Chapter 89 The birth of the second generation lithography machine
The lithography machine movement system that Zhao Ye designed for this lithography machine is implemented using the lever principle.
After all, this machine is still almost purely manual. Zhao Ye uses a precision screw rod and a precision gear set to enlarge the movement distance of the base many times, so that the handwheel set outside the lithography machine can rotate for a full rotation.
The circle and the base are displaced by two microns according to the design. This is almost the limit of this era.
There are seven such handwheels on the operating table of the lithography machine, which respectively control different movement paths of the base. After the system was installed, several experts immediately started testing. The testing work was even slower than the installation.
After the test work was completed, the entire basement burst into warm applause.
"It's incredible, it's great! This is simply a miracle!" The people responsible for the measurement all clapped their hands vigorously and gave these senior technicians warm applause.
These precision machinings were all completed by Zhao Ye bit by bit by hand. The final movement accuracy shocked the precision measurement experts.
To achieve such precise displacement is not simple at all.
The applause stopped and work continued as usual.
Some of the measurement equipment was dismantled, and some were retained. Then it was the lens group's turn to be installed.
Zhao Ye also had several senior fitters who came to support him. They installed the entire system step by step. It took a full week before the first piece of equipment was officially born and passed the test.
Everyone was moved to tears. This is almost a representative work of the country's precision instruments! At this moment, it can even be said to be one of the most sophisticated instruments in the world.
After everyone was excited, they took a group photo. The only one who didn't smile was Professor Quan.
"Professor Quan, tomorrow is trial production. The success or failure depends on your light bulb!" Before Zhao Ye came forward to speak, Professor Ci had already pulled Professor Quan and said this. This made Professor Quan even more nervous.
point.
"Try to pass it once, try hard!" Professor Quan did not dare to speak too highly. To be honest, he was really unsure.
When Zhao Ye saw what the other person said, he didn't go over and say anything. He was already so nervous, so he stopped putting pressure on others.
At this time, no matter what comforting words you say, what is fed back into the other person's mind is invisible pressure.
Zhao Ye walked out of the underground workshop and went to see the processing of silicon ingots.
At this time, the silicon ingot has expanded from the initial diameter of 30MM to about 50MM. The silicon ingot was produced by a factory in Shanghai. With the help of some information provided by Zhao Ye, they successfully produced the silicon ingot with this specification.
Silicon ingots. Although the purity of silicon ingots needs to be improved, they are at least usable, but the yield rate is lower.
However, with Zhao Ye's bug, he can still handle a small amount of silicon ingots.
Zhao Ye fumbled around on the cut silicon wafer for a while, picking up this one and then that one. Outsiders thought he was observing the quality of the cutting, but no one knew that he was handling the wafer.
You can't really follow the real yield rate, right? That would be too torturous. After passing through his hands, the yield rate immediately went up. If anyone asks why, it's just a coincidence. It's a coincidence. The other party's production is careful.
.
Another point is that the diameter of the current wafer is still very small, but the processing accuracy of Zhao Ye and others is far from enough. So Zhao Ye and others gave up the idea of cutting the wafer into a rectangle, and instead made the chip into a circle.
shape.
However, circles also have disadvantages of circles. The most important one is that the direction and position cannot be distinguished. This is very inconvenient during processing and use.
Zhao Ye then thought of a way. Since a perfect circle is not possible, just give it a cut. So we have the current wafer. Each piece has a thirty-degree arc cut off, which is the entire cross-section.
A fan-shaped area becomes a triangle.
In this way, the side where the piece is cut is directly above. In addition, for the purpose of positioning, three small gaps of different shapes are opened below this straight side. This allows the various parts of the processing to be processed.
You can clearly know the front, back and direction of the wafer at every step.
After breakfast the next day, dozens of people came to the underground workshop. Everyone wanted to witness the production of the first such large-scale integrated circuit. Even the ** Daily sent a special photographer
The reporter, a video camera and a camera were placed on one side of the lithography machine.
Zhao Ye and Ma Hua were the first to start trial production. The camera clearly recorded the first silicon wafer that Zhao Ye picked up.
Since it is trial production, the design of the circuit is actually not very complicated. However, in order to verify some technologies, some parts are designed to be relatively detailed and complex. But even so, this group of thirty wafers used for testing,
It still took a whole day to get out of this workshop.
When the first wafer was simply packaged, it was immediately taken to the special testing equipment by the test team waiting aside. After a while of waiting, everyone watched one wafer after another being placed.
