Nowadays, the design of electronic assembly tends to be miniaturized, with smaller devices and smaller spacing, pins and pads are getting closer and closer, and the existing gap is getting smaller and smaller. Pollutants may be stuck in the gap, which means that if relatively small particles remain between two pads, it may cause potential [...]
AlN ceramic circuit board, which has the largest demand of customers in the market, is widely used in high-power integrated circuits. Al 2O 3 and BeO ceramics have been used in the circuit board materials, but the thermal conductivity of Al 2O 3 substrate is low, and the coefficient of thermal expansion does not match [...]
An important progress is the development of wire winding technology. At each connection point, a small size wire is wound on a column to form a highly durable and easily replaceable air tight connection. As electronic products shift from vacuum tubes and relays to silicon and integrated circuits, the size and cost of electronic components [...]
With the rapid development of circuit board manufacturing technology, the integration of electronic components is getting higher and higher, and the circuit is becoming more and more complex. After a fault occurs, it takes a lot of time and energy to use the traditional contact diagnosis, so the non-contact fault detection method is becoming more [...]
1. Adopt shielding measures It is an effective way to deal with the crosstalk problem that the circuit board provides packet ground for high-speed signals. But. It makes the limited wiring area more congested. In addition, in order to achieve the desired purpose of ground wire shielding, the distance between ground points on the ground [...]
The utility model relates to a high-density interconnection circuit board of any layer, which includes at least two layers of inner core plates. The inner layer board core is provided with several embedded holes and core grooves. The core groove can provide considerable tension for the copper drilling, improve the yield, coating copper on the [...]
On April 29, the afternoon closing news showed that the concept of printed circuit board fell, led by 0.802% of Shanghai Electric Power Co., Ltd., and shares of Zhengye technology, Shenghong technology, Eaton electronics and Mingyang circuit fell. The listed companies of leading shares of PCB include: Shanghai Electric Power Co., Ltd.: leading position. PCB [...]
Basic knowledge of PCB copper foil 1、 Brief introduction of copper foil Copper foil: a kind of cathode electrolytic material, a thin, continuous metal foil deposited on the substrate of PCB, which is used as the conductor of PCB. It is easy to adhere to the insulating layer, accept the printing protection layer, and form [...]
1) There are two kinds of circuit board connectors: single lead and multi lead, as shown in Figure 119（ a) For single lead connector, (b) for multi lead connector. They are characterized by flexible use, small occupation area, easy to plug, pull and so on. The structure of the utility model is that the socket [...]
With the development of science and technology, the measurement accuracy of various components is required to be higher and higher, so the requirements of image measuring instrument are also more and more stringent. Image measuring instrument is the product of the perfect combination of traditional optical projection and computer, which is a technological leap compared [...]