An embodiment of the invention provides a method and system for detecting driver persona in a vehicle wherein an attribute of a user is identified via at least one sensor in the interior of the vehicle. The image sensor includes a circuit layer on a first surface of a semiconductor substrate, a metal interconnection layer on the circuit layer, trenches formed in a second surface of the semiconductor substrate along a boundary of a pixel, and a light blocking layer in the trenches. A gripper has a first end attached to the second end of the head. Further, a rotor may include a protective layer having a fiber sheet hardened with resin for covering an outer peripheral side of a permanent magnet. In the voice command registration mode, the user is caused to select a desired processing, the unrecognized voice is registered, and the desired processing is executed. The electric field along the axial length of the trapping volume has a standard deviation that is no greater than its mean value.