Multilayer PCB design method (M)

The above is the general principles of the PCB layout and wiring, but in practice, the layout of the components and wiring is still a very flexible work, the layout and the connections of the components is not the only way, the result of the layout to a large extent depends on the designer's experience and thoughts. In a manner of speaking, there is no a standard to judge the layout and wiring scheme of right and wrong, and can only compare relatively better. So the above layout and wiring principle as a design reference only, the practice is the only standard of judgment.
11.2.3 The special requirements of multilayer PCB layout and wiring
Compared with the simple single plate and double board, multilayer PCB layout and wiring has its unique requirements. For multilayer PCB layout, sum up is to arrange the different power supply and the layout of the types of components. Its purpose is to bring electricity in the back of the segmentation is convenient, but also can effectively improve the anti-interference ability of between components.
The so-called reasonable arrangement of the power supply and to the layout of the type of components, is to use the same power level and the same type of components together as far as possible. For example, when a + on circuit principle diagram, + 5 V, 3.3 V? 5 v, + 15 v,? 15 v, voltage grade, the designer should use the same voltage grade of components placed centrally in the circuit board of a certain area.


Ms Grace Zhang
________________________________
Oversea sales
Wonderful PCB
A Floor 6, Nanyuan Fengye Mansion, Nanshan Avenue, Nanshan District, Shenzhen City 518054, China

T +86-755-86229518-809 | F  +86 755 2607 3529|  e  wonderful16@wonderfulpcb.com |
w  www.wonderfulpcb.com  | Skype:wonderful16 | MSN: wonderful16@hotmail.com

PCB Industry

At present, Chinese production of electronic circuits, and printed circuit industry sales accounted for 44 percent of the global total; China printed circuit board equipment, raw materials, sales and production also remain the world's first. Despite the good momentum of development, many exhibitors participating CPCASHOW has said that due to the recent influx of a large number of PCB industry areas, capacity expansion is serious, resulting in a vicious competition intensified. In addition, the continued growth of smart terminals and emerging markets, driven by significantly increasing the demand for HDI, FPC, etc., but also stimulate the industry investment to expand plant expansion, further intensified price competition.

I found that many domestic exhibitors showcasing high-order HDI, IC, buried blind PCB, FPC, high-end products, such as multi-layer FPC, PCB manufacturer have indicated that many domestic with international advanced manufacturing PCB comparable.

Production capacity expansion, high degree of product homogeneity, leading PCB price pressures. Price war intensified, most industry struggling to cope.

How to deal with a price war? I found a positive innovation in the field show exhibitors are booming popularity. Visible on the product technology upgrades, technological innovation will help blaze a new trail in the price war. In addition, to improve product competitiveness, increase product functionality and value, so that enterprises break free from the mire of product homogeneity, but also to important initiatives.

When it is time for finding a manufacturer, consider manufacturers in Shenzhen, China. They have done offering these kinds of services professionally for years. You want some good companies to be recommended? WONDERFUL PCB LIMITED is not a bad choice.

If you need expert PCB assembly service, feel free to contact wonderful02@wonderfulpcb.com.

Image forming/wire production

Made the first step is to create online wiring between components. We use the negative transfer (Subtractive transfer) mode will work film performance on the metal conductor. This technique is the entire surface is covered with a thin layer of copper foil, and put the spare part to eliminate. Additional type transfer (i.e. the Pattern transfer) is another less people use way, it is only where the need to apply the method of copper wire, but we are not here to talk about.
If is made of double panel, will be spread on both sides of the PCB substrate, copper foil, if the production is a multilayer, the next step will be to the board to stick together.

Positive photo resist, photo resist) is made of sensitizer, it will dissolve under illumination (negative photo resist is if without lighting will decomposition).There are many ways to deal with the photo resist on the surface of the copper, but the most common way, it is heated, and contains the photo resist on the surface of the rolling (called dry film photo resist).It can also use liquid spray at the top, but dry film type provides high resolution, can also create more fine wires.

Hood is just a manufacturing PCB layer in the template. On the PCB board before the photo resist through UV light exposure, hood can prevent part of the cover in the above areas of the photo resist exposure not (assuming that USES the positive photo resist).These are covered with the photo resist, would be "wiring".

After the photo resist is developed, to etch the other bare copper parts. Board can be dipped into the etching solvent etching process, or spray the solvent on the board. Commonly used as a solvent etching, Ferric Chloride, Ferric Chloride), Alkaline Ammonia (Alkaline Ammonia), Sulfuric Acid and Hydrogen Peroxide, Sulfuric Acid + Hydrogen Peroxide), and copper Chloride (Cupric Chloride) by oxidation reaction such as its oxidation (such as Cu fecl2 fecl3 = CuCl2 + 2 + 2).After the etching will be to get rid of the rest of the photoresist.This is called to take off the membrane (Stripping) program.

