What Is a Main Circuit Board?

The names of circuit boards are: ceramic circuit boards, alumina ceramic circuit boards, aluminum nitride ceramic circuit boards, circuit boards, PCB boards, aluminum substrates, high frequency boards, thick copper boards, impedance boards, PCBs, ultra-thin circuit boards, Thin circuit boards, printed (copper etch technology) circuit boards, etc. The circuit board miniaturizes and visualizes the circuit, and plays an important role in the mass production of fixed circuits and the optimization of the layout of electrical appliances. The circuit board can be called a printed circuit board or a printed circuit board. The English name is (Printed Circuit Board) PCB, (Flexible Printed Circuit board) FPC circuit board (FPC circuit board, also known as flexible circuit board) Or polyester film as a substrate is a kind of highly reliable, excellent flexible printed circuit board. It has the characteristics of high wiring density, light weight, thin thickness, and good flexibility.) And soft and hard Reechas (Soft and hard combination plate)-The birth and development of FPC and PCB has given birth to a new product called soft and hard combination plate. Therefore, the soft-hard board is a flexible circuit board and a rigid circuit board, which are combined according to relevant process requirements after pressing and other processes to form a circuit board with FPC characteristics and PCB characteristics.

The circuit board is divided by the number of layers

FR-1: Flame retardant coating

Domestic pair

1. Chip with program

1. EPROM chips are generally not damaged. Because this chip requires ultraviolet light to erase the program, it will not damage the process during the test

The circuit board is mainly composed of

The circuit board system is classified into the following three types:

According to the characteristics of the material of the circuit board and the widely used field, in order to save volume and achieve certain accuracy more effectively, the characteristics of the three-dimensional space and thin thickness are better applied to digital products, mobile phones and notebook computers. Recommended instruments for circuit board (FPC) inspection are

The circuit board includes many types of working layers, such as signal layer, protective layer, silk screen layer, internal layer, etc.

The basic design process of the circuit board can be divided into the following four steps:

PCB manufacturing technology, including computer-aided manufacturing processing technology, namely CAD / CAM, and light drawing technology. Now introduce the computer-aided manufacturing process technology

Computer-aided manufacturing ( CAM ) is based on various processes for various processes. For the various process requirements mentioned above, the necessary preparations must be made before light painting. For example, problems such as mirroring, solder mask expansion, process lines, process frames, line width adjustment, center holes, and contour lines must be addressed.

CAM this process to complete. Special attention should be paid to the need to deal with the small space in the user file. Because each factory's process flow and technical level are different, to meet the final requirements of the user, the necessary adjustments must be made in the production process to meet the user

Relevant requirements such as accuracy. Therefore, CAM processing is an indispensable process in modern printed circuit manufacturing.

What CAM does

Pad size correction, combined D code.

Correction of line width, combined D code.

Check the minimum spacing, between pads and pads, between pads and lines, and between lines.

Check the size of the aperture.

Inspection of minimum line width.

Determine the solder mask expansion parameters.

Mirroring.

Add various craft lines and craft boxes.

Line width correction for side erosion correction.

forms a central hole.

Add shape corners.

Add positioning holes.

Imposition, rotation, mirroring.

Pattern.

graphics superposition processing, tangent tangent processing.

Add user trademark.

Organization of CAM process

Because there are dozens of popular CAD softwares on the market, the management of CAD processes must start with the organization, and a good organization will achieve more results with less effort.

Since the Gerber data format has become the standard in the light painting industry, Gerber data should be used as the processing object in the entire light painting process. If CAD data is used as an object, the following problems will occur.

There are too many types of CAD software. If various process requirements are to be completed in the CAD software, each operator is required to be proficient in the operation of each CAD software. This will require a long training period for the operator to become a skilled worker and to meet actual production requirements.

This is not cost-effective from a time and economic perspective.

Due to the numerous process requirements, some requirements cannot be realized for some CAD software. Because CAD software is used for design, it does not take into account the special requirements in the process, so it cannot meet all the requirements. The CAM software is specifically used for process processing.

Doing these jobs is the best.

CAM software is powerful, but all of them operate on Getber files, but cannot operate on CAD files.

If CAD is used for process processing, each operator is required to be equipped with all CAD software, and each CAD software has different process requirements. This will cause unnecessary confusion in management.

In summary, the CAM organization should have the following structure (especially large and medium-sized enterprises).

All the processes are unified with Gerber data as the processing object.

Each operator must master the skills of converting CAD data into Gerber data.

(3) Each operator must master the operation method of one or several CAM software.

Develop uniform process specifications for Gerber data files.

The CAM process can be handled relatively centrally by several operators for easy management. Reasonable organization will greatly improve management efficiency, production efficiency, and effectively reduce the error rate, thereby achieving the effect of improving product quality.

Circuit board repair is an emerging repair industry. The degree of automation of industrial equipment is getting higher and higher, so the number of industrial control boards in various industries is also increasing. After the industrial control board is damaged, the high cost required to replace the circuit board (a few thousand yuan, as many as tens of thousands or Hundreds of thousands of yuan) has also become a headache for enterprises. In fact, most of these damaged circuit boards can be repaired in China, and the cost is only 20% -30% of the cost of buying a new board, and the time it takes is much shorter than the time for fixing the board abroad. The basics of circuit board repair are introduced below.

Almost all circuit board repairs have no drawing materials, so many people are skeptical about circuit board repairs. Although various circuit boards vary widely, the same thing is that each circuit board is made of various integrated blocks, resistors, capacitors, and The other components are composed, so the damage of the circuit board must be caused by the damage of one or some of the components. The idea of circuit board repair is based on the above factors. Circuit board maintenance is divided into two parts, inspection and maintenance, of which inspection occupies a very important position. Check the basic knowledge of each device on the circuit board until the bad parts are found and replaced, then a circuit board is repaired.

Circuit board inspection is to check every

Circuit board is the most active industry in the contemporary electronic component industry, and its growth rate is generally about 3 percentage points higher than that of the electronic component industry.

Printed circuit board

The printed circuit board is the most active industry in the contemporary electronic component industry, and its growth rate is generally higher than the electronic component industry by about 3 percentage points. It is expected that 2006 will still maintain rapid growth. Demand upgrading and industrial transfer are the basic driving forces for the development of the industry. HDI boards, flexible boards, IC packaging boards (BGA, CSP) and other varieties will become the main growth points.

In 2003, the output value of China's printed circuit boards was 50.069 billion yuan, an increase of 333% year-on-year, and the output value surpassed the United States, which ranked second in the world for the first time. In 2004 and 2005, China's PCB output value still maintained a growth rate of more than 30%, and it is estimated that it reached 86.9 billion yuan in 2005, which is much higher than the growth rate of the global industry.

Flexible circuit board

Flexible circuit boards are rapidly developing toward miniaturization in electronic devices such as smart phones, and are therefore widely used in many market segments for electronic devices. On the one hand, products tend to be miniaturized; on the other hand, they are reliable. It is estimated that by 2016, the global flexible circuit board output value will reach 13.2 billion US dollars, with a compound annual growth rate of 7.5%. The survey has become one of the fastest growing sub-industries in the electronics industry.

From the perspective of development forms, China's circuit board industry has continued to grow at a high speed, and imports and exports have also achieved rapid growth. With the growth of the industry, it is gradually being optimized and improved. ^[4]