Tracking control method, tracking control device, and optical disc device

A tracking control method for an optical pickup comprising an object lens for focusing laser light on an information recording surface of an optical disc, and a light receiving element that receives reflected light from the information recording surface of the optical disc and converts the light to an electric signal,

• the tracking control method comprising:
• a lens middle point control step of controlling a position of the object lens so as to suppress vibration of the object lens based on a signal obtained by feedback of a lens error signal generated from the electric signal;
• a tracking pull-in step of performing tracking pull-in processing to control a position of the object lens to follow a track of the optical disc;
• and
• a step of lowering a loop gain of the feedback of a lens middle point control in the lens middle point control step at a predetermined time before the tracking pull-in step is started,
• wherein the predetermined time is determined based on a time after the loop gain is lowered and before the object lens starts vibrating.

A tracking control device performing a tracking control for an optical pickup comprising an object lens for focusing laser light on an information recording surface of an optical disc, and a light receiving element that receives reflected light from the information recording surface of the optical disc and converts the light to an electric signal,

• the tracking control device comprising:
• a lens middle point control unit that controls a position of the object lens so as to suppress vibration of the object lens based on a signal obtained by feedback of a lens error signal generated from the electric signal;
• a tracking pull-in unit that performs tracking pull-in processing to control a position of the object lens to follow a track of the optical disc;
• and
• a loop gain control unit that lowers a loop gain of the feedback of a lens middle point control by the lens middle point control unit at a predetermined time before the tracking pull-in unit starts the tracking pull-in processing,
• wherein the predetermined time is determined based on a time after the loop gain is lowered and before the object lens starts vibrating.