Absolute rotary encoder and apparatus

An apparatus comprising:

• a movable member configured to rotate;
• and
• an absolute rotary encoder configured to detect a rotation position of the movable member,
• wherein the absolute rotary encoder comprising:
• a scale on which a first track and a second track are provided with different diameters from each other;
• a first sensor configured to move relative to the scale and read the first track and the second track;
• a second sensor arranged so as to face the first sensor in a radial direction of the scale and configured to move relative to the scale and read the first track and the second track;
• and
• a processor configured to generate a first position signal by taking a difference between a first periodic signal based on a signal obtained by reading the first track by the first sensor and a second periodic signal based on a signal obtained by reading the second track by the first sensor, and generates a second position signal by taking a difference between a third periodic signal based on a signal obtained by reading the first track by the second sensor and a fourth periodic signal based on a signal obtained by reading the second track by the second sensor,
• wherein the processor averages the first position signal and the second position signal to generate a third position signal, combines the third position signal and the first periodic signal to generate a fourth position signal, combines the third position signal and the third periodic signal to generate a fifth position signal, and averages the fourth position signal and the fifth position signal to generate an absolute position signal indicating an absolute position of at least one of the scale, the first sensor, or the second sensor.