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Turning film having variable pitch

  • US 20070019434A1
  • Filed: 07/22/2005
  • Published: 01/25/2007
  • Est. Priority Date: 07/22/2005
  • Status: Abandoned Application
First Claim
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1. A light-redirecting article having a width and a length, comprising:

  • a light-redirecting surface comprising a plurality of light-redirecting structures elongated along the length of the light-redirecting article and arranged side-by-side, wherein each light-redirecting structure comprises;

    (i) a first side surface oriented away from a normal to the light-redirecting article at a first angle;

    (ii) a second side surface oriented away from a normal to the light-redirecting article at a second angle, wherein the cross-sectional shape of each light-redirecting structure has at least one convex surface;

    wherein the first and second side surfaces meet at an apex; and

    wherein, for at least two adjacent light redirecting structures, over the length of the adjacent light redirecting structures the widthwise pitch between apexes of the adjacent light-redirecting structures varies by more than +/−

    3%.

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