Patent ID: 7570550

Claim:
A focus servo recovery processing method for an optical disc device, comprising the steps of: retrying the focus servo at a radial position (R) of an occurrence of defocusing when defocusing occurs during recording on an optical disc by a CLV method; calculating a rotation frequency (A) of the optical disc at the radial position (R) when the focus servo cannot be applied at the retry; calculating a rotation frequency (B) at a position where the focus servo is retried after pickup return; calculating a rotation frequency (C) at a radial position (S) where recording is restarted after the focus servo is retried; calculating a rotation frequency (D) at a position where the focus servo is retried at a speed different from a speed at time of the recording after the pickup return; selecting a speed that provides a smallest rotation frequency difference from the rotation frequency (A) based on the rotation frequencies (A), (B), (C), and (D); applying the retry of the focus servo at the selected speed; and controlling a rotation frequency of the optical disc at the radial position (S) to become the rotation frequency (C) after the focus servo is retried.