6 Layer Impedance Control Rigid Flex PCB Fabrication

For a specially fileds we need to manufacturing 6 layer rigid flex pcb, for its advanced in some kinds of electronics application like LCB display etc. You can learn more about what is regid-flex PCB in here. Fabrication of  6 Layer Impedance Control Rigid Flex PCBs involves several intricate steps, which must be executed with utmost care. A minute design or manufacturing flaw can lead to overall board failure.

It is always better to prevent any design and manufacturing fault at the earliest before they escalate to major defects. By considering some standard rules you can minimize the number of defects during the fabrication of 6 layer rigid-flex PCB.

6 Layer Impedance Control Rigid Flex PCB fabrication

When manufacturing 6 layer impedance control rigid flex pcb, be remember to keep your flex ‘flexible’ using the right type and amount of materials. For example, if an application demands for a 6 layer rigid-flex PCB that should bend during the assembly and then should remain in a fixed position, you must use the right kind of copper and adhesives that allow you to do so.

It is suggested to keep circuits small. It is better to use a set of smaller circuits instead of a singular large circuit.It is not good practice to bend a flex circuit at the corners. However, some design situations demand bending at corners. In such cases, you can make a gentle curving, or use conical radius bends.

Copper used in a 6 layer rigid-flex boards has a tendency to detach from the substrate. Hence, it is essential to provide support for the copper to prevent it from detaching. Even if you are using surface mount pads and non-plated-through pads, consider using it along with some extra measures like coverlay mask to anchor pads.

It is imperative to strictly follow the recommended tolerances whenever possible.It is better to avoid laying traces over each copper layer in the same direction. It is recommended to stagger the traces to achieve even distribution of tension between copper layers.
  
It is recommended to carry a power or ground plane on a flex circuit to enhance/retain the board’s flexibility. You can consider using either solid copper pours or hatched polygons for the purpose.


In order to produce reliable rigid-flex based products, you must be careful enough to provide attention to detail. Otherwise, the final assembly may fail to provide the expected functionality and durability. These troublesome situations can be prevented by following the above mentioned recommendations. If you need to make 6 layer impedance control rigid flex PCB,inquire us anytime, we will provides better survice for you.

Source: http://www.wonderfulpcb.com/news/6-Layer-Impedance-Control-Rigid-Flex-PCB-Fabrication-657.html

The Basic Knowledge of Printed Circuit Board that We Need to Know

In our life, we can see PCB find PCB everywhere, the telephone, computer, car, radio, etc; it is a used in many electronics products. PCB looks like just a simple board, but it is a necessary part in most of the electronics products. Putting a simple PCB can make the smart phones smarter and slimmer. Comparing the machine, it has small body and takes small space in the machine; it allows the mounting of other electronic components directly on to it. So, what is PCB? Today, we are going to get some basic knowledge of PCB.


The full name of PCB is Printed Circuit Board. It has different layers, from single layer to multilayer. Printed circuit board is a non conducted board, such as plastic and glass on to it which the pattern is printed by conducting metal such as copper. This allows the current to pass only through the conducting pattern at the required rate, which is controlled by using resistors, transistors and amplifiers.



For creating a PCB, we need finish four main steps, which is designing, printing, etching and completing the board. Now, we will have a simple introduction of these four steps one by one.

Designing

Designing is the very beginning of one PCB created. For designing a PCB, we must use designing software. This step is the most important part and the function of a device is depended by how the circuit designed. But please note that if you design the circuit faultily, all of work at creating of the board might be wasted. So, the engineer must be very careful. Once the design finished, we will get a Gerber file and it will be used to build the board.

Printing

After finishing the design, we can go on and enter into printing process. This is the stage where the circuit design is stenciled on copper covered circuit board. The pattern of the circuit is created by using non corrosive ink, so that only the pattern of the circuit will be remained when the board is immersed in etching process.

Etching

Now, we are at the third stage where the board is immersed in an etching process that is a mixture of hydrogen peroxide and muriatic acid. The etching dissolves or melts away the unprotected copper coating and only the circuit design which was covered with noncorrosive ink remained. The printing which consists of lines of copper that remained on the board, this is called trances. The circuit board is finally washed in neutralizing bath or cold water to remove any traces of the remaining etching.

Drilling

Finally, the board goes into the drilling step. Drilling holes, where the components will be attached. Once this step is finished, the PCB is ready to be used.

