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(11) | EP 0 625 730 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Method and apparatus for forming two toner images in a single frame |
(57) A composite toner image made up of first and second toners is formed on an image
member (1). A first electrostatic image of a first polarity is formed on the image
member (1). That electrostatic image is toned with a first toner of the first polarity.
The image member (1) is imagewise exposed to create a second electrostatic image also
of the first polarity. Exposure is overlapped into the portion of the image member
(1) under the first toner image to prevent any charge on the photoconductor of the
first polarity underneath the first toner image from repelling toner into the portions
of the second electrostatic image that are discharged. Preferably, the second exposure
is accomplished through the base (3) of the image member in order to thoroughly expose
portions of the electrostatic image underneath the first toner image. A web image
member (1) is conveniently exposed through its base (3) by a printhead (17) mounted
in an assembly (50) including a positioning bar (70) for properly spacing the printhead
(17) and a lens 54 from the image member 1. |