US Patent 7023425 Data input device power management including beacon state
Patent 7023425 was granted and assigned to Microsoft on April, 2006 by the United States Patent and Trademark Office.
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Power management is provided in a user operated data input device utilizing proximity sensing and switching between three or more power states. Switching between the power states occurs based upon the presence or absence of input activity, and an operation instrumentality (e.g., a hand) in close proximity to or contact with the device. Capacitive proximity sensing is carried out be detecting a relative change in the capacitance of a “scoop” capacitor formed by a conductor and a surrounding ground plane. In an optical surface tracking cursor control device embodiment, switching to and from a BEACON state, which provides a reduced flash rate of a surface illuminating light source, is carried out based upon a detected presence or absence of a trackable surface.
US Patent 7023425 Data input device power management including beacon state
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