Fresnel Lenses

Description

Introduction of Bote Fresnel Lenses

Fresnel lens, also known as threaded lens, is a lens invented by French physicist Augustin Fresnel. This design was originally used in lighthouses.

This design can build lenses with larger apertures, which are characterized by shorter focal lengths, less material, and smaller weight and volume than ordinary lenses.

Fresnel lenses are thinner than earlier lenses and therefore can transmit more light, making lighthouses visible even from considerable distances.

The design of the Fresnel lens allows for significant reductions in lens thickness (as well as weight and volume), but the price paid is a decrease in image quality, which is why precision imaging instruments such as SLR cameras and digital cameras still use traditional bulky lenses.

Fresnel lenses are often made of glass or plastic and range in size from large (old-fashioned lighthouses, with dimensions in meters) to medium (reading loupes, slide projections) to small (SLR camera focusing screens, microscopic optics). In most cases, they are thin, flat, and flexible, about 3-5 mm thick.

Application

• Inexpensive Fresnel lenses are generally die-cast or molded from clear plastic and are used in lenticular projectors, rear-projection TVs, and portable magnifiers.
• It is also used in traffic lights.
• Fresnel lenses are also used to correct some visual impairments, such as strabismus.
• Since plastic fresnel lenses can be made larger than glass, lighter and more economical, they have been used in solar cookers to collect sunlight or in solar water heaters.
• Fresnel lenses are very suitable for use in film production, not only because the light passing through them is brighter than through ordinary lenses, but also because the brightness of the entire beam of light passing through it is relatively consistent in all parts.
• Fresnel lenses are most widely used in car headlights, car taillights, and reversing lights.

Feature of Bote Fresnel Lenses

• Positive Focal Length
• Square and Rectangular Options
• Ideal for Light Gathering Applications