This is just a simple explanation of the production process of the printed circuit board. Every factory has their different manufacturing process. We still need to work hard to get deeper knowledge of PCB.

Source: http://www.wonderfulpcb.com/blog/basic-knowledge-printed-circuit-board-need-know/

Why should change PCB files into GERBER files and drill data

Most engineers are accustomed to send PCB design file directly to factory for produce, and more popular on the international is converted PCB file to Gerber files and drill data, why should do this.

Because electronic engineers and PCB engineers have different understanding of pcb, the factory conversion PCB may not the same as you want, as you design parameter elements are defined in the PCB file, you do not want these parameters display on the PCB the finished product, you have not stated, PCB factory may product out. This is just one example. If you own convert PCB files to GERBER file can avoid such incidents.

GERBER file is an international standard Gerber format file, which contains the RS-274-D and RS-274-X formats, including RS-274-D format called basic GERBER, need D code to a complete description of a graphic; RS-274-X is called an extended GERBER format, which itself contains D code information. commonly used CAD software can generate two kinds of file formats.

How to check the correctness of the generated GERBER? You only need to import the GERBER files and D code into freeware Viewmate V6.3 , so you can see it on screen.

Drilling data can be generated by a variety of CAD software, the general format is Excellon , it can be displayed in Viewmate. No drilling data certainly can’t make the PCB.

Wonderful PCB(HK) limited  can design and open all kinds of PCB format, if you have any PCB technology questions, welcome to contact with me any time.

More information, please visit www.wonderfulpcb.com

Ball Grid Array Introduction

In the 90s of the last century with the progress of technology, chip integration continues to increase, a sharp increase in the number of I / O pins, power consumption also increases, of integrated circuit packaging requirements are more stringent. In order to meet the development needs, the BGA package began being used in production. Below we can work together to learn about what is exactly BGA.

BGA's full name is ball grid array (ball grid array structure of PCB), is a large component pin package, QFP and four pin similar, are using SMT solder paste welding connected with the circuit board. The distinctness is listed in around the "one dimension" single row type pin, such as gull wing extends a foot, feet horizontally or retracted abdomen bottom J type foot; change into stomach bottom comprehensive array or the local array, for the distribution of two dimensional area of solder ball of the foot, as chip package body on the circuit board solder interconnection tools.

BGA has the advantages of small package area, increase function, increase in pin count, high reliability, good electrical performance, low overall cost.

BGA encapsulation method developed by Motorola Company in 1986, in advance is to BT organic sheet of double-sided board, instead of the traditional metal tripod on the IC package.

At present, BGA can be divided into five categories.

 1. Plastic carrier (BT) P-BGA (with double and multi-layer)
 2. Ceramic carrier plate C-BGA.
 3. TAB package in T-BGA.
 4. Only slightly larger than the original chip of ultra small M-BGA
 5. Other special BGA, such as d-bga's Kyocera (dimpled), m-bga's Olin and V-BGA's prolinx.

Need to make PCB? Inquire here, Wonderful PCB will give you better service.

The price of Circuit Boards From China

When you dealing with China PCB manufacturer, besides its quality, the price of PCB is very important.

According to the different circuit board design, the price will be because of the circuit board material, the layers of the circuit board, circuit board size, the number of each production, the production process and the minimum line width from, the minimum pore size and the number of holes and special process requirements to determine. Within the industry there are several ways to calculate the price.

1, According to the size of the calculation of the price (for small quantities of samples)

Chamber of Commerce of production according to the different circuit board layers, different process given unit price per square centimeter, customers only need to put the size of the circuit board for cm and then multiplied by per square centimeter unit can be drawn to the unit price of the production of circuit board. This method of calculation for common craft of circuit board is very applicable, both for the convenience of producers also convenient for buyers. The following is illustrated as below:

Such as orders for a production factory pricing single panel, FR-4, 10-20 square meters, priced at 0.04 yuan / square cm, then if the purchaser of board size is 10*10cm and production quantity is 1000-2000 blocks, just meets this criteria, the price will be equal to 10*10*0.04=4 yuan a piece.

