Method and apparatus for detecting and compensating inclination of objective lens

An apparatus for detecting inclination of an objective lens comprising:

• an optical pick-up for reading a data recorded on the optical disk;
• a spindle motor for rotating the optical disk;
• a sled motor for moving the optical pick-up horizontally;
• a drive unit for driving the spindle motor and the sled motor;
• a detector for detecting a center error signal from an output signal of the optical pick-up;
• an RF unit for generating a servo error signal and a reproduction RF signal on the basis of the signal read by the optical pick-up;
• a digital signal processor for outputting a reproduction data according to the signal outputted from the RF unit, controlling the drive unit and outputting a synchronous signal;
• and
• a controller for judging whether the objective lens included in the optical pick-up has inclined according to the synchronous signal outputted from the digital signal processor and the center error signal outputted from the detector.

An apparatus for controlling an inclination of an objective lens comprising:

• an optical pickup to read data recorded in a disk, said optical pickup including the objective lens;
• a detection unit to detect a signal representing that a frame synchronous signal is normally detected and a center error signal representing a deviation from axial center generated from the optical pickup;
• and
• a controller to control the optical pickup to compensate the deviation from axial center based on the detected center error signal when the detected signal represents that the frame synchronous signal is abnormally detected.