Abstract: An optical filter includes an array of light-transmissive beads in a matrix of light absorbing binder that surrounds one portion of the beads to provide light entrances and exit apertures for incident light to pass substantially only through the beads. A transparent layer under the light absorbing layer may serve to increase the diameter of the exit apertures. A structure or layer of light-dispersing material that exhibits anisotropic dispersion of incident light along orthogonal axes is disposed relative to the beads to disperse light within a wider output angle along one of the orthogonal axes than along another of the orthogonal axes.

Abstract: High spatial frequency optical noise in the form of intensity contrasting picture elements in the display of a projected light image on a bead-oriented image-enhancing filter is significantly reduced by interposing light-scattering material in the optical path between a source of the projected light image and the display in order to inhibit formation and interference of coherent light waves, and to mask the appearance of separate or discrete beaded apertures.

Abstract: Method and apparatus for collimating light of projected images establishes limited few designs of Fresnel lenses to accommodate conventional image projection system having a wide range of sizes of viewing screens for the projected images. A multi-layer image-enhancing filter is disposed to receive substantially collimated image light exiting the Fresnel lens. A light-transmissive structure includes a substrate layer supporting a single layer of contiguously-arranged beads of light transmissive material disposed on an incident surface of the substrate layer. A Fresnel lens includes angularly-pitched segments on one surface and an array of a plurality of elongated lenses aligned in one direction on an opposite surface of the Fresnel lens for passing a projected light image therethough to the layer of beads on the substrate layer.

Abstract: High spatial frequency optical noise in the form of intensity contrasting picture elements in the display of a projected light image on a bead-oriented image-enhancing filter is significantly reduced by interposing light-scattering material in the optical path between a source of the projected light image and the display in order to inhibit formation and interference of coherent light waves, and to mask the appearance of separate or discrete beaded apertures.

Abstract: Method and apparatus for collimating light of projected images establishes limited few designs of Fresnel lenses to accommodate conventional image projection systems having a wide range of sizes of viewing screens for the projected images. A multi-layer image-enhancing filter is disposed to receive substantially collimated image light exiting the Fresnel lens. A light-transmissive structure includes a substrate layer supporting a single layer of contiguously-arranged beads of light transmissive material disposed on an incident surface of the substrate layer. A Fresnel lens includes angularly-pitched segments on one surface and an array of a plurality of elongated lenses aligned in one direction on an opposite surface of the Fresnel lens for passing a projected light image therethrough to the layer of beads on the substrate layer.

Abstract: Method and apparatus for collimating light of projected images establishes limited few designs of Fresnel lenses to accommodate conventional projection systems having a wide range of sizes of viewing screens for the ted images. A multi-layer image-enhancing filter is disposed to receive Substantially collimated image light exiting the Fresnel lens.

Abstract: Method and apparatus for collimating light of projected images establishes limited few designs of Fresnel lenses to accommodate conventional image projection systems having a wide range of sizes of viewing screens for the projected images. A multi-layer image-enhancing filter is disposed to receive substantially collimated image light exiting the Fresnel lens.

Abstract: A venetian blind slat or coil of venetian blind slat substrate, such as aluminum, is first coated with a conductive primer. An anti-static conductive coated is applied thereover. The resultant coated finished blind slat and its associated spaced horizontal slats have sufficient conductivity to resist airborne dust particle accumulation with reductions in dust accumulation of from 36% to about 82% being attained, as compared to colored paint insulative coating on standard venetian blinds. An inorganic, inert conductive additive such as stannous oxide is employed in the anti-static conductive coating, resulting in coating conductivities of less than 10.sup.6 ohms per square and, in a preferred embodiment, from about 10 ohms per square to 10.sup.5 ohms per square.