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)  Round	Focal Length (mm)	Thickness (mm)	Groove Pitch (mm)
1	HX-F13	28.5	13	1	0.3
2	HX-F16	30	16	2	0.3
3	HX-F18	18	18	1	0.3
4	HX-F28A	45	28	1.2	0.2
5	HX-F28B	50	28	2	0.2
6	HX-F40	50	40	2	0.3
7	HX-F43	100	43	2	0.3
8	HX-F50	130	50	2	0.3
9	HX-F60A	70	60	2	0.3
10	HX-F60B	100	60	2	0.3
11	HX-F68A	70.3	68	2	0.3
12	HX-68B	74	68	2	0.3
13	HX-F70	80	70	2	0.3
14	HX-F80	90	80	2	0.3
15	HX-F90	250	90	2	0.3
16	HX-F100	200	100	2	0.3
17	HX-F130	220	130	2	0.3
18	HX-F140	200	140	2	0.3
19	HX-F150	170	150	2	0.3
20	HX-F195A	155	195	2	0.3
21	HX-F195B	220	195	2	0.3
22	HX-F200A	150	200	2	0.3
23	HX-F200B	200	200	2	0.3
24	HX-F200C	260	200	3	0.3
25	HX-F220A	200	220	3	0.3
26	HX-F220B	300	220	3	0.3
27	HX-F240	200	240	2	0.3
28	HX-F260	300	260	3	0.3
29	HX-F410	280	410	2	0.3
30	HX-F450	380	450	3	0.3
31	HX-F480	420	480	3	0.3
32	HX-F540	490	540	3	0.3
33	HX-F2000	950	2000	5	1

Next：90degree Luxeon Rebel LED Lens Previous：Fresnel Lens|Solar energy condenser lens