Phased lenticular sheets for optical effects

Claim 1

SYNTHETIC PLASTIC MATERIAL FOR PRODUCING OPTICAL EFFECTS HAVING A BODY PORTION OF SUBSTANTIAL LENGTH AND WIDTH DIMENSIONS PROVIDING FRONT AND REAR SURFACES, SAID MATERIAL BEING OF SUBSTANTIALLY UNIFROM THICKNESS AND HAVING A MULTIPLICITY OF CLOSELY SPACED CURVILINEAR LENSLIKE EMBOSSMENTS ON THE FRONT SURFACE THEREOF, EACH LENSLIKE EMBOSSMENT PROJECTING ON AN AXIS PERPENDICULAR TO SAID FRONT AND REAR SURFACES, SAID MATERIAL ALSO HAVING A MULTIPLICITY OF CLOSELY SPACED REFLECTIVE EMBOSSMENTS ON SAID REAR SURFACE, EACH REFLECTIVE EMBOSSMENT PROJECTING ON AN AXIS PERPENDICULAR TO SAID FRONT AND REAR SURFACES, EACH OF SAID LENS-LIKE AND REFLECTIVE EMBOSSMENTS DIMINISHING IN CROSS-SECTION OUTWARDLY FROM SAID BODY PORTION IN ALL PLANES WHICH INCLUDE ITS PERPENDICULAR AXES TO PROVIDE SIDE WALLS TAPERING INWARDLY FROM SAID BODY PORTION TOWARDS EACH PERPENDICULAR AXIS, EACH OF SAID LENS-LIKE EMBOSSMENTS BEING CURVILINEAR IN CROSS SECTION IN ALL PLANES WHICH INCLUDE ITS PERPENDICULAR AXIS AND IN ALL PLANES WHICH EXTEND NORMALLY THROUGH ITS PERPENDICULAR AXIS, SAID REFLECTIVE EMBOSSMENTS PHASING IN AND OUT OF AXIAL REGISTRY WITH SAID LENS-LIKE EMBOSSMENTS IN AT LEAST ONE DIRECTION OF SAID SURFACES TO PROVIDE VARYING OPTICAL EFFECTS DUE TO VARIATION IN THE ANGLE OF INCIDENCE OF LIGHT RAYS FOCUSED BY SAID LENS-LIKE EMBOSSMENTS OF SAID FRONT SURFACE ONTO THE TAPERING SIDE WALLS OF THE REFLECTIVE EMBOSSMENTS OF SAID REAR SURFACE, THE CENTER-TO-CENTER CLOSE SPACING OF SAID LENS-LIKE EMBOSSMENTS DEVIATING NOT MORE THAN 10 PERCENT FROM THE CENTER-TO-CENTER CLOSE SPACING OF SAID REFLECTIVE EMBOSSMENTS, SAID CLOSING SPACING OF SAID LENS-LIKE AND REFLECTIVE EMBOSSMENTS PRECLUDING ANY BANDS OF FLAT SURFACE THEREBETWEEN IN ANY DIRECTION OF SAID SURFACES, SAID TAPERING SIDE WALLS OF SAID REFLECTIVE EMBOSSMENTS REFLECTING THE PREDOMINANT PORTION OF LIGHT RAYS IMPINGING THEREON, SAID MATERIAL BEING OF A THICKNESS TO EFFECT SUBSTANTIAL FOCUSING OF LIGHT RAYS PASSING THROUGH SAID LENS-LIKE EMBOSSMENTS AND IMPINGING UPON SAID REFLECTIVE EMBOSSMENTS FOR SUBSTANTIAL REFLECTION THEREOF.