Product Description:Fresnel lens, also known as threaded lens, is mostly a thin sheet made of polyolefin material, and also made of glass. One side of the lens surface is smooth, and the other side is engraved with concentric circles from small to large. , its texture is designed according to light interference, interference radiation, relative sensitivity and receiving angle requirements.
Product principle: Assuming that the refracted energy of a lens occurs only at the optical surface, remove as much optical material as possible while preserving the curvature of the surface. Another understanding is that the continuous surface portion of the lens "collapses" into a plane. In section, its surface consists of a series of zigzag grooves, and the central part is an elliptical arc. Each groove has a different angle from the adjacent groove, but all focus the light in one place to form a central focus, which is the focal point of the lens. Each groove can be regarded as an independent small lens, adjusting the light into parallel light or concentrated light. This lens is also able to eliminate some spherical aberrations.
Product features: When using ordinary convex lenses, the corners will be darkened and blurred. This is because the refraction of light only occurs at the interface of the medium. The convex lens sheet is thicker, and the part where the light travels in a straight line in the glass will attenuate the light. If you can remove the straight-line propagating part and keep only the curved surface where the refraction occurs, you can save a lot of material and achieve the same light-gathering effect. The Fresnel lens is based on this principle. The Fresnel lens looks like a piece of glass with countless concentric circles (that is, Fresnel strips), but it can achieve the effect of a convex lens. If the projection light source is parallel light, it can maintain the same brightness everywhere in the image after converging projection. .
Product category: 1. The design is divided into: 1.1 Positive Fresnel lens: Light enters from one side, passes through the Fresnel lens and exits on the other side, focused into a point or emitted as parallel light. The focal point is on the other side of the ray and is finitely conjugated. This type of lens is usually designed as a collimating lens (such as a Fresnel lens for projection, a magnifying glass) and a condenser (such as a Fresnel lens for concentrating light and heat for solar energy).
1.2 Negative Fresnel lens: Contrary to the positive Fresnel lens, the focal point and the light are on the same side, and the surface is usually coated as the first reflecting surface.
Main Cooperation Materials Manufacturers: CORNING, OHARA, SCHOTT, LEONI, AGC,HELLMA, NIKON,VITRON,C-LASER,ETC
Main Export Countries & Areas: Usa, Uk, Japan, Germany, Spain, France, Swiss, Korea, Russia, Pakistan, India, Portugal, Canada, New Zealand, Australia, Saudi Arab, Turkey, Finland, Poland ,etc.
Raytekoptics Extra value added services offered: 1). Optical workcraft & process solution design; 2). Rough processing raw materials; 3). Semi finishing raw materials; 4). Fabricate custom sizes and shapes; 5). Design and supply custom coatings; 6). Modify and resurface customer supplied materials; 7). Drill holes, notch glass and provide beveled substrates; 8). Precision polish optics with non-standard aspect ratios;
Payment Method: by T/T or Western Union. Delivery time: 7-10 days. Quality Warranty: Ruitaiphotoelectric(Raytekoptics) offersquality warranty for our optics products with "3R" policy. For any inferior-quality products, Ruitaiphotoelectric(Raytekoptics) is responsible for return, replacement and refund.
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