Pickup Head Transmitting Mechanism of Disc Drive

A pickup head transmitting mechanism of a disc drive is provided. The pickup head transmitting mechanism has at least a guide rod, a thread rod, and a transmitting unit. The guide rod is utilized for supporting the pickup head of the disc drive. The thread rod is utilized for driving the pickup head along the guide rod. The transmitting unit is assembled between the pickup head and the thread rod and has a seat and a movable element. Wherein, the seat is fixed on the pickup head and has at least a sliding way extending toward the thread rod, and the movable element is slidably assembled in the sliding way and has a rack located on a surface thereof facing the thread rod. The rack is engaged with the thread rod.