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Chapter 2
2-8
In this step, the surface of the photosensitive drum is charged to a uniform negative potential by way of preparing it for the formation of a static image.
The machine uses a method in which charges are directly applied to the surface of its photosensitive drum.
The primary charging roller is made of conducting rubber, and is given an AC bias in addition to a DC bias to ensure that the surface potential of the
photosensitive drum remains uniform.
The DC bias is made to vary in keeping with the developing DC bias, which is varied according to the image density signal coming from the video
controller.
F-2-8
step 2:Å@laser beam exposure
In this step, a static image is formed on the surface of the photosensitive drum.
When the machine scans the surface of the photosensitive drum that has been charged to a negative potential by means of a laser beam, the charges in the
"light" area become neutralized, thus removing the negative potential of the drum surface and turning the area into a latent image.
F-2-9
2.4.1.4 Development Block
0008-0104
In this block, toner is deposited on the static image formed on the surface of the photosensitive drum, turning it into a visible image. The machine uses a
toner projection method for development, and the toner is a single-component toner.
Photosensitive
drum
Primary chargingroller
AC Bias
DC Bias
Laser Beam
Unexposed area
Exposed area
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