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Color image forming apparatus having means for properly superimposing image colors on each other

  • US 5,294,944 A
  • Filed: 02/26/1992
  • Issued: 03/15/1994
  • Est. Priority Date: 03/06/1991
  • Status: Expired due to Fees
First Claim
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1. An image forming apparatus comprising:

  • scanner means, using a plurality of laser beams having the same characteristic, for scanning a predetermined color image, each of the laser beams representing the predetermined color image and being shifted with respect to each other in a vertical scanning direction by a first pitch, the first pitch being defined by dividing a diameter of each of the laser beams by the number of the laser beams;

    an optical recording system including a rotating polygon mirror which deflects each of the laser beams;

    a body system including a rotating photosensitive body onto which each laser beam deflected by the rotating polygon mirror is radiated so as to form a latent image corresponding to the predetermined color image; and

    selecting means for selecting one of the laser beams of the scanner means based on a time difference between a position detecting signal and a position signal, the position detecting signal indicating that each laser beam is ready to be radiated onto the photosensitive body of the body system, the position signal indicating that the photosensitive body is located at a position where each laser beam can be properly radiated thereon, and the position detecting signal being asynchronous with the position signal.

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