A new method of electronic component assembly usin

An international research group has developed a new mechanical operation method based on optics to protect the life of the experimental machine. One day, it can be used for the mass production of electronic components in intelligence, computers and other equipment. This is a cheaper and faster way to produce these parts, which can reduce the production cost of daily necessities from clothes to household appliances to Internet, thus promoting the concept of the so-called IOT. Micromanipulation technology may also be used to create a safer and faster charging battery

optical trap uses light to keep and move small objects in liquid. It is a promising non-contact electronic and optical device assembly method. However, when using these traps to make applications, the liquid must be removed, and the process tends to replace any formed patterns or structures with optical traps

as shown in the above figure, researchers assembled a string of solder beads with photoelectric tweezers. By removing the liquid by freeze-drying, the assembled beads remain fixed after the liquid is removed

in the Journal opticsexpress of the American Optical Society (OSA), researchers from stevenneale research group of the University of Glasgow, Scotland, introduced in detail that their use method is an advanced optical capture method, called photoelectric tweezers, which can be used to assemble electrical contacts. Shuailongzhang, a member of Neale's research team, developed an innovative freeze-drying method to remove liquids without affecting the assembly of components

Neil said, "compared with the traction beam similar to Star Trek, the force formed by these photoelectric tweezers can move objects into the medium without any objects touching them." This is reminiscent of the image of the assembly line without a manipulator. Instead, discrete components can almost magically assemble themselves under the guidance of light mode. "

researchers proved this technology by assembling a tiny solder bead and photoelectric trap, removing the liquid, and then heating the pattern to fuse the beads together to form an electrical connection. They used solder beads to prove that in the future, these particles can be assembled and fused to create electrical connections

"photoelectric tweezers can realize particle parallel micromanipulation under very cost-effective conditions," said Zhang, who is now at the University of Toronto in Canada. "In principle, we can move 10000 beads at the same time. Combined with our freeze-drying method, it creates a very cheap platform suitable for large-scale production.

improved electronic manufacturing technology

this new technology can provide an alternative circuit board to connect components in most electronic products. These types of devices currently use automatic machines to pick up tiny parts, put them on circuit boards and Welded in place. This process requires an expensive maneuvering stage to position the board and an expensive high-precision manipulator to pick up and place tiny parts on the equipment. The cost of these operating systems will continue to increase as the size of electronic accuracy requirements shrinks

"optical tweezers and freeze-drying technology can be used not only to assemble solder beads, but also to assemble a wide range of objects, such as semiconductor nanowires, carbon nanotubes, lasers and micro LEDs," Zhang said. "Finally, we hope to use this tool to assemble electronic components, such as capacitors and resistors, as well as photonic devices, such as lasers and LEDs, in a device or system."

photoelectric manipulation captures particles

researchers use photoelectric tweezers because this optical operation method can form thousands of traps at the same time, providing the potential for large-scale parallel assembly. Tweezers are made of a layer of silicon, which changes its conductivity when it comes into contact with light. In the area illuminated by light, an uneven electric field forms and interacts with particles or beads in the liquid layer on the top of silicon, making particles move accurately through moving light spots. Creating a light spot mode allows multiple particles to move at the same time

zhang said, "using our method, we can move the solder beads in the nanoscale range to about 150 microns. We have been able to move objects more than 150 microns, but it is more challenging because the size of the object increases, and the friction also increases."

in the above figure, after assembling a series of solder beads (a) with photoelectric tweezers, researchers freeze the liquid (b), and then reduce the pressure to directly convert the frozen liquid from solid to gas, and dry the equipment (c). Then, they heat the beads to fuse into an electrical connection, which requires higher wear resistance and thermal performance

after assembling a commercially available mode with a diameter of 40 microns with photoelectric tweezers, researchers put the liquid in the photoelectric tweezers device and reduce the surrounding pressure, so that the frozen liquid can directly change from solid to gas. This freeze-drying method allows the assembled solder beads to remain fixed after the liquid is removed. Researchers say it can be used to remove any type of optical trap, even the liquid used in traps formed by sound waves

in addition to assembling solder beads into different lines, researchers also demonstrated the parallel installation of several beads. Each year, the infrastructure protection and water and electricity transfer cost of the staff residential area is up to 30million yuan, and the beads are used to form an electrical connection. Solder beads exhibit strong dielectric power, which means they can move accurately and quickly, making a very effective assembly structure

researchers are putting their laboratory based system into a single unit that will combine photoelectric tweezers and freeze-drying processes. They also developed a software interface to control the generation of light patterns according to the number of particles that need to be captured

calibration method of Zhan material testing machine; Correction method of tension machine; G, the revision method of tensile testing machine, said: "we now use a computer to generate micro patterns to move beads, but we are developing an application that can replace it with a tablet computer or intelligence. For example, it can let people stay away from the system and control the movement of particles with their fingers."