Recorders – Printing – dotting – or punching marker – Ink transfer support or moving means
Patent
1981-09-08
1984-03-13
Tarcza, Thomas H.
Recorders
Printing, dotting, or punching marker
Ink transfer support or moving means
346107R, 350356, G01D 1514, G02F 101
Patent
active
044371063
ABSTRACT:
The imaging optics for an electro-optic line printer include means for coupling light from illuminated picture elements into the regions adjacent such picture elements, so that the cross line motion of the recording medium and/or the limited resolving power of the printing process may be relied upon to reduce, if not eliminate, illumination nulls. To accomplish that, one embodiment employs a tilted phase step in or near the Fourier transform plane of the imaging optics to convert each of the illuminated picture elements into a dual spot diffraction pattern which is tilted or canted relative to the cross line motion of the recording medium. In another embodiment there is a light scattering element which is positioned just in front of the image plane to scatter light from the illuminated picture elements into the null regions without otherwise materially affecting the image. Due to the random phase relationship of the scattered light, any secondary optical interference pattern created thereby has such a high spatial frequency that it is not resolvable by the printing process.
REFERENCES:
patent: 4281904 (1981-08-01), Sprague et al.
Tarcza Thomas H.
Xerox Corporation
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