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1. (WO2013118482) POWER TRANSMISSION COIL 


IPC:  H01F 38/14 H02J 17/00 

Applicants:  PANASONIC CORPORATION パナソニック株式会社 

Inventors:  WERNER, Steffen ヴェルナー シュテフェン IWAMIYA, Hiroki 岩宮 裕樹 MIYAKE, Eiji 三宅 英司 
Title:  POWER TRANSMISSION COIL 
Abstract: 
Provided is a power transmission coil that can suppress the effects when the dimensions of the coil bodies are incorrect, and the positions of both coils are offset. There are a first planar coil having an inner diameter (Di) and a second planar coil that is placed opposite the first planar coil and has an outer diameter (Do). The value of the outer diameter (Do) of the second planar coil divided by the inner diameter (Di) of the first planar coil is the outertoinner diameter ratio (Do/Di). The rate of change of the coupling coefficient between the first planar coil and the second planar coil is the rate of change (Δk) of the coupling coefficient. In the correlation relationship between the outertoinner diameter ratio (Do/Di) and the rate of change (Δk) of the coupling coefficient, the inner diameter (Di) of the first planar coil and the outer diameter (Do) of the second planar coil are determined to be less than the value of the outertoinner diameter ratio (Do/Di) when the gradient of the correlation relationship is rapidly increasing.
