Liquid lens, the world premiere of the new generation of Mi MIX!
This is a magical innovation, just like the “human eye lens” is installed in the lens of a mobile phone. The flowable liquid is wrapped by a film, replacing the traditional optical lens, and realizing the change of focal length and focus.
In this way, a lens can be microscopic at close distance and can be telephoto at far.
Related interests, the employees of the only domestic company that independently develops and produces liquid lenses are now commercializing two liquid lenses, one is company o in Switzerland, the other is company v in France, and company v was acquired by Corning. The company o uses film. Liquid lens, which is similar to a lens, is driven by a magnet or a motor, and the film is loosened to change the radius of curvature, thereby changing the focal length. Company v uses two liquids and uses electrowetting. Due to the difference in refractive index, the interface also has A meniscus that changes the focal length after the meniscus is deformed. In addition, there are liquid crystal lenses and a liquid lens driven by a micro-motor from Texas Instruments. Let’s take up the pit first, and then let’s start with the two-liquid lens for detailed explanation of each technology, because the current main product is a two-liquid lens. First of all, in principle, our purpose is to achieve focal length change. Therefore, if you have studied optics in junior high school, It is known that light will be refracted after entering different media, such as the common chopsticks inserted into the water cup, which seems to be bent: then we need to change the focal length, first of all refraction occurs, so the light must enter another medium from the air. Moreover, it must be ensured that the light can come out after entering, so the medium must have a higher transmittance. A two-liquid lens is composed of two liquids, and there is a difference in refractive index between them, so the interface can be refracted. In addition, it is the principle of electrowetting: Lippmann discovered in 1876. He discovered that the surface tension of the droplet will change by applying a voltage on the droplet and on the surface in contact with the droplet. The famous Young’s formula Here: The first COSθ0 is their wetting angle, that is, the angle between two different liquids, which is affected by surface tension and is also related to surface energy; the latter is the dielectric constant of air and dielectric layer dielectric. Constant; the dielectric constant of the dielectric layer is because the founder of V company, Berg discovered that after adding a dielectric insulating layer at the bottom, it can stabilize the change of the liquid and reduce the voltage; γ is the interfacial tension, and d is the dielectric The layer thickness, v is the voltage level. After the above formula is understood, the principle of the two-liquid lens is basically understood: by applying a voltage, the interface between the two liquids is changed. Due to the refractive index difference, the focal length of the liquid lens is changed: o Company’s will update it later.