Self aligning raster input scanner

Details Self aligning raster input scanner Self aligning raster input scanner

1986-09-24

1988-02-09

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

358293, 358294, H01J 4014

Patent

active

047243309

ABSTRACT:
A system for calibrating a raster input scanning device for detecting an image on a preselected surface, including a linear photoelectric sensor array comprising a plurality of discrete photosensitive elements arranged along a first axis, for sensing and generating electrical representations of an image on a surface; a carriage assembly movable along a second axis, transverse to said first axis; and supporting a sensor detectable target image for movement along the second axis. The sensor detectable target image includes an alignment feature for use during alignment operations. A drive system moves the carriage assembly carrying the target image from a starting position along said second axis, and the distance traveled by the carriage assembly from said starting point until the alignment feature on said target image is sensed is measured. A y-axis comparator compares the measured distance with a y-axis reference to determine an y-axis offset value which is stored in a y-axis memory as an y-axis offset value. Magnification and focus calibration are provided in similar fashion.

REFERENCES:
patent: 4149091 (1979-04-01), Crean et al.
patent: 4314159 (1982-02-01), Davis
patent: 4358794 (1982-11-01), Kurakami et al.
patent: 4459619 (1984-07-01), Yoshida
patent: 4465939 (1984-08-01), Tamura
patent: 4675745 (1987-01-01), Suzuki
Xerox Disclosure Journal; "Raster Scanner Alignment Technique"; M. A. Agulnek; vol. 5, No. 3, May/Jun. 1980; pp. 301-302.

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