Patent ID: 7944785

Claim:
A focus-servo control method of an optical disc recording/reproducing apparatus, for recording or reproducing information onto/from an optical disc having a track with a land and a groove, which are formed in a spiral manner on an information recording surface thereof, the optical disc recording/reproducing apparatus including an objective lens, the method comprising steps of: moving an optical spot from the land to the groove or from the groove to the land through a L/G exchange portion therebetween; moving a position of the objective lens from a land position to a groove position by gradually changing a focus offset value for the land to a focus offset value for the groove from a position located before the L/G exchange portion, when the optical spot moves from the land to the groove; and moving the position of the objective lens from the groove position to the land position by gradually changing the focus offset value for the groove to the focus offset value for the land from a position located before the L/G exchange portion, when the optical spot moves from the groove to the land.