Method and device marking invisible two-dimensional code on surface of metal material through laser

Abstract

The invention discloses a method and device marking an invisible two-dimensional code on the surface of a metal material through a laser. The device comprises a marking system, a laser device, a control system, a beam expander, a galvanometer system, an f-theta lens, an industrial camera system and a code reading system. The laser pulse width of the laser device is 1-100 ns. The nominal focal length of a camera lens of the f-theta lens is no larger than 160 nm. According to the laser marking device based on innovation, by controlling the pulse width of the laser and the dot diameter and the dot distances of a two-dimensional code dot matrix, the invisible two-dimensional code which cannot be seen by human eyes is marked on the metal material, photographing and reading of the invisible two-dimensional code are achieved through the industrial camera system and the code reading system, and therefore the invisible anti-fake function is achieved. The marking method cannot damage the surface of the material, the invisible two-dimensional code has no hand feeling and does not affect the appearance, permanent marking can be achieved, the processing process is free of pollution, no chemical needs to be used, and cost is low.

Description

technical field [0001] The invention relates to the technical field of laser processing, in particular to a method and equipment for marking an invisible two-dimensional code on the surface of a metal material by using a laser. Background technique [0002] With the changes in consumer electronics market demand, metal materials including aluminum alloys are more and more widely used in electronic products, making laser processing more and more used in marking consumer electronics products. The more common applications are in The product surface is marked with a QR code for product traceability. The existing laser processing technology of marking the two-dimensional code on the surface of the aluminum alloy usually destroys the surface of the material to achieve a white or dark gray two-dimensional code. This processing technology destroys the surface of the aluminum alloy material to expose the aluminum The original color of the alloy material or high-energy burning dark gr...

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Problems solved by technology

[0004] In view of the above deficiencies in the prior art, the object of the present invention is to provide a method and equipment for marking an invisible two-dimensional code on the surface of a metal material by using a laser, thereby overcoming the process of marking a two-dimensional code on the surface of an aluminum alloy with a laser in the prior art , damage the surface of the aluminum alloy material, it is difficult to remove, the appearance effect is poor, and it seriously affects the consumer's experience of the product.

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