Narrow-space laser marking method and marking machine thereof

Abstract

The invention discloses a narrow-space laser marking method which is characterized by comprising the steps that a completely-reflecting mirror which forms the angle of 45 degrees with a laser optical axis is placed inside the focal distance of an F-theta lens set below the F-theta lens set of a laser marking machine, and the sum of the distance between the marking surface of a marked workpiece and the intersection point of the completely-reflecting mirror and the laser optical axis and the distance between the F-theta lens set and the intersection point of the completely-reflecting mirror and the laser optical axis is equal to the focal distance length of the F-theta lens set. The narrow-space laser marking machine comprises a laser device system, an expanded-beam lens set, a lens vibration head, the F-theta lens set, a computer control system and the completely-reflecting mirror. After passing through the expanded-beam lens set, laser output by the laser device system enters a laser incident hole in the lens vibration head. The F-theta lens set is installed in a laser emergent hole in the lens vibration head. The completely-reflecting mirror is installed below the F-theta lens set inside the local distance of the F-theta lens set and forms the angle of 45 degrees with the laser optical axis. According to the narrow-space laser marking method and the narrow-space laser marking machine, laser marking can be carried out the workpiece with the narrow space above the surface to be marked.

Description

technical field [0001] The invention relates to a laser marking method and equipment, in particular to a narrow space laser marking method and a marking machine thereof. Background technique [0002] Laser marking is the use of high-energy laser beams to irradiate the surface of the workpiece, and the light energy is instantly converted into heat energy, so that the material on the surface of the workpiece can be evaporated rapidly, so that any required text and graphics can be carved on the surface of the workpiece as a permanent mark. For metal, plastic, glass, wood, leather and other materials. [0003] A high-speed laser marking machine with patent application number 02228748.5. It includes laser system, beam expander lens group, vibrating lens, F-θ lens group and computer control system. The oscillating head is driven by a computer-controlled two-dimensional servo motor to rotate two mirrors at high speed, high precision, and short vector, so that the laser beam enter...

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Problems solved by technology

[0004] Although the patent application number is 02228748.5 high-speed laser marking machine provides a fast marking method and equipment, but because the vibrating head of this marking machine is composed of a two-dimensional servo motor and a mirror, plus the F- The θ lens group has a relatively large size, and the focal length of the F-θ lens group is all above 100mm. Generally, the size of the vibrating lens and the F-θ lens group plus the focal length of the F-θ lens group is greater than 350mm. That is to say, if a workpiece is to be marked, there must be a space of more than 350mm above the marking surface. Therefore, ordinary laser marking machines are helpless for narrow spaces or places that need to be marked with special requirements for marking positions. For example, on the inner wall of the inner pot of the household electric cooker, the reference scale line for the user to cook and hold water should be engraved. Marking

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