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.
Lam Wong, Lam Wong,
"Motion quality requirement for single pass color registration", Proc. SPIE 1670, Color Hard Copy and Graphic Arts, (1 May 1992); doi: 10.1117/12.2322255; https://doi.org/10.1117/12.2322255