| US 7,518,774 B2 | ||
| Optical deflector and optical instrument using the same | ||
| Takahisa Kato, Tokyo (Japan); Kazutoshi Torashima, Kanagawa-ken (Japan); Yukio Furukawa, Mountain View, Calif. (US); and Yasuhiro Shimada, Kanagawa-ken (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Jun. 26, 2008, as Appl. No. 12/146,561. | ||
| Application 12/146561 is a division of application No. 11/753062, filed on May 24, 2007, granted, now 7,423,795. | ||
| Claims priority of application No. 2006-149940 (JP), filed on May 30, 2006. | ||
| Prior Publication US 2008/0266632 A1, Oct. 30, 2008 | ||
| Int. Cl. G02B 26/08 (2006.01) | ||
| U.S. Cl. 359—224 [359/291] | 7 Claims |
| 1. An optical deflector, comprising:
an oscillating system; and
a driving system configured to drive said oscillating system;
wherein said oscillating system includes a first oscillator, a first torsion spring, a second oscillator, a second torsion
spring and a supporting member,
wherein said first oscillator includes a first movable element having a reflecting surface,
wherein said second oscillator includes a second movable element having a moment-of-inertia adjusting member,
wherein said first movable element is resiliently supported by said second movable element through said first torsion spring,
for torsional oscillation about an oscillation axis,
wherein said second movable element is resiliently supported by said supporting member through said second torsional spring,
for torsional oscillation about the oscillation axis, and
wherein said oscillating system has at least two natural oscillation modes having different frequencies, about the oscillation
axis.
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