The Evolution, Working Principle and Future Trends of Vision-Guided Flying Laser Marking
1. From Traditional Laser Marking to Intelligent Marking
Traditional laser marking typically uses a fixture to hold a workpiece in a defined position.
Once the workpiece has been positioned, the laser marking system uses a Galvanometer scanner to mark text, numbers, logos, graphics, QR codes, DataMatrix codes, serial numbers, and other identification information.
This approach remains effective for applications with stable product dimensions, consistent positioning, and relatively simple production requirements.
However, modern manufacturing is becoming more automated and flexible, exposing several limitations of conventional fixture-based marking.
1.1. Dependence on Fixtures
Traditional laser marking often requires dedicated fixtures to accurately position products.
When product dimensions, shapes, or marking locations change, the fixture may need to be adjusted or replaced.
For small-batch and multi-product manufacturing, fixture design, production, adjustment, and maintenance can increase both cost and changeover time.
1.2. Product Position Variations
Manual loading inevitably introduces variations in product position and orientation.
If the actual position of a workpiece differs from the programmed position, the marking may also shift.
This can affect both the appearance and consistency of the final product.
1.3. Production Efficiency
Conventional static laser marking normally requires the product to stop before marking.
On high-speed production lines, repeatedly stopping products for positioning and marking can reduce the overall production rate.
1.4. Limited Production Flexibility
When multiple product models are manufactured on the same line, traditional systems may require fixture replacement, program adjustment, and mechanical repositioning.
This makes conventional marking less flexible for mixed-model and small-batch production.
2. The Origin of Flying Laser Marking
As automated production lines and high-speed conveyors became increasingly common, manufacturers needed laser marking systems that could be integrated directly into continuously moving production lines.
This led to the development of Flying Laser Marking.
Unlike static laser marking, flying laser marking allows products to remain in motion while the laser performs the marking process.
The basic concept is simple:
Synchronize laser scanning with the movement of the product.
In static marking, the workpiece remains stationary relative to the laser system, so the laser can follow a predefined scanning path.
In flying marking, however, the workpiece is continuously moving. If the laser follows a static scanning path, the resulting text or graphics may be displaced, stretched, or distorted.
The marking system therefore needs to detect product movement and dynamically compensate for the displacement during the marking process.
3. How Does Flying Laser Marking Work?
A typical flying laser marking system includes:
* Laser source
* High-speed galvanometer scanner
* Encoder
* Product detection sensor
* Laser control card
* Marking control software
* Industrial computer
* Conveyor system
When a product enters the marking area, a sensor detects its arrival while the encoder continuously provides information about conveyor movement.
The control system calculates the required position compensation based on the product's movement and synchronizes the laser scanning path accordingly.
The process can be summarized as:
Product movement → Motion detection → Position calculation → Dynamic compensation → Laser marking
This enables products to be marked while moving continuously without requiring the production line to stop.
Flying laser marking is therefore particularly suitable for high-speed applications such as production dates, batch numbers, serial numbers, QR codes, DataMatrix codes, and other variable information.
4. The Development of Vision-Guided Laser Marking
Flying laser marking solves the problem of marking products while they are moving.
However, another challenge remains:
Where exactly should the laser mark if the product position or orientation changes?
This is where vision-guided laser marking becomes important.
Instead of relying entirely on a mechanical fixture, a vision-guided system uses an industrial camera to capture the actual position of the product.
Image-processing algorithms can identify product contours, edges, holes, reference points, or other recognizable features.
The system then compares the detected position with a predefined reference or template and calculates the required position and angle compensation.
The laser marking coordinates can then be automatically adjusted before marking.
This significantly improves the flexibility of the marking process and reduces the impact of product positioning variations.
5. The Core Logic: See, Recognize and Guide
The operating principle of a vision-guided laser marking system can be summarized in three steps:
See → Recognize → Guide
5.1. See — Image Acquisition
The industrial camera first captures an image of the product.
Depending on the product material, color, dimensions, and surface characteristics, different cameras, lenses, and lighting systems can be selected.
Proper illumination improves image contrast and makes product edges, contours, holes, and reference features easier to identify.
5.2. Recognize — Feature Recognition
Vision software analyzes the captured image.
