Coil unit, and power transmission device and power reception device using the coil unit
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United States of America Patent
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Sep 18, 2012
Grant Date -
Sep 30, 2010
app pub date -
Mar 19, 2010
filing date -
Mar 26, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A coil unit includes a first coil having an outer diameter of D1, and at least one second coil having an outer diameter of D2 (D2<D1). The at least one second coil is arranged on a transmission surface side of the first coil. A part or whole of the at least one second coil overlaps the first coil, when viewed from the transmission surface side.
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