Printed Circuit Board Words

1、印制电路：printed circuit
2、印制线路：printed wiring
3、印制板：printed board
4、印制板电路：printed circuit boards (PCB)
5、印制线路板：printed wiring board(PWB)
6、印制元件：printed component
7、印制接点：printed contact
8、印制板装配：printed board assembly
9、板：board
10、单面印制板：single-sided printed board(SSB)
11、双面印制板：double-sided printed board(DSB)
12、多层印制板：mulitlayer printed board(MLB)
13、多层印制电路板：mulitlayer printed circuit board
14、多层印制线路板：mulitlayer prited wiring board
15、刚性印制板：rigid printed board
16、刚性单面印制板：rigid single-sided printed borad
17、刚性双面印制板：rigid double-sided printed borad
18、刚性多层印制板：rigid multilayer printed board
19、挠性多层印制板：flexible multilayer printed board
20、挠性印制板：flexible printed board
21、挠性单面印制板：flexible single-sided printed board
22、挠性双面印制板：flexible double-sided printed board
23、挠性印制电路：flexible printed circuit (FPC)
24、挠性印制线路：flexible printed wiring
25、刚性印制板：flex-rigid printed board, rigid-flex printed board
26、刚性双面印制板：flex-rigid double-sided printed board, rigid-flex double-sided printed
27、刚性多层印制板：flex-rigid multilayer printed board, rigid-flex multilayer printed board
28、齐平印制板：flush printed board
29、金属芯印制板：metal core printed board
30、金属基印制板：metal base printed board
31、多重布线印制板：mulit-wiring printed board
32、陶瓷印制板：ceramic substrate printed board
33、导电胶印制板：electroconductive paste printed board
34、模塑电路板：molded circuit board
35、模压印制板：stamped printed wiring board
36、顺序层压多层印制板：sequentially-laminated mulitlayer
37、散线印制板：discrete wiring board
38、微线印制板：micro wire board
39、积层印制板：buile-up printed board
40、积层多层印制板：build-up mulitlayer printed board (BUM)
41、积层挠印制板：build-up flexible printed board
42、表面层合电路板：surface laminar circuit (SLC)
43、埋入凸块连印制板：B2it printed board
44、多层膜基板：multi-layered film substrate(MFS)
45、层间全内导通多层印制板：ALIVH multilayer printed board
46、载芯片板：chip on board (COB)
47、埋电阻板：buried resistance board
48、母板：mother board
49、子板：daughter board
50、背板：backplane
51、裸板：bare board

Sophie Deng
_______________________________________
Wonderful PCB Limited
NO.32A,Building NO.1, XianDaiC hengHuaTing,ChuangYeRoad|NanShan District,ShenZhen City 518054|  China  T +86-755-86229518-806 | F  +86 755 2607 3529|  e  wonderful08@wonderfulpcb.com |
w  www.wonderfulpcb.com  | Skype:wonderful-07   |                                                   
Welcome to our trading shows:
1.Booth: L32,Expo Electronic 2013,Apr.10-12th in CROCUS EXPO,Moscow,Russia
2.Booth: 11J36, HK Global sources  Apr.12-15th, 2013 Asia World-Expo, Hong Kong
3.Booth: 9J35, HK Global sources Oct.12-15th,2013 Asia World-Expo, Hong Kong
4.Booth: 70206, CES  2014  Jan,8th-11th in Las Vegas, USA

Component placement

Cloth of PCB board in the process, the system layout is completed, to review PCB figure, look at the layout of the system is reasonable, whether can achieve the optimal effect. Usually can be examined from the following several aspects:
1. The system whether guarantee reasonable wiring or optimal layout, wiring whether can guarantee the reliable and can ensure the reliable of circuit. When the layout of the need of the signal and the direction of the power and ground network have a whole understanding and planning.
2. The PCB size is consistent with the processing drawing size, can meet the requirements of PCB manufacturing process, any behavior. Don’t pay attention to this need, a lot of PCB circuit layout and wiring design beautifully, reasonable, but neglect the precise localization of locating connectors, lead to can't and other circuit docking design.
3. Components in 2 d and 3 d space without conflict. Pay attention to the actual size devices, especially the height of the device. Yuan device, layout of the welding from altitude generally no more than 3 mm.
4. The component layout density and orderly, neat rows, whether all the cloth. When components layout, not only to consider the direction of the signal and the signal types, need to pay attention to the places or protect, also want to consider the overall density of the device layout, density uniformity.
5. Often need to change the components can be easily replaced, whether it's a good card inserted into the device. Often should guarantee the change of components of the replacement and plug is convenient and reliable.
6. Pay special attention to when the layout of the radio frequency part, should avoid to radio frequency interference of other components, so must be isolated.

