Capsule contamination in clear blister packs: reducing curved-surface glare
Clear blister domes act like a row of curved mirrors. An arch-shaped shadowless light lights them from every side at once, so the domes stop glaring and a tiny black speck on a capsule stands out.
Reduce glare before searching for a dark speck.
- LuzArch shadowless, 125 × 70 mm emitting
- Distancia de trabajo5–50 mm (light spec)
- Viewport45 mm camera hole
- ResultDirt clear, even background
Drag to rotate · scroll to zoomCamera and CAD lens geometry are published models where available. Light housings use printed dimensions; fixtures, parts, beam shapes and spacing illustrate the inspection principle. This is not an optical simulation or a dimensioned installation drawing.
Evidence you can inspect
The supplied camera image shows a dark mark on a capsule under diffuse arch illumination.
The source identifies the white arch light and describes visibility of the dirty region; no defect size is stated.
An optical contrast trial. It does not establish pharmaceutical process validation or a contamination detection limit.
What the camera saw
Cropped from the source test sheet; original test annotations are retained. Captures are not generated or enhanced. Drag the comparison slider or use the image buttons.
The challenge
Each blister dome reflects a bright highlight from any small light. Highlights hide what is under them and can be mistaken for defects.
The defect is small and dark on a two-tone capsule, so the light must be even over the whole pack.
How it was solved
The LS-DL12570 arch light curves over the pack along the conveyor and sends light down from every angle across the web. The domes reflect the evenly lit arch instead of a hot spot.
The supplied capture shows the capsules against a dark background, with a dark mark visible on a light capsule surface. It demonstrates useful contrast, without establishing contamination size or a production acceptance threshold.
Why it works
- 1
Diffuse light from a wide arc removes glare from curved, glossy packaging.
- 2
The open ends of the arch let the web pass through, so it fits inline on a blister machine.
- 3
The 45 mm viewport keeps the camera on axis without a beam splitter.
What to validate on your part
A useful sample image is the starting point. These are the checks that turn the concept into a defensible inspection.
- 01
Cover packaging variation
Test dome shape, foil finish, wrinkles and position variation.
- 02
Use known defects
Include the smallest required speck and contaminants on both capsule colours.
- 03
Measure false calls
Run acceptable packs at the intended speed and check reflections against the rejection rule.
The set-up and the parts
| Luz | Arch shadowless light (LS-DL12570), white 6600 K |
|---|---|
| Distancia de trabajo | 5–50 mm (light spec) |
| Cámara | Area scan through the 45 mm viewport |
Arch shadowless light, 125 × 70 mm emitting, 139 × 112 × 62 mm, 45 mm camera viewport.
$279.00In proposed setup
5 MP 2/3" colour, so capsule colour can be checked in the same image.
$679.00In proposed setup
16 mm macro lens; a 100 mm pack on a 2/3" sensor needs about 0.085x.
$319.00In proposed setup"Tested" identifies the part named in the source. "Our pick" is a proposed alternative or supporting part. The quote includes only cards marked "In proposed setup", with the quantities shown; other test arrangements are separate. Confirm colour, optics, controllers, power supplies, cables and mounting before ordering.
About this case study: the photos and camera images come from the application laboratory of the maker of the lighting and optics we sell, imaged on the parts shown; your results depend on your part, camera and set-up. This is an application-lab study, not a LumaSpec customer deployment. Source figures are reported results; proposed components require a fresh trial. The 3D scene illustrates the arrangement and does not simulate imaging performance.
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Make the next trial specific.
Tell us the part size, smallest defect or tolerance, available working distance, material and line speed. Include what a good part and a reject look like.
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