The present system provides a lightweight fire-resistant photoluminescent identifier system for firefighters, which is suitable for use on the firefighter's facemask, as well as other equipment. The system is lightweight and provides individual recognition of an individual firefighter. The identifier system lights up automatically in a low-light environment without batteries, yet prevents glare to the firefighter using the system. The components that comprise the system are fire-resistant to temperatures up to and exceeding 500 degrees Fahrenheit to facilitate personal recognition of the individual in dark and low-light areas.

The present system provides a lightweight fire-resistant photoluminescent identifier system for firefighters, which is suitable for use on the firefighter's facemask, as well as other equipment. The system is lightweight and provides individual recognition of an individual firefighter. The identifier system lights up automatically in a low-light environment without batteries, yet prevents glare to the firefighter using the system. The components that comprise the system are fire-resistant to temperatures up to and exceeding 500 degrees Fahrenheit to facilitate personal recognition of the individual in dark and low-light areas.

A variable traffic safety sign is useful in informing road users of the possibility of a surface of a road or bridge section being wet or frozen without using an additional external power source by exactly expressing freezing and wet roadbed conditions of the road or bridge section using a thermochromic paint and a humidity indicator paint, and also allowing road drivers to exactly recognize the roadbed conditions of the road or bridge section by displaying the freezing and wet roadbed conditions of the road or bridge section conditions in response to changes in temperature and humidity, respectively. Also, the variable traffic safety sign is readily applicable to structures such as a bridge crash barrier, a traffic safety sign board, a bridge guardrail, a road shoulder, and an inner part, entrance and exit of a tunnel.

A variable traffic safety sign is useful in informing road users of the possibility of a surface of a road or bridge section being wet or frozen without using an additional external power source by exactly expressing freezing and wet roadbed conditions of the road or bridge section using a thermochromic paint and a humidity indicator paint, and also allowing road drivers to exactly recognize the roadbed conditions of the road or bridge section by displaying the freezing and wet roadbed conditions of the road or bridge section conditions in response to changes in temperature and humidity, respectively. Also, the variable traffic safety sign is readily applicable to structures such as a bridge crash barrier, a traffic safety sign board, a bridge guardrail, a road shoulder, and an inner part, entrance and exit of a tunnel.

A method, comprising: providing a combination of a package and a label attached to the package, wherein the label comprises a fluorescent substance, illuminating the label with excitation light so as to cause the label to emit fluorescence light, capturing an image of the label by using an imaging unit, and detecting the position of the label by analyzing the captured image and/or detecting a degree of adhesion of the label by analyzing the captured image.

The present system provides a lightweight fire-resistant photoluminescent identifier system for firefighters, which is suitable for use on the firefighter's facemask, as well as other equipment. The system is lightweight and provides individual recognition of an individual firefighter. The identifier system lights up automatically in a low-light environment without batteries, yet prevents glare to the firefighter using the system. The components that comprise the system are fire-resistant to temperatures up to and exceeding 500 degrees Fahrenheit to facilitate personal recognition of the individual in dark and low-light areas.

The present system provides a lightweight fire-resistant photoluminescent identifier system for firefighters, which is suitable for use on the firefighter's facemask, as well as other equipment. The system is lightweight and provides individual recognition of an individual firefighter. The identifier system lights up automatically in a low-light environment without batteries, yet prevents glare to the firefighter using the system. The components that comprise the system are fire-resistant to temperatures up to and exceeding 500 degrees Fahrenheit to facilitate personal recognition of the individual in dark and low-light areas.

An optical device includes: a plurality of walls including at least a first wall and a second wall, wherein the plurality of walls are concentrically disposed around a first axis so as to be multi-stepped along the first axis, wherein each of the plurality of walls expands outward in a sector shape around the first axis at a predetermined central angle θ and includes an outer circumferential surface, a reflective curved surface at the outer circumferential surface, a first side end portion, and a second side end portion; a first reflective surface meeting the first side end portions of the walls; and a second reflective surface meeting the second side end portions of the walls. The first reflective surface and the second reflective surface meet each other on the first axis.

An optical device includes: a plurality of walls including at least a first wall and a second wall, wherein the plurality of walls are concentrically disposed around a first axis so as to be multi-stepped along the first axis, wherein each of the plurality of walls expands outward in a sector shape around the first axis at a predetermined central angle θ and includes an outer circumferential surface, a reflective curved surface at the outer circumferential surface, a first side end portion, and a second side end portion; a first reflective surface meeting the first side end portions of the walls; and a second reflective surface meeting the second side end portions of the walls. The first reflective surface and the second reflective surface meet each other on the first axis.

A badge is provided herein. The badge includes a housing having a front viewable portion. A first light source is disposed rearwardly of the viewable portion. A second light source is disposed adjacently to the first light source. A third light source disposed adjacently to the second light source. The first, the second, and the third light sources are configured to sequentially illuminate at offset intervals.