Backlights & LED Backlighting for Industrial Machine Vision
Flat, uniform LED panels placed behind or beneath the target to create a high-contrast silhouette — the reference lighting format for dimensional measurement and contour extraction.
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Industrial Machine Vision Backlighting: Principles and Advantages
What Is a Backlight Used For in Machine Vision?
A backlight is a diffuse LED panel placed behind or underneath the object, turning it into a dark silhouette against a bright, uniform background. That contrast is exactly what dimensional measurement, edge/contour detection and hole or feature counting need — where a bar light illuminates the front surface directly and a dome light handles reflective or curved parts, a backlight instead removes surface detail entirely in favor of a clean outline.
The object blocks the central rays, producing a sharp silhouette against the glowing panel.
Technical Highlights: Uniformity and Exposure Time
- Industrial design: aluminum frame for heat dissipation, integrated M12 connector for a standardized wiring harness.
- Hardened 24VDC electronics built for continuous production-line duty.
- Uniform diffuse output across the full panel via an opal diffuser, minimizing hot spots at the silhouette's edge.
- White LED is the most common choice for maximum contrast; Red or Infrared available for specific material or contrast requirements.
- Compatible with continuous and strobe/overdrive operation for high-speed lines.
Range Specifications and Formats
Every backlight in the range is configured from the parameters below to match your application and camera.
| Characteristic | Available Variants |
|---|---|
| Uniformity | > 90% across the full active surface (distortion-free contour measurement) |
| Standard Formats | 50×50 mm · 100×100 mm · 200×200 mm · 300×300 mm · Custom formats |
| Thickness | Ultra-thin: 12 mm to 25 mm depending on series, for tight-space integration |
| Wavelengths | Red (630 nm) · Infrared (850 nm — plastic penetration) · White · Blue |
| Operating Modes | Continuous 24V DC · Strobe Overdrive (exposure time < 100 µs) |
Why Is > 90% Homogeneity Critical for Your Measurements?
Switch between the two positions to compare the impact on the sharpness of your dimensional measurements.
Central hotspot + blurred edges → inaccurate measurements.
Light Intensity Profile (horizontal cross-section)
Intensity drops at the edges — bell-curve effect.
Optical Contrast Simulator: Pick the Right Wavelength
Select a light color and a sample to see how wavelength choice reveals — or hides — a feature for the camera.
The 3 LED Backlight Series
Pick the series matched to your line speed and environment, then request the datasheet or the 3D model.
BKL-STD Series: Standard 24V Diffuse Backlight
Silhouette control and dimensional measurement at standard line speed.
BKL-PWR Series: High-Intensity Overdrive Backlight
Built for high-speed lines and strobe operation.
BKL-SLIM / INOX Series: Ultra-Thin Backlight & IP69K Food-Grade Version
Tight-space integration, or washdown food-processing environments.
Industrial Applications and Use Cases
- Dimensional measurement of machined parts and thread pitch
- Fill-level control (bottles, vials)
- Opacity, bubble and inclusion inspection in glass or plastic
| Light Field / Beam Type | Wavelength Options | Typical Optical Window | Operating Mode |
|---|---|---|---|
| Standard Rectangular Panel | White, Red, Infrared | From 50×50mm to 300×300mm active area (configuration dependent) | Continuous or Strobe/Overdrive |
| Custom Cut-Out Panel | White, Red, Infrared | Dimensions on request, dependent on application | Continuous or Strobe/Overdrive |
Dimensions and optical windows shown are generic and given as typical ranges. Exact figures depend on the configuration selected — available on request from our engineering team.
Optical Beam Pattern Visualization and Formats
Select a beam type to see how the light behaves in cross-section at working distance.
See our overdrive calculation guide to optimize this product's intensity, and our standard M12 pinout for its electrical integration. Replacing a reference from another brand? See our brand equivalence and dual sourcing table to find the compatible alternative.
Datasheets and 3D CAD Files (STEP)
Request a Datasheet or a Quote
Tell us your application and one of our engineers will recommend the right configuration within 24 business hours.
Integration Guides and Camera Compatibility (Cognex, Keyence...)
Validate Your Application: Free Sample Testing
Borrow a demo kit to test on your own bench, or send us a sample of your part for a free contrast analysis in our lab.
Test on Sample or Borrow Equipment