Patent ID: 7656259

Claim:
A magnetic encoder comprising: a printed circuit board, having a plurality of layers; a plurality of circuits, stacked with each other, each formed on one of the layers and each of the plurality of circuits comprising: a current input terminal; a current output terminal; and a connecting conductive line, connected between the current input terminal and the current output terminal, having a continuous meander pattern to separate a plurality of intervals continuously distributing, wherein the connecting conductive lines of the plurality of circuits are stacked with each other two conductive holes, penetrating the plurality of layers, one of the conductive holes directly and electrically connected to the current input terminals of the plurality of circuits, and the other of the conductive holes directly and electrically connected to the current output terminals of the plurality of circuits, such that the plurality of circuits on different layers are electrically connected into a single circuit; and a sensor, disposed above the printed circuit board corresponding to the continuous meander pattern, for detecting magnetic flux density of one of the plurality of magnetic fields induced; wherein each of the plurality of layers separating from two adjacent circuits is an insulating layer.