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Optical scanner and image forming apparatus

  • US 8,553,303 B2
  • Filed: 07/28/2011
  • Issued: 10/08/2013
  • Est. Priority Date: 08/05/2010
  • Status: Active Grant
First Claim
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1. An optical scanner comprising:

  • a light reflecting section having a light reflecting surface;

    a supporting section supporting the light reflecting section;

    a movable section that supports the supporting section and can turn about a rotation center axis;

    at least a pair of movable beams extending from the movable section and disposed in such a way that the movable beams face each other with the movable section interposed therebetween;

    a displacement section connected to one of the movable beams on a side opposite from the movable section;

    a driving section for driving the displacement section;

    two drive beams each extending from the displacement section in a direction along the light reflecting surface and perpendicular to a direction in which the movable beam extends; and

    a supporting frame for supporting the drive beams,wherein the movable beams each include a bending section which is bent and deformed in a thickness direction of the supporting frame by displacement of the displacement section,an end of the supporting section located proximate the movable section is fixed at a position more distant from the light reflecting section than an end face of the movable section that faces the light reflecting section,the supporting section is fixed to a bottom face portion of a concave section of the movable section by being bonded thereto,the displacement section includes a permanent magnet having, along a direction perpendicular to the light reflecting surface, a north pole disposed on a side where one surface of the displacement section is located and a south pole disposed on a side where another surface of the displacement section is located,the displacement section has a through-hole, and the permanent magnet is inserted into the through-hole, andthe driving section includes a coil disposed so as to generate a magnetic field in a direction perpendicular to a polarity of the permanent magnet.

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