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IP.com Disclosure Number: IPCOM000025509D
Original Publication Date: 1985-Oct-31
Included in the Prior Art Database: 2004-Apr-04

Publishing Venue

Xerox Disclosure Journal


In order to enable an increase in the slit width of the image plane exposure slit of a xerographic copier, a Fresnel lens (1) is placed close to the photoreceptor drum (2). The Fresnel lens focusses the imaging lens (3) at infinity. If it is placed less than 5mm from the photoreceptor, insignificant changes in other conjugate distances are required. Such an arrangement eliminates lateral image slip (leaving only the considerably smaller defocussing) and the major part of longitudinal image slip.