Abstract: There provided an optical disk recording/reproducing method and an apparatus thereof capable of constantly forming an optimum mark region while appropriately correcting recording conditions. A sample hold circuit 6 detects and holds the level of a TPP signal to output a state monitoring signal. A reference level setting portion 8 holds the level of the state monitoring signal at which an optimum recording state is obtained and outputs a reference level signal. A recording state determining portion 7 outputs a record shortage signal and a record surplus signal based on the result of comparison between the reference level signal and the state monitoring signal. An LD output correcting portion 9 outputs an LD output correcting signal based on the record shortage signal and the record surplus signal as well as a record data signal.

Abstract: By shaping a waveform of a level of a push-pull (PP) signal that fluctuates in accordance with a high-frequency (HF) signal that indicates written data by comparing the level to space-side slice level and a mark-side slice level as a reference value, a space-side COMPARE signal and a mark-side COMPARE signal are obtained. Further, based on a level of the HF signal, a space-side ENABLE signal and a mark-side ENABLE signal are obtained, so that if the HF signal corresponds to a space region, the space-side COMPARE signal is selected by the space-side ENABLE signal and, if the HF signal corresponds to a mark region, the mark-side COMPARE signal is selected by the mark-side ENABLE signal. In such a manner, a mistake in detecting of the mark-side COMPARE signal owing to fluctuations of the HF d signal is prevented, to obtain an accurate LPP-detected signal.

Abstract: An optical disk recording/reproducing method and apparatus capable of constantly forming an optimum mark region while appropriately correcting recording conditions. A sample hold circuit detects and holds the level of a TPP signal to output a state monitoring signal. A reference level setting portion holds the level of the state monitoring signal at which an optimum recording state is obtained and outputs a reference level signal. A recording state determining portion outputs a record shortage signal and a record surplus signal based on the result of comparison between the reference level signal and the state monitoring signal. An LD output correcting portion outputs an LD output correcting signal based on the record shortage signal and the record surplus signal as well as a record data signal.

Abstract: A device for checking the recording state of a magneto-optical recording disk includes a detector for detecting a s-polarized light component and a p-polarized light component from a reflected light reflected from the portion of the magneto-optical recording disk. One of the s-polarized and p-polarized light components is subtracted from the other to produce a difference signal and the s-polarized and p-polarized light components are added to produce an addition signal. The difference signal is divided by the addition signal to produce a normalized detection signal. The recording state is determined based on a level change of the normalized detection signal while data is being recorded onto the magneto-optical recording disk.

Abstract: A development sensor apparatus includes an optical system, a 0th-order light detection unit, a 1st-order light detection unit, a diffracted light ratio calculating unit, and an ellipsoidal mirror. The optical system radiates a laser beam to a predetermined development monitor point on a pattern surface of a master having an exposed pattern. The 0th-order light detection unit receives a 0th-order diffracted light component from the development monitor point. The 1st-order light detection unit receives reflected light of a 1st-order diffracted light component from the development monitor point. The diffracted light ratio calculating unit calculates a ratio of diffracted light amounts of the 0th- and 1st-order diffracted light components based on detection signals of the 0th- and 1st-order light detection units and outputs a development monitor signal.