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A projection keyboard is a form of computer input device whereby the image of a virtual keyboard is projected onto a surface: when a user touches the surface covered by an image of a key, the device records the corresponding keystroke. Some connect to Bluetooth devices, including many of the latest smartphone, tablet, and mini-PC devices with Android, iOS or Windows platform. == History == An optical virtual keyboard〔 was invented and patented by IBM engineers in 1992. It optically detects and analyses human hand and finger motions and interprets them as operations on a physically non-existent input device like a surface with painted or projected keys. In that way it can emulate unlimited types of manually operated input devices (such as a mouse, keyboard, and other devices). Mechanical input units can be replaced by such virtual devices, potentially optimized for a specific application and for the user's physiology, maintaining speed, simplicity and unambiguity of manual data input. In 2002, start-up company Canesta developed a projection keyboard using their proprietary "electronic perception technology".〔(Marriott, Michel (September 19, 2002). "No Keys, Just Soft Light and You". ''The New York Times''. )〕〔(Hesseldahl, Arik (September 18, 2002). "Typing on the table". ''Forbes''. )〕〔(Shiels, Maggie (October 15, 2002). "The keyboard that isn't there". ''BBC News''. )〕 The company subsequently licensed the technology to Celluon of Korea.〔(Kanellos, Michael (September 19, 2006). "Honda investing in chips to help cars see". ''CNET News''. )〕 A proposed system called the P-ISM combines the technology with a small video projector to create a portable computer the size of a fountain pen.〔(Wave Report USTA Telecom 2003 )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「projection keyboard」の詳細全文を読む スポンサード リンク
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