led fresnel, LM6704-025(F= 67.4 / 134.8), fresnel lighting
With large reflection angle of the LED point lamp-house,the emanative ray spreads the heat and compares severity, making use of the Fresnel lens to gather the light function. The rays will be gathered by using valid scope therefore increase light effect and maximize brightness result.
The Fresnel lens is differentiated from traditional LED lamp,in terms of the design of focal length and distance,which establishes the effective emergent light angle.
Compared to traditional products,the super thin structure of Fresnel lens enables improved light transmissibility,In addition,it could be applied for various purposes with its small and condensed product design.
Focal Length (mm) = 67.4/134.8
Groove Pitch (mm) :0.25
Thickness (mm) : 2
Material : PMMA
Type : LED
LED type Fresnel lens such as magnifiers, lighting equipment, 3D display is being used in a variety of areas.
Groove(Prism) on the opposite side condensing
(A flat surface condensing)
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
◈ Using a Fresnel lens solar concentrator
◈ Efficiency and F number
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%
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