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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
During the long-term production control process, we found that the aperture reached 0.15-0.3mm, and the proportion of the plug holes increased by 30%. 1. The problem of plug holes in the process of hole formation: During the printed board processing, most of the small holes of 0.15-0.3mm still use the mechanical drilling process. In long -term inspection, when we found drilling, we left in the pores The following are the main reasons for drilling holes: When the holes appear in small holes, due to the small pore diameter, high -pressure water washing and chemical cleaning before sinking copper were difficult to remove the debris in the small holes. Essence When drilling the thickness of the stacked layer, the suitable drilling mouth and pad are used to keep the substrate clean. The pads are not reused. The effective vacuum effect (using an independent vacuum control system) is a factor that solves the plug hole.
The drill head is first poured on the copper plate, and then passes through the chemical sinking copper, and the electroplating copper forms a coating hole. The two plays a vital role in the metal of holes. 1. Chemical sinking bronze machine: In the process of double -sided and multi -layer printed board manufacturing, it is necessary to metallize non -conductive nude holes, that is, chemical sinking copper to make it a conductor. Chemical sinking solution is a catalytic "oxidation/restoration" reaction system. Under the catalysis of metal particles such as AG, PB, AU, CU, copper is deposited. 2. Copper plating mechanism: The electroplating definition is to use the power supply to push the coating on the surface of the cathode on the surface of the cathode in the solution. Copper plating is a "oxidation/restoration" reaction. The copper metal anode in the solution oxidize the copper metal on its surface and become copper ions. On the other hand, a reaction is generated on the c
For high -tech development, people need high performance, small volume, and many functions, which prompts the manufacturing of the line board to manufacture to light, thin, short, small development, limited space, and more functions. The wiring density becomes larger. Small. From 1995 to 2007, the minimum pores of mechanical drilling batch capacity fell from 0.4mm to 0.2mm or even smaller. Metal -tonged pores are getting smaller and smaller. The metallic holes depended on the inter -layer interconnection are directly related to the reliability of the printing board. With the narrowing of the aperture, there are no miscellaneous objects that have no effect on the large pores, such as grinding brushing debris and volcanic ash. Once they remain in small holes, chemical sinking copper and electroplating copper will lose their effects. Metal -oriented fatal killer. The design of the printed circuit board is based on the circuit schematic diagram to realize the function required by the
Plug -in wiring terminal The product has a needle distance of 3.5, 3.81, 5.0, 5.08, 7.5, 7.62, and 2-24. It can provide a fixed socket with screws to match and seismic connection. The plug uses the side connection technology, that is, the screw direction is perpendicular to the direction of the wire. Screw -type wiring terminal The line board wiring terminal has always occupied a very important seat in the electronics industry, and it has now become an important part of the printing line board. Its structure and design are more solid to the characteristics of screw connection that are convenient and reliable in wiring; the structure is compact, the link is reliable, and has its own advantages; the principle of lifts of the clamping body is used to ensure that the wiring is reliable and large; The body is divided into two parts to ensure that the distance when the screw is tightened will not be passed to the solder joint and damaged the welding joint; Spring -type wiring termina
The PCB board electrical connection is the most widely used in PCB wiring terminals. How to set the height and its corresponding role in designing is. The size of the key management and control of the terminal is mainly bent terminals 1. Card point size (directly affects PIN maintenance)2. The height of the shift (directly affects the GAP value of the finished product) 3. The height of the stab (only to increase PIN maintenance, some products need) The other three aspects can be controlled 1. The chief of the terminal 2. The width of thepin feet 3. Straight lines of terminals Strengthen the control of production processes to ensure the efficient manufacturing system to ensure the quality and intersection of the product.
Flexible Printed Circuit Board (abbreviated FPC) is also known as flexible printed circuit board, or soft printed circuit board. According to the definition of IPC, the deflection of the circuit board is a product that is designed and produced by the line graphics on the deflection substrate in a printed method. (1) FPC is small and light weight. (2) FPC can move, bend, and twist. (3) FPC has excellent electrical performance, dielectric performance and heat resistance. (4) FPC has higher assembly reliability and assembly operationability. (5) FPC can be installed with three -bit connection. (6) FPC is good for heat diffusion. (7) Low cost. (8) The continuity of processing.
Number of layers of the line: single -sided FPC, double -sided FPC, multi -layer FPC Physical strength: deflection PCB, just -scratch PCB According to the substrate: polyester substrate type, organic fiber substrate type, polytexoethylene medium thin film substrate type, etc. By an enhanced layer: there is an enhanced FPC, no enhanced FPC Round density: ordinary FPC, high -density interconnection (HDI) FPC The soft plate is a printing circuit made of flexible insulating substrate, and has the advantages of many hard print circuit boards. The product volume is small, light weight, and the volume of the device is greatly reduced. The application of electronic products to high density, miniaturization, lightweight, thin, and high -reliable direction needs. , Folding, you can make a three -dimensional wiring, arbitrarily arrange according to the requirements of the spatial layout, change the shape, and move and retract in the three -dimensional space to achieve the integration of
The insulation film forms the basic layer of the circuit, and the adhesive bonded the copper foil to the insulating layer. In multi -layer design, it is bonded with the inner layer. They are also used as protective coverage to separate circuits from dust and humidity, and can reduce the stress during the deflection, and copper foil forms a conductive layer. In some flexible circuits, rigid components formed by aluminum or stainless steel are used. They can provide the stability of the size, providing physical support for the resettlement of components and wires, and release of stress. Adhesives bond the rigid components and flexible circuits together. In addition, there is also a material that is sometimes used in a flexible circuit. It is a bonding layer. It is formed formed by coating on both sides of the insulating film. The bonding layer provides environmental protection and electronic insulation functions, and can eliminate a layer of film, as well as multi -layer capabilitie
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