Wielandts UPMT is a start-up company that has developed a unique patented technology called DPI® ( Dynamic Part Indexing ) that is a real breakthrough solution for the machining of lens arrays and monolithic multi-cavity molds by diamond machining. Using this technology, Wielandts UPMT manufactures lens array masters to customer specifications for diverse applications: MLA masters for automotive lighting, fully populated masters for optical structure replication processes, IR lens batch machining and optics at wafer level.

With DPI®, the outstanding form accuracy, surface finish and geometric freedom that is achievable by ultra-precision diamond turning on a single on-axis lens can be obtained on each lens of each array of a fully populated master.

This technology brings many advantages compared to classical freeform machining techniques like amongst others: lower surface form error, reduced machining times, increased geometrical freedom, true 100% fill factor (with extremely sharp edges between intersecting lenses), lower surface roughness, etc, which makes DPI® a unique solution for your next lens array application.

DPI® On-axis Diamond Turning

• Shapes: Aspheres, mild freeforms, each lens can have a different optical definition
• Feature sizes: > 10 µm
• Lens sag: > 10 µm, < 10 mm
• Form irregularity: 100 nm p-v
• Ra roughness: 2 nm
• Edge slopes: < 80°, limited by tool clearance
• 100% fill factor
• Position accuracy: Lens to lens: < 1 µm, MLA to MLA: 1 µm
• Diffractive structures: Yes (axis symmetric)
• Master size: Up to 8”
• Number of lenses: Up to tens of thousands
• Master material: NiP, brass, PMMA, CuBe, Al, ...