Patent ID: 7450834

Claim:
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 configured to move the movable section in the optical axis direction; and a biasing blade spring including a holding portion having at least a substantially circular configuration for holding the movable section, a plurality of spring portions connected to and disposed equiangularly about the holding portion and capable of being elastically deformed and biasing the movable section in the optical axis direction, and an attachment portion to be attached to the lens barrel, each spring portion having at least a pair of straight line sections and a bent section interconnecting the at least pair of straight line sections, the at least pair of straight line sections and the bent section being disposed between the circular holding portion and the attachment portion; wherein the plurality of spring portions of the biasing blade spring are configured to restrain a movement force produced at the movable section in a plane orthogonal to the optical axis.