Method and equipment for recognizing bar codes of inner layers of circuit boards and printing codes on outer layers of circuit boards

Abstract

The invention provides a method and equipment for recognizing bar codes of inner layers of circuit boards and printing codes on outer layers of the circuit boards. The equipment is mainly composed of a board feeding unit, an X-ray checking machine, a laser code printing host and a board collecting unit. The method comprises the steps that the X-ray checking machine is used for obtaining images of the bar codes of the inner layers of the circuit board; image analysis software is used for recognizing the content of the bar codes, and the content is transmitted to a computer host of a laser code printing unit; and meanwhile the circuit boards move to the code printing host along rollers, and the corresponding bar codes are printed on the set positions of the outer layers of the circuit boards through a laser lens. The method and equipment are used for a circuit board quality tracking management system, the content of the bar codes of the inner layers of the circuit boards is recognized, and the corresponding bar codes are printed on the outer layers of the circuit boards. The equipment is easy to operate and high in automation degree, and the production and management level of circuit board enterprises can be remarkably improved.

Description

technical field [0001] The invention relates to a method and equipment for marking circuit boards, in particular to a method and equipment for identifying barcodes on the inner layer of the circuit board and printing codes on the outer layer. Background technique [0002] Laser marking is a marking method that uses a high-energy-density laser to locally irradiate the workpiece to vaporize the surface material or undergo a chemical reaction of color change, thereby leaving a permanent mark. Laser marking can print various characters, symbols, barcodes and patterns, etc., and the character size can range from millimeters to microns. [0003] Penetrating x-rays can penetrate substances that ordinary visible light cannot. The strength of its penetrating ability is related to the wavelength of x-rays and the density and thickness of the substance to be penetrated. It is commonly used in manufacturing to detect internal defects of metal components and identify internal image inf...

AI Technical Summary

Problems solved by technology

Often there are several to hundreds of circuit boards in one lot card for one order. Because some products are very similar in appearance, circuit boards are often mixed into other batches. Because the processing parameters of different batches of circuit boards are different, once the order does not match Process parameters will cause scrap

[0005] Corresponding to the Lot card is the manual recording of production information in the workshop. You can only know which day and which process this batch of circuit boards were produced. In this way, if there is a quality problem with the product, it is impossible to find out which equipment is faulty. If any worker makes a wrong operation, when there is a problem with products involving the recall system, such as automotive panels, they can only be recalled in large quantities, and there is no way to make timely corrections to reduce losses, and there is no way to track and control them.

[0006] Printing a barcode on the edge of the circuit board can be used for production records and quality traceability, but for multi-layer circuit boards after the pressing process, the inner layer barcode is covered by resin and surface copper foil, if the inner layer barcode cannot be recognized, the inner layer and outer layer Layer-by-layer production records cannot be linked, and full-process quality traceability cannot be realized

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