Fresnel lens, a succession of concentric rings, each consisting of an element of a simple lens, assembled in proper  relationship on a flat surface to provide a short focal length. The Fresnel lens is widely used in our daily life as light collector and fire starter. Particularly in lighthouses and searchlights to concentrate the light into a relatively narrow beam. 

FIELD LENSES (FRESNEL SCREEN 'BRIGHTENERS")

A Fresnel lens can be used to redirect the light at the edges of a frosted rear-projection display screen toward the viewer's eyes, thus eliminating the "hot spot" often observed in such screens by brightening the edges of the display.  Screens of this type include camera focusing screens.  The grooves must face the light source in this application; the grooves often must therefore face the shorter conjugate, an exception to the usual rule.

Conjugates for the field lens should be the distance from the projector lens on the grooved side, and the distance to the viewer on the frosted sdie.  E-Tay Industrial Co., Ltd. can supply suitable lenses with the plano side either optically polished or frosted. 

Types of Fresnel lens : positive Fresnel lens, negative Fresnel lens, Fresnel lens array, cylindrical Fresnel lens, circular Fresnel lens, linear Fresnel lens, lenticular Fresnel lens, diffraction Fresnel, Fresnel reflection, Fresnel beamsplitter and Fresnel prism.

The Fresnel lens can be designed and manufactured in very large sizes with light weight due to less than 4mm thickness, so the cost will be lower than traditional magnifiers. ln contrast, a conventional glass lens would be 200mm thick at the edge, weigh over 50kgs and cost thousand of dollars.

Significantly reduced lens thickness results in a substantial savings in material cost. Fresnel lenses can reduce weight, which reduces mounting and assembly cost. Extremely giant Fresnel lens up to 1000mm can be used to replace a very expensive conventional mirror assemblies in large optical systems.

Full page 3x magnifying sheet with black border magnify up to 300%. It is considered the most comfortable magnification for reading small prints, ideal for Viewing and checking tiny hobby and crafting materials, small electronic gadget parts such as screws and pins.

To determine the optical Fresnel lens design equation, all of the parameters are determined for each individual application. Several Fresnel zone formulas are used in Fresnel technologies for precision diamond tooling machines and electroforming and molding processes.

To determine the optical Fresnel lens design equation, all of the parameters are determined for each individual application. Several Fresnel zone formulas are used in Fresnel technologies for precision diamond tooling machines and electroforming and molding processes.