What is the difference between an optical lens and a Fresnel lens

The optical lens is relatively thick and heavy, and the size is small; the Fresnel lens is light and thin, and the size is large.

The principle of Fresnel lens was invented by the French physicist Augustin Fresnel, which converts spherical and aspheric lenses into thin and light flat-shaped lenses to achieve the same optical effect, and then through ultra-precision processing In this way, a large number of optical grade ring belts are processed on the flat surface, and each ring belt plays an independent lens role. Fresnel lens is the best way to realize the large-scale, flattened, thinned lens.

Fresnel lens is a flat plate shape, which realizes the function of reflecting and converging rays. Using this principle and splicing technology, it is possible to convert parabolic, ellipsoidal, and high-order curved optical lenses of any caliber into a plane form, so as to realize the splicing of Fresnel lenses of any size, and explore the use of solar energy in space and giant reflective surfaces (such as Guizhou Skyeye 500). Meter diameter radio telescope) and other applications.

The infinite splicing technology of Fresnel lens can use this splicing technology from a few meters to hundreds of meters to any large size. The parabolic reflector in Guizhou Tianyan with a diameter of 500 meters can use this splicing technology with a flat surface. The Fresnel lens simulates a parabola, which reduces the difficulty of processing and is easier to install and adjust.