2, According to the cost of fine calculation price (for mass application)

Because the circuit board of the raw materials are copper clad laminate, production of copper clad laminate factory set some fixed size sold in the market, common have 915mm*1220mm (36 "inches"); 940mm*1245mm 37 ("*49"); 1020mm*1220mm (40 "inches"); 1067mm*1220mm (42 "inches"); 1042mm*1245mm (41 "49"); 1093mm*1245mm 43 ("*49");

Chamber of production according to the production of circuit board material plies, process, quantity and other parameters calculated utilization rate of the circuit board copper clad laminate, in order to calculate the cost of materials, for example production a 100 * 100mm circuit board factory in order to improve the production efficiency, he may will board a chunk of the spell 100*4 and 100*5 to production, which they also need to add some spacing and the plate boundary for convenient production.

The spacing of gongs board plate edge left 2mm, left 8-20mm, large plate and then formed in the raw material size to cut, if not cut just here, what is the use of the excess in the rate maximization. Calculated using just one step, but also a drilling fee, see how many holes. How big is the smallest hole, a large number of holes, but also on board in line to calculate the cost of each small copper plating process costs, plus each company average labor costs, loss rate, profit rate, marketing costs, the total cost divided by a large piece of raw materials can produce the number of platelets, platelet derived unit. The process is very complex, need someone to do, generally quote to more than a few hours.

How can you do Quick Turn PCB service

As the competition is fiercer and fiercer in the world now. The electronic production need a very fast lead time with best price. So quick turn pcb service is appearing in the pcb line. Who can provide good service of the quick turn would grap your customers, especially for the pcb prototypes’ production.

Usually the pcb production for pcb prototyes’ would take 5 days. But sometimes, the customers urgently need the pcb. So they ask for a quick turn pcb production. Someone would ask for 1 days production. So this is a big chanllege to the pcb factory. Just think about it, the pcb production process would be very complicated. Before this, you should make the gerber file into production file.

It would usually take 3-4 hours to deal all the files if there is no any EQ. After that , you have make the films before you make the pcb production. During the production, you should make every pcb process go on well and don’t make any mistake. If you fail, you should remake from the first production process.

So you can see how quick it should be. Actually, 24 hours is usually for simple pcb, one or two layer pcb. If for 4 layer pcb, that would be very tough. It finally depends on your factory’s equitment capacity and the experienced engineers. Of course, if boards are very complicated, we may talk to customers. To make the quick turn pcb lead time for 2-3 days.

As the competition is bigger and bigger, some small pcb factories would try to make quick turn pcb for grabbing new customer. Usually, they need to spend too much resources to the quick turn pcb production. Maybe spending too much material cost on the plan and most of the engineers are focus on the project in the production. But not all the production would be satisfied with the customers.

Flexible circuit board introduction?

For some in the industry of electronic equipment, of soft circuit board for this product must not strange, soft circuit board and ordinary circuit board lighter weight compared. Greater flexibility, are widely used in computer, cameras and other products. Today we are going to talk about flexible circuit board classification and soft circuit board prospects for development.

Flexible circuit board classification

Flexible circuit board usually according to the conductor layers and structure were classified as follows:

1. Single-sided of soft flexible PCB

Single-sided PCB of , only one conductor layer, on the surface can be with or without cover layer. The insulating base material with the products of different applications and different. But usually most insulating materials have polyester, polyimide, PTFE, soft epoxy glass cloth.

2. Double sided soft PCB

Double-sided flexible PCB, there are two layers of conductor, its application and advantages and single soft same main advantage is increased wiring density in unit area hiccup Rong. It can by no metallized hole and, without overburden layer is divided into:

A. non metallic hole, no cover layer;
B. non metal hole, there is a layer of coverage;
C. has a metal hole, no cover;
D. has a metal hole, there is a layer of coverage.
No coverage of the two sides of the soft PCB application is less.

3. Multi layer soft PCB

Flexible multilayer PCB with multi-layer laminating technology, can be also made into a multilayer. The simplest of multilayer flexible PCB is on the basis of single both sides covered with copper shielding layer formed three layer of soft pcb. this three layer of soft PCB in the electrical characteristics is in coaxial conductor or shield conductor. The most commonly used multi-layer soft PCB structure is four layer structure, with metallized holes to realize the interconnection between layers, the middle layer 2 is generally power layer and ground layer.

The advantages of multilayer soft PCB substrate film, light weight and excellent electrical characteristics, such as low dielectric constant. With polyimide film as the raw materials to made of multilayer flexible printed circuit board (PCB), than the weight of the rigid epoxy glass cloth Multilayer PCB board about one-third lighter, but it is losing the single-sided, double-sided flexible PCB excellent can be flexible, most of these products is does not require flexible.