PCB Prototype Assembly Creates Unique Boards

PCBs are important part of all electronic equipment that is used these days. The layout and design of a PCB is crucial for the entire product. This key element or components can define product’s success as well as failure, because this is what the product performance is dependent on. In the meantime, if pcb assembly make any mistakes such as wrong assembly, absent assembly etc, will occur big problem in product’s function!

Most (although not all) of firms only provide manufacturing services, so it's entirely on you to provide specifications for a quality device and to hope they are able to deliver it. If the specs were flawed, or if counterfeit parts sabotage it, there will be little you can do about it. Wonderful PCB Technology Co., Ltd is PCB manufacturer and has PCB assembly line in house, which provide you whole services of PCB! Wonderful PCB provide high quality PCB assembly prototype, which can often save you a lot further down the road.

The Benefits of PCB Prototype Assembly

Think of it as an insurance policy: If you spend a bit more money up-front, you'll save yourself a lot of hassle later on. After all, these days, you can't risk your company's reputation on dodgy electronics. Once a firm becomes known for poor products, it can be extremely hard to undo the damage without a full (and costly) rebranding effort.

With PCB prototype assembly services, you get the breathing room you need to thoroughly test your design before committing to a production run.

As an experienced electronics manufacturing Service Company, Wonderful PCB can often begin by improving your design right from the start. Many initial designs are overly-complex, or fail to take advantage of the latest manufacturing technologies on offer. Allowing the manufacturer to look over your design and suggest changes can very often result in simplified designs that reduce component use, making them both cheaper and more reliable.

PCB Prototype Assembly Builds Better Boards

Simply put, prototyping services help you create a better product. You'll be able to put items on shelves which are less expensive, more reliable, safer, and more compliant with health and environmental regulations.

Given that your reputation really is all you have on the Internet, why gamble with untested products? Put a little more money into prototyping, and you'll reap the benefits throughout your products' entire life cycle.

Lead Time of PCB Assembly

Before a new electronic product can get accepted on the market, there are many things need to do. First of all, you should have a new correct design. How to know whether your design is correct and perfect without any problem? Be careful on the below steps, you’re probably going to need them in the near future.

To verify your PCB design, engineers usually will find some companies to make some PCB prototypes. For example, if you PCB is a double-sided PCB, it will spend about 5-7 days for a real PCB manufacturer. But you just get a bare PCB, without any components on it. So how could it verify the design? The answer is not. It can’t check the problems in your design. You need to have a complete board with all necessary parts on it.

You may think, offer you the bill of materials, the manufacturer can buy them for you. Yes, it usually works if they do have a professional purchase department. If not, you are going to buy all the components by yourself. It sounds crazy trouble. Yes it is. So usually the designer wants PCB and components assembly. It takes long time to have all the components, because some integrated circuits will need import from overseas. It does need a lot of time, usually 3 weeks. So the lead time of PCB assembly will be probably the lead time of all components? Nope, you should never forget the time for assembly. It won’t last one week if the BOM list it not so complicated.

Now you’ll know the whole lead time for PCB assembly. It really depends on the components source of your purchase department. They fast, lead time short. Otherwise, they slow, lead time long.

So if you are considering making a PCB prototype and assembly, think about the lead time. Prepare enough time in your time schedule for it, figure out a testing method for it when you have it. Most important thing is that it may need several times for prototyping. You will find problems in your design from each prototype. It takes money. Now go getting all the potential costs approved by your accounts in advance.

When it is time for finding a manufacturer, consider manufacturers in Shenzhen, China. They have done offering these kinds of services professionally for years. You want some good companies to be recommended? WONDERFUL PCB LIMITED is not a bad choice.

If you need expert PCB assembly service, feel free to contact wonderful02@wonderfulpcb.com.

What is a blind hole?

A blind hole is a hole that does not completely penetrate a material, such as wood or plastic, stopping short of the opposite side. These holes are used for a wide variety of components and serve a number of functions. Most simply, the blind hole design is useful for concealing fasteners and creating a smooth, even surface that is visually appealing. Equipment designed to create blind holes can be used to manufacture them and people can also drill, ream, or use other tools to create them, using careful control to avoid punching through to the other side.

