Apple seems to be very interested in the concept of invisible buttons. Although the company had little action in this area before, it recently launched a technology called iBeacon. Using iBeacon positioning technology, iPhone and Android mobile phone users can accurately locate their current location, the accuracy can reach centimeters. You can think of iBeacon positioning technology as GPS technology for indoor use, but its accuracy is higher than GPS. The emergence of this technology allows developers to have more choices when defining invisible buttons, and also brings more possibilities.
So what benefits can Apple and consumers get from this innovative technology? Apple can access more user devices and consumers can make full use of their devices. Recently, Apple has just deployed iBeacon technology in its retail stores. When consumers enter the store, their iPhone can receive promotional information.
At the moment, companies like Estimote have not been idle. They are already selling to various retail outlets the equipment they can produce to launch iBeacon signals. Apple's opening of the technology to third-party hardware makers such as Estimote shows that Apple hopes this technology will become popular and become an industry standard. It is worth noting that these iBeacon-compatible signals (that is, Bluetooth low-power signals we are familiar with) launch devices that not only support the iPhone, but also support Android and Windows phone phones. This also shows that Apple hopes to control this type of device. All mobile phone technology standards. This means that the invisible button we mentioned earlier will be everywhere, even when you touch your phone screen, tap the smartwatch screen, or the surface of any other device, it may trigger an invisible button. In addition, this technology is also very likely to be built into credit cards, and may also be embedded in our clothes, or other wearable devices such as fitness sensors, wristbands and even temporary tattoos.
A plano concave lens is an optical lens with one concave surface and one plane surface. It has a negative focal length, and can be used for light projection, beam expansion, or to increase focal length of an optical system.
Plano-concave lenses diverge a collimated beam from a virtual focus and are commonly used in Galilean-type beam expanders. Given their negative focal length and negative spherical aberration, plano-concave lenses can be used to balance out aberrations of other lenses in the system. Realpoo Optics provides plano-concave lenses fabricated from N-BK7, N-SF11, UV-fused silica, calcium fluoride, and zinc selenide etc.
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