PCB Technical - PCB manufacturers introduce what OEM manufacturers have

Where do OEM manufacturers find it? Circuit board proofing refers to the trial production of printed circuit boards before mass production. It is mainly used in the process of electronic engineer designing and completing the circuit board and then going to the factory for small batch trial production, that is, circuit board proofing. The production volume of printed circuit board proofing generally does not have a specific limit. Before the product design is confirmed and tested, it is called printed circuit board proofing by engineers.
The method of judging the quality of the PCB circuit board: distinguish the quality of the circuit board from the appearance. Analyze and judge through three aspects; standard rules for size and thickness. The thickness of the circuit board is different from that of the standard circuit board. Customers can measure and check the thickness and specifications of their own products.
2. Proofreading issues
1. Speed
Products in the PCB market are constantly changing. In this industry, time is a very important factor. Delivery time and quality are the hard power of factories, and they are also favored by engineers and factories. Now the circuit board factory generally provides expedited service, and the normal delivery time of the fast factory is also 2 days. For example, in the Yangtze River Delta region, the emerging Czech Republic has promised not to increase any reminder fees, and all models are rushed by default. For example, single-sided and double-sided panels, large-scale proofing and small batches, less than or equal to 30 pieces, with an area of more than 1 square meter, can now be shipped within 24 hours! It turned out to be 2-3 square meters. The delivery time for small batches of 1-5 square meters is changed to 72 hours (originally 3-4 days), and all orders are mailed by SF Express. Another example is the old models of Huaqiang, Jie Duobang, Jia Licheng, etc.
2. Quality
It is an engineer's trial production stage before PCB product design confirmation and testing, and its quality cannot be ignored. From raw materials, surveying and mapping, to production, testing, and quality control, every link needs to be strictly checked. For example, ordinary double-sided panels, the plates generally include FR-4, aluminum substrate, CEM-1, etc., and the thickness of the plate is between to
The thickness of copper is ounces to ounces. Different materials lead to great differences in quotations. At present, the better material used by the manufacturer is the imported Shengyi board.

3. Price
Where are Changsha manufacturers for OEM matching processing? With the development of the industry, the prices of PCB proofing and small and medium batch production are falling. At present, many proofing companies, such as Jetpo, cancel all proofing/small batch film fees, and movie fees have also withdrawn from the stage of history. Completing challenging tasks at a challenging price will be the price trend of PCB proofing in the future.
Immersion gold is a thick layer of nickel-gold alloy with good electrical properties on the copper surface, which can protect the PCB for a long time; in addition, it also has environmental tolerance that other surface treatment processes do not have. In addition, immersion gold can also prevent the dissolution of copper, which will benefit lead-free assembly.
4. Pavement measurement
1 In a high temperature environment, the copper sheet is not easy to fall off;
2 The line thickness, line spacing, and line width of the line meet the design requirements to prevent the line from heating, short-circuiting, and open circuit;
3. The PCB board has no additional electromagnetic radiation;
4 Special environments such as high temperature and high humidity are considered during the proofing process of printed circuit boards;
5 The copper surface is not easy to oxidize, which affects the installation speed, and can not be used for a long time after oxidation;
6 It should be ensured that the plate shape is not deformed to avoid dislocation of the screw holes after installation. Mechanical installation is currently used. The hole position of the circuit board and the deformation error of the circuit design should be within the allowable range.
Circuit board production process: drilling. Purpose: According to the engineering data, drill the required aperture at the corresponding position on the sheet material that meets the required size. Process: stacked board pin - upper board - drilling - lower board - inspection\repair.
Combining the above six aspects, you can judge whether the printed circuit board is "excellent." Currently, there are tens of thousands of PCB manufacturers on the market. It is recommended that users keep their eyes open during the purchase process and make choices based on understanding the PCB.