Patent ID: 9239412
Filing Date: 2016-01-19
CPC Classification: G02B

Claim Text:
1. A retroreflective member comprising a single reflective layer and transparent microscopic beads, wherein the retroreflective member returns at least part of visible light incident at an incident angle in the direction of the incident angle at a phase difference corresponding to a visible light wavelength thereby intensifying a light component having the visible light wavelength by interference by generating a coherent light from the incident light having the phase difference and the incident light of non-phase difference, and wherein the wavelength of the intensified light component of the visible light wavelength depends on the incident angle, wherein the single reflective layer comprises a metal compound provided just below the transparent microscopic beads that has a higher refractive index than the transparent microscopic beads; wherein the metal compound is a material selected from the group consisting of zinc sulfide, titanium dioxide, indium oxide, zirconium dioxide, magnesium oxide, calcium fluoride, magnesium fluoride, sodium fluoride, and silicon dioxide; wherein the single reflective layer has an optical layer thickness within the range of 0 to 600 nm; wherein the ratio of the optical layer thickness T wherein a thickness of a transmitting part of the incident light in the optical layer has gradations within the range of 100 to 600 nm.