| 摘要 |
In a focus-servo control method within an optical disc recording/reproducing apparatus, for recording or reproducing information onto/from an optical information recording medium having a track with a land and a groove, which are formed in a spiral manner on an information recording surface thereof, with moving an optical spot from the land to the groove, or from the groove to the land via an exchange portion therebetween, a focus offset value is exchanged from an offset value for the land or the groove to the offset value for the groove or the land, gradually. within a region starting from a position advancing by a predetermined time period from appearance of the exchange portion exchanging from the land to the groove or from the groove to the land, thereby providing a technology for dissolving fall down of recording/reproducing quality, due to the L/G exchange portion when recording/reproducing the information onto/from the optical disc having the land and the groove on the recording surface thereof.
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