One place the blind hole is commonly seen is in woodworking. People often want to conceal fasteners like pegs and anchor screws because they are not attractive to look at. In addition, exposed fasteners can create a snag point for fabric and other materials in addition to collecting dirt and dust. The blind hole allows people to hide a fastener in the assembly of a product like a desk or table. Using this construction technique tends to add to costs, but will result in a more aesthetically pleasing final product.

For certain types of equipment, blind holes are needed to keep the surface of the equipment even. Medical equipment, for instance, needs to be easy to sterilize. Points like the heads of screws and bolts can be hard to clean thoroughly and may create a collection point for bacteria and other unwanted organisms, allowing the equipment to transfer infectious materials between patients. Blind holes eliminate this safety risk.

Blind holes can vary in depth and width depending on how they are created. A blind hole may be lined with materials like sheathing for bolts and other fasteners and can also be used with glue and pegs or other components. When designing objects built with concealed fastenings, people must consider the load on those fasteners and develop appropriate measures for helping them resist pulling and tearing. This may include reinforcing holes and using special glues.

When people need to take apart something made with blind holes for repair or maintenance, it can be challenging, as it is difficult to find the fastenings and not being able to see them, people cannot see what they are doing when they take apart the object. In some cases, it may not be possible to pull the object apart, and in others, people should follow provided directions, if they are available, very carefully to limit the chances of damaging the item while taking it apart. If no directions can be found, people should look for sheathing or cladding that may be removable, providing access to fasteners and other components.

Contact wonderful02@wonderfulpcb.com if you have any inquiry about PCB.

PCB Assembly services

Bigger doesn't always mean better - especially in the world of technology. As the digital revolution continues to expand our capabilities, electronic devices continue to shrink into smaller, more compact units. Because of this, electronics companies must take advantage of advancements in manufacturing technologies like PCB assembling.
But although the idea of building your electronics design concepts in-house may sound good in theory, it's not always practical. This is why it's smart for businesses to consider outsourcing their PCB assembling processes to a qualified manufacturer. Not sure if this is the right solution for you? Here are 6 times when you need use PCB assembling and how a contract manufacturing company can help.
1. You require precision. In order to deliver a quality product to your customers, your electronic devices must be assembled with precision, uniformity, and accuracy. On top of this, your product must be compact enough to compete with other electronics. PCB assembling makes it easier to design a small unit, but when it comes to crafting a very small device, it can be difficult to get it "just right". Many contract manufacturers work with robotic technologies in order to develop your products with precision every time.
2. You need to save time. PCB assemblage is a fast way to turn around prototypes and finished products, but obtaining the parts to build the device can be a bit more time-consuming. If you're too busy to select high quality materials, you could end up with a product that is not up to par. A professional manufacturing service will take care of this for you - just be sure that you check out their reputation and ensure that they don't use counterfeit parts.
3. You're feeling "stuck". Creating the schematics for product that uses a PC board assembly requires a lot of careful planning. Even the most skillful designers may find themselves feeling stuck or blocked, and unsure of their layout. A good contract manufacturing company will be able to look over your original design and give you some new insights and perspective in order to ensure that the final product will be of the highest quality.
4. You need a second opinion. Even if you're not stuck in the design process, it's always smart to have a second pair of eyes to review your plans before jumping into the PCB assembling process. Electronics manufacturing companies have the experience and know-how to help you detect any flaws in your design or to offer tips on how to improve the schematic.
5. Business is booming. When you first started out and things were slow, it wasn't a big deal to use older technologies and manufacture your products in-house. Now that your business is getting noticed, however, it's time to make a change. PCB assembling will help to keep you ahead of the technological curve and provide your consumer base with the products that they desire. Unfortunately, working with small parts at a high volume can be a burden. Because of this, it's wise to hire a contract manufacturer. These companies will be able to get the job done quickly and accurately so that you never run out of stock.
6. You want to lower costs. The good news is that PCB assembling is cheaper than old manufacturing methods. The bad news is that trying to produce electronic devices within your facility can quickly become costly. Not only are you required to pay an expansive work force to put your products together, test them, and make corrections, but you also have to pay for all of the manufacturing equipment and robotic technologies that may be required. Why not let a contract manufacturer shoulder these burdens so that you can focus on selling your electronics and coming up with new and innovative ideas? The right manufacturing services will enable you to enjoy the benefits of cheaper production without sacrificing quality.