This disclosure generally relates to retroreflective articles and methods of making such articles.

This disclosure generally relates to retroreflective articles and methods of making such articles.

The disclosed aliphatic thermoplastic polyurethane composition is well suited for use in thin, flexible light directing articles to impart flexibility, toughness, or protection to the light directing articles that contain optically active elements. The disclosed aliphatic thermoplastic polyurethanes have improved thermostability at higher temperatures. Specifically, the disclosed aliphatic thermoplastic polyurethanes have a cross-over temperature greater than 110° C. In one embodiment, the cross-over temperature is greater than 130° C. In one embodiment, the cross-over temperature is less than 170° C. and a Tg greater than 35° C. and less than 70° C.

The disclosed aliphatic thermoplastic polyurethane composition is well suited for use in thin, flexible light directing articles to impart flexibility, toughness, or protection to the light directing articles that contain optically active elements. The disclosed aliphatic thermoplastic polyurethanes have improved thermostability at higher temperatures. Specifically, the disclosed aliphatic thermoplastic polyurethanes have a cross-over temperature greater than 110° C. In one embodiment, the cross-over temperature is greater than 130° C. In one embodiment, the cross-over temperature is less than 170° C. and a Tg greater than 35° C. and less than 70° C.

A retroreflective sign comprising a rigid substrate with a pattern of cell walls formed of a polyurethane adhesive or two-part polyurea adhesive, and a polymeric sheet having a front face and a rear face, the rear face facing the substrate, the rear face comprising microprismatic reflective elements is disclosed. The polymeric sheet is adhered directly to the cell walls formed of the polyurethane adhesive or two-part polyurea adhesive while leaving an air gap between the microprismatic retroreflective elements and the rigid substrate in the cells. A method of making the retroreflective sign includes applying a polyurethane adhesive or two-part polyurea adhesive to a front side of a rigid substrate in a pattern defining cell walls; and prior to full curing of the polyurethane adhesive, laminating the front side of the rigid substrate a rear side of a polymeric sheet via the cell walls, the polymeric sheet comprising microprismatic elements.

A beam splitterreflects a portion of light emitted from a first image projector in a first direction while allowing another portion of the light to transmit in a second direction. A first retroreflectorretroreflects the light reflected in the first direction toward the beam splitter. A second retroreflectorretroreflects the light transmitted in the second direction toward the beam splitter. The beam splitterallows the light retroreflected by the first retroreflectorto transmit toward an imaging opticswhile reflecting the light retroreflected by the second retroreflectortoward the imaging optics.

A LED panel wherein a plurality thereof are employed to construct a LED volume for filing simulated virtual environments wherein the LED panel of the present invention provides tracking of objects in the vicinity thereof such as but not limited to a camera wherein the tracking elements do not require post production removal. The LED panel includes a housing having a perimeter frame that has a transparent LED display mounted thereto. On the rear surface of the LED display or proximate thereto are a plurality of retroreflectors. The retroreflectors function to provide inside-out tracking of a camera disposed within the LED volume. The present invention further includes a plurality of lidar sensors and optical sensors mounted to the perimeter frame. The lidar sensors and optical sensors provide data for outside-in tracking of a camera within the LED volume. The retroreflectors can be provided in multiple alternate embodiments.

A LED panel wherein a plurality thereof are employed to construct a LED volume for filing simulated virtual environments wherein the LED panel of the present invention provides tracking of objects in the vicinity thereof such as but not limited to a camera wherein the tracking elements do not require post production removal. The LED panel includes a housing having a perimeter frame that has a transparent LED display mounted thereto. On the rear surface of the LED display or proximate thereto are a plurality of retroreflectors. The retroreflectors function to provide inside-out tracking of a camera disposed within the LED volume. The present invention further includes a plurality of lidar sensors and optical sensors mounted to the perimeter frame. The lidar sensors and optical sensors provide data for outside-in tracking of a camera within the LED volume. The retroreflectors can be provided in multiple alternate embodiments.

The present invention relates to a combined phosphorescent, retroreflective and fluorescent article comprising a substrate, a phosphorescent layer on at least one side of the substrate and a retroreflective and fluorescent sheet provided over the phosphorescent layer, wherein the retroreflective and fluorescent sheet is configured so that at least 5% of visible area of said one side is phosphorescent.

The present invention relates to a combined phosphorescent, retroreflective and fluorescent article comprising a substrate, a phosphorescent layer on at least one side of the substrate and a retroreflective and fluorescent sheet provided over the phosphorescent layer, wherein the retroreflective and fluorescent sheet is configured so that at least 5% of visible area of said one side is phosphorescent.