Optical system

An optical system, comprising:

• a light source used for generating light;
• a fixed portion;
• an optical assembly having an equivalent focal length to the light and comprising a first optical element and a second optical element;
• and
• a driving assembly used for driving the second optical element to move relative to the first optical element, comprising:
• a first driving element used for driving the second optical element to move relative to the first optical element in a first axis;
• and
• a second driving element used for driving the second optical element to move relative to the first optical element in a second axis;
• wherein:
• the first axis and the second axis are different;
• the first driving element comprises a shape memory alloy;
• the second driving element comprises a shape memory alloy;
• the first driving element comprises a first driving unit and a second driving unit;
• the second driving element comprises a third driving unit and a fourth driving unit;
• the second optical element comprises a first side, a second side, a third side, and a fourth side;
• the first side and the second side are adjacent;
• the second side and the third side are adjacent;
• the third side and the fourth side are adjacent;
• the fourth side and the first side are adjacent;
• the first driving element is disposed on the first side;
• the second driving element is disposed on the third side;
• the third driving element is disposed on the second side;
• the fourth driving element is disposed on the fourth side.