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Micro-oscillating member, light-deflector, and image-forming apparatus

  • US 7,643,198 B2
  • Filed: 11/25/2008
  • Issued: 01/05/2010
  • Est. Priority Date: 12/25/2003
  • Status: Expired due to Fees
First Claim
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1. A driving method of a light-deflector comprising the steps of:

  • preparing a system composed of a plurality of movable elements and a plurality of torsion springs, and having a plurality of different isolated characteristic oscillation modes, wherein the plurality of movable elements are connected in series on the same axis by the plurality of torsion springs, and wherein at least one of the plurality of movable elements is a mirror for carrying out light deflection;

    applying a torque to at least one of the plurality of movable elements so that a time of displacing the mirror toward one direction becomes longer than a time of displacing the mirror toward another direction; and

    carrying out light deflection with the mirror within a period of displacing the mirror toward the one direction to irradiate a light to an object to be irradiated.

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