What is Fresnel lens



Fresnel lenses are portable and lightweight sheets used for collecting or enlarging light. The Fresnel lens was first invented by a French physicist, Augustine-Jean Fresnel. Augustine Fresnel first used this lens design to build a glass Fresnel lens.

Unlike typical spherical or a spherical optical lens, Fresnel lenses are composed of a series of concentric grooves engraved on one side of a plastic sheet. 

A Fresnel lens is a thin and flat optical lens which consists of a series of small concentric grooves narrow on the surface of a light plastic sheet to reduce thickness, weight and costs. 

Each groove has a slightly different angle than the next and with the same focal length to focus the light towards a central focal point. Each groove can be thought of as a single small lens to bend parallel Fresnel light waves and focus the light. The lens actually eliminates some spherical aberrations.

The Fresnel lens is a special optical lens. Now it can be made of plastic such as acrylic Fresnel lens, PMMA, polyvinyl collide (PVC), polycarbonate (PC) and HDPE. A traditional glass convex lens would be thick, heavy and very expensive, but a Fresnel plastic lens is a thin, flat, light and low-cost alternative.


Applications for Fresnel lenses include 3D lens, lighting, Fresnel lamp, headlight, overhead projector, magnifier, TV projection, condenser system, car headlight, rear projection screen, passive motion detector, road sign, solar concentrator, collimator, flight simulator and LED magnifier.


The significantly reduced lens thickness translates into significant savings in material cost. Fresnel lenses can reduce weight, reducing assembly and mounting costs. 

Extremely giant Fresnel lenses up to 1000mm can be used to replace a group of very expensive conventional mirrors in large optical systems.

Magnification 3x entire page with black border magnification. It is considered the most convenient magnification for reading small prints, ideal for viewing and controlling small materials for hobbies and crafts, small parts of electronic gadgets such as screws and pins.

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