Design of Light Source and Optical System for Visual Labeling Machine: Principles, Applications, and Future Trends

1、 The core function and principle of the light source system

The light source system isVisual labeling machineThe design of the "eyes" directly affects the imaging quality and labeling accuracy. By precisely controlling the wavelength, incident angle, and brightness of the light, the target features can be effectively highlighted and background interference can be suppressed. Its working principle is based onOptical reflection characteristics：

• diffuse surfaceSuitable for circular light or dome light (such as paper boxes)

• Mirror reflective material(such as metal) requires coaxial light or polarized light

• Transparent object(such as glass bottles) require backlighting or dark field illumination

2、 Mainstream light source types and technical characteristics

3、 Four key elements of optical system design

1. Selection of lighting mode

• Mingchang LightingSuitable for ordinary surface feature detection (accuracy ± 0.1mm)

• dark-field illuminationDetect small scratches and bumps (sensitivity up to 1 μ m)

• Composite lightingMulti light source collaborative work to cope with complex scenes

2. Wavelength matching

3. Uniformity control

• Integral sphere uniform light technologyUniformity>95%

• Diffuser board designEliminate light spots and dark areas

• Intelligent dimming systemReal time feedback adjustment of LED brightness

4. Anti interference design

• polarizing filterSuppress metal reflection (extinction ratio 100:1)

• Strobe controlSynchronize with camera exposure to eliminate motion blur

• Environmental light shieldingNarrow band filter combination for shading hood

4、 Typical Industry Application Solutions

1. Food and beverage industry

• challengeWater mist, oil stains, curved bottle bodies

• plan：

  • Adopting waterproof IP67 ring light

  • Multi angle bar light combination eliminates shadows

  • 650nm wavelength red light penetrates the condensed water film

2. Electronic components

• demandSubmillimeter level labeling accuracy, anti PCB board reflection

• configuration：

  • Coaxial polarizing mirror (extinction ratio ≥ 200:1)

  • Detection of invisible markers using ultraviolet light (365nm)

3. Pharmaceutical packaging

• Special requirements: Aseptic environment, transparent blister positioning

• Technical Points：

  • Sealed dustproof light source module

  • Infrared backlight (940nm) penetrates the blister aluminum film

5、 Technological development trends

1. Intelligent adaptive light source

• AI dimming systemAutomatically adjust light intensity and angle through real-time image analysis

• Parameter memory functionStorage of 100 lighting solutions for products

2. Multispectral imaging technology

• Visible light near-infrared synergySynchronize detection of surface printing and internal structure

• Application of hyperspectral cameraIdentify material composition (such as distinguishing PET from PVC)

3. 3D structured light upgrade

• Laser line scanningAccuracy improved to ± 0.02mm

• Fiber optic guiding technologyRealize flexible arrangement of complex optical paths

4. Miniaturization and Integration

• COB packaging technologyReduce volume by 50% and increase heat dissipation efficiency by 30%

• Integrated light source camera systemReduce calibration time and improve system stability

5. Energy saving and environmental protection design

• LED luminous efficiency improvementPower consumption reduced by 40% (up to 200lm/W)

• Heat recovery systemUsing light source waste heat to assist equipment in maintaining temperature

6、 Selection and Maintenance Guide

1. Selection decision matrix

2. Maintenance points

• Daily checkClean the optical window and verify the uniformity of illumination

• Quarterly maintenanceReplace the aging LED module (if the light attenuation is greater than 20%, it needs to be replaced)

• Annual calibrationSpectral characteristic detection and angle calibration

VII. Conclusion

High quality light source design can increase the detection efficiency of visual labeling machines by more than 40% and reduce the defect rate to less than 0.1%. With the development of technologies such as intelligent dimming and multispectral fusion, the light source system is upgrading from an "auxiliary component" to an "intelligent perception core". It is recommended that companies choose customized optical solutions based on product characteristics and pay attention to cutting-edge technologies in 3D vision and AI adaptive lighting to maintain industry competitiveness.