Common image-processing methods include:
* Edge detection
* Contour detection
* Pattern matching
* Feature point recognition
* Circle and hole detection
* Barcode and QR code recognition
* OCR recognition
For more complex applications, AI-based vision algorithms can also be introduced to improve recognition capability and adaptability.
The system calculates the actual position and orientation of the product and identifies the required marking area.
5.3. Guide — Automatic Position Compensation
After the product position has been identified, the vision system sends the calculated information to the laser control system.
The marking software automatically adjusts the marking coordinates, rotation angle, and other relevant parameters according to the actual product position.
The complete process becomes:
Product position variation → Automatic recognition → Coordinate compensation → Accurate marking
This is one of the key differences between vision-guided laser marking and conventional fixture-based marking.
6. Combining Vision Guidance with Flying Laser Marking
As industrial automation continues to advance, vision guidance and flying laser marking are increasingly being integrated into a single system.
A typical vision-guided flying laser marking workflow can be described as:
Vision capture → Feature recognition → Position calculation → Encoder feedback → Motion compensation → Laser marking
For example, on a continuously running conveyor:
- The product enters the vision inspection area.
- The industrial camera captures the product image.
- The vision software identifies the relevant product features.
- The system calculates position and orientation deviations.
- The encoder provides real-time movement information.
- The controller calculates the required motion compensation.
- The laser marks the product while it is moving.
- The vision system can then verify the marking result.
This transforms the traditional:
Positioning → Marking
workflow into a more intelligent process:
Recognition → Positioning → Marking → Inspection → Traceability
7. Key Advantages of Vision-Guided Flying Laser Marking
7.1. Reduced Dependence on Precision Fixtures
Vision systems can detect the actual position of a product and compensate for positional deviations.
In suitable applications, this can reduce the need for highly precise dedicated fixtures.
Different products can be managed through different vision templates and marking programs, allowing faster product changeovers.
7.2. Higher Production Efficiency
Flying marking allows products to remain in continuous motion during the marking process.
By reducing stopping, positioning, and manual loading operations, the system can help improve overall production throughput.
7.3. Greater Production Flexibility
Vision positioning can accommodate a certain degree of product position and orientation variation.
Combined with multiple templates and marking programs, the system can support mixed-model production.
Product changeover can often be performed mainly through software rather than frequent fixture replacement.
7.4. Improved Marking Consistency
When product positioning varies, the vision system can calculate the actual position and automatically compensate for the deviation.
This helps reduce marking errors caused by manual loading and positioning variations.
7.5. Integrated Inspection and Traceability
Vision systems can be used not only for positioning but also for marking verification.
The system can read and verify:
* QR Codes
* DataMatrix Codes
* Barcodes
* Serial Numbers
* OCR Text
When integrated with MES, ERP, or other production management systems, marking data can be linked to production information, creating a foundation for product traceability.
8. Typical Applications
8.1. Food and Beverage
Food and beverage production lines often operate at high speeds.
Flying laser marking can be integrated directly into the conveyor line to mark production dates, batch numbers, QR codes, and other variable information.
8.2. Pharmaceutical and Packaging
Pharmaceutical manufacturing requires reliable identification and traceability.
Vision positioning can identify the actual package location, while the laser system provides stable and permanent marking.
8.3. Electronics and 3C Manufacturing
Electronic products often have small dimensions, multiple models, and high production speeds.
Vision-guided laser marking can identify PCB features, electronic components, housings, and other workpieces, automatically adjusting the marking position according to actual product alignment.
8.4. Automotive Components
Automotive components may require part numbers, production batches, QR codes, serial numbers, and other traceability information.
Vision positioning allows the system to accommodate different component positions and orientations, while laser marking provides durable identification.
8.5. New Energy
The rapid development of electric vehicles and battery manufacturing has increased the demand for reliable product identification and traceability.
Vision-guided laser marking can help accommodate different workpiece positions, dimensions, and orientations while maintaining consistent marking locations.
8.6. Industrial Components
Bearings, mechanical components, hardware, tools, and other industrial products can also benefit from vision-guided laser marking.
The technology is particularly useful for multi-product and small-batch production, where reducing fixture changes can significantly improve production flexibility.
