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Optical scanner and image forming apparatus

  • US 20050093955A1
  • Filed: 08/27/2004
  • Published: 05/05/2005
  • Est. Priority Date: 08/29/2003
  • Status: Active Grant
First Claim
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1. An optical scanner comprising:

  • a plurality of light sources;

    a deflector including a deflecting-reflecting surface which deflects a plurality of bundles of light beams emitted from the plurality of light sources;

    a coupling lens which couples the bundles of light beams emitted from the plurality of light sources;

    a cylindrical lens which directs the bundles of light beams coupled by the coupling lens to the deflector;

    a parallel plate through which the bundles of light beams incident on and deflected from the deflector pass; and

    a scanning-imaging optical system which condenses the bundles of light beams deflected from the deflector on a surface to be scanned, wherein the bundles of light beams incident on the deflector have an angle between the bundles in a rotating plane of the deflector, and expressions
    0.6<



    1max−

    α

    )/(θ

    2

    )<

    1.4 and
    0.6<



    1min−

    α

    )/(θ

    2

    )<

    1.4 are satisfied, where θ

    1max and θ

    1min are maximum and minimum values of an average angle of incidence on the deflecting-reflecting surface in the rotating plane of the deflector, θ

    2 is a half-view angle corresponding to an effective writing width, and α

    is an angle of inclination of the parallel plate in the rotating plane of the deflector with respect to a main scanning direction.

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