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Image forming apparatus including position detector

  • US 20070086679A1
  • Filed: 10/17/2006
  • Published: 04/19/2007
  • Est. Priority Date: 10/17/2005
  • Status: Active Grant
First Claim
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1. An image forming apparatus, comprising:

  • a movable member configured to move cyclically in synchronization with an image forming process; and

    a position detector comprising;

    a scale attached to the movable member and including a plurality of optical marks formed in line at a substantially constant interval, an image sensor configured to capture data relating to at least one of the plurality of optical marks at a time, a signal processor configured to determine a coordinate of an optical mark with respect to a reference position using the data captured by the image sensor, and a position computing unit configured to compute a distance traveled by the optical mark based on a number of the optical marks that pass the reference position and the coordinate of the optical mark with respect to the reference position.

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