Countercurrent 1982

Chapter 1002 Double-sided multilayer circuit board

"Manager Duan, this is a newly processed circuit board. Let's see how it looks." At this time, Zhao Xuewu, who was working in the clean room, came to Duan Yun with a newly made circuit board.

"Not bad." Duan Yun looked at the circuit board in his hand, and said to Zhao Xuewu, "How is the quality of the products produced recently?"

"Extreme fatigue tests have been carried out in the laboratory. The new product has been running for 5 days and 120 hours without failure. Other domestic products tested during the same period have experienced motor speed out of control and increased noise. From this point of view, our new product Compared with similar domestic products, the quality is very good.”

During this time, the research institute has been testing the operation of new products, including long-time playback, bump tests, fatigue tests, and even high temperature and cold weather tests with refrigerators, freezers and electric stoves. The set of test programs for researching military equipment was carried out.

The durability of civilian products is definitely not as good as that of military products. There is no doubt about it. It is obviously too strict to test Duan Yun's new recorder with these strict standards.

Generally speaking, high-quality products mean high costs. It is very difficult for you to spend one yuan to use almost the same technology to produce 10 yuan quality products. This is a very objective law, so Duan Yun’s new The product must find a balance between product quality and cost, which not only makes the price of the product have an advantage, but also has no obvious shortcomings in quality, this is what Duan Yun wants.

Therefore, although the testing of new products is very strict now, in fact, when they actually enter the production stage, the quality inspection standards will be much lower. It is only necessary to maintain the same or slightly higher level as similar domestic products, and then use the price advantage to occupy market.

"Can the cost of our products be further reduced?" Duan Yun asked Zhao Xuewu.

"Manager Duan, the cost of our current products is already very low, because we use a single-motor drive mode, which can save about 1/5 of the cost compared with the peers. We have also made many improvements to the product these days. In terms of cost, the current It has been compressed to the limit, unless there are more advanced equipment and technology for process improvement, otherwise there is very little room for decline..." Zhao Xuewu said with a slight frown.

"This circuit board is still a bit big..." Looking at the finished PCd circuit board in his hand, Duan Yun pondered for a while and said, "Is there any way to make the circuit connection of this circuit board more tightly?"

"At present, the design of this circuit board has been improved several times. If the electronic components are too close, on the one hand, it will easily cause the temperature of the circuit board to be too high, and the heat dissipation problem between the electronic components will be difficult to solve. On the other hand, It’s just that the solder joints on the circuit board are too many and too dense, and accidental short circuits are prone to occur, which will burn the entire circuit board...” Zhao Xuewu said in a bit of a dilemma.

"Yeah." Duan Yun nodded lightly upon hearing this.

In fact, he also knows that the circuit boards of the new tape recorder are already very dense for the questions raised by Zhao Xuewu, and the design has indeed been optimized to the maximum. The layout has fully considered the heat dissipation of the circuit board and the difficulty of the process, and there is indeed very little room for optimization and improvement.

Duan Yun is already very satisfied with the current circuit board design, but he only thinks about the development of Walkman in the future, so he thinks about the feasibility of making the components on the circuit board more dense.

"By the way, Master Zhao." Duan Yun seemed to suddenly recall something, and said to Zhao Xuewu: "Have you ever used double-sided and multi-sided PCBs before?"

"Double-sided circuit boards have been used, and multi-layer PCBs cannot be produced in China at present, but if there are double-sided boards, our recorder circuit boards can be optimized again." Zhao Xuewu said.

Zhao Xuewu is no stranger to double-sided circuit boards. When he was in Taiyuan Institute of Mechanical Engineering, he often used this kind of circuit boards printed with metallized holes on both sides.

In fact, the development of single-sided printed boards began in the mid-50s in New China, which was first used in semiconductor radios. In the mid-60s, my country's foil-clad board substrates were self-reliantly developed, making copper foil etching the first choice for PCB production in my country. The leading process, most of the manufacturers in Shenzhen that produce Pcb circuit boards still use this process, which causes heavy pollution and low output.

In the mid-to-late 60s, the country was able to produce small batches of double-sided metal chemical printed PCBs, and began to develop multi-layer boards in a few units. In the 70s, the pattern electroplating and etching process was promoted in China, but due to Due to various disturbances, special materials and special equipment for printed circuits did not catch up in time, and the entire production technology level lagged behind foreign advanced levels. By the 80s, this gap was already very large.

In fact, Duan Yun can also buy double-sided circuit boards here in Shenzhen, but the current output of this kind of circuit boards is very small, basically only supplying joint ventures and large state-owned factories, and private companies have no purchase channels. It is much higher than a single-sided circuit board, and it is not cost-effective to use it to make products.

"Master Zhao, how much do you know about the manufacturing process of double-sided PCB circuit boards?" Duan Yun asked.

"I only know his production principle, but we need some equipment to mass-produce this kind of double-sided circuit board. At present, only some large factories in our country have it..." Zhao Xuewu replied, and then asked repeatedly: "Manager Duan , you don’t want to produce this kind of circuit board yourself?”

"I have this idea..." Duan Yun thought for a while and said.

"Then you can only buy equipment from other electronics factories, but it is not certain whether you can buy it. The electronics factory that can produce this double-sided panel is definitely not a small factory. No matter how much money you pay, they may not be willing to sell it. Here it is." Zhao Xuewu said.

"Yeah, it's really difficult to buy ready-made equipment, and the investment in making double-sided multilayer circuit boards is high, polluting, and requires a lot of industrial land. It's really not cost-effective for us to produce it ourselves..." Duan Yun said with a sigh.

In fact, Duan Yun really intends to produce circuit boards by himself, but in addition to funds and channels to purchase equipment, there are also land restrictions. Although Duan Yun wants to acquire 60 acres of industrial land from the SZ city government this year, this industrial land Two large factories have been built, mainly for the production of main parts and assembly of new tape recorders. There is no more space for the production of circuit boards, and the production of circuit boards is very polluting, requiring sedimentation tanks, sewage treatment facilities, This is a very large investment. Once the circuit board factory is established, the environment of the entire factory will deteriorate rapidly...

(End of this chapter)