Micro-oscillating member, light-deflector, and image-forming apparatus
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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Abstract
The present invention provides a resonance type micro-oscillating member capable of retraining a fluctuation of angular velocity, and specifically provides a micro-oscillating member, which is a nested micro-oscillating member, wherein there exist a reference oscillation mode which is the characteristic oscillation mode of a reference frequency, and an even numbered oscillation mode which is the characteristic oscillation mode of a frequency being approximate even number times the reference frequency.
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6 Claims
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1. A driving method of a light-deflector comprising the steps of:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification