Recorders – Printing – dotting – or punching marker – Ink transfer support or moving means
Patent
1979-11-23
1981-05-26
Hartary, Joseph W.
Recorders
Printing, dotting, or punching marker
Ink transfer support or moving means
350 68, 358285, 358302, G01D 1514
Patent
active
042701317
ABSTRACT:
An adaptive system is shown for electronically correcting for errors in a laser scanner. A start-of-scan signal is provided by a photodetector having a special mask with a window over the front of the photodetector. The start-of-scan signal from the photodetector eliminates the facet-to-facet errors. The special mask gives a stepped amplitude signal output from the photodetector with the maximum amplitude of the signal providing amplitude modulation to correct the intensity of the laser beam, and the lower amplitude of the stepped amplitude signal providing frequency modulation to correct the facet-to-axis error. By the use of the delays, counters, and memory, the intensity and facet-to-axis errors are continuously being corrected with each revolution of the spinner.
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Helmberger et al; Correction of Axial Deflection Errors in Rotating Mirror Systems; Optics & Laser Technology, Dec. 1975.
Donzis Henry M.
Tompkins E. Neal
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