Lenticular signal lens having a smooth outer surface

Claim 1

A RIGID LENS COMPRISING A FIRST TRANSPARENT BODY OF A FIRST PLASTIC AND HAVING A REAR SURFACE THEREON, SAID REAR SURFACE ON SAID FIRST BODY HAVING COLLIMATING OPTICAL ELEMENTS THEREON, SAID FRONT SURFACE ON SAID FIRST BODY HAVING FIRST CONTROLLED SPREADING OPTICAL ELEMENTS THEREON FOR DIRECTING LIGHT PASSING THERETHROUGH INTO A PREDETERMINED PATTERN, AND A SECOND TRANSPARENT BODY OF A SECOND PLASTIC AND HAVING A REAR SURFACE AND A FRONT SURFACE THEREON, SAID REAR SURFACE ON SAID SECOND BODY HAVING SECOND CONTROLLED SPREADING OPTICAL ELEMENTS THEREON SHAPED COMPLEMENTARY TO SAID FIRST CONTROLLED SPREADING OPTICAL ELEMENTS FOR DIRECTING LIGHT PASSING THERETHROUGH INTO SAID PREDETERMINED PATTERN, SAID FRONT SURFACE ON SAID FIRST BODY AND SAID REAR SURFACE ON SAID SECOND BODY BEING IN BOTH PHYSICAL CONTACT AND OPTICAL CONTACT THROUGHOUT THE ADJACENT AREAS THEREOF TO PROVIDE A SINGLE INTERFACE THEREBETWEEN, SAID FRONT SURFACE ON SAID SECOND BODY BEING SMOOTH AND REGULAR AND FREE OF PITS AND CREVICES AND THE LIKE THEREBY READILY TO SHED THEREFROM WATER AND DIRT AND OTHER DEBRIS FALLING THEREON, SAID FIRST PLASTIC HAVING AN INDEX OF REFRACTION SUBSTANTIALLY DIFFERENT FROM THAT OF SAID SECOND PLASTIC THEREBY TO OBTAIN A SUBSTANTIAL REFRACTION OF THE LIGHT PASSING THEREBETWEEN AND THROUGH SAID FIRST AND SECOND OPITCAL ELEMENTS AND SAID SINGLE INTERFACE.