Fresnel Lens|Solar energy condenser lens

Product Description

The Fresnel lens reduces the amount of material required compared to a conventional lens by dividing the lens into a set of concentric annular sections. An ideal Fresnel lens would have infinitely many such sections. In each section, the overall thickness is decreased compared to an equivalent simple lens. This effectively divides the continuous surface of a standard lens into a set of surfaces of the same curvature, with stepwise discontinuities between them. In some lenses, the curved surfaces are replaced with flat surfaces, with different angle in each section. Such a lens can be regarded as an array of prisms arranged in a circular fashion, with steeper prisms on the edges, and a flat or slightly convex center. In the first (and largest) Fresnel lenses, each section was actually a separate prism. 'Single-piece' Fresnel lenses were later produced, being used for automobile headlamps, brake, parking, and turn signal lenses, and so on. In modern times, computer-controlled milling equipment (CNC) might be used to manufacture more complex lenses. Fresnel lens design allows a substantial reduction in thickness (and thus mass and volume of material), at the expense of reducing the imaging quality of the lens, which is why precise imaging applications such as photography still use conventional bulky lenses. Fresnel lenses are usually made of glass or plastic; their size varies from large (old historical lighthouses, meter size) to medium (book-reading aids, OHP viewgraph projectors) to small (TLR/SLR camera screens, micro-optics). In many cases they are very thin and flat, almost flexible, with thicknesses in the 1 to 5 mm (0.039 to 0.20 in) range.

Datasheet Of Fresnel Lenses

（Focal length is constant,the size can be from large to small,so many specifications can be derived）

No.	Part No.	Diameter (mm)  Square	Focal Length (mm)	Thickness (mm)	Groove Pitch (mm)
1	HX-FS90	90*90	90	2	0.3
2	HX-FS120A	183*110	120	2	0.3
3	HX-FS120B	120*94	120	2	0.3
4	HX-FS140	140*100	140	2	0.3
5	HX-FS160	183*110	160	2	0.3
6	HX-FS170	200*170	170	2	0.3
7	HX-FS180	183*110	180	2	0.3
8	HX-FS185	183*110	185	2	0.3
9	HX-FS190	150*150	195	2	0.3
10	HX-FS210A	270*270	210	2	0.3
11	HX-FS210B	300*300	210	2	0.3
12	HX-FS220	280*280	220	2	0.3
13	HX-FS310A	270*270	310	2	0.3
14	HX-FS310B	300*300	310	2	0.3
15	HX-FS320A	300*300	320	2	0.3
16	HX-FS320B	240*360	320	2	0.3
17	HX-FS330A	350*350	330	2	0.3
18	HX-FS330B	240*360	330	2	0.3
19	HX-FS350	345*345	350	2	0.3
20	HX-FS370A	260*260	370	2	0.3
21	HX-FS370B	350*350	370	2	0.3
22	HX-FS510A	400*300	510	2	0.5
23	HX-FS510B	240*360	510	2	0.5
24	HX-FS600	400*300	600	2	0.5
25	HX-FS620A	500*500	620	3~5	0.8
26	HX-FS620B	520*520	620	3~5	0.8
27	HX-FS720A	800*720	720	3~5	1
28	HX-FS720B	800*800	720	3~5	1
29	HX-FS890	900*900	890	5	1
30	HX-FS980	1400*700	980	5	1
31	HX-FS1300	1100*1100	1300	5	1
32	HX-FS1500	1200*1100	1500	5	1
33	HX-FS1800	1000*1000	1800	5	1

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