| http://www.w3.org/ns/prov#value | - The write head preferably has an array of light-emitting diodes or other light source such as a laser or other spatial light modulator for exposing the photoconductive belt picture element (pixel) by picture element with a regulated intensity and exposure, EO. Alternatively, the exposure may be by optical projection of an image of a document or a patch onto the photoconductor.
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