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Have you noticed that now more and more of our lighting is using led lighting.What is LED? Compared to the traditional light bulbs, LEDs have lower power consumption, longer lifetime and higher energy efficiency. In the PCB industry,when we say LED PCB, it refers to the pcb used for LED lighting, if you are looking for a suitable LED PCB for your lighting system, this article may bring you something. WHAT ARE LEDS COMPOSED OF?LED is an initial light-emitting diode that produces light when an electric current passes through. LEDs typically have negative and positive electrodes, which generate light in the visible light region.The LEDS are glued to the PCB by soldering process and have electrical connections for lighting.Since light-emitting diodes dissipate a lot of heat when they are in use, when you are designing LED, the metal core is usually the best choice for LED PCB, it is because that it dissipates heat more faster. Among them, the metal material aluminum is the most widely used
High -speed PCB design rules are usually divided into two types: physical rules and electrical rules. The so -called physical rules refer to some design rules based on physical dimensions. For example, the line width is 4mi1, the distance between the line is 4mi1, and the length of the parallel wiring is 4mi1. The electrical rule refers to the design rules related to electrical characteristics or electrical performance, such as wiring delay control between INS and 2NS, and the total amount of stringing on a certain PCB line is less than 70mV. Define the physical rules and electrical rules to further explore high -speed wiring. High -speed wirms based on physical rules (physical rules) include AutoActive RENers, CCT wiring, B1AZEROUTER wiring, and Router Editor wiring. In fact, these wiringers are automatic wiring drivers of physical rules, which is It is said that these roders can only automatically meet the requirements of the physical dimensions specified by the design engineer,
Digital systems have strict requirements for timing. In order to meet the requirements of the signal timing, adjustment of the signal wiring on the PCB has become part of the PCB design work. Adjusting the wiring length includes two aspects: relative and absolute. The so -called relative is that the length of the wiring is consistent, and ensure that the signal is synchronized to several receivers. Sometimes there is correlation between a set of signal lines on PCB. For example, the bus needs to be corrected, because the signal needs to be synchronized at the receiving end. Its adjustment method is to find out the longest wiring, and then adjust other wiring to the equal length. The absolute requirement is to control the delay of the wiring between the two devices to a certain value, such as the delay between the device A and B as the ins, and this requirement is often proposed by the high -speed circuit designer, and the PCB engineer will realize it. Essence To meet this require
PCB multi -layer board refers to the multi -layer line board used in electrical products. The multi -layer board uses more single -panel or double panel wiring board. Use one double -sided as the inner layer, two -sided single -sided as the outer layer or two double -sides as the inner layer, two -sided single -sided outer layer printing line board, alternate the positioning system and insulating bonding material, and the electrophoretic graphics The interconnected printing circuit boards are made according to design requirements. With the continuous development of SMT (surface installation technology) and the continuous launch of the new generation of SMD (surface installation device), such as QFP, QFN, CSP, BGA (especially MBGA), make electronic products more intelligent and miniaturized, so Promote major reforms and progress of PCB industry technology. Since IBM first successfully developed high -density and multi -layer boards (SLC) in 1991, major groups from various countries
Since the mid -1980s in the mid -1980s, its output value and production have increased at a rate of more than 10 % (compared with the previous year). Because the components develop rapidly to `light, thin, short, small" " Multi -layer boards will be the most influential and vitality door category in the printing circuit board industry, and become the leading product. The multi -layer plate structure will move towards diversified and thin -level high -level, while the M C m one L structure will be faster faster. Development. Multi -layer board requires high device and technology investment. In the future, high -level multi -layer boards will be concentrated in strong PC B large manufacturers to develop and produce High density Thin, high (high) layered Diversity of multi -layer plate structures The thin substrate of the high -performance thin copper box High flatness and surface coating technology of the board surface Dead multi -layer board and rigidity multi -layer board
Any printing board has the problem of assembly with other structural parts. Therefore, the shape and size of the printed board must be based on the structure of the product [5]. However, from the perspective of production technology, it should be as simple as possible. Generally, it is a rectangular shape that is not very different in length and width to facilitate assembly, improve production efficiency, and reduce labor costs. In terms of number of layers, it must be determined according to the requirements of the circuit performance, the size of the board, and the density of the circuit. For multi -layer printing boards, the application of four -layer board and six -layer board is the most widely used. Taking four layers of boards as an example, the two wire layers (component surface and welding surface), a power layer, and a formation. Each layer of the multi -layer board should be symmetrical, and it is best to count the bronze layer, that is, four, six, and eight layers. Be
