Introduction to the advantages of 3D dynamic scanning system
The three-dimensional dynamic scanning system and the 3D dynamic scanning system belong to the perfect combination of the rear focus scanning system and the mechanical transmission device. It can achieve the characteristics of uniform large-format marking spot and small focusing spot.
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In the traditional front-focus scanning system, the scanning galvanometer is placed in front of the focusing eyepiece (such as the normal focusing lens and the telecentric scanning lens), and a flat scanning field is obtained at the focal plane of the eyepiece. This system has low cost, The scanning speed is faster, but the size of the scanning field and the quality of the spot are severely limited by the lens design.
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Different from the front-focus scanning system, in the three-dimensional dynamic scanning system, the scanning galvanometer is placed behind the focusing lens. The focusing lens system consists of a movable beam expander lens and a focusing lens group. The laser beam enters the expander first The beam lens enters the focusing lens group, and then is reflected by the scanning galvanometer before reaching the focal plane. Using a transmission device to move the beam expander lens along the optical axis will change the distance between the beam expander lens and the focus lens group , So that the position of the focused spot can be changed in two-dimensional or three-dimensional space, which is called "three-dimensional scanning." Focus on the distance between the lens groups to achieve.
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A three-dimensional dynamic scanning system usually has the following advantages:
1. A set of systems can achieve the scanning range from 100 mm x 100 mm to 2000 mm x 2000 mm;
2. Compared with the front focusing system, a smaller focusing spot can be obtained;
3. It can improve the uniformity of the focused spot.
Use: The laser beam enters the beam expander first, then enters the focusing lens, and then reaches the focusing surface through the reflection of the scanning galvanometer. The transmission device can move the beam expander along the optical axis, and by changing the distance between the beam expander and the focusing lens, the position of the light spot can be changed in two-dimensional or three-dimensional space.
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