Select Your Galvo Scanner: Key Considerations for Success

Laser processing relies on mirror-mounted galvanometers or galvo scanners to steer laser beams precisely and quickly. Selecting the right galvanometer laser scanner depends on various factors, such as scan speed and accuracy, which significantly affect processing efficiency and quality. It is crucial for scanner specifications to align with application needs to enhance speed and minimize errors in complex laser operations. This article explores galvo scanners, their technologies, applications, and vital considerations for selecting the most suitable option.

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Galvo Galvanometer Scanner and Its Applications

Galvo scanners utilize rotating mirrors driven by galvanometer motors for rapid and precise directional control of a laser beam. They achieve high-speed angular displacement of the beam, particularly in laser marking, engraving, and cutting, where swift and accurate beam positioning is critical. In addition to material processing, galvo scanner technology plays a pivotal role in medical imaging, notably in confocal microscopy, enabling quick and high-resolution scanning that contributes to advancements in medical diagnostics and research.

Some Galvo laser scanners feature closed-loop control systems to ensure accuracy and repeatability; however, not all scanners incorporate this technology. Closed-loop control systems are essential in applications requiring high precision, such as micro-machining and 3D printing. Incorporating closed-loop control systems significantly enhances the performance of galvo scanners, making them indispensable in various precision-critical industries.

Key Considerations for Selecting Galvo Scanners

1. Speed and Precision Requirements

The speed of a galvo scanner is determined by the inertia of the galvo/mirror and the resonant frequency, which is measured as the time taken to reach 99% of a 0.1° positioning move. High-speed galvo scanners are crucial in precision-demanding applications, reducing marking time in tasks like laser marking to boost productivity. Precision is essential in micro-machining, as even minor discrepancies can lead to defects. Accuracy is assessed through short-term repeatability, vital for tasks like alphanumeric character marking, where speed is measured in characters per second. Generally, higher accuracy in galvo systems comes at a higher cost.

2. Laser Processing Requirements

Different laser processing tasks may have specific and diverse requirements. Understanding the particular needs of your application is essential, taking into account factors such as:

Marking

For applications involving marking, the galvo mirror system must offer precise control over the laser beam to create clear and legible marks. Evaluate the scanner's capability to handle intricate designs, logos, and alphanumeric characters accurately.

Engraving

Engraving tasks require a galvo scanner head that can produce deep and detailed markings. The scanner's ability to control laser power and focus is crucial for achieving varying depths and complex patterns in the engraving process.

Cutting

In laser cutting applications, the galvanometer scanning mirror must provide rapid and precise movements to ensure clean and accurate cuts. Factors such as beam stability, acceleration, and deceleration are vital for achieving top-quality cutting results.

3. Image Quality of the Galvo Mirror Scanner

The image quality of a galvo scanner is linked to its resolution and linearity. Higher resolution allows for finer control over the laser's movement in high-density and precise patterning. Linearity refers to the scanner's ability to maintain performance across its scanning range, which is essential for uniform image quality, especially in large-field applications. Current scanners use feedback systems and correction algorithms for linearity, ensuring consistent quality throughout the scan field.

SOING's 2D Galvo Scanner for High-Speed Processing

SOING is renowned for supplying galvo scan heads to China's leading high-speed marking machine providers, characterized by precision technology and robust product design. Let’s discuss the features of the SPS Series Scanner from SOING.

High-Speed Performance

The SPS Series Scanner, specifically the SPS 85H, writes characters per second, demonstrating remarkable processing speed. This efficiency is crucial in electronic component marking and packaging, as time efficiency enhances production. For instance, in an 8-hour shift, this speed enables marking large batches of goods while reducing turnaround time.

Connectivity and Integration

The SPS Series features top-cap and back-cable IDC connections for flexible integration. This dual connectivity is advantageous in various industrial settings with different spatial and wiring requirements. The wiring configuration with the top cover varies from other designs, adding an extra layer of protection. Given that high-speed galvanometric mirrors often operate continuously in factories, this protective cover is a vital defense against corrosion and dirt. Conversely, the back-cable connection follows the standard wiring configuration.

Versatile Input Beam Aperture

The SPS Series includes input beam apertures of 8.5mm, 10mm, and 14mm for various laser types and applications. The 14mm aperture is ideal for broad marking, while the 8.5mm is suited for fine detail. Industries such as automotive and aerospace require accurate marking across various component sizes, making this adaptability essential.

Robust Build Quality

The SPS Series is designed for performance in harsh industrial environments, featuring waterproof and dustproof construction. In sectors like metal production and pharmaceuticals, exposure to elements can adversely affect marking operations, making this durability crucial. A robust build enhances the scanner's lifespan and preserves performance, ultimately saving maintenance time and costs.

Conclusion

SOING, with extensive experience, offers high-performance RF-excited CO2 lasers and innovative motion control solutions. Their motion control division specializes in galvo scanners, exemplified by the high-speed SPS Series designed for on-the-fly marking. Complementing their laser processing solutions, the optical department provides a comprehensive range of products, including f-theta lenses, telecentric lenses, beam expanders, and mirrors. Discover cutting-edge laser processing technologies and SOING's commitment to innovation.

Reference

[1] PRODUCT FOCUS: GALVANOMETER SCANNERS: What you need to know to buy a galvo-positioner. Available at https://www.laserfocusworld.com/optics/article//product-focus-galvanometer-scanners-what-you-need-to-know-to-buy-a-galvo-positioner (Accessed on February 2nd).