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Turning film having multiple slopes

  • US 7,957,082 B2
  • Filed: 10/03/2007
  • Issued: 06/07/2011
  • Est. Priority Date: 10/03/2007
  • Status: Expired due to Fees
First Claim
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1. A light redirecting article for redirecting light toward a target angle, the light redirecting article comprising:

  • (a) an input surface comprising a plurality of light redirecting structures each light redirecting structure having;

    (i) a near surface having two slopes, sloping away from normal in one direction as defined by a first inclination base angle β

    1, a second inclination angle β

    2, and a first half apex angle α

    2, for accepting incident illumination over a range of incident angles;

    (ii) a far surface sloping away from normal, in the opposite direction relative to the near surface, as defined by a second base angle γ

    1 and a second half apex angle α

    1; and

    (b) an output surface opposing to the input surface wherein the near and far surfaces are opposed to each other at an angle (α

    1

    2) that is in the range from 60 to 70 degrees, and the base angle β

    1 is in the range from 82 to 87 degrees.

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