9. Vision-Guided Laser Marking vs. Traditional Laser Marking
| Feature | Traditional Laser Marking | Vision-Guided Laser Marking |
| Positioning | Fixture-based | Camera-based |
| Fixture dependency | Relatively high | Reduced |
| Position compensation | Limited | Automatic |
| Product placement | Requires accurate positioning | More flexible |
| Product changeover | Fixture and program adjustment | Mainly software/template change |
| Mixed-model production | Limited | More suitable |
| Flying marking | Usually not available | Can be integrated |
| Vision inspection | Usually separate | Can be integrated |
| Traceability | Requires additional integration | Easier to integrate |
| Production flexibility | Moderate | High |
It is important to note that vision positioning does not necessarily mean that mechanical fixtures can be completely eliminated.
For applications requiring extremely high positioning repeatability, processing stability, or safety, mechanical positioning mechanisms can still play an important role.
The key advantage of vision technology is its ability to detect actual product positions and compensate for deviations, while also improving production flexibility.
10. From Laser Marking to Intelligent Manufacturing
In the past, the primary function of a laser marking machine was simply to mark text, numbers, graphics, and codes.
With the development of machine vision, motion control, industrial communication, and production management systems, modern laser marking systems are becoming capable of performing much more than marking.
The process is evolving toward:
Positioning + Marking + Inspection + Identification + Traceability
Laser marking equipment is therefore becoming an intelligent identification node within the production line.
By connecting laser marking systems with PLCs, robots, MES, ERP, and Industrial IoT platforms, manufacturers can further integrate production data collection, product identification, quality verification, and process traceability.
11. Future Trends in Vision-Guided Flying Laser Marking
11.1. Higher Speed and Higher Accuracy
Future high-speed production lines will demand higher performance from laser marking systems.
Vision acquisition speed, image-processing speed, communication speed, and laser scanning speed will continue to improve.
The challenge will be to achieve both high throughput and stable marking quality.
11.2. AI-Based Vision Recognition
Traditional machine vision mainly relies on template matching, edge detection, and predefined features.
With the development of AI vision, systems will become increasingly capable of handling complex product recognition, defect detection, and abnormality identification.
Future vision systems may not only answer:
“Where is the product?”
but also:
“What product is it? Is it the correct product? Is it acceptable?”
11.3. 3D Vision and Complex Surface Marking
Two-dimensional vision has limitations when dealing with curved, irregular, or height-variable surfaces.
3D vision, three-dimensional profile inspection, and multi-axis motion control will therefore become increasingly important.
By acquiring the surface geometry of a workpiece and combining it with laser focus and trajectory compensation, manufacturers can perform more complex marking on curved and irregular surfaces.
11.4. Fully Automated Production
Vision systems will become increasingly integrated with robots, conveyors, PLCs, and MES platforms.
A future automated production line may follow a workflow such as:
Robot Feeding → Vision Inspection → Vision Positioning → Flying Laser Marking → Code Verification → Data Upload
This will enable a higher level of production automation.
11.5. Digital Traceability
In the future, laser marking will not simply mean putting information onto the surface of a product.
It will increasingly serve as an entry point for establishing a digital identity for each product.
A unique QR code, DataMatrix code, or serial number can be linked to production batches, equipment, processing parameters, inspection results, and other manufacturing data.
This creates a more complete product lifecycle traceability system.
12. Conclusion
From conventional fixture-based laser marking to flying laser marking, and then to the integration of vision positioning and flying marking, laser identification technology is evolving from a standalone processing tool into an intelligent manufacturing solution.
Flying laser marking solves the challenge of marking products while they are continuously moving.
Vision-guided laser marking solves the challenge of accurately locating products when their position, orientation, or alignment varies.
The combination of these technologies enables:
Dynamic Recognition + Automatic Positioning + Real-Time Compensation + Online Laser Marking
In the future, with the further integration of AI vision, 3D vision, high-speed motion control, industrial communication, and MES systems, vision-guided flying laser marking will focus not only on **whether a product can be marked**, but also on:
Where to mark, what to mark, whether it was marked correctly, and how to trace the result.
For food and beverage, pharmaceutical, electronics, automotive, new energy, and industrial component manufacturing, the transition from conventional laser processing to intelligent positioning + laser marking + online inspection + digital traceability will become an important direction for flexible and intelligent manufacturing.