Optical reflective component and optical encoder using same

An optical encoder comprising:

• a rotating shaft comprising a second central axis, an outer edge and a datum plane, wherein the datum plane is perpendicular to the second central axis;
• an optical reflective component connected to the rotating shaft and comprising:
• a main body comprising a first central axis and a reflective surface, wherein the first central axis and the reflective surface are perpendicular to each other;
• an optical pattern disposed on the reflective surface, wherein the optical pattern is arranged around and centered at the first central axis of the main body;
• a first attaching portion centered at the first central axis of the main body and extending from the main body in a direction parallel to the first central axis of the main body, wherein the first attaching portion comprises an inner wall configured to connect with the outer edge of the rotating shaft, so that the first central axis of the main body is aligned to the second central axis of the rotating shaft;
• and
• a second attaching portion comprising a plane, wherein the plane is perpendicular to the first central axis of the main body and connected to the inner wall of the first attaching portion, wherein the second attaching portion is configured to match and align to the datum plane of the rotating shaft, wherein the main body, the first attaching portion and the second attaching portion are made of a metal material and integrally formed with the optical pattern;
• and
• an optical reading module spatially disposed and facing to the optical pattern on the reflective surface, wherein when the rotating shaft drives the optical reflective component to rotate, the optical pattern is read by the optical reading module.