公开(公告)号：US11073641B2

公开(公告)日：2021-07-27

申请号：US16126778

申请日：2018-09-10

Applicant: ORAFOL AMERICAS INC.

Inventor： Steven Scott ,  Arthur J. Davis

IPC: G02B5/124 ,  B29D11/00

Abstract: A method for forming a retroreflective prism in a substrate includes inserting and retracting a single point diamond tool through a surface of the substrate while moving the single point diamond tool, the substrate, or both the single point diamond tool and the substrate in a direction of travel along at least one axis to generate a facet in the substrate having a facet face parallel to the direction of travel of at least one of the single diamond point tool or the substrate. The facet face has an angle defined by a chiseling edge of the single point diamond tool. The inserting and retracting is repeated at a plurality of locations on the substrate to form an array of retroreflective microstructures on the surface of the substrate. At least one of the array of retroreflective microstructures is a retroreflective prism having a polygonal projected aperture.

公开(公告)号：US20190079223A1

公开(公告)日：2019-03-14

申请号：US16126778

申请日：2018-09-10

Applicant: ORAFOL AMERICAS INC.

Inventor： Steven Scott ,  Arthur J. Davis

IPC: G02B5/124 ,  B29D11/00

Abstract: A method for forming a retroreflective prism in a substrate includes inserting and retracting a single point diamond tool through a surface of the substrate while moving the single point diamond tool, the substrate, or both the single point diamond tool and the substrate in a direction of travel along at least one axis to generate a facet in the substrate having a facet face parallel to the direction of travel of at least one of the single diamond point tool or the substrate. The facet face has an angle defined by a chiseling edge of the single point diamond tool. The inserting and retracting is repeated at a plurality of locations on the substrate to form an array of retroreflective microstructures on the surface of the substrate. At least one of the array of retroreflective microstructures is a retroreflective prism having a polygonal projected aperture.

公开(公告)号：US20230137758A1

公开(公告)日：2023-05-04

申请号：US17514934

申请日：2021-10-29

Applicant: ORAFOL AMERICAS INC.

Inventor： Arthur J. Davis

IPC: G02B5/124

Abstract: A retroreflector structure with a plurality of cornercube prisms in a sheet and a projected aperture of at least one of the cornercube prisms has a concave polygon shape with at least one interior angle greater than 180°.