A SECURITY DEVICE WITH A FULL LENGTH LENS

摘要

A security device including a Fresnel lens covering the entire face of the device, a housing, and a pyroelectric detector is disclosed. The center portion of the Fresnel lens which contains the Fresnel lens elements is molded flat, it's edges are molded in the final installed form and its edges contain appendages that secure the lens on the device so there are no gaps between the lens and the device.