Multistage focusing device and method
A focus plane and preset position technology, applied in optics, optomechanical equipment, instruments, etc., can solve the problems that the focusing device cannot meet the printed circuit board, time-consuming, laborious, and costly, and achieve a compact and applicable design structure. The effect of widening the range and increasing the focusing range
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[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0030] A laser imaging system in Laser Dynamic Imaging (LDI) generally includes a laser, a focusing device, an image plane, and a lens barrel for placing a lens assembly. When LDI technology is applied to the processing of circuit boards, the printed circuit board coated with photoresist can be used as the image plane, and the exposure focal plane of the laser beam emitted by the laser can be located at different positions through the focusing device. Board-thic...
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