blade
Toner
AC bias
DC bias
Fig. 4-49 Development
RECORDING SECTION
Magnet
Developing
Sleeve
cylinder
4–39
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2
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çi
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