Pixel clock phase locked loop for a laser scanner

Details Pixel clock phase locked loop for a laser scanner Pixel clock phase locked loop for a laser scanner

1991-06-27

1993-05-18

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358412, 358474, 307269, H04N 104

Patent

active

052125700

ABSTRACT:
A pixel clock phase locked loop for a laser scanner having a rotating multi-faceted polygon receives start-of scan and end-of-scan pulses for each of a plurality of scan lines. A voltage-controlled oscillator outputs a desired frequency of the pixel clock. A desired number of pixels in each scan line is counted, and a pulse is output at the last pixel in the scan line. The end-of-scan pulse and the last pixel pulse are compared, and an output is provided of phase error, the phase error being equal to the difference between the end-of-scan pulse and the last pixel pulse. The phase error for a facet of the polygon is utilized when the facet scans an imaging beam on a next subsequent polygon revolution. The phase error is converted to a voltage, and the phase error voltage is added to a center frequency voltage to generate a composite voltage for controlling the voltage-controlled oscillator.

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"Scan Correction for High-Speed Laser Printers", IBM Technical Disclosure Bulletin, vol. 32, No. 9A, Feb. 1990, pp. 343-344.

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