Laser marking equipment and automatic focusing method thereof

Abstract

The invention provides laser marking equipment and an automatic focusing method thereof. The high-precision automatic focusing can be realized, and the method comprises the following steps that a positioning distance and a height distance associated with the positioning distance are acquired, and an optical equivalent distance is acquired; according to the height distance and the optical equivalent distance, the focus height of a marking plane corresponding to each positioning point is determined, and the corresponding relation between each focus height and each positioning distance is obtained; a focus height and focusing distance curve is generated according to the corresponding relation between each focus height and each positioning distance; and a focusing instruction containing a target focus height is received, a target focusing distance corresponding to the target focus height is determined from the focus height and focusing distance curve, and after the distance between the focusing lens on the guide rail and the focusing lens is adjusted to be equal to the target focusing distance, it is confirmed that the focusing is completed.

Description

technical field [0001] The invention belongs to the technical field of laser marking, and in particular relates to a laser marking device and an automatic focusing method of the laser marking device. Background technique [0002] Such as figure 1 As shown, when the laser marking equipment marks the marking positions A and B on the marking plane, the ideal laser focus has the only and the thinnest focus point, that is, the focus position. When marking point A and point B respectively, the focal length corresponding to the laser focus of the two marking positions will change. At this time, if the marking position is switched, the focus height will not change accordingly; When the marking object of a certain thickness is adjusted to the focus position for marking, if the marking object of other thickness is replaced and the original focus height remains unchanged, the point where the laser beam hits the marking plane will not be ideal. Focus point, which will lead to problems...

AI Technical Summary

Problems solved by technology

But, there is following problem in this scheme: firstly, focusing lens 21 is in figure 1 The position of the first guide rail 5 shown in the figure needs to be determined according to the focal length of the focusing lens 21 and the focusing lens 3. In view of confidentiality and other reasons, usually the debugger does not know the exact parameters of the lens focal length. The stroke of the guide rail 5 may only be based on personal experience, and the handwheel needs to be operated repeatedly; at the same time, due to the possible processing and assembly errors of the focusing lens 21 and the focusing lens 3, the actual value of the focal length of the focusing lens 21 and the focusing lens 3 may be different from the design. Values ​​are different, resulting in inaccurate calculation values; moreover, in practical applications, for different types of products, the thickness of marking objects often changes, and repeated marking and debugging are required. Not only the workload is heavy, but the operation process is cumbersome, it may also affect Focus effect

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