A system for detecting a non-functioning ink-jetting in print heads, the clear material ejection, with the use of a light transmissive substrate

摘要

An apparatus can be seen during the printing ink jets that dummy. The apparatus comprises a transparent substrate on which a test pattern of material is ejected. A light source radiates light into the substrate is a, and an optical sensor generates image data of a surface of the substrate. Light propagates through the substrate, as long as this does not achieve a position at which material is located on the surface. The material thus emitted light, so that a contrast between the surface of the substrate and the light emitting material. Dummy ink-jetting, by comparing the image data with the positions of the light emitting areas on the surface is detected.