| US 7,602,439 B2 | ||
| Lens unit and imaging apparatus | ||
| Tatsuo Makii, Tokyo (Japan); Motoshige Ito, Kanagawa (Japan); Hideo Okamoto, Tokyo (Japan); Takeshi Takizawa, Kanagawa (Japan); Takatoshi Uneme, Tokyo (Japan); Keishi Iwana, Tokyo (Japan); Satoshi Imai, Kanagawa (Japan); and Fujio Kanai, Kanagawa (Japan) | ||
| Assigned to Sony Corporation, Tokyo (Japan) | ||
| Filed on Feb. 10, 2006, as Appl. No. 11/351,113. | ||
| Claims priority of application No. 2005-037971 (JP), filed on Feb. 15, 2005; and application No. 2005-065933 (JP), filed on Mar. 09, 2005. | ||
| Prior Publication US 2006/0181632 A1, Aug. 17, 2006 | ||
| Int. Cl. H04N 5/225 (2006.01) | ||
| U.S. Cl. 348—374 | 28 Claims |
| 1. A lens unit comprising:
a lens barrel in which an imaging optical system is disposed;
a movable section including a movable lens and configured to be moved in an optical axis direction relative to the lens barrel;
a linear actuator including a drive magnet and a drive coil and configured to move the movable section in the optical axis
direction by supplying a current to the drive coil; and
a first and second biasing blade springs including holding portions for holding the movable section, a plurality of spring
portions capable of being elastically deformed and biasing the movable section in the optical axis direction, and attachment
portions to be attached to the lens barrel;
wherein the second biasing blade springs is formed with two spring members;
wherein a thickness of the second biasing blade spring is thinner than a thickness of the first biasing blade spring such
that the spring force of the first biasing blade spring is larger than a spring force of the second biasing blade spring;
and
wherein the current is supplied to the drive coil via the two spring members.
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