INDUCTIVE SENSOR Russian patent published in 1996 - IPC

FIELD: electrical engineering; inductive components on printed-circuit boards; sensors used for detecting objects made of magnetic or electricity-conducting material. SUBSTANCE: inductive sensor has planar inductive components deposited on printed-circuit board layers, groups of contact pads with intermediate metallized holes and is characterized in that inductive components on printed- circuit board layers are made in the form of double-entry spirals arranged on matrix lines and columns; contact pads of the first group are located inside each double-entry spiral and those of the second group, outside it; double-entry spirals of next layers are turned with respect to those of preceding layers through definite angle; positions of contact pads of the first group of preceding odd-numbered layer coincide with those of contact pads of the first group of next even-numbered layer; positions of contact pads of the second group of preceding even-numbered layer coincide with those of contact pads of the second group of next odd-numbered layer; the first contact pad of the second group of the first layer on printed-circuit board and the second contact pad of the second group of lat layer on printed circuit board functions as output terminals of inductive components. EFFECT: improved design. 2 cl, 12 dwg