Reflection Drive Assembly and Magnet Assembling Method Thereof

A reflection drive assembly, comprising:

• a reflection base;
• a carrier which is rotatably disposed on said reflection base for carrying a reflection element, wherein the reflection element is arranged to reflect light propagating in a direction parallel to a first axis to propagate in a direction parallel to a second axis;
• a reflection drive part comprising a second rotation magnet and a second rotation coil arranged opposite to each other, wherein said second rotation magnet and said second rotation coil are arranged to cooperate to drive said carrier to rotate with respect to said reflection base around a third axis, wherein the third axis is perpendicular to the first axis and the second axis;
• and
• a rotation position sensing part comprising a first sensing magnet and a first rotation sensing element arranged to detect a rotation angle of said carrier around the third axis, wherein said first sensing magnet and said second rotation magnet are arranged opposite to each other in a direction perpendicular to the third axis, wherein said first rotation sensing element is arranged to simultaneously sense magnetic fields of said first sensing magnet and said second rotation magnet.