Patent ID: 7049924

Claim:
An electromagnetic induction type position sensor comprising: AC magnetic flux generating means for generating an AC magnetic flux which repeatedly becomes strong and weak substantially at a wavelength λ in a movement direction of a position detection target; and a plurality of coils which receives the AC magnetic flux to output electromagnetic induction voltages different from each other in phase of an amplitude change, wherein each coil includes a plurality of conductive patterns formed in each of an even number of layers laminated via insulating materials, a shape of each conductive pattern is a sinusoidal shape at the wavelength λ extending in the movement direction of the position detection target, each conductive pattern pairs with the sinusoidal conductive pattern in a reverse phase formed at the same position in another layer, two or more conductive patterns of the plurality of conductive patterns constituting a same coil and formed in the same layer are adjacently arranged with a space between them in an amplitude direction of the sinusoidal shape, and all of the conductive patterns constituting a same coil are connected in series so that a direction of an electric current of these conductive patterns is opposite to that of the paired conductive patterns when viewed from a front of the layers.