Patent ID: 7697061

Claim:
An optical system, comprising: a cylindrically-shaped lens holder; a lens module including at least one lens group received therein, the lens module received in the lens holder, the lens module further comprises a lens barrel receiving the at least one lens group, the lens barrel including a pair of electromagnets; a rotational mechanism rotatably mounted to the lens holder, the rotational mechanism including only one transparent mirror disposed on an optical axis of the lens module, and the transparent mirror configured for being rotated by the rotational mechanism and simultaneously refracting a light signal from outside of the optical system into the lens module to extend the field of view for the lens module, the rotational mechanism comprising a rotational plate defining a center hole, the transparent mirror engagingly secured in the center hole, the rotational plate having a pair of permanent magnets attached on the surface thereof, a magnetic force produced between the electromagnets and the magnets rotating the rotational plate relative to the lens holder; and an image pick-up module configured for receiving the light signal from the lens module.