Briefly describe the commonly used strip light sources, surface light sources, ring light sources

      In the machine vision industry, the types of LED light sources include strip light sources, four-sided adjustable light sources, ring light sources, ring shadowless light sources, dome light sources, surface light sources, parallel surface light sources, coaxial light sources, coaxial parallel light sources, and parallel shadowless light sources. Shadow light source, point light source, line light source , etc. Its applications include:

1. Strip light source

The LED lamp beads are arranged in a rectangle, and the strip light is mostly angled from the side.

Application scenarios

Barcode recognition, positioning mark recognition

LCD component testing

Scratch detection on large area object surface

Component edge detection

2. Surface light source

LED lamp beads are arranged in an area array and are mainly used for coaxial backlighting. Surface light sources are mostly used for coaxial backlighting.

Application scenarios

Generally used for backlight detection

Profile measurement

Workpiece size inspection

Film and mobile phone screen stain detection

Detection of surface scratches, internal foreign matter, damage, etc. on transparent objects

3. Ring light source

The LED lamp beads are arranged in a ring shape and have a certain angle with the optical axis. The ring light is irradiated at multiple angles.

Application scenarios

PCB substrate inspection

PCB assembly inspection

Product packaging appearance and label inspection

Microscope lighting, general appearance inspection

Crack and crack detection (low angle light)

Scratch detection on objects with smooth surfaces (low angle light)

4. Coaxial light source

A surface light source is made by passing through a spectroscope. The spectroscope is a semi-transparent and half-mirror. The reflected light is on the same axis as the camera, eliminating ghost images and overcoming the interference caused by surface reflection. Coaxial light is mostly reflected on coaxial non-concentric lenses. direct light

Application scenarios

Scratch detection on highly reflective surfaces such as metal glass bottles

On-wafer laser marking inspection

Engraving characters on bearings and beverage cans

5. Dome light source

Lamp beads are generally installed at the bottom of the dome and illuminate the target indirectly through the diffuse reflection plate of the dome. The dome light mostly uses coaxial indirect light.

Application scenarios

Spherical diffuse reflection luminescence, shadowless light source

Detection of uneven and reflective surfaces

Surface detection of reflective objects such as metal and glass surfaces

Coding detection on the bottom of cans

Food and drug appearance inspection