| 摘要 |
<p>1501910 Retro-reflectors L EIGENMANN 19 May 1975 [20 May 1974] 21108/75 Heading G2J A retro-reflecting system for use in road marking comprises a sphere 10, reflecting means (e.g. reflectively coated smaller spheres 16) and a binder medium 18 which has a different R.I. from that of the sphere 10 except in a transition zone Zt wherein the R.I. varies progressively to match the sphere and the binder medium progressively, in order to avoid reflection losses. The sphere 10 may be made of a transparent polymer (e.g. a methacrylate) and the binder medium 18 may be made of a different polymer (e.g. isocyanate) which is capable of progressively decreasing diffusion into the material of the sphere in the presence of a solvent. Three specific examples are given.</p> |
