| 摘要 |
A light-diffusing lens for use with optical arrangements such as traffic signals, where the light diffusion is to vary as a function of the viewing angle and be different in two orthogonal planes comprising the optical axis of the arrangement, in which a light source projects a beam of rays towards the lens and so that the lens shows one or several light-emitting zones within the entire viewing range, especially so that the light diffusion occurs within at least one predetermined maximum angle zone calculated from the optical axis. The optical arrangement comprises a lens surface which on one side is designed with one or several non-rotation symmetrical calotte-shaped cavities and/or projections which were there are several cavities and/or projections form elementary lenses every one of which provides one or several light-emitting zones and which are designed as complete or partial toroid-shaped or two-axis aspheric toroidal (atoric) calottes, especially so that the large axis (x-x) of the calotte lies orientated in vertex (5) of the said plane through the elementary lens and parallel to that plane where the light diffusion is lowest, and so that the small axis (y-y) of the calotte lies orientated in the opposite plane, where the light diffusion is highest. A lens of the said type is well suited for diffusing light substantially only within a half-plane of a quadrant of the optical arrangement's lens surface. |