1. The MeChanical mechanical layer, as its name implies, is used for mechanical molding, that is, the appearance of the entire PCB. In fact, when we talk about the mechanical layer, we refer to the appearance structure of the entire PCB circuit board. It can also be used to set up the shape size, data mark, alignment mark, assembly description and other mechanical information of the circuit board. The information changes according to the requirements of the design company or PCB manufacturer. In addition, the Mechanical layer can be connected to other layers to output together. 2. Keep Out Layer (forbidden wiring layer), which is used to define components and wiring areas that can be effectively placed on the circuit board. Draw a closed area as an effective area for wiring. It cannot be automatically deployed and wiring outside this area. When we lay a copper with electrical characteristics, the wiring layer is prohibited from defining the boundary, that is, after we first define
When pressing, PP and copper foil are added on both sides of the double panel, and the high temperature and high pressure are pressed into a multi -layer board. In short, the four -layer board has an inner layer. In terms of process, some circuits will be carved and suppressed in the inner layer. Double -panels can directly cut out the drilling of the factory board. The four -layer board refers to the printing circuit board. PCB is made of four -layer glass fiber, which can reduce the cost of PCB, but the efficiency is very low. Although it is difficult to get the four -layer PCB board by observing the cross section of PCB, few people have such vision. However, you can identify the four -layer board by observing the guide hole. If the same guide hole, or the motherboard or the graphics card can be found on both sides of the PCB, if the position of the guide hole cannot be transmitted, it is a four -layer board. The four -layer circuit board is made of combination on the basis of
processing method: The processing process of PCB factory similar to epoxy resin/glass woven fabric (FR4), but the board is relatively crispy and easy to break the board. Drilling and gong knife life should be reduced by 20%during drilling and gongs. 2. PTFE (polytetrafluoroethylene) material processing method: 1. Open ingredients: The protective film must be kept to prevent scratching and indentation 2. Drilling: 2.1 Use a new drilling (standard 130), the best one by one, the pressure of the feet is 40PSI 2.2 Aluminum sheet is a cover, and then use a 1mm mighty pad to step up the PTFE board 2.3 After drilling, use a wind gun to blow out the dust in the hole 2.4 Use the most stable drill, drilling parameters (basically the smaller the hole, the fast drill speed, the smaller the chip load, the smaller the return speed) 3. Pole treatment 3. Pole treatment Plasma treatment or sodium cricket activation treatment is conducive to hole metalization 4. Pth Shen copper 4.1 Afte
1. The odd number layer PCB needs to add non -standard layer of core layer bonding process on the basis of the core structure process. Compared with nuclear structures, the production efficiency of the PCB circuit board processing plant with foils outside the nuclear structure will be reduced. Before layer pressing, the outer core needs additional process processing, which will increase the risk of scratching and etching errors. 2. A balanced structure Avoid bending. The best reason for the design without a strange layer of PCB is that the strange layer of the circuit board is easy to bend. After the multi -layer circuit key combination process is completed, when the PCB is cooled, different layer of pressure tension will cause PCB to bend when the core structure and foil structure cool. As the thickness of the circuit board increases, the risk of curvage of two different structures of composite PCB is greater. The key to eliminating circuit boards is to use balanced layers. Altho
1 layer pressure The layer pressure parameters may be different because the plates of different companies may be different. Take the Shengyi substrate and PP as a multi-layer board mentioned above, in order to ensure the full flow of the resin, make the combination of good combination, and require lower the heating rate (1.0-1.5 ° C / min) and multi-paragraph The pressure is coordinated, and the time is required for a long time during the high temperature stage, and 180 ° C is maintained for more than 50 minutes. Here are the recommended sets of boarding program settings and the actual heating of the plate. The binding force of the pressed plate to detect its copper foil and the substrate is 1.ON / MM. The plates after the picture have no layering and bubbles after six thermal shocks. 2 drilling processing Drilling conditions are an important parameter that directly affects the quality of the hole wall of PCB during processing. Because the halogen -free copper plate is used to i
In terms of the principle of halogen -free base boards, most of the halogen -free materials are mainly phosphorus and phosphorus nitrogen. When the phosphorus resin is burned, it is heated to generate polymer phosphoric acid, which is extremely dehydrated. The surface of the high -molecular resin forms a charcoal film. The resin combustion surface contacts the air to extinguish the fire and achieve the flame retardant effect. Polymer resin containing phosphorus nitride compounds produce non -combustible gases during combustion to help the resin system flame retardant. The halogen-free substrate materials are based on the JPCA-ES-01-2003 standard: the copper-covering plate with a chlorine (C1) and bromine (br) content of less than 0.09 % WT, respectively, is defined as a halogen-free copper plate. (At the same time, the total amount of CI+BR ≤0.15 % [1500ppm]). Why do halogen refers to the halogen elements in the chemical element cycle table, including fluoride (F), chlorine (CL),
