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Frequency modulator for modulating image data based on frequency data of scan lines of an image carrier

  • US 7,170,544 B2
  • Filed: 04/29/2004
  • Issued: 01/30/2007
  • Est. Priority Date: 05/16/2003
  • Status: Expired due to Fees
First Claim
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1. A frequency modulation device incorporated in an image forming apparatus having an image carrier and a laser device, the frequency modulation device modulating input image data, and the laser device scanning the image carrier along a plurality of scan lines responsive to the modulated image data, the frequency modulation device comprising:

  • means for storing frequency information on each of the plurality of scan lines in a format in which each scan line is divided into segments having segment boundaries and the segment boundaries of adjacent scan lines are offset with each other; and

    means for generating frequency data based on the stored frequency information;

    wherein the frequency modulation device modulates the input image data based on the frequency data,wherein said generating means includes a counter generating data including line phase data and segment data and a frequency calculator calculating the frequency data based on the frequency information and the data from the counter.

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