Abstract: A camera module according to an aspect of the invention may include: a housing supporting movements along an optical axis of a lens barrel having a lens therein; a board having an image sensor collecting light incident upon the lens to form an image, and fixed to the housing; filter glass provided within the housing, arranged above the board and creating a space within which the image sensor is provided; and a dust dam provided within the space, the dust dam onto which foreign objects entering the image sensor are stuck so as to prevent the movements of the foreign objects.

Abstract: An automatic travel control method for a unmanned vehicle system is performed on the basis of signals indicating the existence of the curvature of a guide path and right and left digital signals indicating the degree of the curvature of the guide path. In the method, (1) where the guide path is straight, the steering of the vehicle is controlled based on both the right and left digital signals; (2) where the guide path is curved to the right, the steering of the vehicle is controlled based on the right digital signal; and (3) where the guide path is curved to the left, the steering of the vehicle is controlled based on the left digital signal. The curvature existence detecting operation is performed according to the levels of the voltage signals induced to a pair of voltage generating devices located at the right and left sides of the vehicle after generating a magnetic field by applying alternating current to the guide path.