Decorative film, carton, and method of making
A paper box and packaging box technology, applied in the fields of decorative films, paper boxes and their production, can solve the problems of unprinted marks recording Fresnel lenses, printing opacity, etc.
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[0025] Figure 1A with 1B A cross-sectional view of an aspheric conventional lens 16 and a Fresnel lens 17 having the same focal length is shown. In general, positive focal length Fresnel lenses are almost universally plano-convex, having a flat surface 18 as shown and a jagged convex surface 19 . A positive focal length Fresnel lens converts a thicker aspheric lens into a much thinner lens with the same optical performance. In a Fresnel lens, the volume of material is reduced by taking out multiple coaxial annular cylinders 20 of material. In this way, the contour of the convex surface 19 of the aspheric lens is approximated by right cylindrical parts divided by conical parts with inclined surfaces 22 . When you run your fingernail across the jagged raised surface 19, the sloped surface feels like multiple grooves. The height of the cylinder 20 does not contribute to the optical properties of the lens, which allow Fresnel lenses to be made extremely thin compared to aspher...
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