Machine Vision Lighting for Medical & Pharmaceutical Applications

The Physical Problem

Two very different optical failures show up constantly in pharmaceutical inspection. Tablets and capsules are often translucent or share a near-identical color with the tray or belt beneath them, so under front lighting their outline blends into the background and a vision system struggles to count or measure them reliably. Blister pack foil, meanwhile, is a crinkled, highly reflective surface: under direct lighting it throws back sharp, position-dependent hot spots that saturate the image and hide the very cavity or seal defect the inspection is meant to catch. Both problems occur on lines running at very high speed, where patient safety and regulatory compliance leave essentially no tolerance for a missed or double-counted unit.

The Optical Solution

Each failure has a distinct, well-established fix. For counting and shape verification, backlighting the tablet from behind turns it into a sharp, high-contrast silhouette regardless of its own surface color or any printed marking — the same contour-extraction principle used for any dimensional measurement, just applied to a pill on a tray. For blister foil, diffuse dome lighting illuminates the crinkled surface from every angle simultaneously, removing the single hard reflection a direct light would create and replacing it with a uniform, glare-free field where an actual seal or cavity defect stands out on its own.

Integration Tools

• Strobe & Overdrive Lighting
• M12 5-Pin Wiring Diagram