Li Xing didn't say anything big, and the next day he found Zheng Nan with a plan.

"Director Zheng, I think the main reason why we can't move forward with a higher process now, in addition to lithography skills, is that we can't make the corresponding photomasks."

The principle of contact lithography is to use the light carving knife to project the desired chip pattern on the silicon wafer below in an equal ratio of 1:1 through the light mask shading.

In other words, how fine the process can be made by the following chips depends on how many photomasks you can make, you can't take a one-millimeter photomask to make a 10-micron chip, on the contrary, if you can take out a one-micron photomask, it may not be impossible to make a one-micron process chip.

"I don't know much about lithography, so I can't give any advice, but I have a good idea for a finer photomask."

"I've seen the photomask production in the radio factory, all of which are directly carved on the photomask glass with a carving knife, and this technology is destined to be unable to advance more finely, and my idea is that if we can use a high-definition camera, first take pictures of the chip drawings, use the camera's zoom technology to expose the negative, and then find a way to make the negative into a photomask, we can get a high-precision process photomask."

Zheng Nan was very interested: "Director Li, you can do it, this idea is so good!"

Indeed, the working principle of a camera is to store a large image zoom on a one-inch negative, so if you zoom the chip drawing on the bottom film using this principle, you can indeed get a micron-sized photomask.

"But there are two problems here, one is the scaling, how large the drawing can be scaled by the camera to get a suitable negative; The second is how to make a photomask for this kind of camera negative, and the materials are different." Zheng Nan raised his concerns.

Li Xing waved his hand and said that there are ways to solve this, the first point is that he can calculate carefully, and at the same time, he must do more experiments.

The second point is even simpler, Li Xing said that the material of the negative is naturally close to the photomask, and it can be used directly without too much processing.

Zheng Nan nodded in understanding, just like the kind of projection slides used in schools now.

"The biggest problem right now is the camera." Li Xing said, "Because the most important thing in this step is to leave a textured pattern on the negative, which requires a high-definition camera, and ordinary home cameras can't achieve the goal at all."

Li Xing glanced at Zheng Nan embarrassedly and said that he might have to trouble Director Xu: "After all, this kind of high-definition camera can only be found in TV stations."

Zheng Nan nodded and said that there was no problem: "I'll call her later, I can borrow it, if I can't borrow it, we can rent it, or buy it through Director Xu's connections, because this thing will be used a lot in the future."

After talking about Li Xing's matter, Zheng Nan also took out his notebook and handed it out: "Director Li, look at the projection lithography mechanism I thought of last night, see if it can be realized."

Li Xing is working hard, and Zheng Nan is also not idle.

Maybe Zheng Nan is not a chip engineer, but thanks to the information explosion of later generations, especially the era when later generations were stuck in the lithography machine, all kinds of popular science videos about lithography machines are flying all over the sky, and Zheng Nan has also seen the real and fake.

Now Li Xing has encountered a bottleneck in upgrading the technology of the lithography machine, and he has to come up with something no matter what, otherwise he will be too sorry for the identity of the reborn.

Others are reborn to copy songs and poems, but it's not too much to copy a lithography institution yourself.

Besides, I also copied it for the rise of Huaxia chips, which is ideal!

Li Xingcai picked it up, and then he was dumbfounded, and it took a long time to say with a wry smile: "Director Zheng's painting skills are a bit philosophical."

Zheng Nan's old face turned red, and then he remembered that he had no painting skills at all, and the things he painted were very abstract, unlike Li Xing and Zhou Minde, Zheng Nan really didn't know how the drawings they drew could be so neat, and they were the same as taking pictures.

Do you need to learn to draw before you become an engineer these days?

"Don't care about these details, Director Li, you mainly look at my concept, through similar diving

The optical reflection and refraction principle of the telescope allows the mask to be picked up from the photoresist and projected onto the silicon wafer as if it were watching a movie."

Zheng Nan thought for a moment and then said, "This is what I heard by chance in Ninghai, probably this logic, Director Li, you can see it."

Li Xing stared at Zheng Nan's notebook seriously for a while, then picked up the paper and pen on the desk, and drew a new design plan.

Zheng Nan just glanced at it and said happily, "That's right, that's what I want to paint!"

Li Xing raised his head: "Director Zheng, where did you hear about this lithography machine design plan?"

Zheng Nan was stunned: "At the optical instrument factory, at that time, the little devil was about to buy the instrument factory, and the little devil's company also happened to make lithography machines, it was a coincidence that they called, thinking that I couldn't understand English, and they didn't shy away from me, so I just heard it."

Zheng Nan said word by word, stumbling in the middle, obviously made up, but then Zheng Nan immediately asked, "Is there anything wrong with this design plan?"

Li Xing shook his head again and again: "No, not only is there no problem, on the contrary, this plan is simply very good!"

"It may seem a bit rudimentary, but it is undeniable that this is a very mature design for the next generation of projection lithography machines!" Li Xing was very excited, "Director Zheng, you are simply the child of destiny!"

Zheng Nan breathed a sigh of relief, it's okay, Zheng Nan is really afraid that he will paint with his impression, and the result will be worthless, but now it seems that it is still okay.

"Can we continue to work on this plan, and we will try to upgrade the next lithography machine?" Zheng Nan asked.

Li Xing nodded and said that it was theoretically possible: "It's just that this time the lens is not enough, and there are still a few total mirrors missing."

Zheng Nan did not hesitate to immediately dial the phone of Ninghai Optical Instrument Factory and asked people to call Zhuang Wei in the workshop.

Zhuang Wei hurriedly ran over, and listened to Zheng Nan's request to relax, it turned out to be just a total mirror, he thought that the lens of the lithography machine was broken, so he said very boldly: "The total mirror is easy to get, there is not too much processing, mainly in the coating, if Manager Zheng needs it, I can make at least thirty pieces today and send it to Jiang Xia."

Li Xing nodded excitedly beside him.

Zheng Nan then told Zhuang Wei to send him thirty total mirrors first.

The moment he hung up the phone, Li Xing was about to jump up with joy, and danced excitedly: "Great! With these total mirrors, I have the opportunity to develop a projection lithography machine, which is more advanced than the 65 lithography machine and does not require contact!"

Zheng Nan can understand Li Xing's excitement very well, after all, if he could, which engineer would be willing to archaeology past products, and which engineer would not want to develop new products?