Fresnel lens

The Fresnel lens is a special optical lens invented by the French physicist Augustin Fresnel in the 19th century. It has the following characteristics: 1. Unique structure: Its surface consists of a series of concentric circular serrated patterns (Fresnel rings), which compress the continuous curved surface of a traditional convex lens into a stepped structure on a plane. This retains the function of focusing or collimating light while significantly reducing the thickness and weight of the lens. 2. High-efficiency light concentration: It can efficiently converge light, focusing parallel light to a single point (focus) or converting divergent light into parallel light. With a light transmission efficiency of over 90%, it is lighter and more cost-effective than traditional lenses. 3. Wide range of applications: It is commonly used in lighthouse illumination, solar concentrating power generation, projection displays, automotive lighting, infrared detection, and security monitoring. It is particularly advantageous in scenarios requiring large-aperture, lightweight optical components.