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Actuator, optical scanner, and image forming apparatus

  • US 9,186,908 B2
  • Filed: 12/06/2011
  • Issued: 11/17/2015
  • Est. Priority Date: 12/08/2010
  • Status: Active Grant
First Claim
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1. An actuator comprising:

  • a movable member which rotates around a rotation axis;

    a plurality of connecting members which extend from the movable member, the plurality of connecting members located near an outer circumference of the movable member at equal intervals in a plan view; and

    a plurality of support units which respectively support the plurality of connecting members, whereineach of the plurality of connecting members hasa first connecting portion that is connected to the movable member;

    a driving portion rotatably connected with one of the plurality of support units, the driving portion is located at a center of the one of the plurality of support units;

    a second connecting portion that is connected to the driving portion and that is spaced apart from the movable member; and

    a shaft that is connected between the first and second connecting portions, the shaft having a stress relieving portion to relieve stress acting on the shaft, the stress relieving portion being thinner than a remainder of the shaft,the first connecting portion and a group of the driving portion and the second connecting portion are located opposite to each other with respect to the movable member,the first connecting portion, a center of the movable member, the second connecting portion and the driving portion are located on a same linear line, andthe stress relieving portion relieves the stress acting on the shaft so as to prevent deformation of the shaft during rotation of the movable member.

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