Laser marking equipment and focusing method thereof

Abstract

The invention provides laser marking equipment and a focusing method thereof. The method comprises the following steps of roughly adjusting the distance between a focusing lens and a positioning zeropoint according to a first correction amount and acquiring a first marked graph; finely adjusting the distance between the focusing lens and the positioning zero point according to a second correctingamount when confirming that a first graph parameter of the first marked graph corresponding to a to-be-determined focus position is optimal; determining a second compensation amount corresponding tothe to-be-determined focus position as a focus compensation amount when confirming that the difference value between second pattern parameters of each of second marked graphs corresponding to each ofpattern distribution positions is smaller than a preset difference value threshold value and the second graph parameters of the second marked graphs corresponding to the to-be-determined focus position is optimal; and adjusting the focusing lens to the focus point position of the to-be-determined focus position according to the focus compensation amount. According to the equipment and the method,the accuracy of determining the focus point of the laser marking equipment is greatly improved, the operation is simple and convenient, and the operation stability of equipment is improved.

Description

technical field [0001] The invention belongs to the technical field of laser marking, and more specifically relates to a focusing method for laser marking equipment. Background technique [0002] When the laser marking equipment respectively marks the marking positions A and B on the marking plane, due to the ideal laser focus, there is only one and the thinnest focus point (that is, the focal point), but between A and B When the points are marked separately, the focal length corresponding to the laser focus of the two marking positions will change. At this time, if the marking position is switched but the focus position does not change accordingly, the marking plane will not work at the optimal focus. , which will lead to thicker marking lines or poor marking effect. refer to Figure 8 After the laser beam emitted by the laser 1 in the laser marking device in the prior art passes through the focusing lens 21 and the focusing lens 3 in sequence, it is deflected by the galva...

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Problems solved by technology

The disadvantages of this solution are: firstly, due to factors such as machining assembly error and hand wheel lubrication performance, it is desired to manually adjust the hand wheel 7 to make the adjustment error of the final focus position conform to the standard error range (within 0.1mm) It is difficult to realize, and at the same time, the problem of how to adjust the coordinates of the specific focus position on the marking plane 6 is not given in this scheme; further, after the adjustment of the focus height of the focus position is completed, if the

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