The working principle of printed circuit board
The circuit board can be called a printed circuit board or a printed circuit board, and the English name is (Печатная плата) Печатная плата, Flexible Printed Circuit Board (FPC circuit board, also known as flexible circuit board flexible circuit board), or a polyester film is a kind of high reliability, excellent deflection printing circuit board. The name of the circuit board is: ceramic circuit board, aluminum aluminum ceramic circuit board, aluminum nitride ceramic circuit board, Огромная плата, Пекартная плата, алюминиевая подложка, высокочастотная плата, толстая медная пластина, доска импеданса, Печатная плата, ультратонкая печатная плата, ультратонкая печатная плата, печать (технология резьбы по меди) Огромная плата, и т. д..
Working principle
The working principle of the circuit board is to use plate-based insulation material to isolate the surface conductivity layer of copper foil, so that current can flow along the pre-designed paths in various components, such as work, amplification, attenuation, modulation, demodulation, encoding, и т. д.. Функция.
композиция
The circuit board is mainly composed of pads, перфорация, монтажные отверстия, провода, компоненты, connecting Watford circuit board SMT Patch Watford circuit board, film circuit SMT Patch, filling, electric border, и т. д.. The main functions of each component are as follows:
Подушка: Металлические отверстия, используемые для приварки штифтов компонентов..
Хорчо: There are metal over -pores and non -metal pores, where metal pores are used to connect the top of the component between layers.
Монтажные отверстия: used for fixed circuit boards.
Маршрут: Медная пленка электрической сети для соединения выводов компонентов.
Plug-in: Components used between circuit boards.
Наполнять: Copper application for ground networks can effectively reduce impedance.
Electrical boundary: It is used to determine the size of the circuit board, and the components on all circuit boards cannot exceed the boundary.
Классификация
Если печатная плата разделена на три основные категории: одна панель, двойная панель, and multi-layer circuit board,
Multi-layer board: means a printed board having an insulating material having a conductive pattern layer of more than three layers and the insulating material therebetween, and the conductive pattern interconnects. Multi-layer line board is the product of the development of electronic information technology towards high speed, многофункциональный, большая емкость, большой объем, небольшой объем, тонкий, облегченное направление.
Single panel: On the most basic PCB, части сосредоточены на одной стороне, и провода сосредоточены на другой стороне. Поскольку провод появляется только с одной стороны, this Печатная плата is called a single-sided line board. Одиночные панели обычно просты и недороги., но недостаток в том, что их нельзя применять к слишком сложным изделиям.
Double panel: It is an extension of a single surface panel. Когда однослойная проводка не может удовлетворить потребности электронных продуктов, необходимо использовать двойную панель. Обе стороны имеют медное покрытие и проводку., и может использоваться для проведения линии между двумя слоями через отверстия для формирования необходимого сетевого соединения..
Circuit boards are divided into soft boards (FPC), hard boards (Печатная плата), and hard and hard binding boards (FPCB).
Working level
The circuit board includes many types of working layers, such as signal layer, protective layer, screen printing layer, inner layer, и т. д.. The role of the various levels is briefly described as follows:
(1) Protective layer: It is mainly used to ensure that there is no need to be plated on the circuit board, which is not plated, thus ensuring the reliability of the circuit board. Среди них, Top Paste and Bottom Paste are top welded layers and bottom welded layers; TOP Solder and Bottom Solder are tin paste protective layers and bottom tinpro -oachy protective layers, соответственно.
(2) Signal layer: It is mainly used to place components or wiring. Protel DXP usually contains 30 intermediate layers, то есть. Mid Layer1 ~ Mid Layer30. The middle layer is used to arrange signal lines, and the top and bottom layers are used to place metal components or copper.
(3) Silk printing layer: It is mainly used to print the flowing water number, production number, and company name of the component on the circuit board.
(4) Internal layer: It is mainly used as a signal wiring layer.
(5) Other layers: mainly includes 4 types of layers.
Drill Guide : It is mainly used for drilling on the circuit board.
Keep-out layer : It is mainly used to draw the electrical boundary of the circuit board.
Drill Drawing: It is mainly used to set the shape of the drill.
Многослойный : It is mainly used to set up multi-faceted layers.
