A, infra-red sensors Fresnel lens, is widely used in the human body sensor switch, alarm, infrared thermometer, and infrared imaging, it may be to provide users with a different angle sensors, sensor distance, size, test more than a series of Fresnel lens. B, acrylic lens applications and projectors, LED lights, stage lighting and so on. This acrylic Fresnel lens, according to customer's requirements and the preparation of distance from light source R & D, design all kinds of outgoing angle Fresnel lens.