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12 February 1992
8.
IMAGE TRANSFER AND PAPER
SEPARATION
8.1 PRE-TRANSFER LAMP (PTL)
After the latent image is developed but before the image is transferred to the
copy paper, the drum surface is illuminated by the pre-transfer lamp [A]. This
illumination reduces the negative potential on the drum surface [B]. This
prevents toner particles from being re-attracted to the negatively charged
drum during the paper separation process. It also makes image transfer and
paper separation easier.
A cold cathode tube is used for the pre-transfer lamp to provide sufficient light
intensity. A yellow filter [C] is installed for the PTL to reduce ultraviolet light
which would cause light fatigue on the OPC drum.
8.2 IMAGE TRANSFER
A high negative voltage (–5 kV) is applied to the transfer corona wire [D], the
corona wire generates a negative charge, and attracts the positively charged
toner away from the drum and onto the paper. In addition, the paper is held
against the drum by the positive countercharge on the drum.
IMAGE TRANSFER AND PAPER SEPARATION
[B]
[D]
2-67
[C]
[A]
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