Proceedings PaperAperture alignment effect on ionography head
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Delphax type ionographic heads are one of the image writing bar devices used in nonimpact printers. One design issue is that an error of screen electrode alignment on ion generator may cause a significant variation of output current. In this study the relationship between alignment error and the output current is identified from the results of a multiple regression analysis on experimental data. In conclusion the magnitude of the effect of an alignment error on the output current is —1.1% per micrometer. Based on this value, a dimensional tolerance can be derived for the design and assembly of head parts according to required uniformity of output current. The secondary factor of output current variation is the difference between drive electrodes, which can be corrected by input voltage. The magnitude of the effect of screen aperture diameter variation is 0.32 % per micrometer, which is small enough to be negligible.