Groove pitch 0.2mm, LARGE FRESNEL LENS, LF700-780, FL=700mm, 3D image, FL700-780
Description
LF700-780
Screen, large Phil pinch lens
Our company is improving our skills and systems of Diamond Turning Machine for
large size Fresnel lens.
We are one of world leading company of mold and large Fresnel lens. Base on
this technical advantage, we develop lenses for concentration, solar oven, integral
photonics and magnifier.
Focal Length (mm) : 700
Size (mm) : 780x780mm
Groove pitch(mm) : 0.2mm
Thickness(mm) : 5T
material : PMMA
Also we design to use more 3mm Optical PMMA for loner life time and to have 0.5 ~ 1.0mm groove pitch for higher solar concentration.
(If groove pitch is density, then quality of image that is maginifed is clearer.If groove pitch is width, then efficince of concentration of light is higher.)
◈ Refraction of light with Conve and Concave lens
◈ Cone lux diagram (50, 90, 120˚)
The basic functions of the lens to refract light, can spreading or condensing the light emitted from the light source.
Fresnel lens a lighter and thin than convex(concave) lens.
So, when the Fresnel lens used in lighting equipment to make a lighter, smaller apparatus.
◈ Fresnel lens concentration rate
Concentration rate is ratio between area of solar cell and area of Fresnel lens.
Ex) Fresnel lens size 120*120mm → area of lens is 14400mm2
Solar cell size 5*5mm → area of solar cell is 25mm2
Concentration rate is 14400/25 = 576 times
However because of transmittance rate and other obstructs, multiple 80% is reasonable.
Adjusted concentration rate is (14400*0.8)/25 = 460 times
◈ Efficiency and F number
F=focal legnth/Diameter
From F1.2, the efficency is dramatically droped. It shows there is a certain ratio between focal length of fresnel and diameter of lens.
Bigger size Lens is not always the answer.
◈ Comparing transmittance of SOG(Silicone On Glass) and PMMA
Our Optical PMMA has higher transmitive than glass, which is 92~95%, and absorption in visual ray is almost 0%
| We are happy to work with individual inventor and developing company. Custom Design is available. ※ Maximun capacity |
English webpage : www.FresnelFatory.com