810-002895-002 电路板模块

Description

810-002895-002 电路板模块

PCB(printed circuit board)即印制线路板，简称印制板，是电子工业的重要部件之-。几乎每种电子设备,小到电子手表、计算器，大到计算机、通信电子设备、军用武器系统，只要有集成电路等电子元件，为了使各个元件之间的电气互连，都要使用印制板。印制线路板由绝缘底板、连接导线和装配焊接电子元件的焊盘组成，具有导电线路和绝缘底板的双重作用。它可以代替复杂的布线，实现电路中各元件之间的电气连接，不仅简化了电子产品的装配、焊接工作，减少传统方式下的接线工作量，大大减轻工人的劳动强度;而且缩小了整机体积，降低产品成本,提高电子设备的质量和可靠性。

印制线路板具有良好的产品一致性，它可以采用标准化设计，有利于在生产过程中实现机械化和自动化。同时，整块经过装配调试的印制线路板可以作为一个独立的备件，便于整机产品的互换与维修。目前，印制线路板已经极其广泛地应用在电子产品的生产制造中。

印制线路板最早使用的是纸基覆铜印制板。自半导体晶体管于20世纪50年代出现以来，对印制板的需求量急剧.上升。特别是集成电路的迅速发展及广泛应用，使电子设备的体积越来越小，电路布线密度和难度越来越大，这就要求印制板要不断更新。目前印制板的品种已从单面板发展到双面板、多层板和挠性板;结构和质量也已发展到超高密度、微型化和高可靠性程度;新的设计方法、设计用品和制板材料、制板I艺不断涌现。近年来,各种计算机辅助设计(CAD)印制线路板的应用软件已经在行业内普及与推广，在专门化的印制板生产厂家中，机械化、自动化生产已经完全取代了手工操作。

PCB在电子设备中具有如下功能。
(1 )提供集成电路等各种电子元器件固定、装配的机械支承，实现集成电路等各种电子元器件之间的布线和电气连接或电绝缘，提供所要求的电气特
性。

(2)为自动焊接提供阻焊图形,为元器件插装、检查、维修提供识别字符和图形。

(3)电子设备采用印制板后，由于同类印制板的一致性，避免了人工接线的差错,并可实现电子元器件自动插装或贴装、自动焊锡、自动检测，保证了电子产品的质量，提高了劳动生产率、降低了成本,并便于维修。

(4)在高速或高频电路中为电路提供所需的电气特性、特性阻抗和电磁兼容特性。

(5)内部嵌入无源元器件的印制板，提供了-定的电气功能，简化了电子安装程序，提高了产品的可靠性。

(6)在大规模和超大规模的电子封装元器件中，为电子元器件小型化的芯片封装提供了有效的芯片载体。

810-002895-002 电路板模块

PCB(printed circuit board) is a printed circuit board, referred to as printed board, is an important part of the electronics industry. Almost every electronic device, small to electronic watches, calculators, large to computers, communication electronic equipment, military weapon systems, as long as there are electronic components such as integrated circuits, in order to make the electrical interconnection between the various components, to use printed boards. The printed circuit board is composed of an insulating base plate, a connecting wire and a welding pad for assembling welded electronic components, and has the dual function of conducting circuit and insulating base plate. It can replace the complex wiring, realize the electrical connection between the components in the circuit, not only simplifies the assembly of electronic products, welding work, reduce the traditional way of wiring workload, greatly reduce the labor intensity of workers; It also reduces the volume of the whole machine, reduces the cost of the product, and improves the quality and reliability of the electronic equipment.

The printed circuit board has good product consistency, and it can adopt standardized design, which is conducive to mechanization and automation in the production process. At the same time, the whole assembled and adjusted printed circuit board can be used as an independent spare part, which is convenient for the exchange and maintenance of the whole machine product. At present, printed circuit boards have been extremely widely used in the manufacturing of electronic products.

The earliest use of printed circuit boards is paper-based copper-coated printed boards. Since the advent of semiconductor transistors in the 1950s, the demand for printed boards has skyrocketed. Go up. In particular, the rapid development of integrated circuits
Widely used, the size of electronic equipment is getting smaller and smaller, and the circuit wiring density and difficulty are getting greater and greater, which requires printed boards to be constantly updated. At present, the variety of printed boards has developed from single panel to dual panel,
Multilayer and flexible plates; The structure and quality have also been developed to ultra-high density, miniaturization and high reliability; New design methods, design supplies and board making materials, and board making techniques continue to emerge. In recent years, a variety of computer aided design (CAD) printed circuit board application software has been popularized and promoted in the industry, in specialized printed board manufacturers, mechanized, automated production has completely replaced manual operation.

PCB has the following functions in electronic equipment.
(1) Provide mechanical support for fixing and assembling various electronic components such as integrated circuits, realize wiring and electrical connection or electrical insulation between various electronic components such as integrated circuits, and provide the required electrical characteristics
Sex.

(2) Provide solder resistance graphics for automatic welding, and provide identification characters and graphics for component insertion, inspection and maintenance.

(3) Electronic equipment after the use of printed boards, due to the consistency of similar printed boards, to avoid manual wiring errors, and can achieve automatic insertion or mounting of electronic components, automatic soldering, automatic detection, to ensure the quality of electronic products, improve labor productivity, reduce costs, and easy maintenance.

(4) To provide the circuit with the required electrical characteristics, characteristic impedance and electromagnetic compatibility characteristics in high speed or high frequency circuits.

(5) Printed boards embedded with passive components provide a fixed electrical function, simplify electronic installation procedures, and improve product reliability.

(6) In large-scale and ultra-large-scale electronic packaging components, it provides an effective chip carrier for the miniaturized chip packaging of electronic components.