Electromagnetic induction type encoder

An electromagnetic induction type encoder comprising:

• a detection head that has a rectangular shape;
• and
• a scale that has a rectangular shape,
• wherein the detection head faces with the scale and is configured to relatively move with respect to the scale in a measurement axis direction,
• wherein the detection head has a drive coil configured to generate magnetic flux,
• wherein the scale has a plurality of connection coils that are arrayed in a fundamental period λ in the measurement axis direction, are configured to be electromagnetically coupled with the magnetic flux generated by the drive coil and generate magnetic flux that fluctuates in a predetermined spatial period in the measurement axis direction,
• wherein the detection head has a plurality of receiver coils that are arrayed in the fundamental period a, in the measurement axis direction and are configured to be electromagnetically coupled with the magnetic flux generated by the plurality of connection coils and detect a phase of the magnetic flux,
• wherein λ/2−2d<L<λ/2 is satisfied when a distance between a line width center and another line width center of the plurality of connection coils in the measurement axis direction is “L” and a line width of the plurality of connection coils is “d”.