Cone shaped Fresnel reflector
AssigneeMinnesota Mining and Manufacturing Company
InventorKenneth A. Aho
Life of this patent
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Abstract
A Fresnel-type reflector having the physical shape of a cone. In a preferred embodiment, the reflector is made by forming a reflective coating on a structured surface of a thin flexible film and forming the film into the shape of a cone. The structures on the surface are designed to cause the reflector to imitate the optical properties of a parabolic reflector when the reflector of the invention is formed into the shape of a cone.
Claims32
A reflector apparatus comprising a reflector having a major surface, said major surface being reflective and having coaxial Fresnel-type structures thereon, said reflector being formed into the shape of a cone having a base.
A thin sheet of a flexible material having a major surface, said major surface being reflective and having concentric, Fresnel-type structures thereon, said sheet having a periphery which includes first and second edges radial to said Fresnel-type structures such that, when said edges are brought together, the sheet is formed into the shape of a cone having a base.
Dependencies are inferred from the claim text.