In the field of laser marking, engraving, and cutting, galvanometer scanners (or galvo scanners) are vital components that determine beam movement, marking accuracy, and overall system performance. Among the different types available, digital and analog galvo scanners are the two most widely used. Each has unique strengths that suit different industrial needs, and understanding their differences can help you make a more informed decision.
This article explores both technologies objectively, comparing their features and highlighting where each one excels.
What Is a Galvo Scanner?
A galvo scanner is a device that uses mirrors driven by motors to control the direction of a laser beam. It determines where the laser will strike a material, allowing for precise marking or cutting patterns. These scanners are commonly found in fiber laser systems, CO₂ lasers, and UV lasers across industries such as electronics, automotive, packaging, and medical devices.
The main difference lies in how they receive and process control signals — either analog or digital.
Analog Galvo Scanners: Reliable and Proven
Analog galvo scanners have been used in laser systems for decades. They operate using analog voltage signals (e.g., ±5V or ±10V) to control the deflection of mirrors.
✅ Key Advantages:
- Mature Technology: Analog scanners are well-established and thoroughly tested in the industry.
- Cost-Effective: They are generally more affordable, making them suitable for smaller businesses or entry-level applications.
- Smooth Motion Control: The analog signal provides continuous motion, often preferred for specific applications like vector engraving.
🔧 Ideal For:
- Basic marking or engraving applications
- Budget-sensitive projects
- Integration with older control systems
- Smooth, flowing graphics or text
Digital Galvo Scanners: Precision and Flexibility
Digital galvo scanners utilize digital communication protocols (such as XY2-100 or SL2-100) to control mirror position. These systems convert digital signals into motion commands within the scanner itself, allowing for high-speed and high-resolution performance.
✅ Key Advantages:
- High Accuracy: Digital control enables more precise positioning and better repeatability.
- Noise Immunity: Digital signals are more resistant to electromagnetic interference, resulting in more stable operation.
- Advanced Features: Many digital scanners support built-in calibration, error correction, and custom tuning.
- Future-Ready: Compatible with modern industrial control systems and automation setups.
🔧 Ideal For:
- High-speed marking in production lines
- Complex barcode, QR code, or micro-text applications
- Environments with electrical noise
- Integration with Industry 4.0 platforms
Comparison Overview
| Feature | Analog Galvo Scanner | Digital Galvo Scanner |
| Signal Type | Analog Voltage (±5V) | Digital Protocol (XY2-100) |
| Precision | Medium to High | High to Very High |
| Cost | Lower | Higher |
| Integration | Legacy Systems Friendly | Modern Systems Optimized |
| Noise Resistance | Moderate | Excellent |
| Calibration Options | Limited Manual | Advanced Built-in Features |
Choosing the Right Galvo for Your Application
There is no “better” or “worse” between analog and digital — it all comes down to your specific application needs.
- Choose Analog if you’re working with well-tested equipment, have a limited budget, or your marking tasks don’t require ultra-high resolution or speed.
- Choose Digital if your application demands precision, reliability, scalability, or integration into smart manufacturing environments.
Both technologies are powerful in their own right — the key is matching the right tool to the right task.
Final Thoughts
Understanding the differences between analog and digital galvo scanners empowers manufacturers and engineers to make the best choice for their laser system investments. Whether you need cost-effective performance or cutting-edge control, both technologies provide valuable solutions in today’s laser marking landscape.
Need help choosing the right galvo scanner for your application? Contact our team for expert advice and customized solutions.