Abstract: A surveillance system includes a ring-shaped track, a first support frame, at least one first roller, at least one second roller and a lens module. The ring-shaped track has an outside flanged portion and an inside flanged portion. The at least one first roller is disposed on the first support frame and leans against the outside flanged portion. The at least one second roller is disposed on the first support frame and leans against the inside flanged portion, such that the ring-shaped track is sandwiched in between the at least one first roller and the at least one second roller. The lens module is disposed on the first support frame.

Abstract: A surveillance system includes a ring-shaped track, a first support frame, at least one first roller, at least one second roller and a lens module. The ring-shaped track has an outside flanged portion and an inside flanged portion. The at least one first roller is disposed on the first support frame and leans against the outside flanged portion. The at least one second roller is disposed on the first support frame and leans against the inside flanged portion, such that the ring-shaped track is sandwiched in between the at least one first roller and the at least one second roller. The lens module is disposed on the first support frame.

Abstract: A photographic device includes an upper cover component, a lens module, a signal line set, a circuit board, and a lower cover. The upper cover component comprises an upper casing having a through hole and a transparent mask. The transparent mask is fastened under the through hole and exposed by it and does not protrude from an outer surface of the upper casing. The lens module has a photographic lens facing the mask. The signal line set has a fixing end fastened to one end of the upper casing. The circuit board is electrically connected to the lens module and the signal line set. The lower cover and the upper casing are joined and enclose the lens module and the circuit board. As the transparent mask does not protrude from the outer surface of the upper casing, cracks of the transparent mask caused by a foreign object can be prevented.

Abstract: A photographic device includes an upper cover component, a lens module, a signal line set, a circuit board, and a lower cover. The upper cover component comprises an upper casing having a through hole and a transparent mask. The transparent mask is fastened under the through hole and exposed by it and does not protrude from an outer surface of the upper casing. The lens module has a photographic lens facing the mask. The signal line set has a fixing end fastened to one end of the upper casing. The circuit board is electrically connected to the lens module and the signal line set. The lower cover and the upper casing are joined and enclose the lens module and the circuit board. As the transparent mask does not protrude from the outer surface of the upper casing, cracks of the transparent mask caused by a foreign object can be prevented.