Fresnel Lens|Led lens|Trapezoid 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）

	Part No.	HX-FT12590
	Shape Properties	Trapezoid(A=topline,B=baseline,H=height)
	DIM  A,B,H (mm)	64,125,90
	Thickness (mm)	2.0
	Focal Length (mm)	90
	Groove Pitch (mm)	0.5
	Materials	Optical Grade PMMA
	2D Views
	Part No.	HX-FT88140
	Shape Properties	Trapezoid(A=topline,B=baseline,H=height)
	DIM  A,B,H (mm)	22,88,72
	Thickness (mm)	2.0
	Focal Length (mm)	140
	Groove Pitch (mm)	0.5
	Materials	Optical Grade PMMA
	2D Views
	Part No.	HX-FT15590
	Shape Properties	Trapezoid(A=topline,B=baseline,H=height)
	DIM  A,B,H (mm)	58,155,100
	Thickness (mm)	2.0
	Focal Length (mm)	90
	Groove Pitch (mm)	0.5
	Materials	Optical Grade PMMA
	2D Views
	Part No.	HX-FT155135
	Shape Properties	Trapezoid(A=topline,B=baseline,H=height)
	DIM  A,B,H (mm)	59,155,100
	Thickness (mm)	2.0
	Focal Length (mm)	135
	Groove Pitch (mm)	0.3
	Materials	Optical Grade PMMA
	2D Views

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