Patent ID: 7274805

Claim:
A method of driving a surveillance camera, comprising the steps of: using a rotary electric machine for horizontally rotating (panning) the camera, wherein the rotary electric machine has a hollow in the center of its rotary shaft and, further, has a reduction gear having either a hollow in its center which is concentric with the rotary shaft or a hollow output shaft at least in its output part in the case of decelerating a rotation output of the rotary electric machine, a slip ring concentrically provided in the hollow including the hollow output shaft of the reduction gear or a side face of the hollow output shaft, passing power or an electric signal between a stationary portion and a movable portion of the surveillance camera via said slip ring, performing three-dimensional positioning of the surveillance camera, capturing camera video signals of a certain place at n times, and comparing the n camera video signals of the certain place or subtracting the (n−1)th video signal and the n-th video signal (n: an integer of 2 or larger), thereby enabling a deviation in video images to be recognized.