Visual Laser Marking Machine, How Much Do You Know?

Visual Laser Marking Machine, How Much Do You Know?

With the development and progress of society, machine vision has gradually developed and improved. Machine vision is a novel and practical science and technology, for humans, vision is born, and effortless, but letting the machine also have vision, and improving the overall performance of the machine is a challenging job. Machine vision is widely used in automated production equipment, which can not only improve production efficiency, improve product quality, but also reduce production costs.

Machine vision usually refers to the process of a machine (generally a computer) automatically acquiring images of interest, then processing the images, and taking further "actions" after obtaining abstract information. In popular terms, machine vision is to let the machine have the ability to "see", so that the machine can recognize and understand what it wants to see, and can determine the location of the target it sees. Through cameras and computers, the machine has the function of automatically measuring, identifying and judging the target. The system composition of machine vision is shown in the figure:

Workflow of machine vision

Under the illumination of the set light source, the object in the scene generates the original digital image through the imaging equipment and sends it to the computer system; Then the image is calculated in the computer to complete the image preprocessing; At this point, the quality of the image has been improved to some extent, and then the computer extracts the features from the image with better quality, which constitutes the abstract description of the original image. Finally, the computer uses pattern recognition technology to get a higher level of abstract description. During the image processing process, can be displayed through the display, in addition, the computer can also adjust the working process according to the image processing results.

Machine vision is composed of image acquisition, image analysis, and processing, image display and output. In the image acquisition part, most machine vision systems use image sensors to detect images, which are used to convert image information into digital signals. In the part of image analysis and processing, the digital signal of the image is generally processed by computer, and various characteristic values of the image are extracted, according to which pattern recognition and coordinate calculation are carried out. In the image display and output part, the computer outputs the image or data according to the calculation results and makes various adjustments with the cooperation of the executive parts to realize the automatic process. The main modules of the machine vision system are shown as follows:

At present, machine vision technology is the most widely used in high-precision machining fields such as laser cutting, laser welding, laser marking, and laser micro-machining. The application of machine vision technology in laser marking, especially in the semiconductor and electronics industries, such as in a variety of mass production technology and equipment, a variety of chip production technology and equipment, and a variety of electronic products production and processing equipment. Often in electronic products that need to be marked, the area of the product is getting smaller and smaller, and the precision requirements are getting higher and higher. Among them, the representative is the IC (integrated circuit) technology in microelectronics technology, its integration is getting higher and higher, faster and faster, and the size is getting smaller and smaller, and the chip device has gradually developed into the mainstream product of IC, and its appearance is characterized by miniaturization.

For example, the application of laser marking machines in the semiconductor industry is mainly the surface marking of IC chips, marking the manufacturer, model, production batch, two-dimensional code, and other information on the surface of IC chips.

Then the machine equipped with a visual laser marking machine works for this scale of the device, the purpose is to mark the two-dimensional code and model information on the surface of each independent small chip, requiring that the mark is clear, the position is correct, and can not be skewed. If machine vision is not used, mechanical errors may occur and it is difficult to mark all the appropriate positions; The use of machine vision can not only clearly mark the information to the surface of the chip, but also accurately mark, prevent repetition, and position multiple products at a time, but also has dynamic adaptability, which can automatically correct the chip orientation error and ensure the marking accuracy. The application of machine vision in laser marking equipment can not only improve the grade of the equipment but also improve the marking speed.

The second is the choice of machine vision lasers. After determining the lens material, we also need to consider factors such as the power, wavelength, and mode of the laser. For most machine vision applications, you can choose infrared 808nm, 830nm, and 850nm wavelength semiconductor lasers, you can also choose visible light 405nm, 450nm, 520nm, 650nm, and other wavelengths of machine vision lasers according to your needs. And adjust its power as needed. And in special application scenarios, such as 3D imaging or precision measurement.

Can be used in the fields of automotive, production, medical, wood processing plants, microelectronics, food detection, contour, depth detection, surface defect detection, line array camera lighting, etc.

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