What is Fresnel Lens?
Fresnel lenses are portable and lightweight sheets used for light gathering or magnifying. The frensel lens was first invented by a French physicist namely Augustin-Jean Fresnel. Augustin Fresnel first used this lens design to build a glass Fresnel lens - lighthouse lens in 1822.
Unlike typical spherical or aspherical optical lenses, fresnel lenses are composed of a series of concentric grooves etched into one side of a sheet of plastic. A fresnel lens is a thin, flat optical lens which consists of a series of a series of small narrow concentric grooves on the surface of a lightweight plastic sheet in order to reduce the thickness, weight and cost. Each groove is at a slightly different angle than the next and with the same focal length in order to focus the light toward a central focal point. Every groove can be considered as an individual small lens to bend parallel Fresnel light waves and focus the light. The lens actually eliminates some spherical aberration.
The Fresnel lens is a special optical lens. lt can now be made from plastic such as acrylic fresnel lens, PMMA, polyvinyl cholride (PVC), polycarbonate (PC) and HDPE. A traditional glass convex lens would be thick, heavy and very expensive, but a plastic Fresnel lens is a thin, flat, lightweight and low cost alternative.
A high groove density has a better quality projection image. The Fresnel lens is a good solution for quality image and efficiency at a significantly lower cost. The Fresnel lens is usually corrected for spherical aberration.
Application of Fresnel Lens
Types of Fresnel Lenses
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.
Advantages of Fresnel Lens
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.
Design of Fresnel Lens
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.
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The Custom Bookmark Magnifying Sheet is 3-in-1 features, a bookmark with magnifier and ruler. An good ideal for promotional bookmark magnifier product specially for bible reading, these bookmark magnifying sheet would also be perfect for schools, retirement communities and hospitals.The metric ruler measures up to 6" while the magnifier has a 4X magnification.
3X Credit Card Wafer-Thin Magnifier very suitable as a promotional gift that is easy to keep handy and use daily. Credit card size lens magnifier to read can fit into wallet. Card fresnel lens magnifier use for reading small print of menu, directions etc. Size and other designs can be modified to fit your needs.Very convenience to read the small print when you forget to bring the glasses. Magnify your profits by adding your logo to credit card size magnifiers. Personalized with your business advertising on card magnifier. Best price ever have than anyone in the planet.
Clear full page fresnel sheet magnifier 3X power. The page magnifier is light weight plastic magnifier sheet made by fresnel sheet can be used for general magnification. Useful for quick reading small text or newspaper..etc. The large reading fresnel magnifiers are also excellent solar concentrators. The 3X full page magnifying glass produces instant magnification of an entire page quickly and easily. This lightweight page magnifier for reading offers the same quality as a similarly sized, conventional lens without the bulky volume.
Rigid full page magnifier with 3x magnification power acrylic fresnel lens give magnification on full entire page and you don't need to move the magnifier when you read it and can see the whole page. This full page magnifier is a specially molded fresnel acrylic lens lets you read an entire page of print with considerable ease. This strong and unbreakable acrylic lens include optical grade provides optimum image quality and fresnel technology that allows magnifying lens to be much thinner, making it lightweight, easier to hold and maneuver.
Wooden frame jumbo size foldable 3x magnification hands free magnifier as seen on TV. Wooden table stand hands free reading magnifier wooden frame with acrylic lens. It fits over any book size for large viewing area.Wooden foldable hands free Magnifier comes with a collapsible wooden frame table stand and a 3X page magnifier sheet to make it the perfect reading or embroidery, stamp collecting, handicrafts, etc.
A4 Full Page Large Hands Free Magnifying Glass Lens For Reading with Cord has 2-in-1 design - Hest-hung and desktop types, convenient and practical, so that your hands can freely concentrate on details. Foldable page magnifier with very clear magnification for most of a page. Hands free chest rest LED reading magnifier - Neck wear visual aid illuminated magnifying glass for reading or embroidery, 3X large wide horizontal stand magnifying glass with light with 4 Ultra Bright Built-in LED light.