Abstract: A magnetic encoder has a wiring structure which includes a retaining member 20 for retaining the magneto-sensitive element 37 in a certain positional relationship with respect to a surface on which a magnetic code is formed. This retaining member 20 is equipped with: a pair of gripping members 21c protruding toward the surface on which the magnetic code is formed; and an abutting member 21a adapted to abut against the back surface of the magneto-sensitive element 37 so as to keep the element 37 a certain distance apart from the surface on which the magnetic code is formed. The magneto-sensitive element 37, which is positioned by the abutting member 21a and the gripping members 21c, is fixed to the retaining member 20 by means of an adhesive agent or the like.

Abstract: Disclosed is a magnetic encoder comprising a rotational shaft on which a magnetic drum is provided, a first base provided with a bearing portion for rotatably supporting said rotational shaft, a second base mounted on said first base and provided with a sensor opposed to said magnetic drum, and a cap for covering said magnetic drum, said sensor and the like and having an open end edge secured to said first base.

Abstract: A magnetic rotary encoder which is reduced in overall size and production cost and wherein little torsional force around an axis of a rotary shaft is applied to a bearing for the rotary shaft from a force from an object member for detection and the detection sensitivity does not fluctuate even if the rotary shaft is yielded. The rotary shaft includes a fixed shaft fixedly supported at least at one portion thereof and having an inner race of the bearing secured to an outer periphery thereof, a cylindrical member having an outer race of the bearing secured to an inner periphery thereof, and a magnetic member provided on an outer periphery of the cylindrical member and having magnetic poles formed thereon. A magnetic sensor for detecting a magnetic flux from the magnetic member is supported on the fixed shaft by means of a mounting plate, and a detecting member is mounted in sliding contact with the cylindrical member and rotates, when it is rotated, the magnetic member around the axis of the rotary shaft.