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 [...]
On June 24, Zhongjing Electronics (002579) answered the concerns of investors on the investor relations platform. Investor: due to the epidemic, the production capacity of flexible circuit board manufacturers in Southeast Asia and South Korea is affected. Has the price of flexible products of Zhongjing electronics increased? Has the performance improved significantly? Secretary of Zhongjing [...]
Real time monitoring of wound healing is still a major challenge for clinical tissue regeneration. Biomaterial guided on-site monitoring of wound healing is needed. Recently, Shanghai Univer professor Gao Jie / Zhejiang Province People's Hospital Dr. Zhang Lei / Fudan University Zhongshan Hospital Dr. Jiang Libo / Hubei University professor Li Yulin research team proposed [...]
Press fit technology is most widely used in motor assembly. Such as pressure bearing to rotor, pressure clip spring, pressure silicon steel sheet to rotor, pressure commutator, pressure bearing to shell and so on. In the motor assembly industry, many processes such as commutator bushing, motor shaft end bearing, rotor stator assembly, motor shaft core [...]
China is one of the few countries in the world that have mastered advanced superconducting material technology Over the past decades, scientific and technological workers have been unswervingly committed to tackling key problems Expect to find more new superconducting materials And expand its application field through mechanical modification Superconductors are superconductors A conductor with zero [...]
The circuit board is particularly sensitive. If the potting glue is not used in the manufacturing process, once it experiences turbulence, it is easy to vibrate and collide with the electronic components, resulting in electric shock reaction. This situation is a fatal blow to the electrical appliances, so in the production process, the circuit board [...]
First, we need to prepare a scrap circuit board, hydrogen peroxide, toilet cleaner, gloves, goggles, disposable cups, beakers and coffee filter paper. Second, if the circuit board you are preparing is large, break it into a size that can be put into a beaker. The third step is to clean the dirt on the surface [...]
1. Weldment must have good weldability The so-called weldability means that the metal material to be welded can form a good alloy combination with the solder at a suitable temperature. Not all metals have good weldability, some metals such as chromium, molybdenum and tungsten have poor weldability; Some metals, such as copper and brass, have [...]