1. Line and Pattern (Pattern): The line is a tool for turning between the original. In the design, the design will be designed as a large copper surface as the ground and power layer. The lines and the diagram are made at the same time. 2. Throughhole/VIA: The guide holes can turn the lines above two levels of lines, and the larger guide holes are used as parts plug -in. Putting and positioning, fixed screws during assembly. Industrial control circuit board 3. SolderResistantant/SolderMask: Not all copper noodles have to eat tin parts, so it will printed a layer of substances from copper noodles (usually epoxy resin) to avoid Non -short circuit between the lines of tin. According to different processes, it is divided into green oil, red oil, and blue oil. 4. Dielectric: It is used to maintain the insulation between lines and layers, commonly known as substrate. 5. Legend/Marking/Silkscreen: This is a non -necessary composition. The main function is to mark the names and positi
With the continuous expansion of the company's scale, the original company's website has been far from enough...HDI (High Density Interconnect Board) is a compact circuit board designed specifically for small capacity users. Compared to ordinary PCBs, the most significant feature of HDI is its high wiring density, which is mainly reflected in the following four aspects.1、HDI is smaller and lighterThe HDI board is made of the traditional double-sided board as the core board through continuous lamination. This kind of circuit board made by continuous layering is also called build-up multilayer board (Build-up Multilayer, BUM). Compared with traditional circuit boards, HDI circuit boards have the advantages of "light, thin, short, and small".The electrical interconnection between HDI board layers is realized through conductive through holes, buried holes and blind holes. Its structure is different from ordinary multilayer circuit boards. A large number of micro-buried blind holes
You may always hear about core and prepreg in PCB production. The material is composed of copper foil, reinforcement, resin matrix, and filler system. And each part plays a key role.The appropriate materials have a good quality assurance for the products that produced, but it's not that the more expensive the material is, the more suitable it is for your products.Please kindly contact us KnownPCB, we can provide a variety of material for your better choice.
PCB can be called printed circuit board. It is an important electronic component, also a carrier of electronic component, and a provider of electrical connections.Printed Circuit boards are the most active industry in the contemporary electronic component industry, and all electronic products require the use of printed circuit boards. At the same time, they are also used in some electrical products.Advantages of PCBs: minimize and visualize the circuit, it plays an important role in mass production of fixed circuits and optimization of electrical layout.classification of PCBs: 1.By layer：Single sided board, Double sided board and Multilayer board.2.By characteristic: Flex pcb，Rigid pcb , Flex&Rigid pcb.3.By different types of resin：Epoxy resin, Polyester resin, PI resin (polyimide).4.By flame retardant properties : Flame retardant (UL94-VO, UL94-V1), Non-flame retardant (UL94-HB level).Our commonly used materials :SY：S1141/S1000/S1000-2/S1150G/S1170G/S1600L/SH260...KB：KB6160/KB6165/KB6
Recently we have produced a new semiconductor board,we would like to share some pictures of our new product as below: The character of this new product as below:1.12 layers with heavy copper 4oz for all layers; 2.The board thickness is 6.35mm; 3.The finishing is ENIG(Au:2u”) + Selectivity hard gold plating (Au:50u”); 4.This board with countersunk and blind routing design; 5.With Via-in-pad design, 6.The aspect ratio is 16:1
We,KnownPCB will attend Global Sourcing Electronics Exhibition in AsiaWorld-Expo,HongKong on Apr.11-14,2023.We sincerely invite you to visit our Booth 11Q14 in HK then.We care what you care, welcome to visit us and discuss more business cooperation. We're waiting for you in the booth. You can also contact our sales representative if anything needs to assist then. Thank you for your attention.
Have you noticed that now more and more of our lighting is using led lighting.What is LED? Compared to the traditional light bulbs, LEDs have lower power consumption, longer lifetime and higher energy efficiency. In the PCB industry,when we say LED PCB, it refers to the pcb used for LED lighting, if you are looking for a suitable LED PCB for your lighting system, this article may bring you something. WHAT ARE LEDS COMPOSED OF?LED is an initial light-emitting diode that produces light when an electric current passes through. LEDs typically have negative and positive electrodes, which generate light in the visible light region.The LEDS are glued to the PCB by soldering process and have electrical connections for lighting.Since light-emitting diodes dissipate a lot of heat when they are in use, when you are designing LED, the metal core is usually the best choice for LED PCB, it is because that it dissipates heat more faster. Among them, the metal material aluminum is the most widely used
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