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Introduction to PCB Manufacturing Process

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a, Collocation:

PCB design is completed because the PCB board shape is too small to meet the requirements of the production process, or a product consists of several pieces of PCB, so you need to put together a number of small board into an area that meets the production requirements of the board, or a product used in a number of PCB put together to facilitate the production of the installation. The former is similar to the stamp board, which can meet the PCB production process conditions also facilitate the installation of components, and then separated when used, very convenient; the latter is a product of a number of sets of PCB boards assembled together, so that it is easy to produce, but also to facilitate a product Qi set, clear and unambiguous.

b, Data Generation:

PCB board production is based on the film plate. Early production of film plate, you need to first produce a film base map, and then use the base map for photography or reprinting. The accuracy of the negative must be in accordance with the requirements of the printed circuit board, and consideration should be given to compensating for deviations caused by the production process. Negative drawings can be provided by the customer can also be produced by the manufacturer, but the two sides should be close cooperation and negotiation, so that it can not only meet the user's requirements, but also to adapt to the production conditions. In the case of the user to provide the base map, the manufacturer should test and approve the base map, the user can assess and approve the original or the first printed board products. Base map production methods are hand-drawn, paste and CAD mapping. With the development of computer technology, printed circuit board CAD technology has made great progress, the level of production process of printed circuit boards also continue to multi-layer, fine wire, small aperture, high-density direction of rapid improvement, the original film plate process has been unable to meet the needs of the design of the printed circuit boards, and then appeared in the light drawing technology. The use of light painting machine can be directly to the CAD design of PCB graphics data files into the light painting machine computer system, control the light painting machine using light to draw graphics directly on the negative. Then after developing and fixing to get the film negative. The use of light painting technology produced by the printed circuit board film plate, fast, high precision, good quality, and to avoid human error that may occur in the manual mapping or drawing of the negative, greatly improving the efficiency of the work, shorten the production cycle of the printed circuit board. Laser light painting machine, in a very short time can be completed in the past many people a long time to complete the work, and its drawing of fine wire, high-density negative plate is also unmatched by manual operation. According to the different structure of the laser light painting machine, can be divided into flatbed type, internal roller drum type (Internal Drum) and external roller drum type (External Drum). The standard data format used by the optical drawing machine is Gerber-RS274 format, which is also the standard data format in the printed board design and production industry. the Gerber format is named after the pioneer in the design and production of the optical drawing machine - the American Gerber Company. The production of optical drawing data, CAD software design data generated by the conversion known as optical drawing data (mostly Gerber data), through the CAM system for modification, editing, completion of the optical drawing pre-processing (collocation, mirroring, etc.), so that it reaches the requirements of the production process of the printed circuit board. Then the processed data into the light painting machine, the light painting machine raster (Raster) image data processor converted to raster data, this raster data through the high-fold fast compression reduction algorithms sent to the laser light painting machine, complete the light painting.

PCB Manufacturing Process

c, Optical Drawing Data Format:

Light drawing data format is based on the vector type light drawing machine data format Gerber data as the basis for the development of the vector type light drawing machine data format, and the expansion of the data format, and is compatible with the HPGL Hewlett-Packard plotter format, Autocad DXF, TIFF, and other specialized and general graphics data format. Some CAD and CAM development vendors have also extended Gerber data.The following is a brief introduction to Gerber data, the official name of the Gerber data for the Gerber RS-274 format. Each symbol on the code disk of a vectorial light plotter has a corresponding D-code (D-CODE) in the Gerber data. In this way, the light plotter is able to control and select the code disk through the D-CODE to draw the corresponding graphics. D-code and D-code corresponding to the shape of the symbol, the size of the list, that is, to obtain a D-code table. This D-code table becomes a bridge from the CAD design to the light painting machine to utilize this data for light painting. Users in the provision of Gerber photolithography data at the same time, must provide the corresponding D code table. In this way, the light painting machine can be based on the D code table to determine which symbol disk should be selected for exposure, so as to draw the correct graphics. In a D-code table, it should generally include the D-code, the shape and size of the disk corresponding to each D-code, and the exposure method of the disk.

Xinchenger Electronics specializes in the production of 2-36 layers of high frequency PCB circuit boards, and can expedite the production of PCB boards, high frequency boards, special circuit boards, microwave RF boards, high frequency antenna boards, and other products, standing Rogers, TACONIC, F4B, TP-2, FR-4 and other boards.

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