Abstract:
Dual axis retroreflective articles that combine dual axis retroreflection and three axis retroreflection to provide a steady glow due to the three axis retroreflective portions of the article and also provide intermittent or flashing retroreflection as the plane of retroreflection from the dual axis retroreflector passes through or near the light source. The retroreflective articles may also include dual axis retroreflective structures in combination with sparkling reflective structures, as well as dual axis retroreflective structures in combination with both three axis retroreflective structures and sparkling reflective structures. Methods of use include moving the dual axis retroreflective structures to obtain intermittent or flashing retroreflection.
Abstract:
Sheeting material is disclosed that contains a retroreflective layer and a layer of luminescent material on the upper surface of the retroreflective layer. The sheeting material can be formed into signage or decorative articles that are highly visible under a variety of lighting conditions. A portion of the retroreflective layer is visible through the luminescent layer or through one or more openings in the luminescent layer which are in the form of slits, perforations, alphanumeric or other patterns. The luminescent layer can be imaged using analog or digital printing processes. The sheeting material can be made from materials that are suitable for back-lit illumination. Adhesives or other conventional attachment means can be employed to anchor the signs in interior or exterior environments.
Abstract:
Electroluminescent retroreflective article comprising: (a) a retroreflective member comprising (1) a cube corner member having a front surface and a back surface, the back surface having a plurality of cube corner elements protruding therefrom and (2) a seal film bonded to the back surface having a first surface oriented toward the cube corner elements and a second surface oriented away from the cube corner elements; and (b) and electroluminescent element bonded to the second surface of the seal film such that the electroluminescent element emits light incident to the seal film.
Abstract:
A retroreflective article that exhibits high retroreflective efficiency in response to light incident on the sheeting at high angles of incidence is disclosed. A retroreflective article includes a body portion having a base surface and a structured surface opposite the base surface. The structured surface includes a plurality of retroreflective cube corner elements defined by two intersecting groove sets. Each cube corner element has three tetragonal optically reflective faces that intersect to define a cube corner apex and two tetragonal non-optical faces that intersect along an edge. The symmetry axes of the cube corner elements are substantially parallel.
Abstract:
A retroreflective structure includes an outer layer having a first transparent plastic layer having a fluorescent colorant and a second transparent plastic layer having a non-fluorescent colorant which is significantly more stable to prolonged exposure to ultraviolet light than the fluorescent colorant. The second transparent plastic layer is bonded to the first transparent plastic layer. An array of retroreflective elements is bonded to the top layer. An inner layer is bonded to a second side of the array of retroreflective prism elements.
Abstract:
A self-contained lighted marking device (18) that is a directionally dependent line light source has a substantially transparent housing (12). The housing (12) has a narrow cross section, preferably rectangular in shape. A thin, flexible film (14) having a smooth surface on one side and a plurality of linear substantially right angled isosceles prisms on the other side is located along the periphery of the interior of the housing (12). A light source, preferably a plurality of light emitting diodes (16), is located at at least one end of the housing (12).
Abstract:
A cube corner article and method of manufacturing the article from a series of unitary substrates. The method of manufacture comprises the first step of providing an initial non-unitary cube corner element array comprising a plurality of geometric structures including cube corner elements (212, 218). Then, a replica of the cube corner element array is produced as a substrate suitable for forming retroreflective surfaces. Portions of the replica substrate material are removed. The removal of these portions forms at least one cavity (206) bounded by side walls in the replica at a depth at least that of the cube corner elements. The replica is replicated to produce an additional directly machinable substrate suitable for forming retroreflective surfaces. The substrate comprises at least one raised section (208) having sidewalls at a height at least that of the cube corner elements. At least one raised section is directly machined to form a zone comprising a plurality of geometric structures including cube corner elements bounded by at least two sets of parallel grooves.
Abstract:
A method of machining a substrate to produce a cube corner element optical array (12). The method includes steps of directly machining a plurality of groove sets (14, 16, 20) into a directly machinable substrate to form an array having a plurality of geometric structures including cube corner elements (24, 26, 30), and machining at least two of the groove sets along the same path in the substrate but at different depths of groove to produce a geometric structure side surface having both an optical portion and a non-optical portion.
Abstract:
A cube corner article and method of manufacturing the article from a series of directly machinable unitary substrates (140). The method of manufacture comprises the first step of providing an initial unitary directly machinable substrate of material suitable for forming retroreflective surfaces. Then, a first cube corner element array zone (142) is formed having a plurality of geometric structures including cube corner elements. The zone is created by directly machining at least two sets of parallel grooves in the substrate. A replica of the cube corner element array zone is formed as an additional unitary substrate suitable for forming retroreflective surfaces. Portions of the replica substrate material are removed. The removal of these portions forms at least two intersecting cavities bounded by side walls in the replica at a depth at least that of the cube corner elements formed by the groove sets. Each cavity comprises at least one side wall which extends to a depth into the replica substantially equal to the deepest depth of any other intersecting cavity.
Abstract:
A triangular pyramidal cube corner type retroreflective sheet formed of triangular pyramidal cube corner type retroreflective elements useful for signs, such as a road sign and a construction work sign, license plates of vehicles, such as an automobile and a motorcycle, clothes, safety materials, such as a life-saving appliance, signboards, and reflective boards for visible light, laser beam or infrared ray reflective sensors. This retroreflective sheet is characterized in that an inclined surface ( c surface) using as one side thereof a base x of a triangular pyramidal reflective element sharing one base x on a bottom surface X-X' and arranged on the bottom surface in an opposed and maximally dense state has a pentagonal shape; the other two surfaces ( a surface and b surface), which share one ridge extending from an apex H of the triangular pyramidal reflective element, having a quadrangular shape; a height h from the apex H to the bottom surface X-X' being substantially larger than that h' from the apex H to a substantially horizontal plane (imaginary surface Z-Z') including bases z , w of the other inclined surfaces ( a surface and b surface) of the triangular pyramidal reflective elements.