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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
Firstly, during the production and processing of PCB boards, there will be a certain proportion of defective products. At this point, we need to use mechanical equipment to inspect and screen out unqualified defective products. Therefore, we need to conduct electrical testing. So, what is the difference between testing and flying needle testing? The testing is divided into test fixture testing and flying needle testing, In terms of speed, the test frame test will be faster, and the flying needle test will be slower In terms of cost, the cost of testing racks is higher As for which testing method to choose, we need to choose based on the number of PCBs. For those with a large number, choose a testing rack, and for those with a small number, choose flying pins Based on cost, time efficiency, and comprehensive evaluation and selection
In the automotive market, new energy vehicles have become a rising star, and every car company has launched their own new energy vehicles, which is enough to show that new energy vehicles are the trend and will inevitably enter thousands of households. However, every development process is always full of uncertainty, and there are always new problems waiting to be solved. Whether the subsidy policy for new energy is reasonable, how new energy can smoothly enter the market, and how to avoid new energy safety accidents... In the process of exploring and advancing, new energy vehicles have faced a series of problems thrown by the market. Now, the editor of the circuit board has learned that with the gradual fading of new energy subsidies, the influx of foreign enterprises, and the arrival of the marketization stage of new forces in car manufacturing, the market has raised a new question for new energy vehicle companies - can they make money by selling new energy vehicles? The Double
There are many types of circuit boards with different names, which can be named based on materials, layers, inherent characteristics, and other aspects. For example, there are: single panel, double-sided board, multi-layer board, HDI, fast board, FR4 circuit board, ceramic circuit board, alumina ceramic circuit board, aluminum nitride ceramic circuit board, circuit board, PCB board, aluminum substrate, high-frequency board, thick copper board, impedance board, PCB, ultra-thin circuit board, ultra-thin circuit board, Printing (copper etching technology) circuit boards, etc. Circuit boards are miniaturized and intuitive, playing an important role in the mass production of fixed circuits and optimizing the layout of electrical appliances Printed circuit boards (PCBs) are essential accessories in modern electronic equipment. All electronic devices, whether they are large machinery, personal computers, communication base stations, mobile phones, household appliances, or electronic toys
The video measurement system is suitable for measuring prismatic workpieces with intersecting planes. When planes intersect, edges appear, and videos can easily measure edges. Orthopaedic transplantation components are usually composed of continuous and regular curves (artificial hip joint fittings) or complex contour surfaces (artificial knee joint fittings), whose shape is just like the contour of human organ. These surfaces have few or no flat or intersecting edges. Although video sensors are good at measuring edges and surface points, using a large number of data points to obtain data on even linear cross-sections of contour surfaces is very laborious and impractical. Trigger probes also have the same limitations, as they need to approach each point and return to the plateau after triggering - although feasible, they are also not suitable for measuring large quantities of products. The best method to determine whether the bionic curve contour of artificial knee joint meets th
In addition to the wiring on the substrate, the metal coating is the place where the substrate line and electronic component are welded. In addition, different metals also have different prices, and different ones will directly affect the cost of production. Different metals also have different weldability and contact, as well as different resistance values, which will directly affect the effectiveness of the component. Common metal coatings include: copper tin The thickness is usually 5 to 15 μm Lead tin alloy (or tin copper alloy) That is welded, the thickness is usually 5 to 25 μm, and the tin content is about 63% gold Generally only plated in the interface silver Generally, it is only placed in the interface, or the alloy of silver with the whole
Because it is made of electronic printing technology, it is called a "printing" circuit board. Before the emergence of the printed circuit board, the interconnection between electronic components rely on the wires to directly connect to form a complete line. Circuit bread boards exist only as effective experimental tools, and the printing circuit board has become an absolute dominance in the electronics industry. At the beginning of the 20th century, in order to simplify the production of electronic machines, reduce the wiring between electronic parts, and reduce the advantages of production costs, they began to study the method of replacing the wiring by printing. In the past thirty years, engineers have continued to propose a metal conductor on the insulating substrate as a wiring. The most successful is that in 1925, Charles Ducas in the United States printed out line patterns on the insulated substrate, and successfully established a conductor to wiring in an electroplating.
The substrate is generally classified as the insulation part of the substrate. The common raw materials are electric wood plates, glass fiber plates, and various types of plastic plates. The PCB manufacturers generally use an insulating part of glass fiber, non -fabrics, and resin, and then suppressed in epoxy resin and copper foil as "Prepreg". The common substrates and main ingredients are: FR-1-phenolic cotton paper, this substrate is commonly referred to as electric wooden boards (higher economy than FR-2) FR-2 ─ Phenolin cotton paper, FR-3-Cotton Paper, epoxy resin FR-4-Woven Glass, epoxy resin FR-5-glass cloth, epoxy resin FR-6-f f f, polyester G-10-glass cloth, epoxy resin CEM-1-cotton paper, epoxy resin (flame retardant) CEM-2-cotton paper, epoxy resin (non-flame retardant) CEM-3-glass cloth, epoxy resin CEM-4-glass cloth, epoxy resin CEM-5-glass cloth, polyester Ain -aluminum nitride SIC -silicon carbide
It is important to develop a steady test strategy to develop a stable test strategy to ensure the compliance and function of designing a stable test strategy to ensure the compliance and function of designing. In addition to the establishment and testing of these complex assembly, the money invested in electronic parts may be very high -when a unit can reach $ 25,000 when the final test is at the final test. Because of this high cost, the problem of finding and repairing assembly is more important than its past and even more important steps. Today, the more complicated assembly is about 18 square inch inch, 18 floors; there are more than 2,900 components on the top and bottom; it contains 6,000 circuit nodes; more than 20,000 welding points need to be tested. In Langxun Accelerated Manufacturing Factory (N. Andover, MA), manufacturing and testing art -level PCBAs and complete transmission systems. The assembly of more than 5,000 nodes is a concern for us because they are close to
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