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Motion quality requirement for single pass color registration

This paper discusses an analytical investigation of the motion quality requirement of an image carrier with respect to the given allowable image misregistration between the primary colors. The system analyzed is concerned with a one pass configuration in which the image carrier traverses by sequentially multiple imaging stations in a single pass. Examples of such a system are full width ink jet color printers and thermal transfer color printers. The motion quality of the image carrier, which is the printed substrate in the above examples, impacts directly the positional registration between the colors and in turn the print quality. To characterize the image carrier motion, its traversing velocity is represented by the Fourier sum of the dc and ac components. The amplitude and frequency of the ac velocity component are used as the characteristic measure in the context of motion quality. The analytical expression for motion quality is derived by applying one ac velocity component at a time. The frequency domain spectrum is then generated by sweeping the frequency through the range of interest. An intriguing phenomenon called "error synchroneity" can be shown when the spatial period of the ac velocity component is an integer fraction of the distance between the imagers. At these frequencies, the positional errors of the different color images are offset, regardless of their amplitude. Consequently, the print of the composite images is perceived to be in registration, without color shifts and other associated problems.