Multi-directional light control film
AssigneeMinnesota Mining and Manufacturing Company
InventorPeter A. Bellus
Life of this patent
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Abstract
A light control film includes a light transmissive matrix sheet and a plurality of opaque aciculae disposed throughout the sheet and oriented such that the longitudinal axis of each of the acicula is generally perpendicular to the face of the sheet.
Claims12
A light control film having a sharp cutoff angle comprising a plurality of magnetically alignable aciculae having aspect ratios in the range of 2,500 to 100,000:1 fixedly disposed within a solidified resin matrix, said resin matrix being light transmissive material and thermoplastic or thermoset, said aciculae having their major axes generally aligned in parallel within said matrix.
A multi-directional light control film having a sharp cutoff angle comprising:
- a matrix of generally light transmissive material;
- a plurality of magnetically alignable aciculae having aspect ratios in the range of 2,500 to 100,000:1 fixedly disposed within said matrix;
- and
- wherein the film comprises a first region, having aciculae oriented in a generally parallel arrangement with each other and at a first angle to a plane of the film;
- and a second region having aciculae oriented in a generally parallel arrangement with each other and at a second angle to the plane of the film, said second angle being different from said first angle.
Dependencies are inferred from the claim text.