Going up, everyone's hearts were in their throats.
"The report states that there are a total of thirty silicon wafer circuit boards for testing samples, of which twenty met the requirements, five failed due to purity issues of the silicon wafers, and five failed due to production issues. Our yield rate reached
66.66%! We succeeded!”
"Oh!!! It's successful, it's successful!" Everyone clapped and jumped. Even the soldiers at the door were excited. If it weren't for the regulations, they would probably have fired a few shots into the air to enjoy themselves.
The camera never stopped at this time. Although the camera reporter was also very excited, he still knew his duty and stayed loyally behind the camera. His hands were just a little shaky. Fortunately, he brought a stand, otherwise it would have been so difficult.
The screen cannot be viewed.
After the trial production of the lithography machine, it took a few days of adjustments. Then it was put into the production of display chips again. Zhao Ye did not do it himself this time, but asked Ma Hua and other technicians to take over the operation.
It is certain that they are unfamiliar and wasting materials, but everyone has a process of becoming proficient. Zhao Ye can't do it by himself every time, right? To cultivate talents, you have to pile up materials and time! There is no shortcut
Walk.
The production of the photolithography machine has given the design team great encouragement and pressure. The design work on their side has not been completed yet, but the production team has already started production. Doesn't this mean they are like soldiers holding weapons and other ammunition?
This gave the design team a great sense of urgency. Zhao Ye saw it, but he was not too anxious. Because the complete design drawing was already lying in his space at this time, and he had even finished processing the mask.
Zhao Ye was not in a hurry to take out the things. The design was just to force them.
Zhao Ye continued to develop his various groups, and the display group made the fastest progress. This aspect was due to Zhao Ye's mature design plan, but more importantly, the supporting units were awesome! The 718 factory was really not built.
From technical experts to senior technicians, the overall level is much higher than that of other units!
They have mastered the liquid crystal filling process, and are now concentrating on circuit etching of glass plates. If they can understand this technology thoroughly, Zhao Ye is sure that their factory can survive for fifty years! Because of this technology,
It is the basis of future liquid crystal technology. In the future, if they have such a patent, they will be able to pay their wages without doing anything.
There was nothing important today, so Zhao Ye wanted to go home early. During this period, he either left early and came back late, or he couldn't go back for several days in a row. Father Han and his family came over and asked Zhao Ye to follow them
Get closer to each other more often. But where does he have so much time?
Taking advantage of the fact that there were few things to do today, he hurried home. But unfortunately, Ding Qiunan took several children out to play today, and only Mother Han was at home.
"Mom, why didn't you go with me?" Zhao Ye now calls them, rarely using their last name. After all, Zhao Ye respects and is moved by Han's parents and Han's mother. For so long, they have really given
The warmth of his family.
"I've been in the capital for a while. I've seen everything here, so I don't want to go there again." Mother Han didn't tell the truth, and Zhao Ye didn't care. The nature of her work determined that she couldn't act like a normal person.
People live like that.
"Yezi, I want to discuss something with you. I originally wanted to find a time to go to your place, but you happened to be here today. I wanted to ask your opinion privately first."
Zhao Ye was stunned and asked in private? How should we understand this?
"Tell me, why do you still want to ask my opinion?"
"My task has been completed. With the approval of the organization, you have the right to know about this matter. Now there is something that I need your opinion on." Mother Han's expression became a little more serious, but she did not lose the smile on her face.
"Well! You said."
"If we provide high-quality transistors to the outside world, will it cause harm to ourselves? You are a professional and I want to hear your thoughts."
"Oh! This, I don't think it will be harmful." Zhao Ye came to a conclusion first, and then continued: "First of all, this is not a great thing. Our current new process only improves the quality of the product.
And the yield rate has not fundamentally changed anything, so, according to the merchants, our product is just more cost-effective."
"Well, that's true. What else is there?" Mother Han continued to ask.
"Also, this matter is not only harmless, but it is a promotion for us, allowing us to maintain the motivation to improve. Whether it is product development and production, there is no end. Only by keeping making progress can we always be ahead of our opponents."
Mother Han nodded. This is roughly in line with the organization's idea. There is another point they didn't mention, which is that the profit of this thing is very good. It is more cost-effective for us to export this thing than to export minerals. We have made a few containers in the past.
of foreign exchange, even more than a whole shipload of minerals.
"Then do you think your calculator can be exported?" Mother Han asked further.