Processes for Minimizing Seams in Cylindrical Optical Tooling ("Seamless Mother"), especially those used in Prismatic Retroreflective Sheeting for Projection Screens
Publication Date: 2019-Jan-29
The IP.com Prior Art Database
The process for making optical tooling, which requires precise industrial alignment with low tolerances, may involve electroforming multiple replicas of a piece of the tooling and attaching these pieces together to create a larger piece. The attaching step may be done by laser welding on the front (optics side), on the back, or both. Other techniques may also be used to affix the pieces together, such as cement, vacuum, magnetic, and/or mechanical hold down techniques.