source:Industry News release time:2021-09-13 Article author:sznbone Popular:pcb
Almost all printed circuits are required to be printed on the PCB circuit board, with names to identify components, circuits, test points and the printed board itself. The circuit board factory also attaches great importance to this aspect. With curiosity, we walked into the circuit board factory to understand the little knowledge related to printed circuit signs and identification.
In the production of PCB circuit boards, the name can be printed after the printed board is etched, or etched out at the same time as the circuit is etched. If it is printed later, it is usually printed with a silk screen omission process, or stamped with a stamp. In either case, in order to ensure the electrical and chemical properties, the marking material must be carefully selected. Taking into account this principle and some additional process steps involved, usually the designer must have a name on its photographic base map, and etch it out at the same time as the circuit is etched. Although these names are conductive, they generally do not cause problems. The handwriting of the names should be small enough to withstand etching and be clearly visible. The thickness of the copper foil and the position of the name relative to the wire will determine how much the name will be damaged during etching. When using 2 ounces of 3 ounces of copper foil, the name is not clear when it is made very small.
PCB circuit board
In order to facilitate the testing and maintenance of a printed board assembly, as well as to facilitate the visual inspection of the assembly with drawings and data, the reference name mark of the component should be considered. In addition to the reference name sign, the polarity of capacitors and diodes should be pointed out, and they should be marked as close as possible to their mounting holes. The reference name and polarity should be completely visible where the components are placed. The No. 1 lead of the dual in-line integrated circuit should always be marked, and the TO-5 type integrated circuit with the 6, 8, 10 or 12 lead should also be marked.
Printed circuit boards should have two identification marks of different nature, because before the assembly of electrical components, the manufacturer has to machine and plate the printed board, which requires the use of documents and a method of identifying the printed board. One is the manufacturing drawing number of the printed PCB circuit board (original drawing number), and the other is the number of the printed PCB circuit board assembly should also be marked on the component side. The electrical components are assembled on this component side and replaced Spare components are usually tested and repaired here. The number should always be edited by pressing "ASSYNO". In addition, in order to find, the printed board assembly must be numbered consecutively. If space permits, your company name can be displayed on the printed board. All these requirements are easy to do with the etching foil method.
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