Method and device for controlling carving depth in real time and actively for achieving laser three-dimensional carving

Abstract

The invention discloses a method and device for controlling the carving depth in real time and actively for achieving laser three-dimensional carving. The method comprises the following steps that a light beam is emitted by a laser device and cast to the surface of a carved object, and a light spot is generated on the surface of the object; part of scattered light and reflected light of the light spot form an image on a detector through a convergent lens, an image point is formed on the detector, and as the carving depth changes, the image point, on the detector, of the light spot moves synchronously; and by detecting the movement distance h of the image point, the carving depth H, at the point, of the laser device is controlled, and when the movement distance h of the image point reaches the set value, the laser device stops emitting laser and a laser head is transversely moved to the next position on the surface of the carved object for caving. By means of the method and device, no complex image processing is needed; the method and device are not limited by material difference; the carved material is changed; and parameters such as laser powder and scanning speed are not needed to be rechecked or reset.

Description

technical field [0001] The invention relates to a method and device for actively controlling engraving depth in real time to realize laser three-dimensional engraving, and belongs to the fields of optics and laser technology and applications. Background technique [0002] Laser marking (including marking, engraving, etc.) is to control the laser focal spot to selectively irradiate the surface of the object according to the characters and graphic information to be marked, so that the material in the irradiated area is instantly heated and vaporized or photochemically reacted, thereby forming Patterns with good contrast or sharpness. Generally speaking, laser marking only requires to leave visual traces on the surface of the material, and does not require engraving depth; however, for laser engraving, it is required that the engraving pattern has a certain tactile depth to meet certain practical functions or appreciation functions, such as Seals, jewelry, decorations, etc. C...

AI Technical Summary

Problems solved by technology

[0006] It is feasible to use layered scanning method to realize three-dimensional plane engraving, and it is also a hot spot in current research. However, this method also has the following problems: 1) The process of image layering processing is relatively complicated; 2) Different engraving materials have different responses to laser light, so engraving Different materials need to re-calibrate or set laser power, scanning speed and other parameters; 3) Three-dimensional engraving is easy to achieve when the surface to be engraved is flat, but it is difficult to achieve three-dimensional engraving on the surface when the engraved surface is a curved surface or irregular fluctuations

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