Choosing the right field lens for your laser marking machine is crucial for achieving optimal results. The lens determines the focal length and directly impacts the size and precision of the marking. Here’s what you need to consider when selecting a lens.
Common Lens Sizes: Laser marking machines commonly use lenses with the following field sizes: 50x50mm, 110x110mm, 160x160mm, 220x220mm, 300x300mm, and 500x500mm.
Factors to Consider:
- Size of the Marked Object:
- The size of the object you intend to mark is a primary consideration. Larger objects require lenses with larger field sizes.
- Size of the Marking Range:
- The marking range or area you need to cover will influence your lens choice. A larger marking range requires a lens with a longer focal length.
- Precision of Processing:
- The precision required for your markings and the overall compatibility with your equipment are essential factors. Higher precision demands a lens that can maintain a small, focused spot size.
Key Points:
- Object Size and Marking Range:
- When marking larger objects or needing a larger marking area, a larger lens is necessary. However, merely increasing the marking range can introduce several challenges.
- At larger scanning areas, the laser spot diameter increases, focus becomes less sharp, spot size enlarges, and laser power and density decrease rapidly. The extended working distance can also result in significant laser energy loss, affecting precision machining.
- Equipment Configuration:
- The configuration of your laser marking machine is vital. For instance, if you have a 20W fiber laser marking machine, it is generally recommended not to use a lens exceeding 300x300mm.
- Larger lenses can lead to higher laser consumption, degraded beam quality, and reduced marking effects.
Recommendations:
- Small Area Field Lens:
- Opt for a smaller field lens when it meets your marking requirements. This ensures better laser power and precision.
- Upgrading for Larger Areas:
- If a larger marking area is necessary, consider upgrading your machine’s overall configuration. This may include increasing the laser power, enhancing the scanning galvanometer, and other components to maintain quality and precision.
Conclusion: Selecting the right laser marking field lens involves balancing the size of the marked object, the marking range, and the precision required. Ensure your equipment configuration supports the lens choice to achieve the best results. By considering these factors and recommendations, you can optimize your laser marking processes for efficiency and quality.
