Rotating body with marking for rotation measurement

A rotating body that is rotatable about a rotational axis, comprising:

• an outer surface including a measurement surface configured to reflect a measurement light received from an optical sensor, to produce a reflected light,
• wherein the measurement surface includes:
• a first measurement region configured to direct the reflected light in a reflection direction toward the optical sensor;
• and
• a second measurement region located adjacent to the first measurement region in a circumferential direction of the rotational axis and configured to pass through an irradiation position of the measurement light on the measurement surface for each revolution of the rotating body about the rotational axis, and
• wherein the second measurement region includes a marking configured to direct the reflected light, when the irradiation position is located in the second measurement region, in an additional direction different from the reflection direction of the reflected light, when the irradiation position is located in the first measurement region.

A rotating body that is rotatable about a rotational axis, comprising:

• an outer surface including a measurement surface configured to reflect a measurement light, to produce a reflected light,
• wherein the measurement surface includes a first measurement region and a second measurement region that are arranged in a circumferential direction of the rotational axis, and that are configured to alternatingly pass an irradiation position where the measurement light is reflected by the outer surface, during a rotation of the rotating body,
• wherein the first measurement region is configured to direct the reflected light from the irradiation position, in a first direction, and
• wherein the second measurement region includes a marking configured to direct at least a portion of the reflected light from the irradiation position, in a second direction that is different from the first direction.