| 摘要 |
The disclosure describes new and improved reflex reflecting systems of the type comprising a spherical transparent lens having reflex reflective means arranged about it and secured relative thereto and optically associated therewith by means of a transparent binder material, the system being designed to be embedded in part in the surface layer of a traffic regulating sign formed on a traffic carrying surface of a road with the protecting portion of the lens being uncovered and exposed to impinging light, the said lens and the said binder being made of a transparent material the index of refraction of which is from 1.3 to 1.7, preferably about 1.5, and the total transparency parameter of the system, for light impinging under an incidence angle of 80 DEG , being greater than 0.2. |
