食品・飲料・医薬品の包装検査用マシンビジョンレンズ：選定ガイド

コンベアベルトの欠陥検出

Low distortion matters on belt inspection because distorted frames make consistent bounding-box or contour detection harder across the field. The Commonlands CIL512 (12mm C-mount, approximately −1.8% TV distortion) suits wide-belt coverage on a 1.1″ sensor. The CIL533 (16mm, −0.1% optical/rectilinear distortion, a different metric, not directly comparable to CIL512's TV figure) is the lower-distortion choice for narrower fields at longer working distances.

ラベルおよびバーコードの検証

Working distances for label stations typically fall between 150–400mm, where M12 lenses with good off-axis correction are competitive. The Commonlands CIL052 (5.2mm M12, −0.1% distortion) holds consistent resolution across a 1/1.8″ sensor for full-label capture at short working distances. The CIL042 (4.2mm M12, −0.7% distortion) covers a wider field for larger labels, though the higher distortion limits OCR edge-accuracy near the corners.

液面レベルおよびキャップの検査

Multi-camera setups are common here, one camera per lane or per product variant, so cost matters. The Commonlands CIL083 (8mm M12, $19) is the cost-effective choice: at F/2.8 its aperture works with standard line illumination for reasonable exposures, with sensor response and exposure time setting the actual margin, and −0.5% TV distortion is adequate for threshold pass/fail.

For measurement-grade systems where image height maps to a physical volume, the CIL553 (16mm C-mount, −0.09% distortion, 25MP) gives better geometric accuracy and supports higher-resolution sensors for finer increments.

異物および汚染物質の検出

Foreign object detection sometimes pairs machine vision with NIR illumination, because some contaminants that blend into white light differ in reflectance across 700nm to 1100nm. Whether it works is case-specific: the contaminant, its thickness, the product matrix, and the illumination geometry all matter. Silicon NIR often finds insects and dark plant material; clear glass, bone, and metal in bulk product commonly need hyperspectral, SWIR, or X-ray instead.

A standard lens with an IR-cut filter strongly attenuates that range, so it is unsuitable for NIR work regardless of sensor sensitivity.

For NIR food inspection, specify a lens variant without the IR-cut filter. Commonlands offers CIL083-F2.8-M12ANIR for compact M12 installations and CIL512-F2.8-CMANIR for C-mount setups. Both transmit beyond 700nm for use with NIR illumination sources. See the NIR imaging guide for sensor and illumination pairing.

For visible-light contamination such as surface marks, color patches, or label anomalies, standard lens variants work fine. What matters most is contrast performance at the spatial frequencies of the smallest contaminant you need to flag.

選別と等級分け

Items need to stay fully in frame as they pass, which means a wide-angle lens or a camera set farther back. The Commonlands CIL042 (4.2mm, F/1.9) gives the widest field here and collects more light geometrically than F/2.8 alternatives, so it suits fast lanes where motion blur is the main concern. The CIL083 (8mm, F/2.8) works better for texture grading over a smaller inspection area.

食品・医薬品製造におけるM12とCマウントの比較

M12 and C-mount are different optical systems, not variations of the same design. M12 lenses use a rigid body: focus is set by threading the barrel, and there is no internal mechanism for aberration rebalancing at different focus positions.

Commonlands C-mount lenses use cam-driven focus; the focus mechanism and its near-limit behavior are product-specific, so check the product page. The C-mount standard itself dictates no focus mechanism; other C-mount lenses use unit or front-cell focus, or ship fixed-focus. See the full mount comparison guide for the mechanical details.

M12 lenses are smaller, lighter, and cheaper, typically $19–79 in the Commonlands food and packaging range. Across arrays of 10–20 cameras on wide conveyors that adds up, and M12 integrates cleanly into compact embedded smart cameras.

For IP69K washdown protection on the lens itself, the CIL190 (19mm M12, F/1.6, IP69K) covers narrow fields at longer standoff. A wide belt needs a much shorter focal length, so size the field first, then check the IP69K CIL337 (3.6mm), CIL384 (3.34mm), and CIL355 (5.5mm) against it. C-mount installations in direct washdown zones rely on an external sealed housing, since the iris mechanism is not rated for high-pressure water.

食品・医薬品製造における環境への配慮

洗浄耐性（IP67 対 IP69K）

IP67 covers dust ingress plus immersion to 1 meter for 30 minutes, the IEC 60529 IPX7 test. IP6K9K (industry shorthand IP69K) comes from ISO 20653, a separate road-vehicle standard, and covers a defined high-pressure, high-temperature jet spray, not the same test as IEC 60529. These are different requirements: an IP67 rating makes no claim against an 80°C pressure-washer stream, so do not assume it survives one.

Either rating applies to the tested lens variant in its mounted configuration, under that standard's water and dust exposures only. It does not cover detergents, steam, repeated sanitation cycles, or the rest of the camera. Check it against the plant's protocol. Not every station needs IP69K. Many pharmaceutical labeling and carton cells run in dry, climate-controlled rooms where a standard sealed lens is enough.

For lenses without an IP rating, a sealed housing with an AR-coated optical window is the standard approach, which keeps transmission losses low. The IP rating guide covers what each rating actually tests and its limits.

温度サイクル試験

Lenses moving between cold storage (0–5°C) and warm production areas (20–30°C) can fog optical elements or shift focus as mechanical tolerances tighten. Optical polymers have higher, less predictable thermal expansion than glass, so element materials and how the design is athermalized both affect focus stability. Check the datasheet operating-temperature range. See ruggedized machine vision lenses for the Commonlands products built for thermal cycling.