Abstract
AbstractAn analysis program is developed to evaluate the readout ability of the direct‐contact type linear‐image sensors that do not possess the image‐forming optical systems. It is used exclusively to evaluate the readout characteristics of the direct‐contact type linear‐image sensors. the program deals with the sensors with multi‐layer structures parallel to the XY plane of the 3‐D (and mutually orthogonal) XYZ coordinate system. the optical path of the illuminating light emerging from the source, attenuations at the boundaries between different materials and the lights blocked by the electrode and the receiver are calculated if they are used in determination of the illumination distribution in the XY plane. the calculation procedure comprises two parts: the illumination on the document plane due to emerged light from the source, and the reflected light from the document onto the sensor. This program takes not only document plane reflections into account but can also factor in the reflections caused by light penetrations into the document paper (Yule‐Nielsen effect). Investigations using this program show that the resolution of the read‐out function of direct‐contact type sensors strongly depends on the distance from the document to the receiver and the quality of its paper.
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