Civilization Template

Chapter 120 Four Tweezers
1990 2 Month 11 Day.

Two days passed in a blink of an eye.

The venue for the IEEE MEMS conference is the Travemünde district of Lübeck.This Travemünde district, which can also exist alone, is called Travemünde City, a seaside town and a famous beach resort.

Early in the morning, all the parking lots near the exhibition hall where the conference was held were full.

Some vehicles are exhibitors and individuals who come by car.But most of them are news media who heard that big news is about to happen and come to join in the fun.

In addition to those who came by car, there were more students or scientific researchers who came from surrounding cities by train or bus.

The influence of MEMS technology has spread to not only people in the semiconductor field, but also scientific researchers in other industries have begun to face up to this brand new processing method.

In the venue, after Professor Muller announced the start of the meeting, he directly introduced the next speaker, Chen Quan, to the audience.

The news that an important paper was about to be announced gradually spread. The conference organizer, Catherine, discussed with the company leaders, and simply discussed with the Humboldt University of Berlin, which ranked first, and gave up the position.

Holding a box of slides, Wei Chunyu followed Chen Quan's footsteps and walked up to the low podium.

His identity is both an assistant and a translator. In case of any problems with Chen Quan's English, he will make up for it in time.

Due to time constraints, the two of them didn't even have a chance to practice together. They could only rely on the tacit understanding cultivated during the Mathematical Olympiad.

When Wei Chunyu turned around, he saw countless cameras, several video cameras, and foreigners of various skin colors, ages, and genders.

Everyone was looking at themselves and Chen Quan beside them expectantly.

It is not wrong to say that everyone's eyes are on Wei Chunyu.He was the one who actually operated the slide projector.

As Wei Chunyu put the first slide on the glass surface of the slide projector, and the projection of the first photo appeared on the curtain behind, there was immediate applause in the venue.

This photo, which has appeared in countless media and is familiar to people all over the world, is a photo of cells held by MEMS tweezers.

It is this photo that pushes the popularity of MEMS to a world-class peak.

Everyone present is actually the beneficiary of this photo.

Amid the applause, Chen Quan didn't say a word, and motioned Wei Chunyu to change to the second one.

When the second photo appeared on the curtain, the audience fell silent.

Because this is also a picture of cells being held by forceps.

The difference from the last photo is that the structure of the tweezers is significantly different from the first heat-stretch tweezers.

"The tweezers use electrostatic attraction. The principle is to inject oppositely charged charges on the two electrodes, and use the attraction between the oppositely charged electrode plates to control the relative movement of the electrode plates by controlling the amount of charges."

Chen Quan finally started to explain.

This photo was part of his thesis that he was going to take out.

Unlike the photos of the heat-retractable tweezers, the new photos were taken without much effort.

First of all, everyone's shooting skills have been practiced.Secondly, when designing the tweezers, the stop point is considered, so that the tweezers will not clamp to the bottom, and there is no need to face the problem of cells being crushed.Finally, without the pressure of going to the CNS, there is no need to be selective.

As soon as Chen Quan's words fell, the audience burst into applause again.But this time the applause was significantly weaker and more of a courtesy.

Because all listeners know, next, Chen Quan should introduce, the formula of electrostatic tweezers, technical details, etc.

But Wei Chunyu changed the slide to another one.

What is shown on the curtain is a pair of tweezers with a completely different structure from the previous two, except that the middle cell is missing.

But at this time, none of the scientific researchers present cared about the cells anymore.Because Chen Quan began to explain:

"This is a tweezer driven by electromagnetic force. As we all know, through electromagnetic force, we can control the direction of the object. Now, our tweezers can not only close, but also open!"

After hearing Chen Quan's words, many people stood up and approached the podium, trying to see more clearly.

Thermal expansion and contraction, and electrostatic attraction, are two common structures.For example, the world's first micro-motor uses electrostatic attraction.

But the presence of electromagnetic forces on MEMS is extremely rare, perhaps unique at all.

Under Chen Quan's signal, Wei Chunyu quickly changed to the fourth slide.Another tweezers with a new structure appeared in front of everyone.

"This tweezer is driven by inverse piezoelectricity. The principle of inverse piezoelectricity is."

Inverse piezoelectric is also an extremely rare MEMS actuator drive method.

The tranquility and order in the venue were completely broken.

Everyone understood what the appearance of these four tweezers represented.

Four actuators with different principles represent four different development directions of actuators.

The advantages of electrostatic mode are low power consumption, short response time, suitable for higher frequency driving, and the structure of electrostatic driving is relatively easy to implement.

The scientific community has studied the principle of electrostatic drive most thoroughly. The micro motor in 1988 was based on the principle of electrostatic drive.

Thermal expansion and cold contraction, the power consumption is relatively high, and the response speed is not fast, but the advantage is that the structure is the simplest, and the advantages and disadvantages are equally prominent.

The advantage of the electromagnetic method is that it has a high output torque, which can attract and repel, and is a relatively promising driving method.Its disadvantage is also very obvious, that is, the structure is complex.Because, in order to generate electromagnetic force, it is necessary to manufacture micron-scale coil windings.

Before Chen Quan showed the photos, there were even only theories, and no one had seen examples.

The inverse piezoelectric mode is the earliest mode studied by humans, because piezoelectric sensors have entered the application stage before the name MEMS appeared.

The advantages of the inverse piezoelectric mode are obvious, piezoelectric and inverse piezoelectric can exist at the same time, and the actuator and sensor are combined into one.

But driven by inverse piezoelectricity, the required voltage is extremely high, as high as 1000 volts. At the micron scale, it is very difficult to handle the insulation well.——
Generally speaking, each driving method requires a lot of exploration and research.

Many scientific researchers, when choosing a driving method, can only randomly choose one that they feel the most.

The process of choosing a scientific research direction is actually no different from gambling.Once there is a mistake in the choice, the greater the investment, the greater the loss.

But now, four directions, four tweezers with different structures and principles, and four successful paths have appeared in front of the world at the same time.

If it is said that Chen Quan's first tweezers brought MEMS to the forefront of the news and occupied the sky, then the four tweezers he took out this time.
(End of this chapter)