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Scanheads
Frequently Asked Questions
Laser Scanhead is an integral part of many laser processing machines and the primary component responsible for projecting the focused output of laser radiation on the work field. They are often used in laser markers, laser engravers and laser cutters.
The primary components of a laser scanning head are galvo scanners, which provide rapid angular positioning of two orthogonally oriented mirrors and an F-Theta lens that focuses the deflected laser beam onto the work area.
An F-Theta Lens is a large aperture compound lens built in such a way that the beam deflection distance from the axis on the imaging plane is directly proportional to the focal length (F) and the incidence angle (theta). This is unlike the flat-field scanning lens where that distance would be proportional to the focal length * tan (theta) and unlike the spherical lens that generates curved projection plane.
The use of F-Theta lenses in galvo scanheads enables controlled steering of the laser’s focal spot within the work area without significant distortions (spot shape and width) and without the need of complicated compensating corrections that would be required with other lenses.
No, Laser Scan-Heads do not include the laser source. Systems that also include the laser source are often classified as the complete laser machine (e.g. laser marking machine, laser cutting machine, etc.)
A few key parameters are important to see if the scanhead will work with the particular laser or not. First, the input aperture needs to be wide enough to accommodate the laser beam with a significant margin. Second, you will need to make sure that the mirror coatings of the galvo scanners and the F-theta lens are intended for the wavelength of the laser source. Third, you will need to make sure that the optics used in the system can indeed withstand the peak powers of the laser radiation.
Many laser scanheads include powerful software capabilities that make the integration very easy. If in doubt, consult the data sheet or inquire from the supplier.
3D laser scanning is a non-contact technology of reconstructing an object’s shape in virtual space. During 3D laser scanning, a high speed scanhead projects laser lines on the object and then scans in the orthogonal direction. During the process two cameras record the reflected light and create what is referred to as the “point cloud” in the 3D space. Various software programs exist that can analyze this data of point cloud to render the 3D shape of the scanned object.
Did You know?
1 - Intro to Laser Scanning
2 - Laser Marking System: Complex Design For Elegant Patterning