Characteristics of Ring Lights, Bar Lights, and Surface Lights
Ring lights, bar lights, and surface lights are commonly used lighting sources in machine vision inspection. Each type has unique characteristics and serves different inspection purposes. Let's explore these lighting sources and their key features.
1. Ring Light
A ring light is an array of high-density LEDs arranged in an optimized structure. It offers stable performance, high brightness, and easy installation. The light can be directed at different angles and with various color combinations to illuminate the object without casting shadows, highlighting imaging features. It can also be used with a diffuser to achieve more uniform and soft lighting.
- Detection Range: Ring lights are commonly used for inspecting ICs and other semiconductor products' surface characters, inspecting PCB circuit boards and components, and general appearance inspections.
2. Bar Light
Bar lights are especially suitable for imaging large-sized features. The length can be customized, and the color of the light can be selected based on specific needs. Multiple bar lights can be combined, and the illumination angle can be adjusted according to the inspection requirements.
- Detection Range: Bar lights are ideal for detecting packaging damage, inspecting LCD characters, locating markings, inspecting liquid crystal components, metal surface inspection, and checking the flatness of connector pins.
3. Surface Light
Surface lights are a type of planar light source where LEDs are evenly distributed across the base, forming a uniform light after diffuse reflection. This type of light is typically used for contour and outline detection.
- Detection Range: Surface lights are suitable for outline and contour measurement, machining dimension measurement, glass bottle damage detection, foreign object detection, scratch and stain detection on transparent objects, internal foreign object detection, and general damage detection.
Conclusion:
Each type of light source has its unique strengths and is suitable for different inspection tasks. Ring lights are versatile and can be used for a wide range of inspections, bar lights are ideal for large-scale inspections, and surface lights are excellent for uniform illumination and contour measurements. When choosing a light source, consider the specific requirements of your machine vision inspection task, including the size, material, and desired detection range.