| 摘要 |
In a recorder, a pit gain selection circuit (33) converts the amplitude corresponding to the pit length data into gain data and outputs the gain data to a pit recording signal generating circuit (39) through a timing regulation circuit (35). The generating circuit (39) selects the gain data corresponding to the pit signal length and converts it into an analog signal. A groove correction value selection circuit (41) converts the pit length data into a groove correction value and outputs it to a groove correction signal generating circuit (47) through a timing regulation circuit (45). The generating circuit (47) finds a groove signal correction value and converts it into an analog signal and outputs the analog signal to a subtracter (51). The subtracter (51) subtracts the analog signal sent from the generating circuit (47) from an analog signal from a D/A converter (49). The power corresponding to the power superposed upon a groove recording beam is cancelled only when a pit is cut by the side lobe of a pit recording beam. Thus, a recorder which enables production of an optical disc from which appropriate signals of the pits and grooves can be obtained at the time of reproduction even if physical high density recording is performed is provided.
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