Abstract: A contactless digital key switch is provided which comprises a plurality of printed circuit substrates each having a predetermined number of magnetic sensor chips longitudinally arranged thereon in spaced relation, the printed circuit substrates disposed in the form of polygon prism with the magnetic sensor chips facing inwardly, an actuating key member having one or more permanent magnets longitudinally arranged therein in spaced relation and in coded form, a rotary member adapted to receive the actuating key member and rotate with the same within the polygon prism defined by the printed circuit substrates, and means drivingly connected to the rotary member for permitting rotation of the rotary member with a snap action and holding the rotary member in a position where the permanent magnets face to the corresponding magnetic sensor chips on one of the printed circuit substrates every time the rotary member is rotated by a predetermined angle, whereby a coded signal corresponding to the permanent magnets arra

Abstract: A miniature contactless switching unit is disclosed for use in various kinds of position sensors with a magneto-electro converter. The miniature contactless switching unit includes a molded block case in which a permanent magnet and the magneto-electro converter are oppositely disposed, and a screening member for screening magnetism, which operates in accordance with the movement of a moving member, whereby when the moving member is in a first position, the screening member is not disposed between the magnet and the magneto-electro converter to hold the output of the converter in a first switching state, while when the moving member is in a second position, the screening member is disposed between the magnet and the converter so as to prevent the magnetic flux from said magnet to the converter to hold the output of the converter in a second switching state.