Patent ID: 8399960

Claim:
A semiconductor device comprising: a first semiconductor chip having a first electromagnetic induction coil disposed thereon, a second semiconductor chip having a second electromagnetic induction coil disposed thereon, and a first circuit connected to both ends of said first electromagnetic induction coil and providing a closed loop, wherein said first circuit detects an induction signal induced by a change in a magnetic field signal which goes through said closed loop and is output from said second electromagnetic induction coil, and a signal is transmitted between said second semiconductor chip and said first semiconductor chip by way of electromagnetic induction between said first electromagnetic induction coil and said second electromagnetic induction coil, wherein said second electromagnetic induction coil is not disposed in a direction perpendicular to said first electromagnetic induction coil, wherein said second electromagnetic induction coil is of an isosceles triangular shape, and a direction of the bottom of said second electromagnetic induction coil is perpendicular to a direction in which said signal is transmitted, and wherein said second electromagnetic induction coil comprises a transmission coil having a vertex angle which satisfies a relationship in which a distance between said first electromagnetic induction coil and said second electromagnetic induction coil for transmitting the signal is of a value greater than the sum of the product of the tangent of half of the vertex angle of said second electromagnetic induction coil and half of the length of the bottom of said second electromagnetic induction coil and the product of the tangent of half of the vertex angle of said second electromagnetic induction coil and half of the length of a side of said first electromagnetic induction coil for receiving the signal which is closest to said first electromagnetic induction coil.