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UBeam
uBeam is a U.S. company that is developing a wireless charging system that is designed to work via ultrasound. The company claims that its product will be safe, legal, and will work by delivering power in a directional focused beam. The company has received $23.4 million in investment.
Some other observers have been more critical, stating that the company's claims are unlikely to be achievable within safe power limits. Critics have cited problems such as the difficulty of achieving high efficiency in sound transfer, the difficulty of achieving an unobstructed path for the beam, the high absorption of high frequency ultrasound in air, and thus the likely short range of the product, and the possibility of headaches, nausea, or hearing damage at power levels high enough to be effective.
In November 2015, the company released technical specifications for its proposed system, stating that its power beam would use ultrasound with a frequency of between 45 kHz - 75 kHz, with a sound intensity of 145 dB to 155 dB, and that it would use a phased array technique to direct the beam.〔 The company claims that safety is ensured since the beam will cut out automatically if it is intercepted by objects other than the receiver.〔
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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