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The application principle of Fresnel lens in projection system
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The application principle of Fresnel lens in projection system

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[Abstract]:
AFresnellensisabranchofalens.Comparedwithotherlenses,ithastheadvantagesofsmallsize,lightweightandcompactstructure.Ithasgoodconcentratingandimagingperformance,andisnotinferiortootherlenses,soitisdefens

A Fresnel lens is a branch of a lens. Compared with other lenses, it has the advantages of small size, light weight and compact structure. It has good concentrating and imaging performance, and is not inferior to other lenses, so it is defensive. Widely used in aviation, aerospace, industrial production and civil use.

An advantage of a Fresnel lens in a projection system is that it increases the brightness of the enhanced display by focusing or adjusting the light collimation. If the collimating lens is eliminated, the light will lose a lot when passing through the panel, and significant heat will appear on the display. The dot effect reduces the brightness around the display. In addition, on the other side of the LCD screen, we must also focus the light from the panel into the projector lens. Increase the brightness of the Fresnel lens before viewing the screen.
Projector display
  Fresnel lenses have proven to be the preferred application in projection systems, and their role is to collimate and focus light. The Fresnel lens adjusts the beam source from the source to parallel light, which significantly increases the brightness around the display panel, eliminating the sun spot effect and improving overall display brightness uniformity. Fresnel lenses are commonly used with other display elements, such as cylindrical mirrors.
An advantage of a Fresnel lens in a projection system is that it increases the brightness of the enhanced display by focusing or adjusting the light collimation. If the collimating lens is eliminated, the light will lose a lot when passing through the panel, and significant heat will appear on the display. The dot effect reduces the brightness around the display. In addition, on the other side of the LCD screen, we must also concentrate the light from the panel into the projection lens.
The positive focal length lens forms a virtual upright image. The Fresnel Magnifier is an ultra-thin magnifying glass. Made of transparent plexiglass (of course there are more materials). The Fresnel magnifier is made of PVC and has a minimum thickness of 0.45mm to 0.90mm. Unlike ordinary magnifiers, its surface is covered with tiny streaks and contains many convex lenses in its spiral stripe. Referring to the ring, the light passing through it is curved to create a diffraction phenomenon, thereby forming an enlarged image. Fresnel lenses are characterized by a higher brightness and flat surface than conventional lenses, as well as large areas of radiation. Usually, the diameter of a common meniscus lens is very limited, and Fresnel plays a very good role in the field of magnifying glass, which can not achieve the effect that ordinary ordinary lenses cannot achieve. Nowadays, the Fresnel magnifier is only 0.45mm thick and easy to carry. In fact, the main function is to reduce the weight of ordinary plexiglass and traditional glass loupe.